SEIC


Line plots across dimensions of each concept
Line plots across concepts
Tables

Table of contents



us-gaap:CommonStockValue

us-gaap:CommonStockSharesIssued
us-gaap:StatementEquityComponents

us-gaap:CommonStockSharesOutstanding

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding

us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount

us-gaap:EarningsPerShareBasic

us-gaap:EarningsPerShareDiluted

us-gaap:AllocatedShareBasedCompensationExpense

us-gaap:ComprehensiveIncomeNetOfTax

us-gaap:CostsAndExpenses

us-gaap:GainLossOnInvestments
us-gaap:ConsolidationItems
us-gaap:GeneralAndAdministrativeExpense

us-gaap:GrossProfit
us-gaap:ConsolidationItems
us-gaap:StatementBusinessSegments

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest

us-gaap:IncomeTaxExpenseBenefit

us-gaap:InterestExpense

us-gaap:NetIncomeLoss
us-gaap:StatementEquityComponents

us-gaap:OperatingCostsAndExpenses
us-gaap:StatementBusinessSegments

us-gaap:OperatingIncomeLoss
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, us-gaap:EquityMethodInvestmentNonconsolidatedInvestee
us-gaap:ProfitLoss

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax

us-gaap:Revenues
us-gaap:ProductOrService
us-gaap:ProductOrService, us-gaap:StatementBusinessSegments
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, us-gaap:EquityMethodInvestmentNonconsolidatedInvestee
us-gaap:StatementBusinessSegments
us-gaap:StatementGeographical
us-gaap:StatementGeographical, us-gaap:StatementBusinessSegments

us-gaap:Assets
us-gaap:ConsolidationItems
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, us-gaap:EquityMethodInvestmentNonconsolidatedInvestee
us-gaap:StatementGeographical

us-gaap:Liabilities

us-gaap:LiabilitiesAndStockholdersEquity
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, us-gaap:EquityMethodInvestmentNonconsolidatedInvestee

us-gaap:StockholdersEquity
us-gaap:StatementEquityComponents

us-gaap:AssetsCurrent
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, us-gaap:EquityMethodInvestmentNonconsolidatedInvestee

us-gaap:CashAndCashEquivalentsAtCarryingValue
us-gaap:RestrictedCashAndCashEquivalentsCashAndCashEquivalents

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents

us-gaap:AccountsReceivableNetCurrent

us-gaap:OtherAssetsCurrent
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, us-gaap:EquityMethodInvestmentNonconsolidatedInvestee
us-gaap:AssetsNoncurrent

us-gaap:PropertyPlantAndEquipmentGross
us-gaap:PropertyPlantAndEquipmentByType

us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment

us-gaap:AmortizationOfIntangibleAssets

us-gaap:PropertyPlantAndEquipmentNet

us-gaap:InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures

us-gaap:Goodwill

us-gaap:IntangibleAssetsNetExcludingGoodwill

us-gaap:FiniteLivedIntangibleAssetsNet

us-gaap:OperatingLeaseRightOfUseAsset

us-gaap:OtherAssetsNoncurrent
us-gaap:FinancialInstrument
us-gaap:EquitySecuritiesFvNi

us-gaap:AccountsPayableCurrent

us-gaap:AccruedIncomeTaxesCurrent

us-gaap:AccruedLiabilitiesCurrent

us-gaap:ContractWithCustomerLiabilityCurrent

us-gaap:DividendsPayableCurrent

us-gaap:LiabilitiesCurrent
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, us-gaap:EquityMethodInvestmentNonconsolidatedInvestee

us-gaap:OperatingLeaseLiabilityCurrent

us-gaap:OtherAccruedLiabilitiesCurrent
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, us-gaap:EquityMethodInvestmentNonconsolidatedInvestee
us-gaap:LiabilitiesNoncurrent

us-gaap:DeferredIncomeTaxLiabilitiesNet

us-gaap:OtherLiabilitiesNoncurrent

us-gaap:OperatingLeaseLiabilityNoncurrent

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFive

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive

us-gaap:OperatingLeaseLiability

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDue

us-gaap:LesseeOperatingLeaseLiabilityUndiscountedExcessAmount

us-gaap:StockholdersEquity
us-gaap:StatementEquityComponents

us-gaap:CommonStockValue

us-gaap:AdditionalPaidInCapitalCommonStock

us-gaap:RetainedEarningsAccumulatedDeficit

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax

us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
us-gaap:StatementEquityComponents

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect

us-gaap:IncreaseDecreaseInAccountsPayable

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetIncomeLoss
us-gaap:StatementEquityComponents
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, us-gaap:EquityMethodInvestmentNonconsolidatedInvestee
us-gaap:ProfitLoss

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:PaymentsToAcquirePropertyPlantAndEquipment

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:PaymentsOfDividends

us-gaap:PaymentsForRepurchaseOfCommonStock
us-gaap:CreditFacility, us-gaap:DebtInstrument
us-gaap:DebtInstrumentInterestRateStatedPercentage
us-gaap:CreditFacility, us-gaap:DebtInstrument, us-gaap:SubsequentEventType

us-gaap:EffectiveIncomeTaxRateContinuingOperations

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
us-gaap:ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRange

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
us-gaap:ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRange

us-gaap:DeferredTaxLiabilities

us-gaap:DeferredTaxAssetsNet

us-gaap:UnrecognizedTaxBenefits
us-gaap:IncomeTaxAuthority
us-gaap:DeferredTaxAssetsValuationAllowance

seic:CapitalizedContractCostAmountCapitalizedDuringPeriod

seic:CapitalizedContractCostsNetOfAmortization

seic:CompensationBenefitsAndOtherPersonnel

seic:EffectiveIncomeTaxRateReconciliationExpirationOfTheStatuteOfLimitationsPercent

seic:EffectiveIncomeTaxRateReconciliationProvisionToReturnAdjustmentsPercent
us-gaap:CreditFacility, us-gaap:DebtInstrument
seic:LineOfCreditFacilityConditionalIncreaseDecreaseNet
us-gaap:CreditFacility, us-gaap:DebtInstrument, us-gaap:SubsequentEventType

seic:SoftwareRoyaltiesAndOtherInformationProcessingCosts

seic:SubadvisoryDistributionAndOtherAssetManagementCosts

us-gaap:AdjustmentForAmortization
us-gaap:ConsolidationItems
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities

us-gaap:AllocatedShareBasedCompensationExpenseNetOfTax

us-gaap:AmortizationOfDeferredCharges

us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfNetIncomePerOutstandingUnitAmount

us-gaap:CapitalExpendituresIncurredButNotYetPaid
us-gaap:ConsolidationItems
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:CapitalizedComputerSoftwareAdditions
us-gaap:FiniteLivedIntangibleAssetsByMajorClass
us-gaap:FiniteLivedIntangibleAssetsByMajorClass
us-gaap:CapitalizedComputerSoftwareAmortization1

us-gaap:CapitalizedContractCostAmortization
us-gaap:FinancialInstrument
us-gaap:DebtSecuritiesAvailableForSaleRealizedLoss

us-gaap:Depreciation
us-gaap:ConsolidationItems
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:DepreciationNonproduction

us-gaap:DividendsCommonStock
us-gaap:StatementEquityComponents

us-gaap:EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents

us-gaap:EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential

us-gaap:EffectiveIncomeTaxRateReconciliationOtherAdjustments

us-gaap:EffectiveIncomeTaxRateReconciliationShareBasedCompensationExcessTaxBenefitPercent

us-gaap:EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes

us-gaap:EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense

us-gaap:EquityMethodInvestmentDividendsOrDistributions
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

us-gaap:EquitySecuritiesFvNiRealizedGain

us-gaap:EquitySecuritiesFvNiRealizedLoss

us-gaap:IncomeLossFromEquityMethodInvestments
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

us-gaap:IncreaseDecreaseDueFromAffiliates

us-gaap:IncreaseDecreaseInAccruedLiabilities

us-gaap:IncreaseDecreaseInContractWithCustomerLiability

us-gaap:IncreaseDecreaseInDeferredIncomeTaxes

us-gaap:IncreaseDecreaseInOtherCurrentAssets

us-gaap:IncreaseDecreaseInOtherOperatingAssets

us-gaap:IncreaseDecreaseInOtherOperatingLiabilities

us-gaap:IncreaseDecreaseInOtherReceivables

us-gaap:IncreaseDecreaseInReceivables

us-gaap:InformationTechnologyAndDataProcessing

us-gaap:InvestmentIncomeInterestAndDividend
us-gaap:RelatedPartyTransactionsByRelatedParty
us-gaap:NonconsolidatedLegalEntityFinancialSupportAmount

us-gaap:OccupancyNet

us-gaap:OciBeforeReclassificationsNetOfTaxAttributableToParent
us-gaap:StatementEquityComponents

us-gaap:OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent

us-gaap:OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent

us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
us-gaap:StatementEquityComponents

us-gaap:OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax

us-gaap:OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax

us-gaap:OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax

us-gaap:OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax

us-gaap:OtherNoncashIncomeExpense

us-gaap:PaymentForContingentConsiderationLiabilityFinancingActivities
us-gaap:BusinessAcquisition

us-gaap:PaymentsForProceedsFromOtherInvestingActivities

us-gaap:PaymentsForSoftware

us-gaap:PaymentsToAcquireMarketableSecurities

us-gaap:ProceedsFromIssuanceOfCommonStock

us-gaap:ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities

us-gaap:ProceedsFromSaleAndMaturityOfMarketableSecurities

us-gaap:ProfessionalFees

us-gaap:ProvisionForDoubtfulAccounts

us-gaap:ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent
us-gaap:StatementEquityComponents

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue
us-gaap:StatementEquityComponents
us-gaap:StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans
us-gaap:StatementEquityComponents
us-gaap:StockIssuedDuringPeriodSharesStockOptionsExercised

us-gaap:StockIssuedDuringPeriodValueEmployeeStockPurchasePlan
us-gaap:StatementEquityComponents

us-gaap:StockIssuedDuringPeriodValueStockOptionsExercised
us-gaap:StatementEquityComponents
us-gaap:ShareRepurchaseProgram
us-gaap:StockRepurchasedAndRetiredDuringPeriodShares
us-gaap:StatementEquityComponents

us-gaap:StockRepurchasedAndRetiredDuringPeriodValue
us-gaap:StatementEquityComponents
us-gaap:ShareRepurchaseProgram
us-gaap:StockRepurchasedDuringPeriodValue
us-gaap:FinancialInstrument
us-gaap:UnrealizedGainLossOnInvestments

us-gaap:WeightedAverageNumberDilutedSharesOutstandingAdjustment

us-gaap:WeightedAverageNumberOfSharesIssuedBasic

seic:AccruedSubAdvisoryDistributionAndOtherAssetManagementFeesCurrent

seic:AccumulatedOtherComprehensiveIncomeLossDebtSecuritiesAvailableForSaleSecuritiesAdjustmentTax
us-gaap:BusinessAcquisition
seic:BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedContingentLiabilityCurrent
us-gaap:BusinessAcquisition
seic:BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedContingentLiabilityNoncurrent
us-gaap:FiniteLivedIntangibleAssetsByMajorClass
seic:CapitalizedSoftwareDevelopmentCostsInProgress

seic:DebtSecuritiesAvailableForSaleAndEquitySecuritiesFVNI

seic:DebtSecuritiesAvailableForSaleAndEquitySecuritiesFVNIAccumulatedGrossUnrealizedGainBeforeTax

seic:DebtSecuritiesAvailableForSaleAndEquitySecuritiesFVNIAccumulatedGrossUnrealizedLossBeforeTax

seic:DebtSecuritiesAvailableForSaleAndEquitySecuritiesFVNICost

seic:DeferredTaxLiabilitiesDeferredExpenseCapitalizedContractCost
us-gaap:FinancialInstrument
seic:EquitySecuritiesFVNIAccumulatedGrossUnrealizedGainBeforeTax
us-gaap:FinancialInstrument
seic:EquitySecuritiesFVNIAccumulatedGrossUnrealizedLossBeforeTax

seic:GrossLiabilityForUnrecognizedTaxBenefitsExclusiveOfInterestAndPenalties

seic:LesseeOperatingLeaseLiabilityToBePaidDueYearFiveAndThereafter

seic:ReceivablesGrossCurrent

seic:UnrecognizedTaxBenefitIncludingInterestAndPenalties

us-gaap:AccruedEmployeeBenefitsCurrent

us-gaap:AccruedIncomeTaxesNoncurrent

us-gaap:AccruedProfessionalFeesCurrent

us-gaap:AccruedSalariesCurrent

us-gaap:AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax

us-gaap:AllowanceForDoubtfulAccountsReceivableCurrent
us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:AlternativeInvestment

us-gaap:AssetsFairValueDisclosure
us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:FinancialInstrument
us-gaap:AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
us-gaap:FinancialInstrument
us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FinancialInstrument
us-gaap:AvailableForSaleSecuritiesDebtSecurities
us-gaap:FinancialInstrument

us-gaap:AvailableForSaleSecuritiesDebtSecuritiesNoncurrent

us-gaap:BilledContractReceivables
us-gaap:BusinessAcquisition
us-gaap:BusinessCombinationContingentConsiderationLiabilityCurrent
us-gaap:BusinessAcquisition
us-gaap:BusinessCombinationContingentConsiderationLiabilityNoncurrent

us-gaap:CapitalizedComputerSoftwareAccumulatedAmortization

us-gaap:CapitalizedComputerSoftwareNet
us-gaap:FiniteLivedIntangibleAssetsByMajorClass

us-gaap:CapitalizedContractCostNet

us-gaap:CashAndCashEquivalentsFairValueDisclosure
us-gaap:CashAndCashEquivalents

us-gaap:DeferredIncomeTaxAssetsNet

us-gaap:DeferredIncomeTaxLiabilities

us-gaap:DeferredTaxAssetsEquityMethodInvestments

us-gaap:DeferredTaxAssetsGross

us-gaap:DeferredTaxAssetsOperatingLossCarryforwardsForeign

us-gaap:DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal

us-gaap:DeferredTaxAssetsOther

us-gaap:DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation

us-gaap:DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost

us-gaap:DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsContingencies

us-gaap:DeferredTaxLiabilitiesDeferredExpenseCapitalizedSoftware

us-gaap:DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsGoodwill

us-gaap:DeferredTaxLiabilitiesOther

us-gaap:DeferredTaxLiabilitiesPrepaidExpenses

us-gaap:DeferredTaxLiabilitiesPropertyPlantAndEquipment

us-gaap:DividendsPayableCurrentAndNoncurrent

us-gaap:DueFromOtherRelatedPartiesCurrent

us-gaap:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName
us-gaap:EquityMethodInvestmentOwnershipPercentage
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, us-gaap:SubsequentEventType
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName
us-gaap:EquityMethodInvestments
us-gaap:FinancialInstrument
us-gaap:EquitySecuritiesFvNiCost

us-gaap:FinancialInstrumentsOwnedUSGovernmentAndAgencyObligationsAtFairValue
us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:FiniteLivedIntangibleAssetsAccumulatedAmortization

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths
us-gaap:FiniteLivedIntangibleAssetsByMajorClass

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearFive
us-gaap:FiniteLivedIntangibleAssetsByMajorClass

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearFour
us-gaap:FiniteLivedIntangibleAssetsByMajorClass

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearThree
us-gaap:FiniteLivedIntangibleAssetsByMajorClass

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo
us-gaap:FiniteLivedIntangibleAssetsByMajorClass

us-gaap:FiniteLivedIntangibleAssetsGross
us-gaap:FiniteLivedIntangibleAssetsByMajorClass
us-gaap:FinancialInstrument
us-gaap:InvestmentsFairValueDisclosure

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths

us-gaap:LettersOfCreditOutstandingAmount
us-gaap:DebtInstrument
us-gaap:DebtInstrument, us-gaap:SubsequentEventType

us-gaap:LiabilityForUncertainTaxPositionsCurrent

us-gaap:LiabilityForUncertainTaxPositionsNoncurrent
us-gaap:CreditFacility, us-gaap:DebtInstrument
us-gaap:LineOfCreditFacilityMaximumBorrowingCapacity
us-gaap:CreditFacility, us-gaap:DebtInstrument, us-gaap:SubsequentEventType
us-gaap:CreditFacility
us-gaap:LineOfCreditFacilityRemainingBorrowingCapacity
us-gaap:CreditFacility, us-gaap:DebtInstrument
us-gaap:CreditFacility, us-gaap:DebtInstrument, us-gaap:SubsequentEventType

us-gaap:OperatingLeaseWeightedAverageDiscountRatePercent

us-gaap:OtherLongTermInvestments
us-gaap:FinancialInstrument

us-gaap:OtherReceivablesGrossCurrent
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, us-gaap:EquityMethodInvestmentNonconsolidatedInvestee
us-gaap:PartnersCapital

us-gaap:RestrictedCashAndCashEquivalentsAtCarryingValue
us-gaap:RestrictedCashAndCashEquivalentsCashAndCashEquivalents

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber
us-gaap:ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRange

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice
us-gaap:ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRange

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue

us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1

us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfShares
us-gaap:ReasonablyPossibleSignificantChangeInUnrecognizedTaxBenefitsByItem
us-gaap:SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleAmountOfUnrecordedBenefit
us-gaap:ShareRepurchaseProgram
us-gaap:StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1
us-gaap:ShareRepurchaseProgram, us-gaap:SubsequentEventType

us-gaap:UnbilledContractsReceivable

us-gaap:UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued

us-gaap:UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate
us-gaap:ValuationAllowancesAndReservesType
us-gaap:ValuationAllowancesAndReservesBalance

Plots across concepts


IncomeStatement
Net Income Loss
Expenses
Interest Expense
Balance Sheet
Intangible Assets Net Excluding Goodwill
Assets
Operating Lease Right Of Use Asset
Current Assets
Other Assets Current
NonCurrent Assets
Deferred Income Tax Assets Net
PropertyPlantAndEquipmentNet
Property Plant And Equipment Net
Liabilities
Operating Lease Liability
Current Liabilities
Contract With Customer Liability Current
Stockholders Equity
Accumulated Other Comprehensive Income Loss Net Of Tax
CashFlow
Net Cash Provided By Used In Financing Activities
NetCashProvidedByUsedInOperatingActivities
Increase Decrease In Accounts Payable
NetCashProvidedByUsedInInvestingActivities
Net Cash Provided By Used In Investing Activities
NetCashProvidedByUsedInFinancingActivities
Net Cash Provided By Used In Financing Activities
Shares
Common Stock Shares Issued
DividendsAndRepurchase
Dividends Payable Current And Noncurrent
OperatingLeaseLiability
Operating Lease Liability Current
LesseeOperatingLeaseLiabilityPaymentsDue
Lessee Operating Lease Liability Undiscounted Excess Amount
FiniteLivedIntangibleAssets
Finite Lived Intangible Assets Accumulated Amortization
AccountsReceivable
Allowance For Doubtful Accounts Receivable Current

Tables

  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:CommonStockValue ▁▁▁▂▂▂▂▂▃▃▃▃▃▄▃▄▄▄▄▄▄▄▅▅▅▅▅▅▅▅▅▆▆▆▆▆▆▆▇▇███1.411.4271.4341.4451.4641.4791.4971.5021.5091.5231.5361.5551.5681.581.5711.5741.581.5871.591.61.6121.6191.6371.6461.6591.6611.6671.6711.6771.6911.6921.7051.7151.7231.7221.7291.7341.7551.7651.7961.8321.8511.861NANANA
us-gaap:CommonStockSharesIssued ▁▁▁▂▂▂▂▂▃▃▃▃▃▄▃▄▄▄▄▄▄▄▅▅▅▅▅▅▅▅▅▆▆▆▆▆▆▆▇▇███141.027142.701143.396144.491146.445147.903149.745150.222150.955152.276153.634155.475156.8157.99157.069157.405157.986158.687159.031159.954161.191161.908163.733164.598165.86166.071166.688167.112167.683169.071169.242170.5171.516172.342172.22172.868173.374175.469176.506179.611183.175185.059186.141NANANA
us-gaap:CommonStockSharesOutstanding ▁▁▁▂▂▂▂▂▃▃▃▃▃▄▃▄▄▄▄▄▄▄▅▅▅▅▅▅▅▅▅▆▆▆▆▆▆▆▇▇███141.027142.701143.396144.491146.445147.903149.745150.222150.955152.276153.634155.475156.8157.99157.069157.405157.986158.687159.031159.954161.191161.908163.733164.598165.86166.071166.668167.112167.683169.071169.242170.5171.516172.342172.22172.868173.374175.469176.506179.611183.175185.059186.141NANANA
us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding ▁█144.212145.306NA147.907149.598152.368NA154.227155.165156.541NA160.511162.225163.424NA161.148161.709162.742NA163.925165.088166.145NA169.255169.973170.703NA172.905172.304173.828NA176.043176.058176.005NA175.369175.913NANANANANANANANANA
us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount ▁█11.5311.715NA8.8138.1547.408NA6.2396.2446.323NA6.1836.2216.054NA11.32411.25511.279NA10.25810.38810.506NA9.93810.00710.051NA4.4115.3974.389NA3.0425.5486.863NA9.55216.63714.329NA16.297.6757.609NA9.8110.422NA
us-gaap:EarningsPerShareBasic ██▇▆▅▆▇▇▇▆▆▇▆▇▆▅▄▄▄▄▄▃▃▃▄▄▃▄▃▃▂▂▃▃▂▁▁▁▁▁▁▂▂▂▁▂0.940.90.870.760.690.730.860.880.830.740.750.820.770.890.780.640.580.560.550.540.50.480.490.480.520.510.460.50.490.440.390.390.480.420.330.290.280.280.250.270.290.310.330.30.280.31
us-gaap:EarningsPerShareDiluted ██▇▆▅▆▇▇▇▆▆▇▆▇▆▅▄▄▄▄▃▃▃▃▄▄▃▃▃▃▂▂▃▃▂▁▁▁▁▁▁▂▂▂▁▂0.930.890.860.750.680.720.840.860.820.730.730.80.750.860.750.630.570.550.550.530.490.470.480.470.510.50.450.490.480.430.370.380.470.410.320.290.280.280.250.270.290.310.330.30.280.31
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
 Gross Margin us-gaap:StatementBusinessSegments seic:InstitutionalInvestors▇▇▇▆▆▆▆▆▆▆▆▇▇▇█▆▆▆█▆▅▅▅▅▅▅▅▅▄▄▄▃▃▃▂▂▂▁85.69984.49982.31879.58376.52379.20380.50380.33781.10980.11380.90883.46683.43485.49186.97480.41178.06877.00488.79176.22274.67472.89773.52574.51575.9873.54872.46672.5670.99468.65767.27363.53963.68463.16260.59658.08155.89553.317NANANANANANANANA
 Gross Margin us-gaap:StatementBusinessSegments seic:InvestmentAdvisors█▇▇▆▅▆▇▆▆▆▆▆▆▆▆▅▅▅▅▅▄▄▄▄▄▃▃▄▃▃▃▂▂▂▁▁▁▁119.396113.294108.346103.18993.708102.321105.862103.033100.12294.76197.457102.5599.8999.19298.17194.31892.74688.23886.85785.25881.88376.67978.61476.23877.75374.01572.87274.46970.04666.42465.38461.39359.28455.19152.47651.38449.37549.468NANANANANANANANA
 Gross Margin us-gaap:StatementBusinessSegments seic:InvestmentManagers██▇▇▆▆▆▆▆▅▅▅▅▅▄▄▄▃▃▃▃▃▃▃▃▂▂▂▂▂▂▂▂▂▁▁▁▁142.808136.419129.647123.846119.34116.629114.759112.186109.202104.649102.38101.27597.56696.85594.32191.0283.61680.48777.86275.67270.93869.91868.15467.16267.2865.36764.21163.6462.45161.00859.53957.26655.45653.8251.24949.31146.71346.211NANANANANANANANA
 Gross Margin us-gaap:StatementBusinessSegments seic:PrivateBank▇▆▇▆▅▆▇▆▆▆▇▆▇▇█▆▆▅▆▆▆▆▆▆▆▅▅▅▆▄▄▃▂▃▃▂▁▁123.676117.608119.654114.792107.726113.221118.675117.25116.092118.259121.358118.449121.126122.164126.955118.499116.184112.634113.737115.952114.836113.361113.69116.28115.333111.213111.959110.147114.182105.179105.8897.3795.14298.74696.42192.07688.30387.988NANANANANANANANA
 Net profit Margin us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName,us-gaap:EquityMethodInvestmentNonconsolidatedInvestee seic:LSVAssetManagement,us-gaap:EquityMethodInvestmentNonconsolidatedInvesteeOrGroupOfInvestees▆▅▃▁▁▂█▇▇116.392110.837102.10294.90294.64899.996126.536121.232123.017NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
 TTM Greenblatt ROC _ _██▇▆▅▆▆▇▇▆▅▆▆▆▆▅▅▅▅▅▅▄▄▄▅▅▅▅▅▄▃▂▂▂▂▂▂▁▁▂▂▂▂136.021132.837124.01111.337100.312110.228116.09120.637120.136103.561102.962112.42110.29116.316106.96399.23797.22793.51798.14197.21893.52386.81282.20787.01895.91893.0790.26490.49893.6378.39268.45561.93957.97360.04256.18953.4953.79848.08944.37551.13653.95754.59751.877NANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:AllocatedShareBasedCompensationExpense ▅▄▃▃▃▃▄▂▂▂▃▃▂▂█▃▃▃▂▂▂▁▃▂▂▁▂▁▁▁▅▅▅▂▂▂▂▂▁▁▁▁▅▁▃▃10.1039.7526.5566.4677.0626.9299.0275.4535.0645.0387.4095.8785.3235.19516.8397.0886.2596.183.9734.0664.1893.7895.8363.8673.8593.753.9823.7862.8722.82310.86811.09710.6075.2933.9593.8793.8654.0333.1463.4243.813.73210.383.4686.2786.657
us-gaap:ComprehensiveIncomeNetOfTax ▇▆▇▄▂▁█▆▅134.659130.865136.482117.877102.23597.398141.013127.128124.52NANANANANANANANANANANANANANANANANA71.19777.16786.6273.34765.44670.7580.21266.96457.13154.29947.60152.15645.90942.57755.35359.86362.88160.58650.38859.731
us-gaap:CostsAndExpenses █▇▇▇▆▆▇▆▆▆▆▆▆▆▆▆▅▅▅▄▄▄▄▄▄▃▃▃▃▃▃▃▃▂▂▂▁▁▁▁339.63322.849319.713313.59300.334304.534307.135295.617289.45297.259302.095296.262294.54289.282301.256286.781275.104266.467270.669257.423250.308247.451253.19248.604241.827232.374232.493231.549225.185223.994230.569218.716216.601211.837205.446198.262187.439189.809181.872182.091NANANANANANA
us-gaap:GainLossOnInvestments ▂▂▃▃▃▁▃▂▂▃▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▄▃▂▃▂▂▂▅█▅▃█0.3770.3321.0240.7761.903-3.9891.0530.6110.2311.2790.1350.089-0.139-0.410.2330.6450.0440.347-0.2080.1960.25-0.1260.088-0.756-0.0380.250.565-0.4780.3910.1360.0210.535-0.1770.286.493.7080.6643.205-0.552-1.418-1.9487.27818.0989.3623.59417.479
 us-gaap:GeneralAndAdministrativeExpense us-gaap:ConsolidationItems us-gaap:CorporateNonSegment█▁22.32221.516NA18.0417.39117.983NA16.23716.57320.03519.24814.94216.51414.94218.00415.49315.73214.60516.47715.94113.85213.04715.46512.85612.77113.35912.57612.9911.62411.69913.01414.40212.52313.794NANANANANANANANANANANANA
us-gaap:GrossProfit ██▇▆▅▆▆▆▆▅▅▆▅▆▅▅▄▄▅▄▄▃▃▃▄▄▄▄▄▃▂▁▁▁158.343154.353144.594129.377117.703128.211135.441136.874136.709123.596122.21127.362126.804131.258124.967114.73112.959108.122114.618113.159107.37599.85997.67299.874108.689106.429102.84103.488105.25490.09181.46976.34170.49673.547NANA64.73958.856NANANANANANANANA
us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest ██▇▆▅▆▇▇▇▆▆▇▇▇▇▆▅▅▅▅▅▄▄▅▅▅▄▅▅▄▃▃▅▄▂▂▂▂▁▁▂▃172.211167.341156.513141.274131.71139.197159.968162.87162.346146.257143.599157.595154.254158.758152.452140.769135.158128.66133.053130.89124.904119.638115.082120.588133.81131.0115.525128.618128.854116.665101.06393.986129.387110.96287.54483.50178.50179.9568.60374.982.8292.164NANANANA
us-gaap:IncomeTaxExpenseBenefit ▆▆▄▄▄▄▄▄▅▄▃▄▄▁▄▆▇▆▇▇▇▇▅▆██▆▇█▇▅▃█▆▄▄▃▄▂▃▃▅▅▅▄▅38.43337.87130.63130.17830.64429.95531.23130.70235.80632.27627.56529.27632.57718.9230.30839.0343.38939.92344.44244.18643.89942.14133.70341.16347.5746.38938.42844.63546.04141.84535.54826.79145.89338.69230.5732.41528.76229.71523.7525.25628.70734.12433.27834.31132.60336.269
us-gaap:InterestExpense ▂▁▂▂▂▂▂▂▂▂▂▁▂▄▃▆▁▁▁▁▃▁▂▁▁▁▁▁▁▁▁▃▁▁▁▁▁▂▁▁▂▃▄▅▇█0.130.1230.1530.1530.1510.1520.1530.1540.1660.1570.1340.1220.1320.2570.210.3450.1140.1120.1150.1150.1870.1140.1410.1150.1140.1130.1160.1150.1140.1130.1130.1950.1140.1130.1150.1150.1130.1610.10.1260.1550.2040.2560.3360.4150.471
us-gaap:NetIncomeLoss ▇▆▅▃▁▂▆▇▆▃▄▆▅█133.778129.47125.882111.096101.066109.242128.737132.168126.54113.981116.034128.319121.677139.838NANANANANANANANA81.37979.42586.2484.61177.09783.98382.81374.8265.51567.19583.49471.9256.58550.74349.55549.96544.39649.23253.60357.72862.456.38953.47859.42
us-gaap:OperatingCostsAndExpenses █▇▇▇▇▇▇▆▆▆▇▆▆▆▇▆▅▅▅▅▄▄▅▄▄▄▄▄▄▃▄▃▃▃▃▂▂▂▂▂▂▂▂▁▁317.308301.333299.129295.55282.943286.551287.784279.38272.877277.224282.847281.32278.026274.34283.252271.288259.372251.862254.192241.482236.456234.404237.725235.748229.056219.015219.917218.559213.561212.295217.555204.314204.078198.332193.835186.797176.498179.042171.439171.309173.616167.52167.955155.672161.643NA
us-gaap:OperatingIncomeLoss ██▇▆▅▆▆▇▇▆▅▆▆▆▆▅▅▅▅▅▅▄▄▄▅▅▅▅▅▄▃▂▂▂▂▂▂▁▁▂▂▂▂▂▂▂136.021132.837124.01111.337100.312110.228116.09120.637120.136103.561102.962112.42110.29116.316106.96399.23797.22793.51798.14197.21893.52386.81282.20787.01895.91893.0790.26490.49893.6378.39268.45561.93957.97360.04256.18953.4953.79848.08944.37551.13653.95754.59751.87755.13957.17253.345
 us-gaap:ProfitLoss us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName,us-gaap:EquityMethodInvestmentNonconsolidatedInvestee seic:LSVAssetManagement,us-gaap:EquityMethodInvestmentNonconsolidatedInvesteeOrGroupOfInvestees▆▅▄▁▂▂█▇▇90.5285.9281.43670.4472.84776.897100.61596.69997.271NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax █▇▇▇▆▆▇▆▆▆▆▆▆▆▆▆▅▅▅▅▄▄▄▄▄▄▄▄▄▃▃▃▃▂▂▂▂▂▁▁▁▁▁▁▁▁475.651455.686443.723424.927400.646414.762423.225416.254409.586400.82405.057408.682404.83405.598408.219386.018372.331359.984368.81354.641343.831334.263335.397335.622337.745325.444322.757322.047318.815302.386299.024280.655274.574271.879261.635251.752241.237237.898226.247233.227237.76232.493231.399219.513228.388221.535
us-gaap:Revenues █▇▇▇▆▆▇▆▆▆▆▆▆▆▆▆▅▅▅▅▄▄▄▄▄▄▄▄▄▃▃▃▃▂▂▂▂▂▁▁▁▁▁▁▁▁475.651455.686443.723424.927400.646414.762423.225416.254409.586400.82405.057408.682404.83405.598408.219386.018372.331359.984368.81354.641343.831334.263335.397335.622337.745325.444322.757322.047318.815302.386299.024280.655274.574271.879261.635251.752241.237237.898226.247233.227237.76232.493231.399219.513228.388221.535
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:Assets ███▇▇▇█▇▆▆▆▆▆▆▆▅▄▄▄▃▃▃▄▃▃▃▃▃▂▂▂▂▂▂▁▂▁▁▁▁▂▂▂2139.692150.9012167.2562085.6172053.62058.0312151.372040.6051952.7991953.1211971.6681939.3281890.7061893.7051853.3691751.3971634.0891624.5521636.8231573.5661520.3711550.8461588.6281543.5291525.8321521.9851542.8751485.7791435.1061438.9811439.1691391.6991347.8681342.611309.8241332.4041264.8621293.6261294.5591303.7071330.8051378.0351377.223NANANA
us-gaap:Liabilities ▅▅█▆▅▅█▅▅▄▆▄▄▃▆▅▃▃▅▃▂▂▄▂▁▂▄▂▂▂▃▂▁▂▂▂▁▁▂▂▂▃▅334.084321.793427.349356.184344.975323.765412.592337.298318.298316.571378.521308.818299.824280.051376.53318.856262.354261.759333.709260.356232.088250.381298.908233.765219.85237.726295.262241.139231.764234.609283.167225.132221.373241.513252.495233.327207.834222.186253.1234.827243.743285.079320.498NANANA
us-gaap:LiabilitiesAndStockholdersEquity ███▇▇▇█▇▆▆▆▆▆▆▆▅▄▄▄▃▃▃▄▃▃▃▃▃▂▂▂▂▂▂▁▂▁▁▁▁▂▂▂2139.692150.9012167.2562085.6172053.62058.0312151.372040.6051952.7991953.1211971.6681939.3281890.7061893.7051853.3691751.3971634.0891624.5521636.8231573.5661520.3711550.8461588.6281543.5291525.8321521.9851542.8751485.7791435.1061438.9811439.1691391.6991347.8681342.611309.8241332.4041264.8621293.6261294.5591303.7071330.8051378.0351377.223NANANA
us-gaap:StockholdersEquity ▇█▅▅▄▅▅▄▂▂▁▂▁1805.6061829.1081739.9071729.4331708.6251734.2661738.7781703.3071634.5011636.551593.1471630.511590.882NA1476.839NANANANANANANANANANANANANANANA1156.0021166.5671126.4951101.0971038.181081.3041040.1021054.5441025.3161053.591070.161077.0691041.57NANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:AssetsCurrent ████▇▇█▇▆▆▇▇▆▇▆▆▅▅▅▅▄▅▅▅▄▄▄▄▃▃▃▃▃▂▂▂▁▁▁▁▂▂▂1311.3561324.8511300.9771274.9081232.8991233.151304.8451240.1371137.5411127.6081190.8121193.5511130.1971171.3071139.8081064.9761028.8211019.7751037.833976.768940.92975.0371003.724967.827940.587942.964955.427883.376832.109842.633847.1800.032753.376747.548701.404670.479595.41617.339634.951638.446665.133702.747683.719NANANA
us-gaap:CashAndCashEquivalentsAtCarryingValue ▇▇▇▇▇▇█▇▆▆▇▇▆▇▇▆▅▅▆▅▅▅▆▅▅▅▆▄▄▄▄▄▃▂▂▂▁▂▂▂▂▃▃▂▃▃780.928782.582784.626767.698758.276746.87841.446767.809682.266669.323754.525741.965693.442748.299744.247684.971660.362661.372695.701623.162594.767638.253679.661647.589624.841643.26667.446577.914532.167545.552578.273527.214487.059452.099452.247397.677347.494388.127420.986428.865442.311498.039496.292451.778461.929500.661
us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents ▆▆▆▅▅▄█▅▂▁▅▄▂▄▄▂▁▁▂781.279785.683787.727770.799761.377749.971844.547770.909685.786672.84758.039745.476696.951751.806747.752688.474663.864664.872699.201NANANA685.161NANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:AccountsReceivableNetCurrent ██▆▅▂▃▁409.568406.028385.219378.17351.614358.13340.358NANANA315.336NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:OtherAssetsCurrent ▇█▇▇▆█▅▆▅▆▆▇▆▆▅▅▅▅▄▅▅▄▄▄▃▃▂▂▂▂▁▂▁▂▂▂▁▂▁▁▁▁▁38.15842.80938.69638.47535.00542.01732.28934.89431.91535.04936.67637.11336.24834.72231.15830.53731.95329.87327.57530.27930.21328.82926.20729.20622.84625.02818.19321.02821.55819.43216.16619.34517.79320.60318.23918.8217.8119.64417.95717.54416.47917.47816.268NANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
 us-gaap:AssetsNoncurrent us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName,us-gaap:EquityMethodInvestmentNonconsolidatedInvestee seic:LSVAssetManagement,us-gaap:EquityMethodInvestmentNonconsolidatedInvesteeOrGroupOfInvestees▁▂▄▆█4.0234.0984.2964.4844.625NA5.048NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:PropertyPlantAndEquipmentGross ███▇▇▇▆▆▆▆▆▅▅▅▅▅▄▄▄▄▄▄▃▃▃▃▂▂▂▂▂▂▁▁▁▁▁▁▁▁▁578.785570.572567.691550.603549.95533.403514.312500.961502.338491.882484.069477.003468.322462.525456.383451.007443.831434.226431.512427.937410.988407.812403.478401.135381.736372.736366.83364.381357.584346.636339.059333.147328.256328.362328.999327.559326.987322.941312.001315.16314.322NA307.384NANANA
us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment ███▇▇▇▇▇▇▆▆▆▆▆▅▅▅▅▅▄▄▄▄▄▄▃▃▃▃▃▃▂▂▂▂▂▂▂▁▁▁▁▁394.743386.319378.639370.072367.677360.148353.453346.377352.293345.129338.206331.138323.992317.245309.955302.901298.294291.5285.322278.675272.292266.022259.501258.783253.039246.881241.295235.606230.899225.597220.064214.653209.061205.209201.418195.67191.976186.51182.453182.045177.779172.494166.816NANANA
us-gaap:AmortizationOfIntangibleAssets ▄▄▄▄▄▄▄▄▄▄▄▄▁▇▇██▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▆▆0.9210.9210.920.9210.9210.9210.920.9210.9210.9210.9210.921-10.15811.8549.94313.74512.56512.02211.70811.38811.28411.01210.82410.83710.61110.35810.0689.8139.5849.2149.1048.8298.4278.242NANANANANANANANANANANANA
us-gaap:PropertyPlantAndEquipmentNet ███▇▇▆▅▅▄▄▄▄▄▄▄▄▄▃▄▄▃▃▄▃▂▂▂▂▂▁▁▁▁▁▂▂▃▃▂▂▃▃▃184.042184.253189.052180.531182.273173.255160.859154.584150.045146.753145.863145.865144.33145.28146.428148.106145.537142.726146.19149.262138.696141.79143.977142.352128.697125.855125.535128.775126.685121.039118.995118.494119.195123.153127.581131.889135.011136.431129.548133.115136.543142.333140.568NANANA
us-gaap:InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures ▁▁▁▁▁▁▁▄▅▆▅▅▅▆▆▄▅▅▅▄▄▅▅▄▅▅▆▆▆▆▆▆███▆▆▇▆▇▇▇▆6.9326.6236.1665.2074.7493.7535.98841.43750.20356.42252.34244.68251.8154.48259.49242.22545.19748.75950.45939.37641.99644.24749.5842.29450.76551.3254.2963.85860.01761.75661.3757.42981.77777.16577.39863.61863.55366.69160.95467.99472.43969.23764.409NANANA
us-gaap:Goodwill █████████████▁▁64.48964.48964.48964.48964.48964.48964.48964.48964.48964.48964.48964.48965.24952.9952.99NANANA0.0NANANANANANANANANANANANANANANANANANANANANANANA0.0NANANA
us-gaap:IntangibleAssetsNetExcludingGoodwill ▇█▁▂▂▃▄▄▅▅▆▇█▃▄33.18734.38324.30425.22526.14527.06627.98728.90729.82830.74931.6732.59133.85227.80228.578NANANA0.0NANANANANANANANANANANANANANANANANANANANANANANA0.0NANANA
us-gaap:FiniteLivedIntangibleAssetsNet NANA24.304NANANA27.987NANANA31.6732.591NANA28.578NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:OperatingLeaseRightOfUseAsset ▁▂▂▃▃▅▆▄▆█36.87137.76238.39738.94539.07641.38342.78941.05442.9445.297NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:OtherAssetsNoncurrent ▇▆▇▇█▇▆▇▇▇▇▇▇▃▃▃▃▂▂▂▂▂▂▃▃▂▂▂▂▂▁▁▁▁▂▄▄▄▄▄▂▂▂33.08231.72432.28932.50737.72233.30230.20232.10933.76132.88234.15533.64233.81518.33418.88417.04516.65316.2415.45616.06413.85614.07215.49217.08217.10616.44216.45113.4113.32814.11310.91711.51110.70711.24414.17323.52823.58221.26120.6421.45515.87416.32814.831NANANA
 us-gaap:EquitySecuritiesFvNi us-gaap:FinancialInstrument seic:EquitiesAndOtherMutualFunds█▇▇▅▄▁▅▄▃▃▁5.1695.0374.8944.5144.2023.6514.4694.1424.1113.9893.56NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:EquitySecuritiesFvNi us-gaap:FinancialInstrument seic:SEISponsoredMutualFunds█▆▆▂▄▁█▅▆▅▃7.5627.3187.2486.5796.9926.3827.657.1717.2317.1226.658NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:AccountsPayableCurrent ▅▃▄▆▅▆▂▄▃▃▅▅▄▄▃▂▃▄▃▄▂▂▂▂▃▃▅▃▄▄█▄▁▃▆▂▂▁▁▃▂▁▂9.2915.5297.76613.03810.7813.0864.4238.7125.4945.24210.929.1617.5198.4635.2684.4295.4077.3725.9667.0083.5414.3544.5114.0026.1396.0510.5886.5128.478.37316.2357.2751.8026.61711.2483.5673.852.2411.9996.9042.8552.7414.582NANANA
us-gaap:AccruedIncomeTaxesCurrent NA33.0013.507NA24.73923.6632.01NANA28.4646.55911.16414.38719.2825.583NANA36.5243.7219.39NA38.4923.5058.9083.83538.6643.272NANANANA0.02618.43738.8370.104NANA18.0740.00.00.0NA2.077NANANA
us-gaap:AccruedLiabilitiesCurrent ▅▄█▅▅▄▇▄▄▄▇▅▄▃▇▄▃▃▆▃▃▃▅▃▂▃▅▃▂▂▄▂▂▂▂▂▁▂▃▁▁▂▂211.984199.235299.845223.217210.711179.772272.801193.919178.473173.86279.634207.675193.832168.618265.058185.368170.577167.061240.525170.753145.717165.005217.587153.28131.746152.227207.429148.839138.022141.664188.123136.639128.131140.61138.305121.849100.902115.408147.044104.96101.335121.239121.41NANANA
us-gaap:ContractWithCustomerLiabilityCurrent ▁▁▁▆▇▇█▆▅▅▆▆▆1.281.3351.0855.8156.3495.9787.1855.5294.7054.9795.1545.0545.587NA4.723NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:DividendsPayableCurrent NANA53.127NA0.00.052.4520.00.00.050.7610.00.00.047.1790.00.00.044.5960.00.00.042.6250.00.00.040.1780.00.00.037.314NANANA0.00.00.00.026.518NANANA0.0NANANA
us-gaap:LiabilitiesCurrent ▅▅█▆▅▄▇▅▄▄▇▅▄▄▇▄▃▃▆▄▃▃▅▃▂▃▅▃▂▃▄▂▂▂▃▂▁▁▃▂▁▂▂232.899215.912317.275250.515236.125207.551293.565216.048196.931192.529295.708221.89206.938182.079275.049192.931178.793176.77249.371180.735152.737172.295224.483161.915144.309163.193221.18158.317149.677153.719207.988145.278131.247148.727152.005126.535105.383118.877151.073132.973104.551125.066127.6NANANA
us-gaap:OperatingLeaseLiabilityCurrent █▆▃▃▂▃▅▁▂▃10.3449.8138.5798.4458.2858.7159.1567.8888.2598.448NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:OtherAccruedLiabilitiesCurrent ▄▄▇▆▇▅▆▆▆▄█▇▆▆█▇▇▅▇▄▄▅▆▂▁▃▄▂▃▃▂▁▁▁▂▂▂▂▂▂▂35.46535.39250.46148.27851.56741.66848.50346.93646.51937.92457.68750.36646.57345.2656.89653.93750.3140.45350.136.82836.09542.81446.02623.90419.06927.56436.67226.99231.19531.18122.32621.7520.64121.32727.05325.06422.72225.77523.77322.21823.221NA23.488NANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
 us-gaap:LiabilitiesNoncurrent us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName,us-gaap:EquityMethodInvestmentNonconsolidatedInvestee seic:LSVAssetManagement,us-gaap:EquityMethodInvestmentNonconsolidatedInvesteeOrGroupOfInvestees▁▃▅▆█4.2494.4354.624.8024.98NA5.326NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:DeferredIncomeTaxLiabilitiesNet ▁▄▇▁▃▆▅█47.64450.89255.15947.57850.21953.99152.956.339NANA55.753NANANA45.705NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:OtherLiabilitiesNoncurrent ▆▆▅▆▆▇▇██▇▇██▂▁21.04121.09720.05422.5222.60424.41224.05226.29225.34424.49224.21526.026.38612.95910.629NANANA0.0NANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:OperatingLeaseLiabilityNoncurrent ▁▂▃▃▃▅▆▅▆█31.69733.08934.05834.76835.22437.00838.4537.81639.42741.838NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo NANA8.917NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree NANA8.922NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour NANA7.252NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFive NANA5.184NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive NANA5.988NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:StockholdersEquity ▇█▅▅▄▅▅▄▂▂▁▂▁1805.6061829.1081739.9071729.4331708.6251734.2661738.7781703.3071634.5011636.551593.1471630.511590.882NA1476.839NANANANANANANANANANANANANANANA1156.0021166.5671126.4951101.0971038.181081.3041040.1021054.5441025.3161053.591070.161077.0691041.57NANANA
us-gaap:CommonStockValue ▁▁▁▂▂▂▂▂▃▃▃▃▃▄▃▄▄▄▄▄▄▄▅▅▅▅▅▅▅▅▅▆▆▆▆▆▆▆▇▇███1.411.4271.4341.4451.4641.4791.4971.5021.5091.5231.5361.5551.5681.581.5711.5741.581.5871.591.61.6121.6191.6371.6461.6591.6611.6671.6711.6771.6911.6921.7051.7151.7231.7221.7291.7341.7551.7651.7961.8321.8511.861NANANA
us-gaap:AdditionalPaidInCapitalCommonStock █████▇▇▇▇▇▇▇▇▇▆▆▆▅▅▅▅▅▅▅▄▄▄▄▃▃▃▂▂▂▂▁▁▁▁▁▁▁▁1219.4871208.4331190.0011174.1421174.4111170.6491158.91137.6361122.0681111.3661106.6411101.2371094.7711085.3121027.7091002.909988.761976.007955.461941.37933.434912.506910.513892.549882.355854.995834.615805.197772.386758.645721.219700.673678.05652.858624.305604.963588.419587.971577.949581.027585.619576.28565.393NANANA
us-gaap:RetainedEarningsAccumulatedDeficit ▇█▆▇▆▇▇▇▅▆▅▆▅▆▃▃▂▂▁▂▁▂▂▃▃▃▂▃▂▃▂▃▃▃▂▃▃▃▃▃▄▄▃599.231634.651565.27581.244566.929597.486601.885599.949541.664552.381517.97556.581522.764544.923467.467448.356409.409420.712384.018400.778380.664408.684402.86435.915435.66445.368420.226440.767425.458444.022431.604462.633448.729445.233405.914468.919447.812460.727443.702470.38475.667493.646471.159NANANA
us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax ▅▅▄▃▂▁▃▁▂▂▂▂▃▄▄▄▃▁▁▂▃▃▃▄▅▄▆▆▇▇▇▇▇▇██▇█▇▇██▇-14.522-15.403-16.798-27.398-34.179-35.348-23.504-35.78-30.74-28.72-33.0-28.863-28.221-18.161-19.908-20.298-28.015-35.513-37.955-30.538-27.427-22.344-25.29-20.346-13.692-17.765-8.895-2.9953.8210.0141.4871.556-1.9991.2836.2395.6932.1374.0911.90.3877.0425.2923.157NANANA
us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue █▁10.1039.752NA6.4677.0626.929NA5.4535.0645.038NA5.8785.3235.195NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:NetCashProvidedByUsedInOperatingActivities █▆▄▆▇▄▇▇▇▃▇▇▇▅▆▆▅▃▆▅▄▃▅▅▃▃▆▄▄▂▅▅▄▂▅▃▂▂▄▄▂▃▅▃▂▁188.424136.57392.158132.392165.1698.972163.587163.89157.74659.899170.503155.022158.702104.174143.514131.529111.84373.012141.743124.04381.42978.021116.977117.69978.85477.93133.90897.90399.0543.942110.929116.98183.83939.475111.59170.78635.88939.22481.42682.69634.50458.336108.48162.25840.48718.1
us-gaap:NetCashProvidedByUsedInInvestingActivities ▄▄▅▄▅▅▄▅▅▅▄▅▃▅▅▁▅▄▅▄▅▅▅▅▅▅▅▅▅▅▅▄▆▄█▅▅▅▅▅▅▆▆▅▆▃-25.431-30.656-3.253-26.85-20.041-17.352-35.135-12.739-14.58-15.726-45.962-13.499-48.533-15.376-24.239-101.182-21.536-25.345-12.525-35.09-24.498-7.472-21.132-22.824-23.739-10.32-7.404-12.245-19.133-14.603-12.473-35.92517.983-31.99851.397-6.572-8.343-19.855-16.799-16.492-5.1866.5270.956-6.73611.714-47.409
us-gaap:NetCashProvidedByUsedInFinancingActivities ▁▄▅▄▂▁▆▆▃▃▄▄▂▅▆█▄▅▆▆▄▃▆▅▅▅▇▇▄▆▆▇▅█▄█▅▆▅▅▅▆▆▅▄▆-168.424-109.512-80.302-102.469-134.314-165.05-64.878-61.873-127.225-132.644-107.506-92.482-156.447-87.285-59.903-11.929-97.498-84.303-51.287-58.385-96.067-113.949-60.314-66.926-77.33-85.235-29.477-39.911-93.302-62.06-47.397-40.901-66.862-7.625-108.418-14.031-68.179-52.228-72.506-79.65-85.046-63.116-64.923-65.673-90.933-60.907
us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect ▅▅▅▅▅▁██▅▁▅▇▃▅▇▆▅▃-4.404-2.04416.9289.42211.406-94.57673.63885.12312.946-85.19912.56348.525-54.8554.05459.27824.61-1.008-34.329NANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:IncreaseDecreaseInAccountsPayable ▆▃▂▅▃█▂▆▄▂▅▅▄▆▅▅▃▅▄▆▄▄▄▃▄▃▆▃▄▁█▇▂▂▇▄▅▄▂▆▄▄▄▆3.762-2.237-5.2722.258-2.3068.663-4.2893.2180.252-5.6781.7591.642-0.9443.1950.8390.581-3.7351.406-1.0423.467-0.813-0.1570.509-2.1370.089-3.9023.44-1.9580.097-7.8628.965.473-4.815-4.6187.681-0.2831.6090.242-4.9054.0490.114-1.841-0.6444.152NANA
us-gaap:NetCashProvidedByUsedInOperatingActivities █▆▄▆▇▄▇▇▇▃▇▇▇▅▆▆▅▃▆▅▄▃▅▅▃▃▆▄▄▂▅▅▄▂▅▃▂▂▄▄▂▃▅▃▂▁188.424136.57392.158132.392165.1698.972163.587163.89157.74659.899170.503155.022158.702104.174143.514131.529111.84373.012141.743124.04381.42978.021116.977117.69978.85477.93133.90897.90399.0543.942110.929116.98183.83939.475111.59170.78635.88939.22481.42682.69634.50458.336108.48162.25840.48718.1
us-gaap:NetIncomeLoss ▇▆▅▃▁▂▆▇▆▃▄▆▅█133.778129.47125.882111.096101.066109.242128.737132.168126.54113.981116.034128.319121.677139.838NANANANANANANANA81.37979.42586.2484.61177.09783.98382.81374.8265.51567.19583.49471.9256.58550.74349.55549.96544.39649.23253.60357.72862.456.38953.47859.42
 us-gaap:ProfitLoss us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName,us-gaap:EquityMethodInvestmentNonconsolidatedInvestee seic:LSVAssetManagement,us-gaap:EquityMethodInvestmentNonconsolidatedInvesteeOrGroupOfInvestees▆▅▄▁▂▂█▇▇90.5285.9281.43670.4472.84776.897100.61596.69997.271NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:NetCashProvidedByUsedInInvestingActivities ▄▄▅▄▅▅▄▅▅▅▄▅▃▅▅▁▅▄▅▄▅▅▅▅▅▅▅▅▅▅▅▄▆▄█▅▅▅▅▅▅▆▆▅▆▃-25.431-30.656-3.253-26.85-20.041-17.352-35.135-12.739-14.58-15.726-45.962-13.499-48.533-15.376-24.239-101.182-21.536-25.345-12.525-35.09-24.498-7.472-21.132-22.824-23.739-10.32-7.404-12.245-19.133-14.603-12.473-35.92517.983-31.99851.397-6.572-8.343-19.855-16.799-16.492-5.1866.5270.956-6.73611.714-47.409
us-gaap:PaymentsToAcquirePropertyPlantAndEquipment ▅▃▅▄▆█▅▅▅▄▄▄▃▃▃▄▃▂▃▇▃▃▄█▄▄▂▄▅▄▃▃▂▂▂▃▃▅▂▂▁▄▂▃▂▃11.2514.21811.3358.67113.76820.67412.58212.27610.9227.3177.4438.9817.065.6115.20710.0717.0423.2054.74117.6074.444.6098.74619.9928.3417.3862.0477.7911.0057.6275.9386.8491.821.7441.4195.3074.22812.1161.5273.771-0.3957.3682.0434.3672.664.541
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:NetCashProvidedByUsedInFinancingActivities ▁▄▅▄▂▁▆▆▃▃▄▄▂▅▆█▄▅▆▆▄▃▆▅▅▅▇▇▄▆▆▇▅█▄█▅▆▅▅▅▆▆▅▄▆-168.424-109.512-80.302-102.469-134.314-165.05-64.878-61.873-127.225-132.644-107.506-92.482-156.447-87.285-59.903-11.929-97.498-84.303-51.287-58.385-96.067-113.949-60.314-66.926-77.33-85.235-29.477-39.911-93.302-62.06-47.397-40.901-66.862-7.625-108.418-14.031-68.179-52.228-72.506-79.65-85.046-63.116-64.923-65.673-90.933-60.907
us-gaap:PaymentsOfDividends ▅▅▁▁▅▅▁▁▅▅▁▁▅▅▁▁▅▅▁▁▅▅▁▁▄▄▁▁▄▄▁▁▄▁█▁▃▃▁▁▃▁▃▁▃▂52.38953.1270.00.051.46252.4520.00.049.98550.760.00.047.13947.1790.00.044.26544.5970.00.0641.94942.6770.00.039.85240.1780.00.03836.94237.3140.00.034.40.082.70.026.11726.5180.00.022.0410.018.6230.018.8917.121
us-gaap:PaymentsForRepurchaseOfCommonStock █▄▆▇▅█▅▅▆▆▇▆▆▅▄▄▄▃▄▄▅▅▅▅▄▄▄▅▅▄▄▃▃▂▃▂▃▂▃▄▃▂▂▂▂▁126.11671.20699.922107.67588.846130.55883.49179.46592.61990.777116.821101.191101.37787.99561.84564.42865.51356.55367.44369.08577.35878.37278.11879.82765.89567.53460.01175.48374.34665.94862.45657.74551.9134.46645.9530.69444.43636.46354.17960.61654.63639.50134.49237.6430.3317.313
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
 us-gaap:DebtInstrumentInterestRateStatedPercentage us-gaap:CreditFacility,us-gaap:DebtInstrument us-gaap:LineOfCredit,seic:A2021CreditFacilityNANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:DebtInstrumentInterestRateStatedPercentage us-gaap:CreditFacility,us-gaap:DebtInstrument,us-gaap:SubsequentEventType us-gaap:LineOfCredit,seic:A2021CreditFacility,us-gaap:SubsequentEventNANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA

Common Stock Value

us-gaap:CommonStockValue

us-gaap:CommonStockValue


Common
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value1410000.01427000.01434000.01445000.01464000.01479000.01497000.01502000.01509000.01523000.01536000.01555000.01568000.01580000.01571000.01574000.01580000.01587000.01590000.01600000.01612000.01619000.01637000.01646000.01659000.01661000.01667000.01671000.01677000.01691000.01692000.01705000.01715000.01723000.01722000.01729000.01734000.01755000.01765000.01796000.01832000.01851000.01861000.01902000.0
Percentage of CommonStockValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.1

Common Stock Shares Issued

us-gaap:CommonStockSharesIssued

us-gaap:CommonStockSharesIssued


Common
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value141142143144146147149150150152153155156157157157157158159159161161163164165166166167167169169170171172172172173175176179183185186190
Percentage of CommonStockSharesIssued100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:CommonStockSharesIssued us-gaap:StatementEquityComponents

us-gaap:CommonStock


Common
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-312008-12-31
Value141142143144146147149150150152153155156157157159163166169172176186190191
Percentage of CommonStockSharesIssued100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0

Common Stock Shares Outstanding

us-gaap:CommonStockSharesOutstanding

us-gaap:CommonStockSharesOutstanding


Common
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value141142143144146147149150150152153155156157157157157158159159161161163164165166166167167169169170171172172172173175176179183185186190
Percentage of CommonStockSharesOutstanding100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Weighted Average Number Of Diluted Shares Outstanding

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding


Weighted
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-30
Value144145147149152154155156160162163161161162163165166169169170172172173176176176175175
Percentage of WeightedAverageNumberOfDilutedSharesOutstanding100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount

us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount

us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount


Antidilutive
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-30
Value11118.8138.1547.4086.2396.2446.3236.1836.2216.0541111111010109.93810104.4115.3974.3893.0425.5486.8639.5521614167.6757.6099.8110
Percentage of AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Earnings Per Share Basic

us-gaap:EarningsPerShareBasic

us-gaap:EarningsPerShareBasic


Earnings
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value0.940.90.870.760.690.730.860.880.830.740.750.820.770.890.780.640.580.560.550.540.50.480.490.480.520.510.460.50.490.440.390.390.480.420.330.290.280.280.250.270.290.310.330.30.280.31
Percentage of EarningsPerShareBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Earnings Per Share Diluted

us-gaap:EarningsPerShareDiluted

us-gaap:EarningsPerShareDiluted


Earnings
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value0.930.890.860.750.680.720.840.860.820.730.730.80.750.860.750.630.570.550.550.530.490.470.480.470.510.50.450.490.480.430.370.380.470.410.320.290.280.280.250.270.290.310.330.30.280.31
Percentage of EarningsPerShareDiluted100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Allocated Share Based Compensation Expense

us-gaap:AllocatedShareBasedCompensationExpense

us-gaap:AllocatedShareBasedCompensationExpense


Allocated
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value109.7526.5566.4677.0626.9299.0275.4535.0645.0387.4095.8785.3235.195167.0886.2596.183.9734.0664.1893.7895.8363.8673.8593.753.9823.7862.8722.8231011105.2933.9593.8793.8654.0333.1463.4243.813.732103.4686.2786.657
Percentage of AllocatedShareBasedCompensationExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax2.12.11.51.51.81.72.11.31.21.31.81.41.31.34.11.81.71.71.11.11.21.11.71.21.11.21.21.20.90.93.64.03.91.91.51.51.61.71.41.51.61.64.51.62.73.0

Comprehensive Income Net Of Tax

us-gaap:ComprehensiveIncomeNetOfTax

us-gaap:ComprehensiveIncomeNetOfTax


Comprehensive
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value134130136117102971411271247177867365708066575447524542555962605059
Percentage of ComprehensiveIncomeNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax28.328.730.827.725.523.533.330.530.422.124.027.224.321.925.229.224.621.821.619.721.920.318.323.325.727.227.622.127.0

Costs And Expenses

us-gaap:CostsAndExpenses

us-gaap:CostsAndExpenses


Costs
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-30
Value339322319313300304307295289297302296294289301286275266270257250247253248241232232231225223230218216211205198187189181182
Percentage of CostsAndExpenses100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax71.470.872.173.875.073.472.671.070.774.274.672.572.871.373.874.373.974.073.472.672.874.075.574.171.671.472.071.970.674.177.177.978.977.978.578.877.779.880.478.1

Gain Loss On Investments

us-gaap:GainLossOnInvestments

us-gaap:GainLossOnInvestments


Gain
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value0.3770.3321.0240.7761.903-3.9891.0530.6110.2311.2790.1350.089-0.139-0.410.2330.6450.0440.347-0.2080.1960.25-0.1260.088-0.756-0.0380.250.565-0.4780.3910.1360.0210.535-0.1770.286.493.7080.6643.205-0.552-1.418-1.9487.278189.3623.59417
Percentage of GainLossOnInvestments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.10.10.20.20.5-1.00.20.10.10.30.00.0-0.0-0.10.10.20.00.1-0.10.10.1-0.00.0-0.2-0.00.10.2-0.10.10.00.00.2-0.10.12.51.50.31.3-0.2-0.6-0.83.17.84.31.67.9

General And Administrative Expense

us-gaap:GeneralAndAdministrativeExpense us-gaap:ConsolidationItems

us-gaap:GeneralAndAdministrativeExpense

us-gaap:CorporateNonSegment


General
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value2221181717161620191416141815151416151313151212131212111113141213
Percentage of GeneralAndAdministrativeExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax4.74.74.24.34.33.94.05.04.83.74.13.74.44.04.24.14.54.54.03.94.63.83.84.13.94.03.63.94.45.14.65.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:CorporateNonSegment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Gross Profit

us-gaap:GrossProfit

us-gaap:GrossProfit


Gross
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-06-302012-03-31
Value15815414412911712813513613612312212712613112411411210811411310799979910810610210310590817670736458
Percentage of GrossProfit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax33.333.932.630.429.430.932.032.933.430.830.231.231.332.430.629.730.330.031.131.931.229.929.129.832.232.731.932.133.029.827.227.225.727.126.824.7

us-gaap:GrossProfit us-gaap:ConsolidationItems

us-gaap:OperatingSegments


Gross
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-30
Value15815412911712813613612312212712613112411411210811411310799979910810610210310590817670736764
Percentage of GrossProfit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax33.333.930.429.430.932.933.430.830.231.231.332.430.629.730.330.031.131.931.229.929.129.832.232.731.932.133.029.827.227.225.727.125.925.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:GrossProfit us-gaap:StatementBusinessSegments

seic:InstitutionalInvestors


Gross
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-31
Value4345454139404143414139424244424039384439383736373938363735343130303130282725
Percentage of GrossProfit27.729.431.432.333.631.931.031.530.533.532.733.733.633.734.335.234.935.338.934.735.537.637.237.636.336.035.435.834.238.438.839.943.543.00.00.041.942.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax9.210.010.29.89.99.99.910.310.210.39.910.510.510.910.510.510.610.612.111.111.111.210.811.211.711.811.311.511.311.410.610.911.211.611.711.311.310.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax seic:InstitutionalInvestors0.00.00.00.00.00.00.00.00.00.00.00.00.051.80.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

seic:InvestmentAdvisors


Gross
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-31
Value6058565143495151494243494646434343404140373132303634343634312927262320212020
Percentage of GrossProfit38.137.739.139.937.038.938.337.636.334.235.838.736.935.635.138.138.437.636.035.534.632.032.930.733.932.833.535.432.735.336.536.237.432.00.00.031.434.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax12.712.812.712.210.912.012.312.412.110.510.812.111.611.510.711.311.611.311.211.310.89.59.69.110.910.710.711.410.810.59.99.89.68.77.98.48.48.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax seic:InvestmentAdvisors0.00.00.00.00.00.00.00.00.00.00.00.00.047.10.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

seic:InvestmentManagers


Gross
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-31
Value5753494444424240403534353433333129282727232422232524232323211919181816171615
Percentage of GrossProfit36.534.634.234.038.033.031.129.429.928.828.328.227.025.526.927.226.426.324.123.922.324.723.323.323.123.223.222.721.924.224.525.526.925.40.00.025.626.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax12.211.711.110.411.110.29.99.710.08.98.68.88.58.38.28.18.07.97.57.67.07.46.86.97.47.67.47.37.27.26.76.96.96.96.36.86.96.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax seic:InvestmentManagers0.00.00.00.00.00.00.00.00.00.00.00.00.034.60.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

seic:InvestmentsInNewBusinesses


Gross
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-31
Value-9.559-9.538-11.422-9.798-10.117-7.522-5.571-4.478-3.736-2.902-3.21-2.827-3.126-3.202-3.813-3.293-3.407-3.259-3.464-3.811-3.855-3.824-4.394-3.752-3.404-3.565-3.814-3.383-3.309-3.131-3.001-3.059-2.882-2.778-2.981-2.798-2.733-2.784
Percentage of GrossProfit-6.0-6.2-7.9-7.6-8.6-5.9-4.1-3.3-2.7-2.3-2.6-2.2-2.5-2.4-3.1-2.9-3.0-3.0-3.0-3.4-3.6-3.8-4.5-3.8-3.1-3.3-3.7-3.3-3.1-3.5-3.7-4.0-4.1-3.80.00.0-4.2-4.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-2.0-2.1-2.6-2.3-2.5-1.8-1.3-1.1-0.9-0.7-0.8-0.7-0.8-0.8-0.9-0.9-0.9-0.9-0.9-1.1-1.1-1.1-1.3-1.1-1.0-1.1-1.2-1.1-1.0-1.0-1.0-1.1-1.0-1.0-1.1-1.1-1.1-1.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax seic:InvestmentsInNewBusinesses0.00.00.00.00.00.00.00.00.00.00.00.00.0-168.90.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

seic:PrivateBank


Gross
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-31
Value6.0226.8844.6151.7260.0032.5685.0796.4628.3027.2976.9791.9786.2849.9628.5452.6933.8314.0844.67510119.6210121011119.649154.9893.1131.791-2.6132.4483.0320.8673.4170.471
Percentage of GrossProfit3.84.53.21.30.02.03.74.76.15.95.71.65.07.66.82.33.43.84.19.211.29.611.212.19.811.211.79.314.55.53.82.3-3.73.30.00.05.30.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1.31.51.00.40.00.61.21.62.01.81.70.51.62.52.10.71.01.11.32.93.52.93.33.63.13.73.73.04.81.61.00.6-1.00.91.20.31.40.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax seic:PrivateBank0.00.00.00.00.00.00.00.00.00.00.00.00.08.20.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
Value172167156141131139159162162146143157154158152140135128133130124119115120133131115128128116101931291108783787968748292
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax36.236.735.333.232.933.637.839.139.636.535.538.638.139.137.336.536.335.736.136.936.335.834.335.939.640.335.839.940.438.633.833.547.140.833.533.232.533.630.332.134.839.6

Income Tax Expense Benefit

us-gaap:IncomeTaxExpenseBenefit

us-gaap:IncomeTaxExpenseBenefit


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value38373030302931303532272932183039433944444342334147463844464135264538303228292325283433343236
Percentage of IncomeTaxExpenseBenefit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax8.18.36.97.17.67.27.47.48.78.16.87.28.04.77.410.111.711.112.112.512.812.610.012.314.114.311.913.914.413.811.99.516.714.211.712.911.912.510.510.812.114.714.415.614.316.4

Interest Expense

us-gaap:InterestExpense

us-gaap:InterestExpense


Interest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value130000.0123000.0153000.0153000.0151000.0152000.0153000.0154000.0166000.0157000.0134000.0122000.0132000.0257000.0210000.0345000.0114000.0112000.0115000.0115000.0187000.0114000.0141000.0115000.0114000.0113000.0116000.0115000.0114000.0113000.0113000.0195000.0114000.0113000.0115000.0115000.0113000.0161000.0100000.0126000.0155000.0204000.0256000.0336000.0415000.0471000.0
Percentage of InterestExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.00.00.00.00.00.00.00.00.00.00.00.00.00.10.10.10.00.00.00.00.10.00.00.00.00.00.00.00.00.00.00.10.00.00.00.00.00.10.00.10.10.10.10.20.20.2

Net Income Loss

us-gaap:NetIncomeLoss

us-gaap:NetIncomeLoss


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value133129125111101109128132126113116128121139817986847783827465678371565049494449535762565359
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax28.128.428.426.125.226.330.431.830.928.428.631.430.134.524.323.725.526.023.926.126.024.721.923.930.426.521.620.220.521.019.621.122.524.827.025.723.426.8

us-gaap:NetIncomeLoss us-gaap:StatementEquityComponents

us-gaap:RetainedEarnings


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value133129125111101109128132126113116128121139
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax28.128.428.426.125.226.330.431.830.928.428.631.430.134.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Operating Costs And Expenses

us-gaap:OperatingCostsAndExpenses

us-gaap:OperatingCostsAndExpenses


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value317301299295282286287279272277282281278274283271259251254241236234237235229219219218213212217204204198193186176179171171173167167155161
Percentage of OperatingCostsAndExpenses100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax66.766.167.469.670.669.168.067.166.669.269.868.868.767.669.470.369.770.068.968.168.870.170.970.267.867.368.167.967.070.272.872.874.372.974.174.273.275.375.873.573.072.172.670.970.8

us-gaap:OperatingCostsAndExpenses us-gaap:StatementBusinessSegments

seic:InstitutionalInvestors


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value413936373638383739384040404144403838443636353736363536353534353333313029282826252726282526
Percentage of OperatingCostsAndExpenses13.213.012.312.813.113.413.413.314.414.014.514.414.715.015.614.714.915.417.415.315.515.115.615.715.916.116.416.216.416.116.416.216.215.915.515.916.315.715.614.915.816.116.716.716.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax8.88.68.38.99.29.29.19.09.69.710.19.910.110.210.810.410.410.812.010.410.610.611.111.010.810.811.211.011.011.311.911.812.011.611.511.811.911.811.810.911.511.612.111.811.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax seic:InstitutionalInvestors0.00.00.00.00.00.00.00.00.00.00.00.00.048.20.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

seic:InvestmentAdvisors


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value595551515052535150525353535254504947454544444645403938373534353332313130292927282727282628
Percentage of OperatingCostsAndExpenses18.618.317.317.417.718.318.718.418.518.919.018.919.119.119.218.619.018.917.918.718.919.119.619.317.817.817.517.316.716.316.416.516.115.916.416.116.416.416.116.416.016.116.817.017.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax12.412.111.712.112.512.612.712.412.313.113.213.013.112.913.313.113.313.212.412.713.013.413.913.612.112.011.911.711.211.411.912.012.011.612.112.012.012.312.212.011.711.612.212.012.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax seic:InvestmentAdvisors0.00.00.00.00.00.00.00.00.00.00.00.00.052.90.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

seic:InvestmentManagers


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value848380797474727168696765636360595352504846454543424040403939393736353432303029292927272525
Percentage of OperatingCostsAndExpenses26.827.626.827.026.425.925.325.725.124.923.923.222.823.121.522.120.820.719.820.119.919.319.118.618.418.518.418.418.518.518.218.517.917.718.017.217.117.017.117.216.916.716.416.515.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax17.918.218.118.818.617.917.217.316.717.216.716.015.615.614.915.514.514.513.613.713.713.513.513.112.512.512.512.512.413.013.213.513.312.913.312.812.512.812.912.612.312.011.911.711.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax seic:InvestmentManagers0.00.00.00.00.00.00.00.00.00.00.00.00.065.40.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

seic:InvestmentsInNewBusinesses


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value1313151313108.9977.9266.7975.946.1645.7695.945.0985.6115.0635.1244.885.0275.3485.3555.2325.8085.1794.8034.8665.0634.6144.4514.2493.9494.1463.893.7383.8743.6983.6843.6983.0852.4292.923.1253.1964.082.739
Percentage of OperatingCostsAndExpenses4.34.45.14.54.83.83.12.82.52.12.22.12.11.92.01.92.01.92.02.22.32.22.42.22.12.22.32.12.12.01.82.01.91.92.02.02.12.11.81.41.71.91.92.61.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax2.92.93.43.13.42.62.11.91.71.51.51.41.51.31.41.31.41.41.41.51.61.61.71.51.41.51.61.41.41.41.31.51.41.41.51.51.51.61.41.01.21.31.41.91.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax seic:InvestmentsInNewBusinesses0.00.00.00.00.00.00.00.00.00.00.00.00.0268.90.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

seic:PrivateBank


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value1171101151131071101131101071101141161141121181151121081091051021031021041049999100981001029597969391848784858682807378
Percentage of OperatingCostsAndExpenses37.136.738.538.338.138.639.539.739.540.040.441.441.340.941.842.743.343.142.943.743.544.343.244.245.745.345.546.046.347.247.246.847.948.648.248.848.148.949.450.149.749.248.247.248.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax24.724.325.926.626.926.726.826.626.327.728.228.528.427.729.030.030.230.229.629.829.931.030.631.131.030.531.031.231.033.134.434.135.635.435.736.235.236.837.536.836.335.435.033.534.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax seic:PrivateBank0.00.00.00.00.00.00.00.00.00.00.00.00.091.80.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Operating Income Loss

us-gaap:OperatingIncomeLoss

us-gaap:OperatingIncomeLoss


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value13613212411110011011612012010310211211011610699979398979386828795939090937868615760565353484451535451555753
Percentage of OperatingIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax28.629.227.926.225.026.627.429.029.325.825.427.527.228.726.225.726.126.026.627.427.226.024.525.928.428.628.028.129.425.922.922.121.122.121.521.222.320.219.621.922.723.522.425.125.024.1

Profit Loss

us-gaap:ProfitLoss us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, us-gaap:EquityMethodInvestmentNonconsolidatedInvestee

us-gaap:ProfitLoss

seic:LSVAssetManagement, us-gaap:EquityMethodInvestmentNonconsolidatedInvesteeOrGroupOfInvestees


Profit
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value9085817072761009697
Percentage of ProfitLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax19.018.918.416.618.218.523.823.223.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax seic:LSVAssetManagement us-gaap:EquityMethodInvestmentNonconsolidatedInvesteeOrGroupOfInvestees0.00.00.00.00.00.00.00.00.0

Revenue From Contract With Customer Excluding Assessed Tax

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value475455443424400414423416409400405408404405408386372359368354343334335335337325322322318302299280274271261251241237226233237232231219228221
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Revenues

us-gaap:Revenues

us-gaap:Revenues


Revenues
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value475455443424400414423416409400405408404405408386372359368354343334335335337325322322318302299280274271261251241237226233237232231219228221
Percentage of Revenues100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:Revenues us-gaap:ProductOrService

seic:AccountFeesAndOther


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value1314121112121011111211101010
Percentage of Revenues2.93.12.82.83.12.92.62.82.83.02.82.62.52.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax2.93.12.82.83.12.92.62.82.83.02.82.62.52.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax seic:AccountFeesAndOther0.00.00.00.00.00.00.00.00.00.00.00.00.0100.0

seic:AssetManagementAdministrationAndDistributionFees


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value382367353339320331337330324313314322316316314300289
Percentage of Revenues80.480.779.779.980.080.079.779.579.378.377.779.078.278.077.177.877.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax80.480.779.779.980.080.079.779.579.378.377.779.078.278.077.177.877.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax seic:AssetManagementAdministrationAndDistributionFees0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

seic:InformationProcessingAndSoftwareServicingFees


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value9388908580828585848690858889938582
Percentage of Revenues19.619.320.320.120.020.020.320.520.721.722.321.021.822.022.922.222.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax19.619.320.320.120.020.020.320.520.721.722.321.021.822.022.922.222.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax seic:InformationProcessingAndSoftwareServicingFees0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

seic:InvestmentManagementFeesFromInvestmentManagementAgreements


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value1131081049992969796959393959393
Percentage of Revenues23.923.823.423.323.123.323.223.123.323.323.023.423.223.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax23.923.823.423.323.123.323.223.123.323.323.023.423.223.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax seic:InvestmentManagementFeesFromInvestmentManagementAgreements0.00.00.00.00.00.00.00.00.00.00.00.00.0100.0

seic:InvestmentManagementFeesFromInvestmentProducts


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value122119117114105116122120117113117123123123
Percentage of Revenues25.826.326.526.926.428.229.028.928.828.429.030.330.530.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax25.826.326.526.926.428.229.028.928.828.429.030.330.530.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax seic:InvestmentManagementFeesFromInvestmentProducts0.00.00.00.00.00.00.00.00.00.00.00.00.0100.0

seic:InvestmentOperationsFees


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value1321251191131091061061021009592928887
Percentage of Revenues27.927.527.026.727.325.725.124.724.523.822.922.621.921.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax27.927.527.026.727.325.725.124.724.523.822.922.621.921.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax seic:InvestmentOperationsFees0.00.00.00.00.00.00.00.00.00.00.00.00.0100.0

seic:InvestmentProcessingFeesPaaS


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value5550464744464643434349454445
Percentage of Revenues11.711.210.611.211.011.111.010.410.511.012.211.111.011.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax11.711.210.611.211.011.111.010.410.511.012.211.111.011.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax seic:InvestmentProcessingFeesPaaS0.00.00.00.00.00.00.00.00.00.00.00.00.0100.0

seic:InvestmentProcessingFeesSaaS


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value3231313131323236373735353736
Percentage of Revenues6.86.97.27.37.87.87.68.89.19.38.88.69.39.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax6.86.97.27.37.87.87.68.89.19.38.88.69.39.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax seic:InvestmentProcessingFeesSaaS0.00.00.00.00.00.00.00.00.00.00.00.00.0100.0

seic:ProfessionalServicesFees


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value4.7955.554117.6794.5413.9896.6374.9314.1345.1945.2415.26.1767.306
Percentage of Revenues1.01.22.51.81.11.01.61.21.01.31.31.31.51.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1.01.22.51.81.11.01.61.21.01.31.31.31.51.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax seic:ProfessionalServicesFees0.00.00.00.00.00.00.00.00.00.00.00.00.0100.0

us-gaap:Revenues us-gaap:ProductOrService, us-gaap:StatementBusinessSegments

seic:AccountFeesAndOther, seic:InstitutionalInvestors


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value0.7190.4680.3990.3550.7050.1760.1360.3620.2340.2810.590.5340.4790.357
Percentage of Revenues0.20.10.10.10.20.00.00.10.10.10.10.10.10.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.20.10.10.10.20.00.00.10.10.10.10.10.10.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax seic:AccountFeesAndOther seic:InstitutionalInvestors0.00.00.00.00.00.00.00.00.00.00.00.00.0100.0

seic:AccountFeesAndOther, seic:InvestmentAdvisors


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value6.0125.9265.2765.1414.9124.7214.5674.6434.5874.34.1414.3624.024.01
Percentage of Revenues1.31.31.21.21.21.11.11.11.11.11.01.11.01.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1.31.31.21.21.21.11.11.11.11.11.01.11.01.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax seic:AccountFeesAndOther seic:InvestmentAdvisors0.00.00.00.00.00.00.00.00.00.00.00.00.0100.0

seic:AccountFeesAndOther, seic:InvestmentManagers


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value5.816.3465.6495.1345.3235.714.7265.2954.9455.6114.5413.9723.9434.582
Percentage of Revenues1.21.41.31.21.31.41.11.31.21.41.11.01.01.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1.21.41.31.21.31.41.11.31.21.41.11.01.01.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax seic:AccountFeesAndOther seic:InvestmentManagers0.00.00.00.00.00.00.00.00.00.00.00.00.0100.0

seic:AccountFeesAndOther, seic:InvestmentsInNewBusinesses


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value0.1850.1510.2170.120.0930.0660.0290.0260.0230.0310.0330.0340.0280.037
Percentage of Revenues0.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax seic:AccountFeesAndOther seic:InvestmentsInNewBusinesses0.00.00.00.00.00.00.00.00.00.00.00.00.0100.0

seic:AccountFeesAndOther, seic:PrivateBank


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value0.8471.1091.0611.0461.2941.5181.4241.4151.4781.8121.8351.8051.811.788
Percentage of Revenues0.20.20.20.20.30.40.30.30.40.50.50.40.40.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.20.20.20.20.30.40.30.30.40.50.50.40.40.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax seic:AccountFeesAndOther seic:PrivateBank0.00.00.00.00.00.00.00.00.00.00.00.00.0100.0

seic:InvestmentManagementFeesFromInvestmentManagementAgreements, seic:InstitutionalInvestors


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value7169686562656666676666686769
Percentage of Revenues15.015.315.415.515.715.815.815.916.416.516.416.716.717.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax15.015.315.415.515.715.815.815.916.416.516.416.716.717.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax seic:InvestmentManagementFeesFromInvestmentManagementAgreements seic:InstitutionalInvestors0.00.00.00.00.00.00.00.00.00.00.00.00.0100.0

seic:InvestmentManagementFeesFromInvestmentManagementAgreements, seic:InvestmentAdvisors


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value3834322926272726252323242322
Percentage of Revenues8.17.67.27.06.66.66.66.36.25.95.96.05.85.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax8.17.67.27.06.66.66.66.36.25.95.96.05.85.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax seic:InvestmentManagementFeesFromInvestmentManagementAgreements seic:InvestmentAdvisors0.00.00.00.00.00.00.00.00.00.00.00.00.0100.0

seic:InvestmentManagementFeesFromInvestmentManagementAgreements, seic:InvestmentsInNewBusinesses


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value3.5613.3863.1933.0412.9082.9633.0613.0992.7132.6982.6332.6412.5491.634
Percentage of Revenues0.70.70.70.70.70.70.70.70.70.70.70.60.60.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.70.70.70.70.70.70.70.70.70.70.70.60.60.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax seic:InvestmentManagementFeesFromInvestmentManagementAgreements seic:InvestmentsInNewBusinesses0.00.00.00.00.00.00.00.00.00.00.00.00.0100.0

seic:InvestmentManagementFeesFromInvestmentManagementAgreements, seic:PrivateBank


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value0.6030.4730.410.4210.2920.3470.3170.3140.2830.7020.1840.1970.2140.198
Percentage of Revenues0.10.10.10.10.10.10.10.10.10.20.00.00.10.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.10.10.10.10.10.10.10.10.10.20.00.00.10.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax seic:InvestmentManagementFeesFromInvestmentManagementAgreements seic:PrivateBank0.00.00.00.00.00.00.00.00.00.00.00.00.0100.0

seic:InvestmentManagementFeesFromInvestmentProducts, seic:InstitutionalInvestors


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value1314131312131313131313141515
Percentage of Revenues2.93.13.13.23.23.23.23.33.43.43.43.63.83.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax2.93.13.13.23.23.23.23.33.43.43.43.63.83.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax seic:InvestmentManagementFeesFromInvestmentProducts seic:InstitutionalInvestors0.00.00.00.00.00.00.00.00.00.00.00.00.0100.0

seic:InvestmentManagementFeesFromInvestmentProducts, seic:InvestmentAdvisors


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value7572706862707372706669737272
Percentage of Revenues15.815.916.016.115.516.917.317.317.116.617.218.017.917.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax15.815.916.016.115.516.917.317.317.116.617.218.017.917.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax seic:InvestmentManagementFeesFromInvestmentProducts seic:InvestmentAdvisors0.00.00.00.00.00.00.00.00.00.00.00.00.0100.0

seic:InvestmentManagementFeesFromInvestmentProducts, seic:InvestmentManagers


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value0.0140.0590.1010.180.1630.1930.2160.1610.1840.2050.4830.2060.2390.0
Percentage of Revenues0.00.00.00.00.00.00.10.00.00.10.10.10.10.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.00.00.00.00.00.00.10.00.00.10.10.10.10.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax seic:InvestmentManagementFeesFromInvestmentProducts seic:InvestmentManagers0.00.00.00.00.00.00.00.00.00.00.00.00.00.0

seic:InvestmentManagementFeesFromInvestmentProducts, seic:InvestmentsInNewBusinesses


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value0.3260.3290.3480.3560.3480.3590.3360.3230.3250.3090.2880.2670.2370.225
Percentage of Revenues0.10.10.10.10.10.10.10.10.10.10.10.10.10.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.10.10.10.10.10.10.10.10.10.10.10.10.10.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax seic:InvestmentManagementFeesFromInvestmentProducts seic:InvestmentsInNewBusinesses0.00.00.00.00.00.00.00.00.00.00.00.00.0100.0

seic:InvestmentManagementFeesFromInvestmentProducts, seic:PrivateBank


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value3332323230323534333233343535
Percentage of Revenues7.17.17.37.67.67.98.38.28.28.28.28.58.78.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax7.17.17.37.67.67.98.38.28.28.28.28.58.78.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax seic:InvestmentManagementFeesFromInvestmentProducts seic:PrivateBank0.00.00.00.00.00.00.00.00.00.00.00.00.0100.0

seic:InvestmentOperationsFees, seic:InvestmentManagers


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value132125119113109106105102999492928887
Percentage of Revenues27.827.526.926.627.225.625.024.624.423.722.822.621.821.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax27.827.526.926.627.225.625.024.624.423.722.822.621.821.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax seic:InvestmentOperationsFees seic:InvestmentManagers0.00.00.00.00.00.00.00.00.00.00.00.00.0100.0

seic:InvestmentOperationsFees, seic:PrivateBank


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value0.4020.3690.4450.4460.4380.4750.4620.4340.3620.3760.3790.3810.3750.382
Percentage of Revenues0.10.10.10.10.10.10.10.10.10.10.10.10.10.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.10.10.10.10.10.10.10.10.10.10.10.10.10.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax seic:InvestmentOperationsFees seic:PrivateBank0.00.00.00.00.00.00.00.00.00.00.00.00.0100.0

seic:InvestmentProcessingFeesPaaS, seic:PrivateBank


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value5550464744464643434348444344
Percentage of Revenues11.711.210.611.211.011.111.010.410.511.012.011.010.811.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax11.711.210.611.211.011.111.010.410.511.012.011.010.811.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax seic:InvestmentProcessingFeesPaaS seic:PrivateBank0.00.00.00.00.00.00.00.00.00.00.00.00.0100.0

seic:InvestmentProcessingFeesSaaS, seic:InvestmentManagers


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value3.8553.7063.6173.4793.3923.2513.1052.7892.5932.5492.4462.4172.372.365
Percentage of Revenues0.80.80.80.80.80.80.70.70.60.60.60.60.60.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.80.80.80.80.80.80.70.70.60.60.60.60.60.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax seic:InvestmentProcessingFeesSaaS seic:InvestmentManagers0.00.00.00.00.00.00.00.00.00.00.00.00.0100.0

seic:InvestmentProcessingFeesSaaS, seic:PrivateBank


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value2827282728292934343433323534
Percentage of Revenues6.06.16.46.57.07.06.98.28.58.78.28.18.88.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax6.06.16.46.57.07.06.98.28.58.78.28.18.88.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax seic:InvestmentProcessingFeesSaaS seic:PrivateBank0.00.00.00.00.00.00.00.00.00.00.00.00.0100.0

seic:ProfessionalServicesFees, seic:InvestmentManagers


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value0.8671.1471.0792.0161.3841.2740.8461.3981.5481.4171.621.7921.9811.887
Percentage of Revenues0.20.30.20.50.30.30.20.30.40.40.40.40.50.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.20.30.20.50.30.30.20.30.40.40.40.40.50.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax seic:ProfessionalServicesFees seic:InvestmentManagers0.00.00.00.00.00.00.00.00.00.00.00.00.0100.0

seic:ProfessionalServicesFees, seic:PrivateBank


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value3.9284.407105.6633.1572.7155.7913.5332.5863.7773.6213.4084.1955.419
Percentage of Revenues0.81.02.31.30.80.71.40.80.60.90.90.81.01.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.81.02.31.30.80.71.40.80.60.90.90.81.01.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax seic:ProfessionalServicesFees seic:PrivateBank0.00.00.00.00.00.00.00.00.00.00.00.00.0100.0

us-gaap:Revenues us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, us-gaap:EquityMethodInvestmentNonconsolidatedInvestee

seic:LSVAssetManagement, us-gaap:EquityMethodInvestmentNonconsolidatedInvesteeOrGroupOfInvestees


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value116110102949499126121123
Percentage of Revenues24.524.323.022.323.624.129.929.130.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax24.524.323.022.323.624.129.929.130.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax seic:LSVAssetManagement us-gaap:EquityMethodInvestmentNonconsolidatedInvesteeOrGroupOfInvestees0.00.00.00.00.00.00.00.00.0

us-gaap:Revenues us-gaap:StatementBusinessSegments

seic:InstitutionalInvestors


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value858482797679808081808083838586807877887674727374757372727068676363636058555349525453535151
Percentage of Revenues18.018.518.618.719.119.119.019.319.820.020.020.420.621.121.320.821.021.424.121.521.721.821.922.222.522.622.522.522.322.722.522.623.223.223.223.123.222.422.122.423.022.923.223.222.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax18.018.518.618.719.119.119.019.319.820.020.020.420.621.121.320.821.021.424.121.521.721.821.922.222.522.622.522.522.322.722.522.623.223.223.223.123.222.422.122.423.022.923.223.222.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax seic:InstitutionalInvestors0.00.00.00.00.00.00.00.00.00.00.00.00.0100.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

seic:InvestmentAdvisors


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value119113108103931021051031009497102999998949288868581767876777472747066656159555251494945464948484346
Percentage of Revenues25.124.924.424.323.424.725.024.824.423.624.125.124.724.524.024.424.924.523.624.023.822.923.422.723.022.722.623.122.022.021.921.921.620.320.120.420.520.819.920.120.920.720.819.820.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax25.124.924.424.323.424.725.024.824.423.624.125.124.724.524.024.424.924.523.624.023.822.923.422.723.022.722.623.122.022.021.921.921.620.320.120.420.520.819.920.120.920.720.819.820.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax seic:InvestmentAdvisors0.00.00.00.00.00.00.00.00.00.00.00.00.0100.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

seic:InvestmentManagers


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value142136129123119116114112109104102101979694918380777570696867676564636261595755535149464644454443424039
Percentage of Revenues30.029.929.229.129.828.127.127.026.726.125.324.824.123.923.123.622.522.421.121.320.620.920.320.019.920.119.919.819.620.219.920.420.219.819.619.619.419.419.719.518.718.718.418.517.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax30.029.929.229.129.828.127.127.026.726.125.324.824.123.923.123.622.522.421.121.320.620.920.320.019.920.119.919.819.620.219.920.420.219.819.619.619.419.419.719.518.718.718.418.517.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax seic:InvestmentManagers0.00.00.00.00.00.00.00.00.00.00.00.00.0100.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

seic:InvestmentsInNewBusinesses


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value4.0723.8663.7583.5173.3493.3883.4263.4483.0613.0382.9542.9422.8141.8961.7981.771.7171.6211.5631.5371.51.4081.4141.4271.3991.3011.2491.2311.1421.1180.9481.0871.0080.960.8930.90.9510.9140.9060.9310.9361.051.0950.9891.013
Percentage of Revenues0.90.80.80.80.80.80.80.80.70.80.70.70.70.50.40.50.50.50.40.40.40.40.40.40.40.40.40.40.40.40.30.40.40.40.30.40.40.40.40.40.40.50.50.50.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.90.80.80.80.80.80.80.80.70.80.70.70.70.50.40.50.50.50.40.40.40.40.40.40.40.40.40.40.40.40.30.40.40.40.30.40.40.40.40.40.40.50.50.50.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax seic:InvestmentsInNewBusinesses0.00.00.00.00.00.00.00.00.00.00.00.00.0100.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

seic:PrivateBank


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value1231171191141071131181171161181211181211221261181161121131151141131131161151111111101141051059795989692888785878786858390
Percentage of Revenues26.025.827.027.026.927.328.028.228.329.530.029.029.930.131.130.731.231.330.832.733.433.933.934.634.134.234.734.235.834.835.434.734.736.336.936.636.637.037.937.637.037.337.138.039.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax26.025.827.027.026.927.328.028.228.329.530.029.029.930.131.130.731.231.330.832.733.433.933.934.634.134.234.734.235.834.835.434.734.736.336.936.636.637.037.937.637.037.337.138.039.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax seic:PrivateBank0.00.00.00.00.00.00.00.00.00.00.00.00.0100.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:Revenues us-gaap:StatementGeographical

country:CA


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value1312121111111212121212131314
Percentage of Revenues2.82.82.82.82.82.93.03.13.13.13.23.33.43.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax2.82.82.82.82.82.93.03.13.13.13.23.33.43.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax country:CA0.00.00.00.00.00.00.00.00.00.00.00.00.0100.0

country:GB


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value4240393834374037383840424242
Percentage of Revenues8.98.98.89.08.69.09.59.09.59.710.110.410.610.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax8.98.98.89.08.69.09.59.09.59.710.110.410.610.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax country:GB0.00.00.00.00.00.00.00.00.00.00.00.00.0100.0

country:IE


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value1716151414151514141312131212
Percentage of Revenues3.63.63.53.43.63.73.63.53.53.43.03.43.13.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax3.63.63.53.43.63.73.63.53.53.43.03.43.13.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax country:IE0.00.00.00.00.00.00.00.00.00.00.00.00.0100.0

country:US


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value402385376360340350354351343335338338335335
Percentage of Revenues84.784.784.884.884.984.483.984.583.983.783.682.882.882.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax84.784.784.884.884.984.483.984.583.983.783.682.882.882.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax country:US0.00.00.00.00.00.00.00.00.00.00.00.00.0100.0

seic:OtherGeographicAreas


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value0.1280.1290.1290.130.1330.1620.1540.1620.2520.2840.3090.3250.3310.838
Percentage of Revenues0.00.00.00.00.00.00.00.00.10.10.10.10.10.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.00.00.00.00.00.00.00.00.10.10.10.10.10.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax seic:OtherGeographicAreas0.00.00.00.00.00.00.00.00.00.00.00.00.0100.0

us-gaap:Revenues us-gaap:StatementGeographical, us-gaap:StatementBusinessSegments

country:CA, seic:InstitutionalInvestors


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value1.1981.3021.2831.2981.4311.5981.7111.7431.7081.7271.8261.8952.1342.671
Percentage of Revenues0.30.30.30.30.40.40.40.40.40.40.50.50.50.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.30.30.30.30.40.40.40.40.40.40.50.50.50.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax country:CA seic:InstitutionalInvestors0.00.00.00.00.00.00.00.00.00.00.00.00.00.0

country:CA, seic:PrivateBank


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value121111109.726101110101011111111
Percentage of Revenues2.62.52.52.52.42.52.62.62.72.72.72.92.82.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax2.62.52.52.52.42.52.62.62.72.72.72.92.82.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax country:CA seic:PrivateBank0.00.00.00.00.00.00.00.00.00.00.00.00.00.0

country:GB, seic:InstitutionalInvestors


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value1413131212121312131312131314
Percentage of Revenues3.03.03.03.03.13.13.13.13.23.43.23.43.43.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax3.03.03.03.03.13.13.13.13.23.43.23.43.43.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax country:GB seic:InstitutionalInvestors0.00.00.00.00.00.00.00.00.00.00.00.00.00.0

country:GB, seic:PrivateBank


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value2826252522242624252527282927
Percentage of Revenues5.95.95.95.95.65.96.35.96.36.36.97.07.26.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax5.95.95.95.95.65.96.35.96.36.36.97.07.26.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax country:GB seic:PrivateBank0.00.00.00.00.00.00.00.00.00.00.00.00.00.0

country:IE, seic:InstitutionalInvestors


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value2.5462.6192.5292.5262.2652.532.6112.312.3562.3112.1372.8283.0272.427
Percentage of Revenues0.50.60.60.60.60.60.60.60.60.60.50.70.70.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.50.60.60.60.60.60.60.60.60.60.50.70.70.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax country:IE seic:InstitutionalInvestors0.00.00.00.00.00.00.00.00.00.00.00.00.00.0

country:IE, seic:InvestmentManagers


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value109.4038.8767.658.2038.1867.4867.3277.4086.5915.5236.1434.7215.096
Percentage of Revenues2.12.12.01.82.02.01.81.81.81.61.41.51.21.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax2.12.12.01.82.02.01.81.81.81.61.41.51.21.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax country:IE seic:InvestmentManagers0.00.00.00.00.00.00.00.00.00.00.00.00.00.0

country:IE, seic:PrivateBank


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value4.5944.3664.2034.3294.0484.4475.0194.7974.6264.7954.6894.8844.9364.905
Percentage of Revenues1.01.00.91.01.01.11.21.21.11.21.21.21.21.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1.01.00.91.01.01.11.21.21.11.21.21.21.21.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax country:IE seic:PrivateBank0.00.00.00.00.00.00.00.00.00.00.00.00.00.0

country:US, seic:InstitutionalInvestors


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value6766656260626263636263646464
Percentage of Revenues14.314.614.714.815.115.014.815.215.515.515.715.815.816.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax14.314.614.714.815.115.014.815.215.515.515.715.815.816.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax country:US seic:InstitutionalInvestors0.00.00.00.00.00.00.00.00.00.00.00.00.00.0

country:US, seic:InvestmentAdvisors


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value1191131081039310210510310094971029999
Percentage of Revenues25.124.924.424.323.424.725.024.824.423.624.125.124.724.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax25.124.924.424.323.424.725.024.824.423.624.125.124.724.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax country:US seic:InvestmentAdvisors0.00.00.00.00.00.00.00.00.00.00.00.00.00.0

country:US, seic:InvestmentManagers


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value1321271201161111081071041019896959291
Percentage of Revenues27.927.927.227.327.726.125.325.224.924.523.923.322.922.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax27.927.927.227.327.726.125.325.224.924.523.923.322.922.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax country:US seic:InvestmentManagers0.00.00.00.00.00.00.00.00.00.00.00.00.00.0

country:US, seic:InvestmentsInNewBusinesses


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value4.0723.8663.7583.5173.3493.3883.4263.4483.0613.0382.9542.9422.8141.896
Percentage of Revenues0.90.80.80.80.80.80.80.80.70.80.70.70.70.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.90.80.80.80.80.80.80.80.70.80.70.70.70.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax country:US seic:InvestmentsInNewBusinesses0.00.00.00.00.00.00.00.00.00.00.00.00.00.0

country:US, seic:PrivateBank


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value7875787471747576747777737578
Percentage of Revenues16.616.517.717.617.917.817.918.518.319.319.217.918.719.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax16.616.517.717.617.917.817.918.518.319.319.217.918.719.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax country:US seic:PrivateBank0.00.00.00.00.00.00.00.00.00.00.00.00.00.0

seic:OtherGeographicAreas, seic:InstitutionalInvestors


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value0.1280.1290.1290.130.1330.1620.1540.1620.2520.2840.3090.3250.3310.838
Percentage of Revenues0.00.00.00.00.00.00.00.00.10.10.10.10.10.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.00.00.00.00.00.00.00.00.10.10.10.10.10.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax seic:OtherGeographicAreas seic:InstitutionalInvestors0.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Assets

us-gaap:Assets

us-gaap:Assets


Assets
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value21392150216720852053205821512040195219531971193918901893185317511634162416361573152015501588154315251521154214851435143814391391134713421309133212641293129413031330137813771533
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:Assets us-gaap:ConsolidationItems

us-gaap:CorporateNonSegment


Assetsus-gaap:
Period End2020-12-312019-12-312018-12-312017-12-312013-12-312012-12-31
Value877909809775657484
Percentage of Assets40.542.341.141.845.737.0
Percentage of Assets40.542.341.141.845.737.0
Percentage of Assets us-gaap:CorporateNonSegment100.0100.0100.0100.0100.0100.0

us-gaap:OperatingSegments


Assetsus-gaap:
Period End2020-12-312019-12-312018-12-312017-12-31
Value1290124211621078
Percentage of Assets59.557.758.958.2
Percentage of Assets59.557.758.958.2
Percentage of Assets us-gaap:OperatingSegments100.0100.0100.0100.0

us-gaap:Assets us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, seic:InstitutionalInvestors


Assetsus-gaap:
Period End2020-12-312019-12-312018-12-31
Value119115109
Percentage of Assets5.55.35.5
Percentage of Assets5.55.35.5
Percentage of Assets us-gaap:OperatingSegments seic:InstitutionalInvestors100.0100.0100.0

us-gaap:OperatingSegments, seic:InvestmentAdvisors


Assetsus-gaap:
Period End2020-12-312019-12-312018-12-31
Value169165143
Percentage of Assets7.87.77.3
Percentage of Assets7.87.77.3
Percentage of Assets us-gaap:OperatingSegments seic:InvestmentAdvisors100.0100.0100.0

us-gaap:OperatingSegments, seic:InvestmentManagers


Assetsus-gaap:
Period End2020-12-312019-12-312018-12-31
Value421373318
Percentage of Assets19.417.416.1
Percentage of Assets19.417.416.1
Percentage of Assets us-gaap:OperatingSegments seic:InvestmentManagers100.0100.0100.0

us-gaap:OperatingSegments, seic:InvestmentsInNewBusinesses


Assetsus-gaap:
Period End2020-12-312019-12-312018-12-31
Value221933
Percentage of Assets1.00.91.7
Percentage of Assets1.00.91.7
Percentage of Assets us-gaap:OperatingSegments seic:InvestmentsInNewBusinesses100.0100.0100.0

us-gaap:OperatingSegments, seic:PrivateBank


Assetsus-gaap:
Period End2020-12-312019-12-312018-12-31
Value557567558
Percentage of Assets25.726.428.3
Percentage of Assets25.726.428.3
Percentage of Assets us-gaap:OperatingSegments seic:PrivateBank100.0100.0100.0

us-gaap:Assets us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, us-gaap:EquityMethodInvestmentNonconsolidatedInvestee

seic:LSVAssetManagement, us-gaap:EquityMethodInvestmentNonconsolidatedInvesteeOrGroupOfInvestees


Assetsus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value133130155110119149
Percentage of Assets6.26.17.25.35.87.0
Percentage of Assets6.26.17.25.35.87.0
Percentage of Assets seic:LSVAssetManagement us-gaap:EquityMethodInvestmentNonconsolidatedInvesteeOrGroupOfInvestees100.0100.0100.0100.0100.0100.0

us-gaap:Assets us-gaap:StatementGeographical

country:US


Assetsus-gaap:
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-31
Value177217321612147113171330131512311066
Percentage of Assets81.880.581.879.480.583.885.285.681.4
Percentage of Assets81.880.581.879.480.583.885.285.681.4
Percentage of Assets country:US100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:NonUs


Assetsus-gaap:
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-31
Value395418359382319257
Percentage of Assets18.219.518.220.619.516.2
Percentage of Assets18.219.518.220.619.516.2
Percentage of Assets us-gaap:NonUs100.0100.0100.0100.0100.0100.0

Liabilities

us-gaap:Liabilities

us-gaap:Liabilities


Liabilities
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value334321427356344323412337318316378308299280376318262261333260232250298233219237295241231234283225221241252233207222253234243285320502
Percentage of Liabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets15.615.019.717.116.815.719.216.516.316.219.215.915.914.820.318.216.116.120.416.515.316.118.815.114.415.619.116.216.116.319.716.216.418.019.317.516.417.219.618.018.320.723.332.7

Liabilities And Stockholders Equity

us-gaap:LiabilitiesAndStockholdersEquity

us-gaap:LiabilitiesAndStockholdersEquity


Liabilities
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value21392150216720852053205821512040195219531971193918901893185317511634162416361573152015501588154315251521154214851435143814391391134713421309133212641293129413031330137813771533
Percentage of LiabilitiesAndStockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:LiabilitiesAndStockholdersEquity us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, us-gaap:EquityMethodInvestmentNonconsolidatedInvestee

seic:LSVAssetManagement, us-gaap:EquityMethodInvestmentNonconsolidatedInvesteeOrGroupOfInvestees


Liabilities
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value133130155110119149
Percentage of LiabilitiesAndStockholdersEquity6.26.17.25.35.87.0
Percentage of Assets6.26.17.25.35.87.0
Percentage of Assets seic:LSVAssetManagement us-gaap:EquityMethodInvestmentNonconsolidatedInvesteeOrGroupOfInvestees100.0100.0100.0100.0100.0100.0

Stockholders Equity

us-gaap:StockholdersEquity

us-gaap:StockholdersEquity


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value180518291739172917081734173817031634163615931630159014761156116611261101103810811040105410251053107010771041909
Percentage of StockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets84.485.080.382.983.284.380.883.583.783.880.884.184.179.780.383.883.682.079.381.282.281.579.280.880.478.275.659.3

us-gaap:StockholdersEquity us-gaap:StatementEquityComponents

us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302018-12-312017-12-312016-12-31
Value1.1481.2611.5511.6221.9261.6960.4650.494-1.413-0.386-0.836
Percentage of StockholdersEquity0.10.10.10.10.10.10.00.0-0.1-0.00.0
Percentage of Assets0.10.10.10.10.10.10.00.0-0.1-0.0-0.1
Percentage of Assets us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss0.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedOtherComprehensiveIncome


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-312016-12-31
Value-14.522-15.403-16.798-27.398-34.179-35.348-23.504-35.78-30.74-28.72-33.0-28.863-28.221-19.908-37.955
Percentage of StockholdersEquity-0.8-0.8-1.0-1.6-2.0-2.0-1.4-2.1-1.9-1.8-2.1-1.8-1.8-1.30.0
Percentage of Assets-0.7-0.7-0.8-1.3-1.7-1.7-1.1-1.8-1.6-1.5-1.7-1.5-1.5-1.1-2.3
Percentage of Assets us-gaap:AccumulatedOtherComprehensiveIncome0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedTranslationAdjustment


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302018-12-312017-12-312016-12-31
Value-15.67-16.664-18.349-29.02-36.105-37.044-23.969-36.274-31.587-19.522-37.119
Percentage of StockholdersEquity-0.9-0.9-1.1-1.7-2.1-2.1-1.4-2.1-2.0-1.30.0
Percentage of Assets-0.7-0.8-0.8-1.4-1.8-1.8-1.1-1.8-1.6-1.1-2.3
Percentage of Assets us-gaap:AccumulatedTranslationAdjustment0.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AdditionalPaidInCapital


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-312016-12-31
Value12191208119011741174117011581137112211111106110110941027955
Percentage of StockholdersEquity67.566.168.467.968.767.566.766.868.667.969.567.568.869.60.0
Percentage of Assets57.056.254.956.357.256.953.955.757.556.956.156.857.955.558.4
Percentage of Assets us-gaap:AdditionalPaidInCapital0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:CommonStock


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-312016-12-31
Value1.411.4271.4341.4451.4641.4791.4971.5021.5091.5231.5361.5551.5681.5711.59
Percentage of StockholdersEquity0.10.10.10.10.10.10.10.10.10.10.10.10.10.10.0
Percentage of Assets0.10.10.10.10.10.10.10.10.10.10.10.10.10.10.1
Percentage of Assets us-gaap:CommonStock0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:RetainedEarnings


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-312016-12-31
Value599634565581566597601599541552517556522467384
Percentage of StockholdersEquity33.234.732.533.633.234.534.635.233.133.832.534.132.931.70.0
Percentage of Assets28.029.526.127.927.629.028.029.427.728.326.328.727.625.223.5
Percentage of Assets us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Assets Current

us-gaap:AssetsCurrent

us-gaap:AssetsCurrent


Assets
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value13111324130012741232123313041240113711271190119311301171113910641028101910379769409751003967940942955883832842847800753747701670595617634638665702683841
Percentage of AssetsCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets61.361.660.061.160.059.960.760.858.357.760.461.559.861.961.560.863.062.863.462.161.962.963.262.761.662.061.959.558.058.658.957.555.955.753.550.347.147.749.049.050.051.049.654.9

us-gaap:AssetsCurrent us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, us-gaap:EquityMethodInvestmentNonconsolidatedInvestee

seic:LSVAssetManagement, us-gaap:EquityMethodInvestmentNonconsolidatedInvesteeOrGroupOfInvestees


Assets
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value129126151105114144
Percentage of AssetsCurrent9.99.511.68.39.311.1
Percentage of Assets6.15.97.05.15.66.7
Percentage of Assets seic:LSVAssetManagement us-gaap:EquityMethodInvestmentNonconsolidatedInvesteeOrGroupOfInvestees97.096.997.295.996.196.6

Cash And Cash Equivalents At Carrying Value

us-gaap:CashAndCashEquivalentsAtCarryingValue

us-gaap:CashAndCashEquivalentsAtCarryingValue


Cash
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-312007-12-31
Value780782784767758746841767682669754741693748744684660661695623594638679647624643667577532545578527487452452397347388420428442498496451461500590416360
Percentage of CashAndCashEquivalentsAtCarryingValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets36.536.436.236.836.936.339.137.634.934.338.338.336.739.540.239.140.440.742.539.639.141.242.842.041.042.343.338.937.137.940.237.936.133.734.529.827.530.032.532.933.236.136.00.00.00.038.50.00.0

us-gaap:CashAndCashEquivalentsAtCarryingValue us-gaap:RestrictedCashAndCashEquivalentsCashAndCashEquivalents

seic:SeiSponsoredOpenEndedMoneyMarketMutualFunds


Cash
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-312017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312012-12-31
Value313323347305335278414319272269315401313374347311402448401382419435374328368387247
Percentage of CashAndCashEquivalentsAtCarryingValue40.141.444.239.844.337.349.341.740.040.341.953.947.453.955.852.363.166.162.061.365.265.264.861.667.667.054.7
Percentage of Assets14.715.116.014.616.313.519.315.714.013.816.021.719.322.922.120.526.028.326.025.127.528.225.222.925.626.918.9
Percentage of Assets seic:SeiSponsoredOpenEndedMoneyMarketMutualFunds0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents


Cash
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312015-12-31
Value781785787770761749844770685672758745696751747688663664699685
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets36.536.536.337.037.136.439.337.835.134.438.438.436.939.740.339.340.640.942.743.1

Accounts Receivable Net Current

us-gaap:AccountsReceivableNetCurrent

us-gaap:AccountsReceivableNetCurrent


Accounts
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312018-12-31
Value409406385378351358340315
Percentage of AccountsReceivableNetCurrent100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets19.118.917.818.117.117.415.816.0

Other Assets Current

us-gaap:OtherAssetsCurrent

us-gaap:OtherAssetsCurrent


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value3842383835423234313536373634313031292730302826292225182121191619172018181719171716171615
Percentage of OtherAssetsCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets1.82.01.81.81.72.01.51.71.61.81.91.91.91.81.71.72.01.81.71.92.01.91.61.91.51.61.21.41.51.41.11.41.31.51.41.41.41.51.41.31.21.31.21.0

Assets Noncurrent

us-gaap:AssetsNoncurrent us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, us-gaap:EquityMethodInvestmentNonconsolidatedInvestee

us-gaap:AssetsNoncurrent

seic:LSVAssetManagement, us-gaap:EquityMethodInvestmentNonconsolidatedInvesteeOrGroupOfInvestees


Assets
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value4023000.04098000.04296000.04484000.04625000.05048000.0
Percentage of AssetsNoncurrent100.0100.0100.0100.0100.0100.0
Percentage of Assets0.20.20.20.20.20.2
Percentage of Assets seic:LSVAssetManagement us-gaap:EquityMethodInvestmentNonconsolidatedInvesteeOrGroupOfInvestees3.03.12.84.13.93.4

Property Plant And Equipment Gross

us-gaap:PropertyPlantAndEquipmentGross

us-gaap:PropertyPlantAndEquipmentGross


Property
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value578570567550549533514500502491484477468462456451443434431427410407403401381372366364357346339333328328328327326322312315314307
Percentage of PropertyPlantAndEquipmentGross100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets27.026.526.226.426.825.923.924.525.725.224.624.624.824.424.625.827.226.726.427.227.026.325.426.025.024.523.824.524.924.123.623.924.424.525.124.625.925.024.124.223.622.3

us-gaap:PropertyPlantAndEquipmentGross us-gaap:PropertyPlantAndEquipmentByType

seic:PurchasedSoftware


Property
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312012-12-31
Value152149147145145144143142140139139138138136134133131128128128123122122122108105104104101989691
Percentage of PropertyPlantAndEquipmentGross26.326.126.026.426.527.127.928.528.028.428.829.029.529.529.529.629.629.629.730.130.130.130.330.528.328.428.628.628.528.428.427.8
Percentage of Assets7.16.96.87.07.17.06.77.07.27.27.17.17.37.27.37.68.07.97.88.28.17.97.77.97.16.96.87.07.16.86.77.0
Percentage of Assets seic:PurchasedSoftware0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:Building


Property
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312012-12-31
Value210206206162162162162162162160160154154154153153154152152151151151151151150150149149138138138137
Percentage of PropertyPlantAndEquipmentGross36.336.236.329.629.630.531.732.532.332.733.232.432.933.333.734.134.735.035.335.536.937.237.637.739.540.440.940.938.739.940.841.9
Percentage of Assets9.89.69.57.87.97.97.68.08.38.28.28.08.28.18.38.89.49.49.39.710.09.89.59.89.99.99.710.09.79.69.610.5
Percentage of Assets us-gaap:Building0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:ConstructionInProgress


Property
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312012-12-31
Value1.1243.8944.66555244332719139.24107.4255.7416.1054.5122.632.7982.0771.1750.7750.9890.9611.1880.9510.651.0941.315105.6382.5890.112
Percentage of PropertyPlantAndEquipmentGross0.20.70.810.19.58.36.55.43.82.81.92.21.61.21.31.00.60.60.50.30.20.20.20.30.20.20.30.42.91.60.80.0
Percentage of Assets0.10.20.22.72.62.11.61.31.00.70.50.50.40.30.30.30.20.20.10.10.10.10.10.10.10.00.10.10.70.40.20.0
Percentage of Assets us-gaap:ConstructionInProgress0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:Equipment


Property
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312012-12-31
Value147143141134137131123119130128126125121118115114111108106103928986878682787774717066
Percentage of PropertyPlantAndEquipmentGross25.425.125.024.525.024.724.123.926.026.126.226.425.925.725.325.325.124.924.724.222.522.021.521.922.522.221.321.220.720.720.720.1
Percentage of Assets6.96.76.56.56.76.45.85.96.76.66.46.56.46.36.26.56.86.66.56.66.15.85.55.75.65.45.15.25.25.04.95.1
Percentage of Assets us-gaap:Equipment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:FurnitureAndFixtures


Property
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312012-12-31
Value2121212020191818181818171818181717171717171716161616161717171718
Percentage of PropertyPlantAndEquipmentGross3.73.83.83.83.63.73.73.73.73.73.73.83.84.04.04.04.04.04.04.04.24.24.04.24.54.54.64.74.84.95.05.6
Percentage of Assets1.01.01.01.01.01.00.90.90.90.90.90.91.01.01.01.01.11.11.11.11.11.11.01.11.11.11.11.21.21.21.21.4
Percentage of Assets us-gaap:FurnitureAndFixtures0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:Land


Property
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312012-12-31
Value2424241010101010101010101010101010101010101010109.9979.9979.9979.9979.9979.9979.9299.929
Percentage of PropertyPlantAndEquipmentGross4.24.24.32.02.02.02.12.22.12.22.22.22.32.32.22.22.32.32.32.32.42.52.52.52.62.72.72.72.82.92.93.0
Percentage of Assets1.11.11.10.50.50.50.50.50.60.60.50.50.60.60.50.60.60.60.60.60.70.60.60.60.70.70.60.70.70.70.70.8
Percentage of Assets us-gaap:Land0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:LeaseholdImprovements


Property
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312012-12-31
Value2221212020192019202018181818181716151515141515118.8995.9745.6755.5365.6085.1734.675.037
Percentage of PropertyPlantAndEquipmentGross3.83.83.83.83.73.74.03.94.04.13.93.93.94.13.93.83.83.63.53.53.63.93.83.02.31.61.51.51.61.51.41.5
Percentage of Assets1.01.01.01.01.01.01.01.01.01.01.01.01.01.01.01.01.00.90.91.01.01.01.00.80.60.40.40.40.40.40.30.4
Percentage of Assets us-gaap:LeaseholdImprovements0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Accumulated Depreciation Depletion And Amortization Property Plant And Equipment

us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment

us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment


Accumulated
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value394386378370367360353346352345338331323317309302298291285278272266259258253246241235230225220214209205201195191186182182177172166158
Percentage of AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets18.418.017.517.717.917.516.417.018.017.717.217.117.116.816.717.318.317.917.417.717.917.216.316.816.616.215.615.916.115.715.315.415.515.315.414.715.214.414.114.013.412.512.110.3

Amortization Of Intangible Assets

us-gaap:AmortizationOfIntangibleAssets

us-gaap:AmortizationOfIntangibleAssets


Amortization
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value0.9210.9210.920.9210.9210.9210.920.9210.9210.9210.9210.921-10.158119.9431312121111111110101010109.8139.5849.2149.1048.8298.4278.242
Percentage of AmortizationOfIntangibleAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Property Plant And Equipment Net

us-gaap:PropertyPlantAndEquipmentNet

us-gaap:PropertyPlantAndEquipmentNet


Property
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value184184189180182173160154150146145145144145146148145142146149138141143142128125125128126121118118119123127131135136129133136142140146
Percentage of PropertyPlantAndEquipmentNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets8.68.68.78.78.98.47.57.67.77.57.47.57.67.77.98.58.98.88.99.59.19.19.19.28.48.38.18.78.88.48.38.58.89.29.79.910.710.510.010.210.310.310.29.5

Investments In Affiliates Subsidiaries Associates And Joint Ventures

us-gaap:InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures

us-gaap:InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures


Investments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value6.9326.6236.1665.2074.7493.7535.9884150565244515459424548503941444942505154636061615781777763636660677269640.0
Percentage of InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0
Percentage of Assets0.30.30.30.20.20.20.32.02.62.92.72.32.72.93.22.42.83.03.12.52.82.93.12.73.33.43.54.34.24.34.34.16.15.75.94.85.05.24.75.25.45.04.70.0

Goodwill

us-gaap:Goodwill

us-gaap:Goodwill


Goodwill
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312010-12-312009-12-31
Value6464646464646464646464646552520.00.022
Percentage of Goodwill100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.0100.0
Percentage of Assets3.03.03.03.13.13.13.03.23.33.33.33.33.52.82.90.00.01.5

Intangible Assets Net Excluding Goodwill

us-gaap:IntangibleAssetsNetExcludingGoodwill

us-gaap:IntangibleAssetsNetExcludingGoodwill


Intangible
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312010-12-312009-12-31
Value3334242526272728293031323327280.00.044
Percentage of IntangibleAssetsNetExcludingGoodwill100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.0100.0
Percentage of Assets1.61.61.11.21.31.31.31.41.51.61.61.71.81.51.50.00.02.9

Finite Lived Intangible Assets Net

us-gaap:FiniteLivedIntangibleAssetsNet

us-gaap:FiniteLivedIntangibleAssetsNet


Finite
Period End2020-12-312019-12-312018-12-312018-09-302017-12-31
Value2427313228
Percentage of FiniteLivedIntangibleAssetsNet100.0100.0100.0100.0100.0
Percentage of Assets1.11.31.61.71.5

Operating Lease Right Of Use Asset

us-gaap:OperatingLeaseRightOfUseAsset

us-gaap:OperatingLeaseRightOfUseAsset


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value36373838394142414245
Percentage of OperatingLeaseRightOfUseAsset100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets1.71.81.81.91.92.02.02.02.22.3

Other Assets Noncurrent

us-gaap:OtherAssetsNoncurrent

us-gaap:OtherAssetsNoncurrent


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value3331323237333032333234333318181716161516131415171716161313141011101114232321202115161418
Percentage of OtherAssetsNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets1.51.51.51.61.81.61.41.61.71.71.71.71.81.01.01.01.01.00.91.00.90.91.01.11.11.11.10.90.91.00.80.80.80.81.11.81.91.61.61.61.21.21.11.2

Equity Securities Fv Ni

us-gaap:EquitySecuritiesFvNi us-gaap:FinancialInstrument

us-gaap:EquitySecuritiesFvNi

seic:EquitiesAndOtherMutualFunds


Equity
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value5.1695.0374.8944.5144.2023.6514.4694.1424.1113.9893.56
Percentage of EquitySecuritiesFvNi100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.20.20.20.20.20.20.20.20.20.20.2
Percentage of Assets seic:EquitiesAndOtherMutualFunds0.00.00.00.00.00.00.00.00.00.00.0

seic:SEISponsoredMutualFunds


Equity
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value7.5627.3187.2486.5796.9926.3827.657.1717.2317.1226.658
Percentage of EquitySecuritiesFvNi146.3145.3148.1145.7166.4174.8171.2173.1175.9178.5187.0
Percentage of Assets0.40.30.30.30.30.30.40.40.40.40.3
Percentage of Assets seic:SEISponsoredMutualFunds0.00.00.00.00.00.00.00.00.00.00.0

Accounts Payable Current

us-gaap:AccountsPayableCurrent

us-gaap:AccountsPayableCurrent


Accounts
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value9.2915.5297.7661310134.4238.7125.4945.242109.1617.5198.4635.2684.4295.4077.3725.9667.0083.5414.3544.5114.0026.1396.05106.5128.478.373167.2751.8026.617113.5673.852.2411.9996.9042.8552.7414.5822.851
Percentage of AccountsPayableCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.40.30.40.60.50.60.20.40.30.30.60.50.40.40.30.30.30.50.40.40.20.30.30.30.40.40.70.40.60.61.10.50.10.50.90.30.30.20.20.50.20.20.30.2

Accrued Income Taxes Current

us-gaap:AccruedIncomeTaxesCurrent

us-gaap:AccruedIncomeTaxesCurrent


Accrued
Period End2021-03-312020-12-312020-06-302020-03-312019-12-312019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-03-312016-12-312016-09-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312013-09-302013-06-302013-03-312012-12-312012-03-312011-12-312011-09-302011-06-302010-12-31
Value333.50724232.01286.5591114195.583363.7219.39383.5058.9083.835383.2720.02618380.104180.00.00.02.077
Percentage of AccruedIncomeTaxesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.00.0100.0
Percentage of Assets1.50.21.21.10.11.50.30.60.81.00.32.20.20.62.50.20.60.32.50.20.01.42.90.01.40.00.00.00.2

Accrued Liabilities Current

us-gaap:AccruedLiabilitiesCurrent

us-gaap:AccruedLiabilitiesCurrent


Accrued
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value211199299223210179272193178173279207193168265185170167240170145165217153131152207148138141188136128140138121100115147104101121121152
Percentage of AccruedLiabilitiesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets9.99.313.810.710.38.712.79.59.18.914.210.710.38.914.310.610.410.314.710.99.610.613.79.98.610.013.410.09.69.813.19.89.510.510.69.18.08.911.48.17.68.88.810.0

Contract With Customer Liability Current

us-gaap:ContractWithCustomerLiabilityCurrent

us-gaap:ContractWithCustomerLiabilityCurrent


Contract
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value1280000.01335000.01085000.05815000.06349000.05978000.07185000.05529000.04705000.04979000.05154000.05054000.05587000.04723000.0
Percentage of ContractWithCustomerLiabilityCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.10.10.10.30.30.30.30.30.20.30.30.30.30.3

Dividends Payable Current

us-gaap:DividendsPayableCurrent

us-gaap:DividendsPayableCurrent


Dividends
Period End2020-12-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312012-12-312012-09-302012-06-302012-03-312011-12-312010-12-31
Value530.00.0520.00.00.0500.00.00.0470.00.00.0440.00.00.0420.00.00.0400.00.00.0370.00.00.00.0260.0
Percentage of DividendsPayableCurrent100.00.00.0100.00.00.00.0100.00.00.00.0100.00.00.00.0100.00.00.00.0100.00.00.00.0100.00.00.00.0100.00.00.00.00.0100.00.0
Percentage of Assets2.50.00.02.40.00.00.02.60.00.00.02.50.00.00.02.70.00.00.02.70.00.00.02.60.00.00.02.60.00.00.00.02.00.0

Liabilities Current

us-gaap:LiabilitiesCurrent

us-gaap:LiabilitiesCurrent


Liabilities
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value232215317250236207293216196192295221206182275192178176249180152172224161144163221158149153207145131148152126105118151132104125127163
Percentage of LiabilitiesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets10.910.014.612.011.510.113.610.610.19.915.011.410.99.614.811.010.910.915.211.510.011.114.110.59.510.714.310.710.410.714.510.49.711.111.69.58.39.211.710.27.99.19.310.6

us-gaap:LiabilitiesCurrent us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, us-gaap:EquityMethodInvestmentNonconsolidatedInvestee

seic:LSVAssetManagement, us-gaap:EquityMethodInvestmentNonconsolidatedInvesteeOrGroupOfInvestees


Liabilities
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value554077655546
Percentage of LiabilitiesCurrent23.918.624.326.023.716.0
Percentage of Assets2.61.93.63.12.72.2
Percentage of Assets seic:LSVAssetManagement us-gaap:EquityMethodInvestmentNonconsolidatedInvesteeOrGroupOfInvestees41.730.749.559.246.731.3

Operating Lease Liability Current

us-gaap:OperatingLeaseLiabilityCurrent

us-gaap:OperatingLeaseLiabilityCurrent


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value109.8138.5798.4458.2858.7159.1567.8888.2598.448
Percentage of OperatingLeaseLiabilityCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.50.50.40.40.40.40.40.40.40.4

Other Accrued Liabilities Current

us-gaap:OtherAccruedLiabilitiesCurrent

us-gaap:OtherAccruedLiabilitiesCurrent


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value353550485141484646375750464556535040503636424623192736263131222120212725222523222323
Percentage of OtherAccruedLiabilitiesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets1.71.62.32.32.52.02.32.32.41.92.92.62.52.43.13.13.12.53.12.32.42.82.91.51.21.82.41.82.22.21.61.61.51.62.11.91.82.01.81.71.71.7

Liabilities Noncurrent

us-gaap:LiabilitiesNoncurrent us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, us-gaap:EquityMethodInvestmentNonconsolidatedInvestee

us-gaap:LiabilitiesNoncurrent

seic:LSVAssetManagement, us-gaap:EquityMethodInvestmentNonconsolidatedInvesteeOrGroupOfInvestees


Liabilities
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value4249000.04435000.04620000.04802000.04980000.05326000.0
Percentage of LiabilitiesNoncurrent100.0100.0100.0100.0100.0100.0
Percentage of Assets0.20.20.20.20.20.2
Percentage of Assets seic:LSVAssetManagement us-gaap:EquityMethodInvestmentNonconsolidatedInvesteeOrGroupOfInvestees3.23.43.04.44.23.6

Deferred Income Tax Liabilities Net

us-gaap:DeferredIncomeTaxLiabilitiesNet

us-gaap:DeferredIncomeTaxLiabilitiesNet


Deferred
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302018-12-312017-12-31
Value47505547505352565545
Percentage of DeferredIncomeTaxLiabilitiesNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets2.22.42.52.32.42.62.52.82.82.5

Other Liabilities Noncurrent

us-gaap:OtherLiabilitiesNoncurrent

us-gaap:OtherLiabilitiesNoncurrent


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-31
Value2121202222242426252424262612100.0
Percentage of OtherLiabilitiesNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0
Percentage of Assets1.01.00.91.11.11.21.11.31.31.31.21.31.40.70.60.0

Operating Lease Liability Noncurrent

us-gaap:OperatingLeaseLiabilityNoncurrent

us-gaap:OperatingLeaseLiabilityNoncurrent


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value31333434353738373941
Percentage of OperatingLeaseLiabilityNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets1.51.51.61.71.71.81.81.92.02.1

Lessee Operating Lease Liability Payments Due Year Two

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo


Lessee
Period End2020-12-31
Value8917000.0
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearTwo100.0
Percentage of Assets0.4

Lessee Operating Lease Liability Payments Due Year Three

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree


Lessee
Period End2020-12-31
Value8922000.0
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearThree100.0
Percentage of Assets0.4

Lessee Operating Lease Liability Payments Due Year Four

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour


Lessee
Period End2020-12-31
Value7252000.0
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearFour100.0
Percentage of Assets0.3

Lessee Operating Lease Liability Payments Due Year Five

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFive

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFive


Lessee
Period End2020-12-31
Value5184000.0
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearFive100.0
Percentage of Assets0.2

Lessee Operating Lease Liability Payments Due After Year Five

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive


Lessee
Period End2020-12-31
Value5988000.0
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive100.0
Percentage of Assets0.3

Operating Lease Liability

us-gaap:OperatingLeaseLiability

us-gaap:OperatingLeaseLiability


Operating
Period End2020-12-312019-12-312019-09-302019-06-302019-03-31
Value4247454750
Percentage of OperatingLeaseLiability100.0100.0100.0100.0100.0
Percentage of Assets2.02.22.22.42.6

Lessee Operating Lease Liability Payments Due

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDue

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDue


Lessee
Period End2020-12-31
Value45
Percentage of LesseeOperatingLeaseLiabilityPaymentsDue100.0
Percentage of Assets2.1

Lessee Operating Lease Liability Undiscounted Excess Amount

us-gaap:LesseeOperatingLeaseLiabilityUndiscountedExcessAmount

us-gaap:LesseeOperatingLeaseLiabilityUndiscountedExcessAmount


Lessee
Period End2020-12-31
Value2809000.0
Percentage of LesseeOperatingLeaseLiabilityUndiscountedExcessAmount100.0
Percentage of Assets0.1

Stockholders Equity

us-gaap:StockholdersEquity

us-gaap:StockholdersEquity


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value180518291739172917081734173817031634163615931630159014761156116611261101103810811040105410251053107010771041909
Percentage of StockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets84.485.080.382.983.284.380.883.583.783.880.884.184.179.780.383.883.682.079.381.282.281.579.280.880.478.275.659.3

us-gaap:StockholdersEquity us-gaap:StatementEquityComponents

us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302018-12-312017-12-312016-12-31
Value1.1481.2611.5511.6221.9261.6960.4650.494-1.413-0.386-0.836
Percentage of StockholdersEquity0.10.10.10.10.10.10.00.0-0.1-0.00.0
Percentage of Assets0.10.10.10.10.10.10.00.0-0.1-0.0-0.1
Percentage of Assets us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss0.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedOtherComprehensiveIncome


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-312016-12-31
Value-14.522-15.403-16.798-27.398-34.179-35.348-23.504-35.78-30.74-28.72-33.0-28.863-28.221-19.908-37.955
Percentage of StockholdersEquity-0.8-0.8-1.0-1.6-2.0-2.0-1.4-2.1-1.9-1.8-2.1-1.8-1.8-1.30.0
Percentage of Assets-0.7-0.7-0.8-1.3-1.7-1.7-1.1-1.8-1.6-1.5-1.7-1.5-1.5-1.1-2.3
Percentage of Assets us-gaap:AccumulatedOtherComprehensiveIncome0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedTranslationAdjustment


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302018-12-312017-12-312016-12-31
Value-15.67-16.664-18.349-29.02-36.105-37.044-23.969-36.274-31.587-19.522-37.119
Percentage of StockholdersEquity-0.9-0.9-1.1-1.7-2.1-2.1-1.4-2.1-2.0-1.30.0
Percentage of Assets-0.7-0.8-0.8-1.4-1.8-1.8-1.1-1.8-1.6-1.1-2.3
Percentage of Assets us-gaap:AccumulatedTranslationAdjustment0.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AdditionalPaidInCapital


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-312016-12-31
Value12191208119011741174117011581137112211111106110110941027955
Percentage of StockholdersEquity67.566.168.467.968.767.566.766.868.667.969.567.568.869.60.0
Percentage of Assets57.056.254.956.357.256.953.955.757.556.956.156.857.955.558.4
Percentage of Assets us-gaap:AdditionalPaidInCapital0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:CommonStock


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-312016-12-31
Value1.411.4271.4341.4451.4641.4791.4971.5021.5091.5231.5361.5551.5681.5711.59
Percentage of StockholdersEquity0.10.10.10.10.10.10.10.10.10.10.10.10.10.10.0
Percentage of Assets0.10.10.10.10.10.10.10.10.10.10.10.10.10.10.1
Percentage of Assets us-gaap:CommonStock0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:RetainedEarnings


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-312016-12-31
Value599634565581566597601599541552517556522467384
Percentage of StockholdersEquity33.234.732.533.633.234.534.635.233.133.832.534.132.931.70.0
Percentage of Assets28.029.526.127.927.629.028.029.427.728.326.328.727.625.223.5
Percentage of Assets us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Common Stock Value

us-gaap:CommonStockValue

us-gaap:CommonStockValue


Common
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value1410000.01427000.01434000.01445000.01464000.01479000.01497000.01502000.01509000.01523000.01536000.01555000.01568000.01580000.01571000.01574000.01580000.01587000.01590000.01600000.01612000.01619000.01637000.01646000.01659000.01661000.01667000.01671000.01677000.01691000.01692000.01705000.01715000.01723000.01722000.01729000.01734000.01755000.01765000.01796000.01832000.01851000.01861000.01902000.0
Percentage of CommonStockValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.1

Additional Paid In Capital Common Stock

us-gaap:AdditionalPaidInCapitalCommonStock

us-gaap:AdditionalPaidInCapitalCommonStock


Additional
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value1219120811901174117411701158113711221111110611011094108510271002988976955941933912910892882854834805772758721700678652624604588587577581585576565522
Percentage of AdditionalPaidInCapitalCommonStock100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets57.056.254.956.357.256.953.955.757.556.956.156.857.957.355.557.360.560.158.459.861.458.857.357.857.856.254.154.253.852.750.150.350.348.647.745.446.545.544.644.644.041.841.134.0

Retained Earnings Accumulated Deficit

us-gaap:RetainedEarningsAccumulatedDeficit

us-gaap:RetainedEarningsAccumulatedDeficit


Retained
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value599634565581566597601599541552517556522544467448409420384400380408402435435445420440425444431462448445405468447460443470475493471384
Percentage of RetainedEarningsAccumulatedDeficit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets28.029.526.127.927.629.028.029.427.728.326.328.727.628.825.225.625.125.923.525.525.026.425.428.228.629.327.229.729.630.930.033.233.333.231.035.235.435.634.336.135.735.834.225.1

Accumulated Other Comprehensive Income Loss Net Of Tax

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax


Accumulated
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-312008-12-31
Value-14522000.0-15403000.0-16798000.0-27398000.0-34179000.0-35348000.0-23504000.0-35780000.0-30740000.0-28720000.0-33000000.0-28863000.0-28221000.0-18161000.0-19908000.0-20298000.0-28015000.0-35513000.0-37955000.0-30538000.0-27427000.0-22344000.0-25290000.0-20346000.0-13692000.0-17765000.0-8895000.0-2995000.03821000.014000.01487000.01556000.0-1999000.01283000.06239000.05693000.02137000.04091000.01900000.0387000.07042000.05292000.03157000.01258000.0-8163000.0
Percentage of AccumulatedOtherComprehensiveIncomeLossNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets-0.7-0.7-0.8-1.3-1.7-1.7-1.1-1.8-1.6-1.5-1.7-1.5-1.5-1.0-1.1-1.2-1.7-2.2-2.3-1.9-1.8-1.4-1.6-1.3-0.9-1.2-0.6-0.20.30.00.10.1-0.10.10.50.40.20.30.10.00.50.40.20.10.0

Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value

us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue

us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue


Adjustments
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value109.7526.4677.0626.9295.4535.0645.0385.8785.3235.195
Percentage of AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital


Adjustments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value109.7526.5566.4677.0626.9299.0275.4535.0645.0387.4095.8785.3235.195
Percentage of AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue100.0100.00.0100.0100.0100.00.0100.0100.0100.00.0100.0100.0100.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets us-gaap:AdditionalPaidInCapital0.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Net Cash Provided By Used In Operating Activities

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetCashProvidedByUsedInOperatingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value1881369213216598163163157591701551581041431311117314112481781161177877133979943110116833911170353981823458108624018
Percentage of NetCashProvidedByUsedInOperatingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax39.630.020.831.241.223.938.739.438.514.942.137.939.225.735.234.130.020.338.435.023.723.334.935.123.323.941.530.431.114.537.141.730.514.542.728.114.916.536.035.514.525.146.928.417.78.2

Net Cash Provided By Used In Investing Activities

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:NetCashProvidedByUsedInInvestingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-25.431-30.656-3.253-26.85-20.041-17.352-35.135-12.739-14.58-15.726-45.962-13.499-48.533-15.376-24.239-101.182-21.536-25.345-12.525-35.09-24.498-7.472-21.132-22.824-23.739-10.32-7.404-12.245-19.133-14.603-12.473-35.92517-31.99851-6.572-8.343-19.855-16.799-16.492-5.1866.5270.956-6.73611-47.409
Percentage of NetCashProvidedByUsedInInvestingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-5.3-6.7-0.7-6.3-5.0-4.2-8.3-3.1-3.6-3.9-11.3-3.3-12.0-3.8-5.9-26.2-5.8-7.0-3.4-9.9-7.1-2.2-6.3-6.8-7.0-3.2-2.3-3.8-6.0-4.8-4.2-12.86.5-11.819.6-2.6-3.5-8.3-7.4-7.1-2.22.80.4-3.15.1-21.4

Net Cash Provided By Used In Financing Activities

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:NetCashProvidedByUsedInFinancingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-168.424-109.512-80.302-102.469-134.314-165.05-64.878-61.873-127.225-132.644-107.506-92.482-156.447-87.285-59.903-11.929-97.498-84.303-51.287-58.385-96.067-113.949-60.314-66.926-77.33-85.235-29.477-39.911-93.302-62.06-47.397-40.901-66.862-7.625-108.418-14.031-68.179-52.228-72.506-79.65-85.046-63.116-64.923-65.673-90.933-60.907
Percentage of NetCashProvidedByUsedInFinancingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-35.4-24.0-18.1-24.1-33.5-39.8-15.3-14.9-31.1-33.1-26.5-22.6-38.6-21.5-14.7-3.1-26.2-23.4-13.9-16.5-27.9-34.1-18.0-19.9-22.9-26.2-9.1-12.4-29.3-20.5-15.9-14.6-24.4-2.8-41.4-5.6-28.3-22.0-32.0-34.2-35.8-27.1-28.1-29.9-39.8-27.5

Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect


Cash
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value-4.404-2.044169.42211-94.576738512-85.1991248-54.8554.0545924-1.008-34.329
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-0.9-0.43.82.22.8-22.817.420.43.2-21.33.111.9-13.61.014.56.4-0.3-9.5

Increase Decrease In Accounts Payable

us-gaap:IncreaseDecreaseInAccountsPayable

us-gaap:IncreaseDecreaseInAccountsPayable


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value3762000.0-2237000.0-5272000.02258000.0-2306000.08663000.0-4289000.03218000.0252000.0-5678000.01759000.01642000.0-944000.03195000.0839000.0581000.0-3735000.01406000.0-1042000.03467000.0-813000.0-157000.0509000.0-2137000.089000.0-3902000.03440000.0-1958000.097000.0-7862000.08960000.05473000.0-4815000.0-4618000.07681000.0-283000.01609000.0242000.0-4905000.04049000.0114000.0-1841000.0-644000.04152000.0
Percentage of IncreaseDecreaseInAccountsPayable100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Net Cash Provided By Used In Operating Activities

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetCashProvidedByUsedInOperatingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value1881369213216598163163157591701551581041431311117314112481781161177877133979943110116833911170353981823458108624018
Percentage of NetCashProvidedByUsedInOperatingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax39.630.020.831.241.223.938.739.438.514.942.137.939.225.735.234.130.020.338.435.023.723.334.935.123.323.941.530.431.114.537.141.730.514.542.728.114.916.536.035.514.525.146.928.417.78.2

Net Income Loss

us-gaap:NetIncomeLoss

us-gaap:NetIncomeLoss


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value133129125111101109128132126113116128121139817986847783827465678371565049494449535762565359
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax28.128.428.426.125.226.330.431.830.928.428.631.430.134.524.323.725.526.023.926.126.024.721.923.930.426.521.620.220.521.019.621.122.524.827.025.723.426.8

us-gaap:NetIncomeLoss us-gaap:StatementEquityComponents

us-gaap:RetainedEarnings


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value133129125111101109128132126113116128121139
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax28.128.428.426.125.226.330.431.830.928.428.631.430.134.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Profit Loss

us-gaap:ProfitLoss us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, us-gaap:EquityMethodInvestmentNonconsolidatedInvestee

us-gaap:ProfitLoss

seic:LSVAssetManagement, us-gaap:EquityMethodInvestmentNonconsolidatedInvesteeOrGroupOfInvestees


Profit
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value9085817072761009697
Percentage of ProfitLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax19.018.918.416.618.218.523.823.223.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax seic:LSVAssetManagement us-gaap:EquityMethodInvestmentNonconsolidatedInvesteeOrGroupOfInvestees0.00.00.00.00.00.00.00.00.0

Net Cash Provided By Used In Investing Activities

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:NetCashProvidedByUsedInInvestingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-25.431-30.656-3.253-26.85-20.041-17.352-35.135-12.739-14.58-15.726-45.962-13.499-48.533-15.376-24.239-101.182-21.536-25.345-12.525-35.09-24.498-7.472-21.132-22.824-23.739-10.32-7.404-12.245-19.133-14.603-12.473-35.92517-31.99851-6.572-8.343-19.855-16.799-16.492-5.1866.5270.956-6.73611-47.409
Percentage of NetCashProvidedByUsedInInvestingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-5.3-6.7-0.7-6.3-5.0-4.2-8.3-3.1-3.6-3.9-11.3-3.3-12.0-3.8-5.9-26.2-5.8-7.0-3.4-9.9-7.1-2.2-6.3-6.8-7.0-3.2-2.3-3.8-6.0-4.8-4.2-12.86.5-11.819.6-2.6-3.5-8.3-7.4-7.1-2.22.80.4-3.15.1-21.4

Payments To Acquire Property Plant And Equipment

us-gaap:PaymentsToAcquirePropertyPlantAndEquipment

us-gaap:PaymentsToAcquirePropertyPlantAndEquipment


Payments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value114.218118.67113201212107.3177.4438.9817.065.6115.207107.0423.2054.741174.444.6098.746198.3417.3862.0477.79117.6275.9386.8491.821.7441.4195.3074.228121.5273.771-0.3957.3682.0434.3672.664.541
Percentage of PaymentsToAcquirePropertyPlantAndEquipment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Net Cash Provided By Used In Financing Activities

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:NetCashProvidedByUsedInFinancingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-168.424-109.512-80.302-102.469-134.314-165.05-64.878-61.873-127.225-132.644-107.506-92.482-156.447-87.285-59.903-11.929-97.498-84.303-51.287-58.385-96.067-113.949-60.314-66.926-77.33-85.235-29.477-39.911-93.302-62.06-47.397-40.901-66.862-7.625-108.418-14.031-68.179-52.228-72.506-79.65-85.046-63.116-64.923-65.673-90.933-60.907
Percentage of NetCashProvidedByUsedInFinancingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-35.4-24.0-18.1-24.1-33.5-39.8-15.3-14.9-31.1-33.1-26.5-22.6-38.6-21.5-14.7-3.1-26.2-23.4-13.9-16.5-27.9-34.1-18.0-19.9-22.9-26.2-9.1-12.4-29.3-20.5-15.9-14.6-24.4-2.8-41.4-5.6-28.3-22.0-32.0-34.2-35.8-27.1-28.1-29.9-39.8-27.5

Payments Of Dividends

us-gaap:PaymentsOfDividends

us-gaap:PaymentsOfDividends


Payments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value52530.00.051520.00.049500.00.047470.00.044440.00.0641420.00.039400.00.03836370.00.0340.0820.026260.00.0220.0180.01817
Percentage of PaymentsOfDividends100.0100.00.00.0100.0100.00.00.0100.0100.00.00.0100.0100.00.00.0100.0100.00.0100.0100.0100.00.00.0100.0100.00.0100.0100.0100.00.00.0100.00.0100.00.0100.0100.00.00.0100.00.0100.00.0100.0100.0

Payments For Repurchase Of Common Stock

us-gaap:PaymentsForRepurchaseOfCommonStock

us-gaap:PaymentsForRepurchaseOfCommonStock


Payments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value12671991078813083799290116101101876164655667697778787965676075746562575134453044365460543934373017
Percentage of PaymentsForRepurchaseOfCommonStock100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Debt Instrument Interest Rate Stated Percentage

us-gaap:DebtInstrumentInterestRateStatedPercentage us-gaap:CreditFacility, us-gaap:DebtInstrument

us-gaap:DebtInstrumentInterestRateStatedPercentage

us-gaap:LineOfCredit, seic:A2021CreditFacility


Debt
Period End2021-04-23
Value0
Percentage of DebtInstrumentInterestRateStatedPercentage0.0
Percentage of LongTermDebtAndCapitalLeaseObligations0.0
Percentage of LongTermDebtAndCapitalLeaseObligations us-gaap:LineOfCredit seic:A2021CreditFacility0.0

us-gaap:DebtInstrumentInterestRateStatedPercentage us-gaap:CreditFacility, us-gaap:DebtInstrument, us-gaap:SubsequentEventType

us-gaap:LineOfCredit, seic:A2021CreditFacility, us-gaap:SubsequentEvent


Debt
Period End2021-04-23
Value0
Percentage of DebtInstrumentInterestRateStatedPercentage0.0
Percentage of LongTermDebtAndCapitalLeaseObligations0.0
Percentage of LongTermDebtAndCapitalLeaseObligations us-gaap:LineOfCredit seic:A2021CreditFacility us-gaap:SubsequentEvent0.0

Effective Income Tax Rate Continuing Operations

us-gaap:EffectiveIncomeTaxRateContinuingOperations

us-gaap:EffectiveIncomeTaxRateContinuingOperations


Effective
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value22.322.619.621.40.2330.2150.1950.1890.2210.2210.1920.1860.2110.1190.1990.2770.3210.310.3340.3380.3520.3520.2930.3410.3560.3540.3330.3470.3570.3590.3520.2850.3550.3490.350.390.3660.3720.3470.3380.3470.3710.370.3780.3780.379
Percentage of EffectiveIncomeTaxRateContinuingOperations100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber


Share
Period End2021-06-302021-03-312020-12-312020-09-302019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-31
Value171718141515161819202325272728
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber us-gaap:ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRange

seic:FifthRangeOfExercisePrices


Share
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value5.7895.9873.8384.196.1614.0814.3824.1884.4224.644
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber31.338.124.325.134.121.221.417.717.317.2

seic:FirstRangeOfExercisePrices


Share
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value0.6650.8431.9962.1783.0213.5134.0735.4985.0655.285
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber3.65.412.613.016.718.319.923.319.819.5

seic:FourthRangeOfExercisePrices


Share
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value8.3984.0624.2681.8153.3215.5154.0734.9795.1435.375
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber45.425.927.010.918.428.719.921.120.119.9

seic:SecondRangeOfExercisePrices


Share
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value0.9441.8692.3791.1741.8542.13.5344.9215.9995.179
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber5.111.915.07.010.310.917.320.823.419.2

seic:ThirdRangeOfExercisePrices


Share
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value2.6992.9453.3323.4323.7124.0284.3994.0514.9816.56
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber14.618.821.120.520.520.921.517.119.424.3

Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice


Share
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-31
Value51.1547.4341.8437.6331.5728.7125.2622.5820.8120.0620.4220.09
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice us-gaap:ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRange

seic:FifthRangeOfExercisePrices


Share
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value49.7663.4362.6945.4947.9146.8837.133.1530.8830.88
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice97.3133.7149.8120.9151.8163.3146.9146.8148.4153.9

seic:FirstRangeOfExercisePrices


Share
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value15.7915.7916.6315.4515.2715.2315.1915.1314.6914.65
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice30.933.339.741.148.453.060.167.070.673.0

seic:FourthRangeOfExercisePrices


Share
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value62.5749.0149.0133.6533.1832.0830.9526.5723.1922.75
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice122.3103.3117.189.4105.1111.7122.5117.7111.4113.4

seic:SecondRangeOfExercisePrices


Share
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value22.4523.0423.1317.6717.6717.6718.218.2716.8715.3
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice43.948.655.347.056.061.572.180.981.176.3

seic:ThirdRangeOfExercisePrices


Share
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value37.3537.2437.123.1923.223.223.222.0820.3718.33
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice73.078.588.761.673.580.891.897.897.991.4

Deferred Tax Liabilities

us-gaap:DeferredTaxLiabilities

us-gaap:DeferredTaxLiabilities


Deferred
Period End2020-12-312019-12-312019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value525555565760565448696969694848689192
Percentage of DeferredTaxLiabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Deferred Tax Assets Net

us-gaap:DeferredTaxAssetsNet

us-gaap:DeferredTaxAssetsNet


Deferred
Period End2020-12-312019-12-312018-12-312017-12-31
Value40373436
Percentage of DeferredTaxAssetsNet100.0100.0100.0100.0

Unrecognized Tax Benefits

us-gaap:UnrecognizedTaxBenefits

us-gaap:UnrecognizedTaxBenefits


Unrecognized
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-312009-12-312008-12-31
Value19181518191815161716141516151417201917171616141616151414131312131112111212129.41118.1036.4124.98913
Percentage of UnrecognizedTaxBenefits100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Deferred Tax Assets Valuation Allowance

us-gaap:DeferredTaxAssetsValuationAllowance us-gaap:IncomeTaxAuthority

us-gaap:DeferredTaxAssetsValuationAllowance

us-gaap:ForeignCountry


Deferred
Period End2020-12-312019-12-312018-12-31
Value6.5475.9946.446
Percentage of DeferredTaxAssetsValuationAllowance100.0100.0100.0

us-gaap:StateAndLocalJurisdiction


Deferred
Period End2020-12-312019-12-312018-12-31
Value626465
Percentage of DeferredTaxAssetsValuationAllowance950.51080.01021.9

seic:CapitalizedContractCostAmountCapitalizedDuringPeriod

seic:CapitalizedContractCostAmountCapitalizedDuringPeriod


Capitalized
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value1.6742.3723.0142.5211.7522.9973.8224.5751.951.1262.6391.42.2671.816
Percentage of CapitalizedContractCostAmountCapitalizedDuringPeriod100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

seic:CapitalizedContractCostsNetOfAmortization

seic:CapitalizedContractCostsNetOfAmortization


Capitalized
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value-78000.0-351000.0-52000.0725000.0348000.01769000.02485000.03374000.0987000.0138000.01903000.0583000.01646000.01234000.00
Percentage of CapitalizedContractCostsNetOfAmortization100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0

seic:CompensationBenefitsAndOtherPersonnel

seic:CompensationBenefitsAndOtherPersonnel


Compensation
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value141137134125131130898688908580787471727170646767
Percentage of CompensationBenefitsAndOtherPersonnel100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

seic:EffectiveIncomeTaxRateReconciliationExpirationOfTheStatuteOfLimitationsPercent

seic:EffectiveIncomeTaxRateReconciliationExpirationOfTheStatuteOfLimitationsPercent


Effective
Period End2020-09-302019-09-30
Value-1.3-1.2
Percentage of EffectiveIncomeTaxRateReconciliationExpirationOfTheStatuteOfLimitationsPercent100.0100.0

seic:EffectiveIncomeTaxRateReconciliationProvisionToReturnAdjustmentsPercent

seic:EffectiveIncomeTaxRateReconciliationProvisionToReturnAdjustmentsPercent


Effective
Period End2020-09-302019-09-30
Value-0.4-0.6
Percentage of EffectiveIncomeTaxRateReconciliationProvisionToReturnAdjustmentsPercent100.0100.0

seic:LineOfCreditFacilityConditionalIncreaseDecreaseNet us-gaap:CreditFacility, us-gaap:DebtInstrument

seic:LineOfCreditFacilityConditionalIncreaseDecreaseNet

us-gaap:LineOfCredit, seic:A2021CreditFacility


Line
Period End2021-04-23
Value100
Percentage of LineOfCreditFacilityConditionalIncreaseDecreaseNet100.0

seic:LineOfCreditFacilityConditionalIncreaseDecreaseNet us-gaap:CreditFacility, us-gaap:DebtInstrument, us-gaap:SubsequentEventType

us-gaap:LineOfCredit, seic:A2021CreditFacility, us-gaap:SubsequentEvent


Line
Period End2021-04-23
Value100
Percentage of LineOfCreditFacilityConditionalIncreaseDecreaseNet100.0

seic:SoftwareRoyaltiesAndOtherInformationProcessingCosts

seic:SoftwareRoyaltiesAndOtherInformationProcessingCosts


Software
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value7.4715.7426.9927.3897.4477.1987.5417.8847.4878.8326.1855.2286.4776.5296.7037.1887.0175.9236.0486.3746.074
Percentage of SoftwareRoyaltiesAndOtherInformationProcessingCosts100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

seic:SubadvisoryDistributionAndOtherAssetManagementCosts

seic:SubadvisoryDistributionAndOtherAssetManagementCosts


Subadvisory
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value555045444544312927252625282524262614252425
Percentage of SubadvisoryDistributionAndOtherAssetManagementCosts100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AdjustmentForAmortization

us-gaap:AdjustmentForAmortization


Adjustment
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value14141313131313121212121212119.9431312121111111110101010109.8139.5849.2149.1048.8298.4278.2427.845107.4077.6227.2577.0086.7926.2316.1535.9985.9975.9
Percentage of AdjustmentForAmortization100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AdjustmentForAmortization us-gaap:ConsolidationItems

us-gaap:CorporateNonSegment


Adjustment
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value0.1250.0580.0580.0570.0580.0570.0590.0570.0560.0580.0580.0580.0570.0580.0670.050.050.05
Percentage of AdjustmentForAmortization0.80.40.40.40.40.40.50.40.40.50.50.50.50.50.70.40.40.4

us-gaap:OperatingSegments


Adjustment
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value14141313131312121212121212119.876131211
Percentage of AdjustmentForAmortization99.299.699.699.699.699.699.599.699.699.599.599.599.599.599.399.699.699.6

us-gaap:AdjustmentForAmortization us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, seic:InstitutionalInvestors


Adjustment
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value0.4270.4260.4270.4260.4270.4270.4260.440.4270.4330.4260.4270.4270.4270.4250.4250.4260.323
Percentage of AdjustmentForAmortization2.93.03.13.23.23.33.33.43.33.43.43.43.53.64.33.13.42.7

us-gaap:OperatingSegments, seic:InvestmentAdvisors


Adjustment
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value2.9092.6272.6952.6832.6642.6522.6292.6092.552.5232.4652.4452.4012.3572.212.9732.8972.85
Percentage of AdjustmentForAmortization19.818.319.920.320.320.320.220.220.019.919.819.719.719.922.221.623.123.7

us-gaap:OperatingSegments, seic:InvestmentManagers


Adjustment
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value2.4442.482.3452.3432.3422.3352.3392.3342.3462.3392.3462.3462.3452.3450.971.1320.2750.216
Percentage of AdjustmentForAmortization16.617.317.317.817.817.918.018.018.418.418.818.919.319.89.88.22.21.8

us-gaap:OperatingSegments, seic:InvestmentsInNewBusinesses


Adjustment
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value0.1850.1850.1830.1860.1850.1850.1850.1850.1850.1850.1850.1860.1840.040.0390.040.0410.119
Percentage of AdjustmentForAmortization1.31.31.31.41.41.41.41.41.41.51.51.51.50.30.40.30.31.0

us-gaap:OperatingSegments, seic:PrivateBank


Adjustment
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value8.6338.5767.857.5057.4647.4217.3747.3227.2177.1416.9956.9436.7476.6276.2329.1258.8768.464
Percentage of AdjustmentForAmortization58.659.857.956.956.856.756.756.656.556.356.156.055.555.962.766.470.670.4

us-gaap:AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities

us-gaap:AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities


Adjustments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value547.103-33.7242164-10.27343131-54.082542637-35.664212920-15.72553370.4240.5243538-7.386-6.681561316-30.87845490.345-32.7955419-13.85-11.0113633-19.6090.296455.537-13.352-41.758
Percentage of AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AllocatedShareBasedCompensationExpenseNetOfTax

us-gaap:AllocatedShareBasedCompensationExpenseNetOfTax


Allocated
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value8.1997.8985.3065.2385.7445.5487.1724.4114.0934.0925.8874.5674.1814.092154.5714.074.0272.5962.62.722.493.8132.4422.5072.4422.552.4641.9331.8126.9536.9726.743.3772.692.3062.4892.5121.9282.1352.3832.3346.5062.1553.911
Percentage of AllocatedShareBasedCompensationExpenseNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AmortizationOfDeferredCharges

us-gaap:AmortizationOfDeferredCharges


Amortization
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value1414131313121212121212119.9431312
Percentage of AmortizationOfDeferredCharges100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfNetIncomePerOutstandingUnitAmount

us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfNetIncomePerOutstandingUnitAmount


Antidilutive
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-31
Value57.7757.99-0.0657.9858.2658.761.1154.9154.7954.810.4553.3853.3352.737.7637.8137.6837.70.9534.1134.0634.053.9730.0230.0230.02-2.3732.3832.432.41.3231.3929.2228.051.3626.5122.7523.43
Percentage of AntidilutiveSecuritiesExcludedFromComputationOfNetIncomePerOutstandingUnitAmount100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:CapitalExpendituresIncurredButNotYetPaid

us-gaap:CapitalExpendituresIncurredButNotYetPaid


Capital
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value171014192719201718171818172523202131141415261615101519171415177.7926.52912132111139.487187.3481311
Percentage of CapitalExpendituresIncurredButNotYetPaid100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:CapitalExpendituresIncurredButNotYetPaid us-gaap:ConsolidationItems

us-gaap:CorporateNonSegment


Capital
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value0.4180.160.2740.7980.9970.6630.5860.3850.3730.460.3660.3080.2420.3770.3920.152
Percentage of CapitalExpendituresIncurredButNotYetPaid2.41.51.94.03.73.32.92.22.02.61.91.71.41.51.70.8

us-gaap:OperatingSegments


Capital
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value16101419261919161717181817242319
Percentage of CapitalExpendituresIncurredButNotYetPaid97.698.598.196.096.396.797.197.898.097.498.198.398.698.598.399.2

us-gaap:CapitalExpendituresIncurredButNotYetPaid us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, seic:InstitutionalInvestors


Capital
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value0.8840.5110.6981.0291.3581.071.0490.8710.9370.9620.9970.9670.8631.261.0860.811
Percentage of CapitalExpendituresIncurredButNotYetPaid5.24.84.75.25.05.45.25.05.15.45.35.24.95.04.64.0

us-gaap:OperatingSegments, seic:InvestmentAdvisors


Capital
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value3.582.3083.2343.8035.394.4684.5583.9474.1013.9274.2844.263.7995.4213.6984.532
Percentage of CapitalExpendituresIncurredButNotYetPaid20.921.821.919.219.922.422.622.922.422.122.823.021.521.415.822.6

us-gaap:OperatingSegments, seic:InvestmentManagers


Capital
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value3.3731.6312.7767.2599.0325.3114.8753.3493.6454.1043.372.522.1333.458.6651.615
Percentage of CapitalExpendituresIncurredButNotYetPaid19.715.418.836.633.326.724.219.419.923.117.913.612.113.636.98.0

us-gaap:OperatingSegments, seic:InvestmentsInNewBusinesses


Capital
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value0.3130.1390.1440.3320.4180.3790.3440.2410.2410.2870.240.2040.1140.1730.1530.106
Percentage of CapitalExpendituresIncurredButNotYetPaid1.81.31.01.71.51.91.71.41.31.61.31.10.60.70.70.5

us-gaap:OperatingSegments, seic:PrivateBank


Capital
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value8.5945.8297.6526.6349.9258.0188.7618.4618.9967.9999.5291010149.47912
Percentage of CapitalExpendituresIncurredButNotYetPaid50.155.151.833.436.640.343.449.049.245.150.755.459.557.940.464.0

us-gaap:CapitalizedComputerSoftwareAdditions

us-gaap:CapitalizedComputerSoftwareAdditions


Capitalized
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-30
Value5.9116.365.4796.1076.0756.4587.2537.6339.2519.937108.7581112121516161713109.4776.9086.4398.087.9898.6847.931
Percentage of CapitalizedComputerSoftwareAdditions100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:CapitalizedComputerSoftwareAdditions us-gaap:FiniteLivedIntangibleAssetsByMajorClass

seic:SeiWealthPlatform


Capitalized
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-30
Value5.9116.2615.0495.4235.5566.2297.0557.3368.9549.739108.75811121012121512118.4757.6455.1715.6956.3197.338.6847.9318.8549.4088.4568.858
Percentage of CapitalizedComputerSoftwareAdditions100.098.492.288.891.596.597.396.196.898.0100.0100.0100.093.486.282.578.090.072.182.983.780.774.988.478.291.8100.0100.00.00.00.00.0

us-gaap:CapitalizedComputerSoftwareAmortization1 us-gaap:FiniteLivedIntangibleAssetsByMajorClass

us-gaap:CapitalizedComputerSoftwareAmortization1

seic:SeiWealthPlatform


Capitalized
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value1111111010101010101010109.889.7199.1811212111111111010101010
Percentage of CapitalizedComputerSoftwareAmortization1100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:CapitalizedContractCostAmortization

us-gaap:CapitalizedContractCostAmortization


Capitalized
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value1752000.02723000.03066000.01796000.01404000.01228000.01337000.01223000.0963000.0988000.0736000.0819000.0619000.0582000.0
Percentage of CapitalizedContractCostAmortization100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DebtSecuritiesAvailableForSaleRealizedLoss us-gaap:FinancialInstrument

us-gaap:DebtSecuritiesAvailableForSaleRealizedLoss

us-gaap:FixedIncomeSecurities


Debt
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value229000.0327000.0320000.0302000.0152000.0128000.0146000.0120000.0118000.0109000.0
Percentage of DebtSecuritiesAvailableForSaleRealizedLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:Depreciation

us-gaap:Depreciation


Depreciation
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value8.4248.3097.9457.647.4737.4097.4227.3317.2777.2557.1387.1226.9646.9486.5996.86.9836.5766.4346.4476.0986.1085.8435.9955.9545.5795.3315.5845.4475.6165.735.7045.7635.7615.635.4325.1235.3465.3915.6115.515.6025.5845.206
Percentage of Depreciation100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:Depreciation us-gaap:ConsolidationItems

us-gaap:CorporateNonSegment


Depreciationus-gaap:
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value0.3490.3310.2550.2570.2560.320.3280.3360.30.3170.2970.2910.2870.2080.1820.146
Percentage of Depreciation4.14.03.23.43.44.34.44.64.14.44.24.14.13.02.82.1

us-gaap:OperatingSegments


Depreciationus-gaap:
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value8.0757.9787.697.3837.2177.0897.0946.9956.9776.9386.8416.8316.6776.746.4176.654
Percentage of Depreciation95.996.096.896.696.695.795.695.495.995.695.895.995.997.097.297.9

us-gaap:Depreciation us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, seic:InstitutionalInvestors


Depreciationus-gaap:
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value0.3530.3580.2980.3010.3020.3930.4140.4050.3620.410.4520.4480.4020.2480.2440.227
Percentage of Depreciation4.24.33.83.94.05.35.65.55.05.76.36.35.83.63.73.3

us-gaap:OperatingSegments, seic:InvestmentAdvisors


Depreciationus-gaap:
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value1.4171.2891.2551.1721.1511.1621.1651.1791.2291.1681.1051.1051.070.7590.8020.733
Percentage of Depreciation16.815.515.815.315.415.715.716.116.916.115.515.515.410.912.210.8

us-gaap:OperatingSegments, seic:InvestmentManagers


Depreciationus-gaap:
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value2.0272.0531.8181.8691.8121.7931.821.7711.5771.7961.8061.8091.5571.1971.0280.916
Percentage of Depreciation24.124.722.924.524.224.224.524.221.724.825.325.422.417.215.613.5

us-gaap:OperatingSegments, seic:InvestmentsInNewBusinesses


Depreciationus-gaap:
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value0.10.1460.0970.0760.070.1010.110.0910.1050.1370.1550.150.1250.1620.1710.368
Percentage of Depreciation1.21.81.21.00.91.41.51.21.41.92.22.11.82.32.65.4

us-gaap:OperatingSegments, seic:PrivateBank


Depreciationus-gaap:
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value4.1784.1324.2223.9653.8823.643.5853.5493.7043.4273.3233.3193.5234.3744.1724.41
Percentage of Depreciation49.649.753.151.951.949.148.348.450.947.246.646.650.663.063.264.9

us-gaap:DepreciationNonproduction

us-gaap:DepreciationNonproduction


Depreciation
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value8.4248.3097.9017.9457.647.4737.2747.4097.4227.3317.2777.2557.1387.1226.9646.9486.5996.86.9836.5766.4346.4476.0986.1085.8435.9955.9545.5795.3315.5845.4475.6165.735.704
Percentage of DepreciationNonproduction100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DividendsCommonStock

us-gaap:DividendsCommonStock


Dividends
Period End2021-06-302020-12-312020-09-302020-06-302019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302012-12-28
Value52530.051520.049500.04755
Percentage of DividendsCommonStock100.0100.00.0100.0100.00.0100.0100.00.0100.0100.0

us-gaap:DividendsCommonStock us-gaap:StatementEquityComponents

us-gaap:RetainedEarnings


Dividends
Period End2021-06-302020-12-312020-09-302020-06-302019-12-312019-09-302019-06-302018-12-312018-09-302018-06-30
Value52530.051520.049500.047
Percentage of DividendsCommonStock100.0100.00.0100.0100.00.0100.0100.00.0100.0

us-gaap:EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents

us-gaap:EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents


Effect
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value1.0271.5518.3256.3490.601-11.14610-4.155-2.9953.272
Percentage of EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential

us-gaap:EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential


Effective
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value-0.1-0.1-0.3-0.2-0.002-0.0010.002-0.003-0.001-0.0010.001-0.002-0.001-0.002-0.001-0.01-0.01-0.0080-0.008-0.007-0.007
Percentage of EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0

us-gaap:EffectiveIncomeTaxRateReconciliationOtherAdjustments

us-gaap:EffectiveIncomeTaxRateReconciliationOtherAdjustments


Effective
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value-0.6-0.30.6-0.6-0.004-0.0030.007-0.004-0.003-0.003-0.0030.002-0.001-0.0030.005-0.009-0.006-0.0050.009-0.008-0.005-0.005
Percentage of EffectiveIncomeTaxRateReconciliationOtherAdjustments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:EffectiveIncomeTaxRateReconciliationShareBasedCompensationExcessTaxBenefitPercent

us-gaap:EffectiveIncomeTaxRateReconciliationShareBasedCompensationExcessTaxBenefitPercent


Effective
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-31
Value-1.2-1.1-0.4-0.004-0.022-2.2-0.011-0.011
Percentage of EffectiveIncomeTaxRateReconciliationShareBasedCompensationExcessTaxBenefitPercent100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes

us-gaap:EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes


Effective
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value3.23.1-0.23.30.0330.031-0.0020.0260.0260.026-0.0040.0230.0230.022-0.0040.0170.0170.015-0.0020.0120.0140.014
Percentage of EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense

us-gaap:EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense


Employee
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value1.9041.8541.251.2291.3181.3811.8551.0420.9710.9461.5221.3111.1421.1031.0322.5172.1892.1531.3771.4661.4691.2992.0231.4251.3521.3081.4321.3220.9391.0113.9154.1253.8671.9161.2691.5731.3761.5211.2181.2891.4271.3983.8741.3132.367
Percentage of EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:EquityMethodInvestmentDividendsOrDistributions

us-gaap:EquityMethodInvestmentDividendsOrDistributions


Equity
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value39285.7133532521346443328484345264239352235323424423737343437312755252719242521302726232523
Percentage of EquityMethodInvestmentDividendsOrDistributions100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:EquityMethodInvestmentDividendsOrDistributions us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

seic:LSVAssetManagement


Equity
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value39285.71335325213464433284843452642393522353234244237373434373127552527
Percentage of EquityMethodInvestmentDividendsOrDistributions100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:EquitySecuritiesFvNiRealizedGain

us-gaap:EquitySecuritiesFvNiRealizedGain


Equity
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-06-302019-03-31
Value456000.0157000.0846000.058000.07000.0189000.013000.043000.0
Percentage of EquitySecuritiesFvNiRealizedGain100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:EquitySecuritiesFvNiRealizedLoss

us-gaap:EquitySecuritiesFvNiRealizedLoss


Equity
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-06-302019-03-31
Value28000.031000.0010000.05000.0235000.0235000.03000.0
Percentage of EquitySecuritiesFvNiRealizedLoss100.0100.00.0100.0100.0100.0100.0100.0

us-gaap:IncomeLossFromEquityMethodInvestments

us-gaap:IncomeLossFromEquityMethodInvestments


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value35333028282939373737364141404339363334323029323337342337343131312727232422272323292826252324
Percentage of IncomeLossFromEquityMethodInvestments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncomeLossFromEquityMethodInvestments us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

seic:LSVAssetManagement


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-31
Value3533302828293937373736414140433936333432302932333834353834323231272725242227
Percentage of IncomeLossFromEquityMethodInvestments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0102.8100.9148.7100.7100.8101.0100.8100.8100.7100.8105.6100.0100.0100.0

us-gaap:IncreaseDecreaseDueFromAffiliates

us-gaap:IncreaseDecreaseDueFromAffiliates


Increase
Period End2021-06-302021-03-312020-06-302020-03-31
Value-0.098-51.2660.549-11.81
Percentage of IncreaseDecreaseDueFromAffiliates100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInAccruedLiabilities

us-gaap:IncreaseDecreaseInAccruedLiabilities


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value15-41.717121827-36.81829130.205-47.836221221-43.522367.4684.43-27.7542520-15.514-12.122215-15.6-11.8121411-0.862-12.199119.616-11.0384.5712019-12.235-6.575172.48-20.93-0.15112-3.05
Percentage of IncreaseDecreaseInAccruedLiabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInContractWithCustomerLiability

us-gaap:IncreaseDecreaseInContractWithCustomerLiability


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value-55000.0250000.0-4730000.0-534000.0371000.0-1207000.01656000.0824000.0-274000.0-175000.0100000.0-533000.0471000.0275000.01589000.0-338000.0
Percentage of IncreaseDecreaseInContractWithCustomerLiability100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInDeferredIncomeTaxes

us-gaap:IncreaseDecreaseInDeferredIncomeTaxes


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-31
Value2.9543.915-6.6952.2723.581.8792.009-0.6451.0660.9842.38-3.485-2.81-2.08322-0.225-0.041-0.877-6.3151.21-0.7181.029-3.5485.424-0.5840.1028.0980.502-0.584-4.6861.38231-2.27-7.730.926-0.826-0.774-0.517
Percentage of IncreaseDecreaseInDeferredIncomeTaxes100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInOtherCurrentAssets

us-gaap:IncreaseDecreaseInOtherCurrentAssets


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-31
Value-4.6514.1130.2213.47-7.0129.728-2.6052.979-3.134-0.574-0.4370.8651.5263.5640.621-1.4162.082.298-2.7040.0661.3842.622-2.9994.268-0.096.835-2.835-0.532.1263.266-3.1791.552-2.812.466-0.5811.01-1.8341.6870.413
Percentage of IncreaseDecreaseInOtherCurrentAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInOtherOperatingAssets

us-gaap:IncreaseDecreaseInOtherOperatingAssets


Increase
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value1483000.0-507000.0-5170000.01477000.04658000.0305000.01085000.0-1334000.0571000.0-499000.05003000.0-290000.01568000.043000.0-971000.0849000.0-546000.03547000.015000.0-1099000.0-1489000.063000.0743000.0-100000.03117000.0205000.0-709000.03273000.0-520000.0-639000.0-2273000.02832000.0444000.0-916000.0-1834000.01687000.0413000.01065000.0-999000.01210000.0-2466000.03875000.0
Percentage of IncreaseDecreaseInOtherOperatingAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInOtherOperatingLiabilities

us-gaap:IncreaseDecreaseInOtherOperatingLiabilities


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-31
Value-56000.01043000.04022000.0-2994000.0-1808000.0360000.0-2240000.0948000.0852000.0277000.0-1785000.0708000.0643000.0579000.0-2371000.0609000.0-1468000.0965000.0542000.01841000.0586000.0279000.0-856000.01012000.0450000.0464000.0-943000.01550000.0408000.0705000.0-96000.0846000.0457000.0368000.0-4047000.0447000.0-200000.02556000.0
Percentage of IncreaseDecreaseInOtherOperatingLiabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInOtherReceivables

us-gaap:IncreaseDecreaseInOtherReceivables


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302010-12-312010-09-30
Value-1.1142.023.6271.771-1.739-2.5532.025-0.267-0.1552.693-4.5341.017-1.523-1.7575.7051.913-2.405-10.308121.717-4.5673.5352.306-1.128-0.086-1.3871.862.4890.7723.908-0.2153.621-0.5995.4732.081-4.678-1.3029.1832.771-6.65-11.1857.893
Percentage of IncreaseDecreaseInOtherReceivables100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInReceivables

us-gaap:IncreaseDecreaseInReceivables


Increase
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
Value4.4212226-6.71817-9.084141.88818-12.226136.178259.0658.9171024-20.235.68126.5855.3881.579156.137-17.0633.7065.792150.2580.8487.289.127-24.14328224.4132.771-6.65113.551
Percentage of IncreaseDecreaseInReceivables100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InformationTechnologyAndDataProcessing

us-gaap:InformationTechnologyAndDataProcessing


Information
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value2725242424222222222021212120181817161616151515151413121313121412121211111111111211111010109.928
Percentage of InformationTechnologyAndDataProcessing100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InvestmentIncomeInterestAndDividend

us-gaap:InvestmentIncomeInterestAndDividend


Investment
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value0.8780.9450.9861.0091.373.2033.8454.1674.3134.2574.2513.4823.1622.5022.1291.8991.6861.3431.1741.0261.0331.0830.7880.8460.7550.9691.1060.750.7210.7770.8280.6790.6881.0531.2791.491.441.4871.4491.41.4361.5441.5031.6211.5021.7
Percentage of InvestmentIncomeInterestAndDividend100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:NonconsolidatedLegalEntityFinancialSupportAmount us-gaap:RelatedPartyTransactionsByRelatedParty

us-gaap:NonconsolidatedLegalEntityFinancialSupportAmount

seic:SeiSponsoredOpenEndedMoneyMarketMutualFunds


Nonconsolidated
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-30
Value11108.4788.5759.7146.6416.4536.396.7967.9056.6786.5256.3726.6546.8146.9426.6067.0729.7149.1459.891
Percentage of NonconsolidatedLegalEntityFinancialSupportAmount100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OccupancyNet

us-gaap:OccupancyNet


Occupancy
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-30
Value18171716131620151718181617171718181718171715182216171616171517131518161515141314
Percentage of OccupancyNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OciBeforeReclassificationsNetOfTaxAttributableToParent

us-gaap:OciBeforeReclassificationsNetOfTaxAttributableToParent


Oci
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-31
Value0.7021.142106.5431.052-11.94412
Percentage of OciBeforeReclassificationsNetOfTaxAttributableToParent100.0100.0100.0100.0100.0100.0100.0

us-gaap:OciBeforeReclassificationsNetOfTaxAttributableToParent us-gaap:StatementEquityComponents

us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss


Oci
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-31
Value-0.292-0.543-0.328-0.5420.1131.131-0.147
Percentage of OciBeforeReclassificationsNetOfTaxAttributableToParent-41.6-47.5-3.2-8.310.7-9.5-1.2

us-gaap:AccumulatedTranslationAdjustment


Oci
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-31
Value0.9941.685107.0850.939-13.07512
Percentage of OciBeforeReclassificationsNetOfTaxAttributableToParent141.6147.5103.2108.389.3109.5101.2

us-gaap:OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent

us-gaap:OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent


Other
Period End2021-03-312020-09-302020-06-302020-03-312019-09-302019-06-30
Value-290000.0-304000.0229000.01231000.0167000.0857000.0
Percentage of OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent

us-gaap:OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value0.9941.685107.0850.94-13.07512-5.207-2.877
Percentage of OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent

us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value0.8811.395106.7811.169-11.84412-5.04-2.024.28-4.137-0.642-10.061.7470.397.7177.4982.442-7.417-3.111-5.0832.946-4.944-6.6544.073-8.87
Percentage of OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent us-gaap:StatementEquityComponents

us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value-0.113-0.29-0.071-0.3040.231.231-0.0290.1670.8570.8830.667-0.2070.143-1.63-0.1790.3990.276-0.046-0.99-0.058-0.0030.517-0.334-0.617-0.457-0.087
Percentage of OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent-12.8-20.8-0.7-4.519.7-10.4-0.2-3.3-42.420.6-16.132.2-1.4-93.3-45.95.23.7-1.913.31.90.117.56.89.3-11.21.0

us-gaap:AccumulatedOtherComprehensiveIncome


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value0.8811.395106.7811.169-11.84412-5.04-2.024.28-4.137-0.642
Percentage of OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AccumulatedTranslationAdjustment


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value0.9941.685107.0850.939-13.07512-5.207-2.8773.397-4.804-0.435-10.2033.3770.5697.3187.2222.488-6.427-3.053-5.082.429-4.61-6.0374.53-8.783
Percentage of OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent112.8120.8100.7104.580.3110.4100.2103.3142.479.4116.167.8101.4193.3145.994.896.3101.986.798.199.982.593.290.7111.299.0

us-gaap:OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax

us-gaap:OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-30
Value-179000.0-253000.0-257000.0-238000.0-116000.0-100000.0-118000.0-96000.0-92000.0-86000.0-93000.0-130000.0-112000.0273000.0-66000.0-105000.0-111000.022000.0-118000.0-102000.023000.0-187000.0-71000.0-117000.0-70000.094000.0641000.0-76000.024000.045000.07000.0-55000.0121000.0221000.059000.0-10000.0
Percentage of OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax

us-gaap:OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-30
Value49000.074000.0-316000.063000.0-35000.0-28000.0-28000.0-23000.0-26000.024000.0-21000.0-29000.0-31000.0-15000.0-15000.0-41000.0-53000.010000.0-58000.0-52000.012000.0-103000.0-27000.0-62000.0-39000.052000.0320000.0-39000.013000.025000.0332000.023000.0-66000.0119000.069000.04000.0
Percentage of OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax

us-gaap:OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-292000.0-543000.0-328000.0-542000.0113000.01131000.0-147000.071000.0765000.0797000.0574000.0-337000.032000.0-1357000.0-245000.0294000.0165000.0-24000.0-1108000.0-160000.020000.0330000.0-405000.0-734000.0-527000.07000.034000.0-584000.0453000.0538000.0-263000.0354000.0-1361000.0121000.0-301000.0586000.025000.031000.0216000.0507000.0816000.0-170000.0-581000.0375000.0690000.00
Percentage of OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0

us-gaap:OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax

us-gaap:OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value85000.0160000.0352000.0154000.033000.0339000.0-36000.027000.0230000.0-240000.0178000.0-91000.052000.0424000.0149000.0-116000.0-51000.019000.0603000.094000.0-49000.0-191000.0321000.0200000.0326000.0-25000.0-166000.0330000.0-461000.0-295000.0-253000.0111000.0-771000.041000.0-221000.0230000.070000.07000.0-1489000.0442000.0348000.0112000.0-1355000.0220000.0304000.0345000.0
Percentage of OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherNoncashIncomeExpense

us-gaap:OtherNoncashIncomeExpense


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value63000.0-992000.0-1965000.0-164000.0-395000.01612000.0-1341000.0843000.0-185000.063000.0195000.0-3107000.02422000.0784000.03258000.0-575000.0-436000.0-56000.0212000.0428000.0-354000.0-676000.076000.01095000.0-359000.01628000.0-2226000.06108000.0-3344000.01901000.0-227000.011450000.0745000.0-7996000.011439000.0-4102000.01999000.0-2656000.0-1651000.08342000.0-822000.0-3036000.0-1033000.0-4933000.0
Percentage of OtherNoncashIncomeExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PaymentForContingentConsiderationLiabilityFinancingActivities

us-gaap:PaymentForContingentConsiderationLiabilityFinancingActivities


Payment
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-06-302019-03-31
Value3263000.0702000.0000633000.000
Percentage of PaymentForContingentConsiderationLiabilityFinancingActivities100.0100.00.00.00.0100.00.00.0

us-gaap:PaymentForContingentConsiderationLiabilityFinancingActivities us-gaap:BusinessAcquisition

seic:HuntingtonSteeleLLC


Payment
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-31
Value3263000.0702000.0000633000.0
Percentage of PaymentForContingentConsiderationLiabilityFinancingActivities100.0100.00.00.00.0100.0

us-gaap:PaymentsForProceedsFromOtherInvestingActivities

us-gaap:PaymentsForProceedsFromOtherInvestingActivities


Payments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value0.011-0.1120.03.0-1.50.0-2.5380.00.0-2.2240.40.3550.01.450.00.0-1.1130.0-0.20.00.00.01.00.00.02.00.00.00.02.624-0.02
Percentage of PaymentsForProceedsFromOtherInvestingActivities0.0100.0100.00.0100.0100.00.0100.00.00.0100.0100.0100.00.0100.00.00.0100.00.0100.00.00.00.0100.00.00.0100.00.00.00.0100.0100.0

us-gaap:PaymentsForSoftware

us-gaap:PaymentsForSoftware


Payments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-30
Value5.9116.365.4796.1076.0756.4587.2537.6339.2519.937108.7581112121516161713109.4776.9086.4398.087.9898.6847.9318.8549.4088.4568.858
Percentage of PaymentsForSoftware100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PaymentsToAcquireMarketableSecurities

us-gaap:PaymentsToAcquireMarketableSecurities


Payments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value305129533129484834438147591519218.258201822238.652187.186224.107147.63286.6458.907333.90611118.6784.1819.64626109.289279.9684.3481013
Percentage of PaymentsToAcquireMarketableSecurities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProceedsFromIssuanceOfCommonStock

us-gaap:ProceedsFromIssuanceOfCommonStock


Proceeds
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value1315195.2065.994181917158.8939.3158.709125711121216138.823196.476139.6882319232915351115152418152.403121.7221.6541010121.977.7496.072
Percentage of ProceedsFromIssuanceOfCommonStock100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities

us-gaap:ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities


Proceeds
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-31
Value2142424034373352394551514618132511151116141211109.3977.37511117.1269.07710117.9729.8351614111022
Percentage of ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProceedsFromSaleAndMaturityOfMarketableSecurities

us-gaap:ProceedsFromSaleAndMaturityOfMarketableSecurities


Proceeds
Period End2020-12-312020-09-302020-06-302020-03-312019-06-302019-03-31
Value0778000.0064000.000
Percentage of ProceedsFromSaleAndMaturityOfMarketableSecurities0.0100.00.0100.00.00.0

us-gaap:ProfessionalFees

us-gaap:ProfessionalFees


Professional
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value55545957575350484550495150484846484345433938373536353334333432333331292726262730292523212220
Percentage of ProfessionalFees100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProvisionForDoubtfulAccounts

us-gaap:ProvisionForDoubtfulAccounts


Provision
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value881000.01207000.0-210000.0231000.0-202000.080000.0-110000.0210000.0468000.0-85000.052000.061000.0-183000.093000.0-4000.019000.0162000.0-5000.0-464000.041000.0246000.051000.061000.0-68000.0-11000.0-117000.0-254000.0160000.0252000.0-25000.026000.0-663000.0267000.0216000.0-7000.0-8000.0-56000.0-48000.0-173000.0229000.0-91000.0-236000.0-358000.0247000.0
Percentage of ProvisionForDoubtfulAccounts100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent

us-gaap:ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent


Reclassification
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-31
Value-179000.0-253000.0-257000.0-238000.0-117000.0-100000.0-118000.0
Percentage of ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent100.0100.0100.0100.0100.0100.0100.0

us-gaap:ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent us-gaap:StatementEquityComponents

us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss


Reclassification
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-31
Value-179000.0-253000.0-257000.0-238000.0-117000.0-100000.0-118000.0
Percentage of ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent100.0100.0100.0100.0100.0100.0100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue


Share
Period End2021-06-302021-03-312020-12-312011-12-312011-09-302010-12-312010-09-30
Value1211200.1540.2834.60.44
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue100.0100.0100.0100.0100.0100.0100.0

us-gaap:StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans us-gaap:StatementEquityComponents

us-gaap:StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans

us-gaap:CommonStock


Stock
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value0.0180.0240.0220.0260.0260.0210.0160.0210.0240.0320.020.0210.020.016
Percentage of StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StockIssuedDuringPeriodSharesStockOptionsExercised us-gaap:StatementEquityComponents

us-gaap:StockIssuedDuringPeriodSharesStockOptionsExercised

us-gaap:CommonStock


Stock
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value394000.0433000.0705000.0130000.0158000.0570000.0782000.0646000.0480000.0335000.0464000.0322000.0419000.02027000.0
Percentage of StockIssuedDuringPeriodSharesStockOptionsExercised100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StockIssuedDuringPeriodValueEmployeeStockPurchasePlan

us-gaap:StockIssuedDuringPeriodValueEmployeeStockPurchasePlan


Stock
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value966000.01139000.01153000.01142000.01106000.0999000.01071000.01322000.01107000.01146000.01005000.0
Percentage of StockIssuedDuringPeriodValueEmployeeStockPurchasePlan100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StockIssuedDuringPeriodValueEmployeeStockPurchasePlan us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital


Stock
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value966000.01139000.0946000.01152000.01142000.01106000.0833000.0998000.01071000.01322000.0913000.01106000.01146000.01005000.0
Percentage of StockIssuedDuringPeriodValueEmployeeStockPurchasePlan100.0100.00.099.9100.0100.00.099.9100.0100.00.099.9100.0100.0

us-gaap:CommonStock


Stock
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-03-31
Value01000.00001000.000-1000.01000.00
Percentage of StockIssuedDuringPeriodValueEmployeeStockPurchasePlan0.00.10.00.00.00.10.00.00.00.10.0

us-gaap:StockIssuedDuringPeriodValueStockOptionsExercised

us-gaap:StockIssuedDuringPeriodValueStockOptionsExercised


Stock
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value12144.0534.8521716147.5717.6021056
Percentage of StockIssuedDuringPeriodValueStockOptionsExercised100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StockIssuedDuringPeriodValueStockOptionsExercised us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital


Stock
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value1214184.0514.851171816147.5678.3987.5991056
Percentage of StockIssuedDuringPeriodValueStockOptionsExercised100.0100.00.0100.0100.0100.00.0100.0100.099.90.0100.0100.0100.0

us-gaap:CommonStock


Stock
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value0.0040.0040.0070.0020.0010.0060.0070.0070.0040.0040.0050.0030.0040.02
Percentage of StockIssuedDuringPeriodValueStockOptionsExercised0.00.00.00.00.00.00.00.00.00.10.00.00.00.0

us-gaap:StockRepurchasedAndRetiredDuringPeriodShares us-gaap:ShareRepurchaseProgram

us-gaap:StockRepurchasedAndRetiredDuringPeriodShares

seic:CommonStockBuyback


Stock
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value2.0861.1521.8232.111.6422.4331.2751.41.8251.725
Percentage of StockRepurchasedAndRetiredDuringPeriodShares100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StockRepurchasedAndRetiredDuringPeriodShares us-gaap:StatementEquityComponents

us-gaap:CommonStock


Stock
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value2.0861.1521.8222.111.6422.4331.2751.41.8251.7252.3251.6681.6291.122
Percentage of StockRepurchasedAndRetiredDuringPeriodShares100.0100.099.9100.0100.0100.0100.0100.0100.0100.00.00.00.00.0

us-gaap:StockRepurchasedAndRetiredDuringPeriodValue

us-gaap:StockRepurchasedAndRetiredDuringPeriodValue


Stock
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value129661088912781978810210482
Percentage of StockRepurchasedAndRetiredDuringPeriodValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StockRepurchasedAndRetiredDuringPeriodValue us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital


Stock
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value126.83910119.293136.8027.4699.7379.202118.1177.9295.461
Percentage of StockRepurchasedAndRetiredDuringPeriodValue9.610.20.011.010.410.80.09.210.010.40.07.97.66.6

us-gaap:CommonStock


Stock
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value0.0210.0110.0180.0220.0160.0240.0120.0150.0180.0170.0230.0170.0160.011
Percentage of StockRepurchasedAndRetiredDuringPeriodValue0.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:RetainedEarnings


Stock
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value1166088968011374738779103949676
Percentage of StockRepurchasedAndRetiredDuringPeriodValue90.489.80.089.089.689.20.090.889.989.60.092.192.493.3

us-gaap:StockRepurchasedDuringPeriodValue us-gaap:ShareRepurchaseProgram

us-gaap:StockRepurchasedDuringPeriodValue

seic:CommonStockBuyback


Stock
Period End2021-06-302021-03-312020-12-31
Value1296699
Percentage of StockRepurchasedDuringPeriodValue100.0100.0100.0

us-gaap:UnrealizedGainLossOnInvestments us-gaap:FinancialInstrument

us-gaap:UnrealizedGainLossOnInvestments

us-gaap:PrivateEquityFundsForeign


Unrealized
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-30
Value309000.0457000.0458000.0996000.0-2235000.099000.095000.0
Percentage of UnrealizedGainLossOnInvestments100.0100.0100.0100.0100.0100.0100.0

us-gaap:WeightedAverageNumberDilutedSharesOutstandingAdjustment

us-gaap:WeightedAverageNumberDilutedSharesOutstandingAdjustment


Weighted
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-30
Value2.1382.1052.0952.122.93.3723.3023.2314.2284.6835.993.2463.3843.6513.0093.2933.1323.6763.8214.0084.983.6984.5224.7353.8351761751750.1776680.182580.187020.1884950.1895210.1915
Percentage of WeightedAverageNumberDilutedSharesOutstandingAdjustment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:WeightedAverageNumberOfSharesIssuedBasic

us-gaap:WeightedAverageNumberOfSharesIssuedBasic


Weighted
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value142143-0.877145147149-0.469150151153-0.507156157157-0.262157158159-0.558160161163-0.417165166166-0.366167168169-0.482171172172-0.5741731740.1763481820.1817180.1845850.1857871880.1879640.189356
Percentage of WeightedAverageNumberOfSharesIssuedBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

seic:AccruedSubAdvisoryDistributionAndOtherAssetManagementFeesCurrent

seic:AccruedSubAdvisoryDistributionAndOtherAssetManagementFeesCurrent


Accrued
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312012-12-31
Value5949495447484645464242494639423836344134333232323229313028252517
Percentage of AccruedSubAdvisoryDistributionAndOtherAssetManagementFeesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

seic:AccumulatedOtherComprehensiveIncomeLossDebtSecuritiesAvailableForSaleSecuritiesAdjustmentTax

seic:AccumulatedOtherComprehensiveIncomeLossDebtSecuritiesAvailableForSaleSecuritiesAdjustmentTax


Accumulated
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value342000.0377000.0464000.0484000.0575000.0507000.0140000.0148000.097000.0-158000.0-422000.0-621000.0-559000.0-233000.0
Percentage of AccumulatedOtherComprehensiveIncomeLossDebtSecuritiesAvailableForSaleSecuritiesAdjustmentTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

seic:BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedContingentLiabilityCurrent us-gaap:BusinessAcquisition

seic:BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedContingentLiabilityCurrent

seic:HuntingtonSteeleLLC


Business
Period End2020-12-31
Value3931000.0
Percentage of BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedContingentLiabilityCurrent100.0

seic:BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedContingentLiabilityNoncurrent us-gaap:BusinessAcquisition

seic:BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedContingentLiabilityNoncurrent

seic:HuntingtonSteeleLLC


Business
Period End2020-12-31
Value8584000.0
Percentage of BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedContingentLiabilityNoncurrent100.0

seic:CapitalizedSoftwareDevelopmentCostsInProgress us-gaap:FiniteLivedIntangibleAssetsByMajorClass

seic:CapitalizedSoftwareDevelopmentCostsInProgress

seic:SeiWealthPlatform


Capitalized
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value20171363605855514942
Percentage of CapitalizedSoftwareDevelopmentCostsInProgress100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

seic:DebtSecuritiesAvailableForSaleAndEquitySecuritiesFVNI

seic:DebtSecuritiesAvailableForSaleAndEquitySecuritiesFVNI


Debt
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value130114105116105110116101106109111
Percentage of DebtSecuritiesAvailableForSaleAndEquitySecuritiesFVNI100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

seic:DebtSecuritiesAvailableForSaleAndEquitySecuritiesFVNIAccumulatedGrossUnrealizedGainBeforeTax

seic:DebtSecuritiesAvailableForSaleAndEquitySecuritiesFVNIAccumulatedGrossUnrealizedGainBeforeTax


Debt
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value2392000.02627000.02870000.03078000.03175000.02259000.01562000.01413000.01166000.0591000.0126000.0
Percentage of DebtSecuritiesAvailableForSaleAndEquitySecuritiesFVNIAccumulatedGrossUnrealizedGainBeforeTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

seic:DebtSecuritiesAvailableForSaleAndEquitySecuritiesFVNIAccumulatedGrossUnrealizedLossBeforeTax

seic:DebtSecuritiesAvailableForSaleAndEquitySecuritiesFVNIAccumulatedGrossUnrealizedLossBeforeTax


Debt
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value277000.0594000.01126000.039000.0411000.0341000.01072000.02623000.0
Percentage of DebtSecuritiesAvailableForSaleAndEquitySecuritiesFVNIAccumulatedGrossUnrealizedLossBeforeTax100.0100.0100.0100.0100.0100.0100.0100.0

seic:DebtSecuritiesAvailableForSaleAndEquitySecuritiesFVNICost

seic:DebtSecuritiesAvailableForSaleAndEquitySecuritiesFVNICost


Debt
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value127112102113102109115100105110114
Percentage of DebtSecuritiesAvailableForSaleAndEquitySecuritiesFVNICost100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

seic:DeferredTaxLiabilitiesDeferredExpenseCapitalizedContractCost

seic:DeferredTaxLiabilitiesDeferredExpenseCapitalizedContractCost


Deferred
Period End2020-12-312019-12-312018-12-312017-12-31
Value7762000.07072000.05490000.00
Percentage of DeferredTaxLiabilitiesDeferredExpenseCapitalizedContractCost100.0100.0100.00.0

seic:EquitySecuritiesFVNIAccumulatedGrossUnrealizedGainBeforeTax us-gaap:FinancialInstrument

seic:EquitySecuritiesFVNIAccumulatedGrossUnrealizedGainBeforeTax

seic:EquitiesAndOtherMutualFunds


Equity
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value236000.0543000.0473000.0909000.0602000.056000.0832000.0666000.0634000.0514000.0126000.0
Percentage of EquitySecuritiesFVNIAccumulatedGrossUnrealizedGainBeforeTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

seic:SEISponsoredMutualFunds


Equity
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value666000.0446000.0382000.063000.072000.00125000.0105000.0108000.077000.00
Percentage of EquitySecuritiesFVNIAccumulatedGrossUnrealizedGainBeforeTax282.282.180.86.912.00.015.015.817.015.00.0

seic:EquitySecuritiesFVNIAccumulatedGrossUnrealizedLossBeforeTax us-gaap:FinancialInstrument

seic:EquitySecuritiesFVNIAccumulatedGrossUnrealizedLossBeforeTax

seic:SEISponsoredMutualFunds


Equity
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value277000.0594000.01126000.039000.0411000.0341000.0384000.0788000.0
Percentage of EquitySecuritiesFVNIAccumulatedGrossUnrealizedLossBeforeTax100.0100.0100.0100.0100.0100.0100.0100.0

seic:GrossLiabilityForUnrecognizedTaxBenefitsExclusiveOfInterestAndPenalties

seic:GrossLiabilityForUnrecognizedTaxBenefitsExclusiveOfInterestAndPenalties


Gross
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value16161516171615141514141415141416181817161514141414141413131212121011111111119.41117.4015.723
Percentage of GrossLiabilityForUnrecognizedTaxBenefitsExclusiveOfInterestAndPenalties100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

seic:LesseeOperatingLeaseLiabilityToBePaidDueYearFiveAndThereafter

seic:LesseeOperatingLeaseLiabilityToBePaidDueYearFiveAndThereafter


Lessee
Period End2020-12-31
Value11
Percentage of LesseeOperatingLeaseLiabilityToBePaidDueYearFiveAndThereafter100.0

seic:ReceivablesGrossCurrent

seic:ReceivablesGrossCurrent


Receivables
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312012-12-31
Value412408386379352359341350336334316328315309283274263252228248243230223218218201195212208208187172
Percentage of ReceivablesGrossCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

seic:UnrecognizedTaxBenefitIncludingInterestAndPenalties

seic:UnrecognizedTaxBenefitIncludingInterestAndPenalties


Unrecognized
Period End2020-12-31
Value18
Percentage of UnrecognizedTaxBenefitIncludingInterestAndPenalties100.0

us-gaap:AccruedEmployeeBenefitsCurrent

us-gaap:AccruedEmployeeBenefitsCurrent


Accrued
Period End2021-06-302021-03-312020-12-312020-09-302019-12-31
Value151318139.222
Percentage of AccruedEmployeeBenefitsCurrent100.0100.0100.0100.0100.0

us-gaap:AccruedIncomeTaxesNoncurrent

us-gaap:AccruedIncomeTaxesNoncurrent


Accrued
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value0.8030.8030.8030.8030.8030.8030.8030.8030.8030.8030.8030.779.6291010
Percentage of AccruedIncomeTaxesNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AccruedProfessionalFeesCurrent

us-gaap:AccruedProfessionalFeesCurrent


Accrued
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value363231313532282730333128293529293429242423252118232318232323192119221614161917162016
Percentage of AccruedProfessionalFeesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AccruedSalariesCurrent

us-gaap:AccruedSalariesCurrent


Accrued
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value653695755033967355319768572888634825795643247456422873604029695537256350312148372643
Percentage of AccruedSalariesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax

us-gaap:AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax


Accumulated
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-312009-12-312008-12-31
Value1148000.01261000.01551000.01622000.01926000.01696000.0465000.0494000.0327000.0-530000.0-1413000.0-2080000.0-1873000.0-2016000.0-386000.0-207000.0-606000.0-882000.0-836000.0154000.0212000.0215000.0-302000.032000.0649000.01106000.01193000.01800000.02308000.01879000.01386000.01656000.01247000.02729000.02829000.03189000.02593000.02545000.02574000.02354000.01854000.01339000.0960000.0-1524000.0
Percentage of AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AllowanceForDoubtfulAccountsReceivableCurrent

us-gaap:AllowanceForDoubtfulAccountsReceivableCurrent


Allowance
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value3188000.02307000.01100000.01310000.01079000.01281000.01201000.01311000.01101000.0633000.0718000.0666000.0605000.0788000.0695000.0699000.0680000.0518000.0523000.0987000.0946000.0700000.0649000.0588000.0656000.0667000.0784000.01038000.0878000.0626000.0651000.0625000.01288000.01021000.0805000.0812000.0820000.0876000.0924000.01097000.0868000.0959000.01195000.03348000.0
Percentage of AllowanceForDoubtfulAccountsReceivableCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AlternativeInvestment us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:AlternativeInvestment

us-gaap:FairValueMeasuredAtNetAssetValuePerShare


Alternative
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value6932000.06623000.06166000.05207000.04749000.05988000.0
Percentage of AlternativeInvestment100.0100.0100.0100.0100.0100.0

us-gaap:AssetsFairValueDisclosure

us-gaap:AssetsFairValueDisclosure


Assets
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value163154145157145145156139144148147118123110115109112115110119114103106100105991031091119099101153155161160157159179
Percentage of AssetsFairValueDisclosure100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AssetsFairValueDisclosure us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:FairValueInputsLevel1


Assets
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value12121211111012111111101111111110109.99.581232410101111111116171616151417201716171111139.802
Percentage of AssetsFairValueDisclosure7.88.08.37.07.76.97.78.17.97.56.99.58.910.39.79.99.08.58.719.821.410.210.010.911.311.611.20.00.00.015.113.916.417.420.311.210.510.67.37.68.65.5

us-gaap:FairValueInputsLevel2


Assets
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value14313512714112913113812312713213210110693989297100959085899589938891909491929674808086899295898568
Percentage of AssetsFairValueDisclosure87.987.787.489.789.090.588.488.088.488.989.885.786.484.785.084.886.287.086.976.274.785.890.089.188.788.488.80.00.00.084.986.182.381.578.656.257.857.159.957.053.838.4

us-gaap:AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax us-gaap:FinancialInstrument

us-gaap:AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax

us-gaap:FixedIncomeSecurities


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value1490000.01638000.02015000.02106000.02501000.02203000.0605000.0642000.0424000.000000
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.00.00.00.0

us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis us-gaap:FinancialInstrument

us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis

us-gaap:FixedIncomeSecurities


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value115100911039198104899499103758077
Percentage of AvailableForSaleDebtSecuritiesAmortizedCostBasis100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AvailableForSaleSecuritiesDebtSecurities us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FinancialInstrument

us-gaap:AvailableForSaleSecuritiesDebtSecurities

us-gaap:FairValueInputsLevel1, us-gaap:EquitySecurities


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312018-12-31
Value1212121111101210
Percentage of AvailableForSaleSecuritiesDebtSecurities100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueInputsLevel2, us-gaap:FixedIncomeSecurities


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value1171029310594100104909598101
Percentage of AvailableForSaleSecuritiesDebtSecurities921.4830.6768.2950.8841.21001.9864.70.00.00.0995.1

us-gaap:AvailableForSaleSecuritiesDebtSecurities us-gaap:FinancialInstrument

us-gaap:EquitySecurities


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312018-12-31
Value1212121111101210
Percentage of AvailableForSaleSecuritiesDebtSecurities100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FixedIncomeSecurities


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value1171029310594100104909598101727776
Percentage of AvailableForSaleSecuritiesDebtSecurities921.4830.6768.2950.8841.21001.9864.70.00.00.0995.10.00.00.0

us-gaap:AvailableForSaleSecuritiesDebtSecuritiesNoncurrent

us-gaap:AvailableForSaleSecuritiesDebtSecuritiesNoncurrent


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312018-12-31
Value130114105116105110116111
Percentage of AvailableForSaleSecuritiesDebtSecuritiesNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:BilledContractReceivables

us-gaap:BilledContractReceivables


Billed
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312011-12-31
Value99115991068987869177837677857276685654485458584753554348675856444652484637
Percentage of BilledContractReceivables100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:BusinessCombinationContingentConsiderationLiabilityCurrent us-gaap:BusinessAcquisition

us-gaap:BusinessCombinationContingentConsiderationLiabilityCurrent

seic:HuntingtonSteeleLLC


Business
Period End2021-06-302021-03-312020-09-30
Value765000.03229000.03577000.0
Percentage of BusinessCombinationContingentConsiderationLiabilityCurrent100.0100.0100.0

us-gaap:BusinessCombinationContingentConsiderationLiabilityNoncurrent us-gaap:BusinessAcquisition

us-gaap:BusinessCombinationContingentConsiderationLiabilityNoncurrent

seic:HuntingtonSteeleLLC


Business
Period End2021-06-302021-03-312020-09-30
Value7994000.08689000.08045000.0
Percentage of BusinessCombinationContingentConsiderationLiabilityNoncurrent100.0100.0100.0

us-gaap:CapitalizedComputerSoftwareAccumulatedAmortization

us-gaap:CapitalizedComputerSoftwareAccumulatedAmortization


Capitalized
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value518505491479466454442430418406395383372361350340328315303292281270259248239228218208198189180171166157149141131124117110103969067
Percentage of CapitalizedComputerSoftwareAccumulatedAmortization100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:CapitalizedComputerSoftwareNet

us-gaap:CapitalizedComputerSoftwareNet


Capitalized
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value256263270278284290296300305307309310312312310307304300295290288289290294304306309310312312312313313305307310312311309305302299294278
Percentage of CapitalizedComputerSoftwareNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:CapitalizedComputerSoftwareNet us-gaap:FiniteLivedIntangibleAssetsByMajorClass

seic:PlatformfortheInvestmentManagerssegment


Capitalized
Period End2020-12-312019-12-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value10152022232425
Percentage of CapitalizedComputerSoftwareNet3.85.36.77.17.57.98.1

seic:SeiWealthPlatform


Capitalized
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-31
Value246252257264269274279283286288288288289287285283283283280279279282285291301298309310312312309
Percentage of CapitalizedComputerSoftwareNet95.995.595.194.994.894.694.494.193.993.693.392.992.592.191.992.493.294.394.896.397.197.798.398.999.297.4100.0100.0100.0100.099.1

us-gaap:CapitalizedContractCostNet

us-gaap:CapitalizedContractCostNet


Capitalized
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value33333333333230282524242221190.0
Percentage of CapitalizedContractCostNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0

us-gaap:CashAndCashEquivalentsFairValueDisclosure

us-gaap:CashAndCashEquivalentsFairValueDisclosure


Cash
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312018-12-31
Value462412445425543419
Percentage of CashAndCashEquivalentsFairValueDisclosure100.0100.0100.0100.0100.0100.0

us-gaap:CashAndCashEquivalentsFairValueDisclosure us-gaap:CashAndCashEquivalents

us-gaap:CashEquivalents


Cash
Period End2021-06-302021-03-312020-12-31
Value452435462
Percentage of CashAndCashEquivalentsFairValueDisclosure0.00.0100.0

us-gaap:DeferredIncomeTaxAssetsNet

us-gaap:DeferredIncomeTaxAssetsNet


Deferred
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value2447000.02706000.02972000.02065000.02343000.02603000.02822000.01421000.01571000.01877000.02042000.02224000.02360000.02767000.0
Percentage of DeferredIncomeTaxAssetsNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredIncomeTaxLiabilities

us-gaap:DeferredIncomeTaxLiabilities


Deferred
Period End2020-12-312019-12-312018-12-312017-12-31
Value92909082
Percentage of DeferredIncomeTaxLiabilities100.0100.0100.0100.0

us-gaap:DeferredTaxAssetsEquityMethodInvestments

us-gaap:DeferredTaxAssetsEquityMethodInvestments


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value3965000.04436000.04118000.04191000.06165000.05534000.06212000.03856000.04397000.03149000.0
Percentage of DeferredTaxAssetsEquityMethodInvestments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredTaxAssetsGross

us-gaap:DeferredTaxAssetsGross


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312012-12-312011-12-312010-12-31
Value1091081071042.0121.1511.388
Percentage of DeferredTaxAssetsGross100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredTaxAssetsOperatingLossCarryforwardsForeign

us-gaap:DeferredTaxAssetsOperatingLossCarryforwardsForeign


Deferred
Period End2020-12-312019-12-312018-12-31
Value6634000.06081000.06533000.0
Percentage of DeferredTaxAssetsOperatingLossCarryforwardsForeign100.0100.0100.0

us-gaap:DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal

us-gaap:DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value65677471201924211314
Percentage of DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredTaxAssetsOther

us-gaap:DeferredTaxAssetsOther


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-31
Value1584000.01271000.01049000.0273000.0813000.002327000.00
Percentage of DeferredTaxAssetsOther100.0100.0100.0100.0100.00.0100.00.0

us-gaap:DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation

us-gaap:DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-31
Value3025000.01960000.01657000.02631000.05022000.04675000.0
Percentage of DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation100.0100.0100.0100.0100.0100.0

us-gaap:DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost

us-gaap:DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value262424243334384542142141
Percentage of DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsContingencies

us-gaap:DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsContingencies


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value2255000.02124000.01882000.01918000.03647000.03014000.02913000.02643000.02359000.01725000.0
Percentage of DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsContingencies100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredTaxLiabilitiesDeferredExpenseCapitalizedSoftware

us-gaap:DeferredTaxLiabilitiesDeferredExpenseCapitalizedSoftware


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value63687170107111118119137139132
Percentage of DeferredTaxLiabilitiesDeferredExpenseCapitalizedSoftware100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsGoodwill

us-gaap:DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsGoodwill


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value2462000.02170000.01823000.01001000.00
Percentage of DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsGoodwill100.0100.0100.0100.00.0

us-gaap:DeferredTaxLiabilitiesOther

us-gaap:DeferredTaxLiabilitiesOther


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value1900000.01755000.0960000.0704000.01115000.00420000.0039000.0363000.0230000.0
Percentage of DeferredTaxLiabilitiesOther100.0100.0100.0100.0100.00.0100.00.0100.0100.0100.0

us-gaap:DeferredTaxLiabilitiesPrepaidExpenses

us-gaap:DeferredTaxLiabilitiesPrepaidExpenses


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-31
Value5747000.04593000.04429000.03549000.04597000.04294000.0
Percentage of DeferredTaxLiabilitiesPrepaidExpenses100.0100.0100.0100.0100.0100.0

us-gaap:DeferredTaxLiabilitiesPropertyPlantAndEquipment

us-gaap:DeferredTaxLiabilitiesPropertyPlantAndEquipment


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value116.0326.5453.1825.192.6953.6377.0431013
Percentage of DeferredTaxLiabilitiesPropertyPlantAndEquipment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DividendsPayableCurrentAndNoncurrent

us-gaap:DividendsPayableCurrentAndNoncurrent


Dividends
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value53525047444240370.0260.0
Percentage of DividendsPayableCurrentAndNoncurrent100.0100.0100.0100.0100.0100.0100.0100.00.0100.00.0

us-gaap:DueFromOtherRelatedPartiesCurrent

us-gaap:DueFromOtherRelatedPartiesCurrent


Due
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value5657555149515452525249545354565049516148475148454647484644433939353631293334252731282928
Percentage of DueFromOtherRelatedPartiesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized

us-gaap:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized


Employee
Period End2021-06-302021-03-312020-12-312020-09-302012-12-312012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value861011125950414548414427
Percentage of EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:EquityMethodInvestmentOwnershipPercentage us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

us-gaap:EquityMethodInvestmentOwnershipPercentage

seic:LSVAssetManagement


Equity
Period End2021-04-012021-03-312020-12-312020-06-302020-03-312018-12-312017-12-312016-12-312016-04-302016-03-312015-12-312014-12-312014-09-302013-09-302013-06-302013-04-302013-04-242013-03-312012-12-312012-03-312011-12-31
Value38.738.838.80.3880.3890.3890.3890.3890.3890.3920.3920.3930.3930.3930.3930.3930.3930.3980.3980.3980.412
Percentage of EquityMethodInvestmentOwnershipPercentage100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:EquityMethodInvestmentOwnershipPercentage us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, us-gaap:SubsequentEventType

seic:LSVAssetManagement, us-gaap:SubsequentEvent


Equity
Period End2021-04-012020-04-012016-04-19
Value38.70.3880.389
Percentage of EquityMethodInvestmentOwnershipPercentage100.00.00.0

us-gaap:EquityMethodInvestments us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

us-gaap:EquityMethodInvestments

seic:LSVAssetManagement


Equity
Period End2021-06-302021-03-312020-12-312020-09-302014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-31
Value475198335147515046706868
Percentage of EquityMethodInvestments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:EquitySecuritiesFvNiCost us-gaap:FinancialInstrument

us-gaap:EquitySecuritiesFvNiCost

seic:EquitiesAndOtherMutualFunds


Equity
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value4933000.04494000.04421000.03605000.03600000.03595000.03637000.03476000.03477000.03475000.03434000.0
Percentage of EquitySecuritiesFvNiCost100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

seic:SEISponsoredMutualFunds


Equity
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value6896000.06872000.06866000.06793000.07514000.07508000.07564000.07477000.07464000.07429000.07446000.0
Percentage of EquitySecuritiesFvNiCost139.8152.9155.3188.4208.7208.8208.0215.1214.7213.8216.8

us-gaap:FinancialInstrumentsOwnedUSGovernmentAndAgencyObligationsAtFairValue

us-gaap:FinancialInstrumentsOwnedUSGovernmentAndAgencyObligationsAtFairValue


Financial
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-31
Value2633343535313332323330282821212121212121212121212121212121212120212120212121202021200.0
Percentage of FinancialInstrumentsOwnedUSGovernmentAndAgencyObligationsAtFairValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0

us-gaap:FinancialInstrumentsOwnedUSGovernmentAndAgencyObligationsAtFairValue us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:FairValueInputsLevel2


Financial
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-30
Value2633343535313332323330282821212121212121212121212121212121212120212120212121202021
Percentage of FinancialInstrumentsOwnedUSGovernmentAndAgencyObligationsAtFairValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FiniteLivedIntangibleAssetsAccumulatedAmortization

us-gaap:FiniteLivedIntangibleAssetsAccumulatedAmortization


Finite
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-31
Value14131211109.6948.7737.8536.9326.0115.094.1693.2482.3281.5520.0
Percentage of FiniteLivedIntangibleAssetsAccumulatedAmortization100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths


Finite
Period End2020-12-312019-12-312018-12-312017-12-31
Value3.6833.6833.68343
Percentage of FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths100.0100.0100.0100.0

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths us-gaap:FiniteLivedIntangibleAssetsByMajorClass

us-gaap:SoftwareDevelopment


Finite
Period End2020-12-312019-12-312018-12-31
Value524846
Percentage of FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths1424.51314.01265.5

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearFive

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearFive


Finite
Period End2020-12-312019-12-312018-12-312017-12-31
Value2.5992.8182.98929
Percentage of FiniteLivedIntangibleAssetsAmortizationExpenseYearFive100.0100.0100.0100.0

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearFive us-gaap:FiniteLivedIntangibleAssetsByMajorClass

us-gaap:SoftwareDevelopment


Finite
Period End2020-12-312019-12-312018-12-31
Value181413
Percentage of FiniteLivedIntangibleAssetsAmortizationExpenseYearFive724.8514.2439.8

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearFour

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearFour


Finite
Period End2020-12-312019-12-312018-12-312017-12-31
Value2.8182.9893.33643
Percentage of FiniteLivedIntangibleAssetsAmortizationExpenseYearFour100.0100.0100.0100.0

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearFour us-gaap:FiniteLivedIntangibleAssetsByMajorClass

us-gaap:SoftwareDevelopment


Finite
Period End2020-12-312019-12-312018-12-31
Value181431
Percentage of FiniteLivedIntangibleAssetsAmortizationExpenseYearFour668.5484.7953.7

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearThree

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearThree


Finite
Period End2020-12-312019-12-312018-12-312017-12-31
Value2.9893.3363.68343
Percentage of FiniteLivedIntangibleAssetsAmortizationExpenseYearThree100.0100.0100.0100.0

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearThree us-gaap:FiniteLivedIntangibleAssetsByMajorClass

us-gaap:SoftwareDevelopment


Finite
Period End2020-12-312019-12-312018-12-31
Value183346
Percentage of FiniteLivedIntangibleAssetsAmortizationExpenseYearThree630.2997.41257.9

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo


Finite
Period End2020-12-312019-12-312018-12-312017-12-31
Value3.3363.6833.68343
Percentage of FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo100.0100.0100.0100.0

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo us-gaap:FiniteLivedIntangibleAssetsByMajorClass

us-gaap:SoftwareDevelopment


Finite
Period End2020-12-312019-12-312018-12-31
Value374846
Percentage of FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo1127.71306.51265.5

us-gaap:FiniteLivedIntangibleAssetsGross

us-gaap:FiniteLivedIntangibleAssetsGross


Finite
Period End2020-12-312019-12-312018-12-312018-09-302018-03-312017-12-31
Value363636363030
Percentage of FiniteLivedIntangibleAssetsGross100.0100.0100.0100.0100.0100.0

us-gaap:FiniteLivedIntangibleAssetsGross us-gaap:FiniteLivedIntangibleAssetsByMajorClass

us-gaap:CustomerRelationships


Finite
Period End2020-12-312019-12-312018-12-312018-09-302018-03-312017-12-31
Value161616161010
Percentage of FiniteLivedIntangibleAssetsGross46.146.146.146.135.735.7

us-gaap:TradeNames


Finite
Period End2020-12-312019-12-312018-12-312018-09-302018-03-312017-12-31
Value2.842.842.842.842.392.39
Percentage of FiniteLivedIntangibleAssetsGross7.77.77.77.77.97.9

us-gaap:InvestmentsFairValueDisclosure us-gaap:FinancialInstrument

us-gaap:InvestmentsFairValueDisclosure

seic:InvestmentFundsSponsoredbyLSV


Investments
Period End2020-12-312020-03-312019-12-312018-12-31
Value6166000.03753000.05988000.04887000.0
Percentage of InvestmentsFairValueDisclosure100.0100.0100.0100.0

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths


Lessee
Period End2020-12-31
Value9183000.0
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths100.0

us-gaap:LettersOfCreditOutstandingAmount

us-gaap:LettersOfCreditOutstandingAmount


Letters
Period End2020-12-312020-09-30
Value4.6311
Percentage of LettersOfCreditOutstandingAmount100.0100.0

us-gaap:LettersOfCreditOutstandingAmount us-gaap:DebtInstrument

seic:A2021CreditFacility


Letters
Period End2021-06-30
Value5.808
Percentage of LettersOfCreditOutstandingAmount0.0

us-gaap:LettersOfCreditOutstandingAmount us-gaap:DebtInstrument, us-gaap:SubsequentEventType

seic:A2021CreditFacility, us-gaap:SubsequentEvent


Letters
Period End2021-04-23
Value4.63
Percentage of LettersOfCreditOutstandingAmount0.0

us-gaap:LiabilityForUncertainTaxPositionsCurrent

us-gaap:LiabilityForUncertainTaxPositionsCurrent


Liability
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value6053000.06553000.06546000.03986000.04950000.04950000.04896000.01008000.02964000.02964000.03131000.01398000.02944000.02944000.03275000.02648000.06293000.03849000.03866000.03336000.04503000.04811000.04511000.04097000.04809000.04771000.04757000.03254000.04218000.04196000.04175000.04985000.03794000.05309000.05291000.0957000.01768000.01768000.01768000.0554000.0554000.0767000.0
Percentage of LiabilityForUncertainTaxPositionsCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:LiabilityForUncertainTaxPositionsNoncurrent

us-gaap:LiabilityForUncertainTaxPositionsNoncurrent


Liability
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value131211141413121514131214131212141415141412111112111010119.729.3128.6078.7037.8577.47.0321110108.276117.5495.9395.6455.726
Percentage of LiabilityForUncertainTaxPositionsNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:LineOfCreditFacilityMaximumBorrowingCapacity us-gaap:CreditFacility, us-gaap:DebtInstrument

us-gaap:LineOfCreditFacilityMaximumBorrowingCapacity

us-gaap:LetterOfCredit, seic:A2021CreditFacility


Line
Period End2021-04-23
Value15
Percentage of LineOfCreditFacilityMaximumBorrowingCapacity100.0

us-gaap:LineOfCreditFacilityMaximumBorrowingCapacity us-gaap:CreditFacility, us-gaap:DebtInstrument, us-gaap:SubsequentEventType

us-gaap:LetterOfCredit, seic:A2021CreditFacility, us-gaap:SubsequentEvent


Line
Period End2021-04-23
Value15
Percentage of LineOfCreditFacilityMaximumBorrowingCapacity100.0

us-gaap:LineOfCredit, seic:A2021CreditFacility, us-gaap:SubsequentEvent


Line
Period End2021-04-23
Value325
Percentage of LineOfCreditFacilityMaximumBorrowingCapacity2166.7

us-gaap:LineOfCreditFacilityRemainingBorrowingCapacity us-gaap:CreditFacility

us-gaap:LineOfCreditFacilityRemainingBorrowingCapacity

us-gaap:RevolvingCreditFacility


Line
Period End2020-12-312020-09-30
Value295288
Percentage of LineOfCreditFacilityRemainingBorrowingCapacity100.0100.0

us-gaap:LineOfCreditFacilityRemainingBorrowingCapacity us-gaap:CreditFacility, us-gaap:DebtInstrument

us-gaap:LineOfCredit, seic:A2021CreditFacility


Line
Period End2021-06-30
Value319
Percentage of LineOfCreditFacilityRemainingBorrowingCapacity0.0

us-gaap:LineOfCreditFacilityRemainingBorrowingCapacity us-gaap:CreditFacility, us-gaap:DebtInstrument, us-gaap:SubsequentEventType

us-gaap:LineOfCredit, seic:A2021CreditFacility, us-gaap:SubsequentEvent


Line
Period End2021-04-23
Value320
Percentage of LineOfCreditFacilityRemainingBorrowingCapacity0.0

us-gaap:OperatingLeaseWeightedAverageDiscountRatePercent

us-gaap:OperatingLeaseWeightedAverageDiscountRatePercent


Operating
Period End2020-12-312019-12-31
Value2.432.61
Percentage of OperatingLeaseWeightedAverageDiscountRatePercent100.0100.0

us-gaap:OtherLongTermInvestments

us-gaap:OtherLongTermInvestments


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312018-12-31
Value4751983341456752
Percentage of OtherLongTermInvestments100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherLongTermInvestments us-gaap:FinancialInstrument

us-gaap:PrivateEquityFundsForeign


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312018-12-31
Value6.9326.6236.1665.2074.7493.7535.9884.887
Percentage of OtherLongTermInvestments14.612.86.315.711.68.38.99.3

us-gaap:OtherReceivablesGrossCurrent

us-gaap:OtherReceivablesGrossCurrent


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312012-12-31
Value1213251310161517161313101115121313101014188.948214.2459.8634.4447.7715.0576.73314149.87
Percentage of OtherReceivablesGrossCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PartnersCapital us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, us-gaap:EquityMethodInvestmentNonconsolidatedInvestee

us-gaap:PartnersCapital

seic:LSVAssetManagement, us-gaap:EquityMethodInvestmentNonconsolidatedInvesteeOrGroupOfInvestees


Partners
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value738574405897
Percentage of PartnersCapital100.0100.0100.0100.0100.0100.0

us-gaap:RestrictedCashAndCashEquivalentsAtCarryingValue

us-gaap:RestrictedCashAndCashEquivalentsAtCarryingValue


Restricted
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value0.3513.1013.1013.1013.1013.1013.1013.13.523.5173.5143.5113.5093.5073.5053.5033.5023.53.55.55.55.55.56.3196.6355.8055.8015.55.55.55.55.55.55.56.06.06.06.06.04.04.04.04.020
Percentage of RestrictedCashAndCashEquivalentsAtCarryingValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RestrictedCashAndCashEquivalentsAtCarryingValue us-gaap:RestrictedCashAndCashEquivalentsCashAndCashEquivalents

seic:SeiInvestmentsDistributionCoSidco


Restricted
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302013-12-31
Value0.1010.1010.1010.1010.1010.1010.1010.10.520.5170.5140.5110.5090.5070.5050.5030.5020.50.50.50.50.50.50.50.50.50.50.50.50.5
Percentage of RestrictedCashAndCashEquivalentsAtCarryingValue28.83.33.33.33.33.33.33.214.814.714.614.614.514.514.414.414.314.314.39.19.19.19.17.97.58.68.69.19.19.1

seic:SeiInvestmentsEuropeLimited


Restricted
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302013-12-31
Value0.253.03.03.03.03.03.03.03.03.03.03.03.03.03.03.03.03.03.05.05.05.05.05.05.05.05.05.05.05.0
Percentage of RestrictedCashAndCashEquivalentsAtCarryingValue71.296.796.796.796.796.796.796.885.285.385.485.485.585.585.685.685.785.785.790.990.990.990.979.175.486.186.290.990.990.9

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant


Share
Period End2020-12-312013-12-312012-12-31
Value150.7442.569
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant100.0100.0100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber


Share
Period End2021-06-302021-03-312020-12-312020-09-302019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-31
Value5.8146.2076.6417.3528.2149.359106.6928.50810149.76111411
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber us-gaap:ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRange

seic:FifthRangeOfExercisePrices


Share
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value0.0051.5751.6862.0950.00.00.00.0350.0150.015
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber0.119.218.019.70.00.00.00.20.20.1

seic:FirstRangeOfExercisePrices


Share
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value0.6650.8431.9962.1781.982.3962.9154.3043.1533.296
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber10.010.321.320.529.628.228.329.532.328.2

seic:FourthRangeOfExercisePrices


Share
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value3.171.8550.9080.7471.3532.3491.9012.4920.02.562
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber47.722.69.77.020.227.618.517.10.021.9

seic:SecondRangeOfExercisePrices


Share
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value0.9441.8692.3791.1741.8462.0853.5194.9121.6472.642
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber14.222.825.411.127.624.534.233.616.922.6

seic:ThirdRangeOfExercisePrices


Share
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value1.8572.0722.393.4221.5131.6781.962.8584.9453.165
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber28.025.225.532.222.619.719.019.650.727.1

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice


Share
Period End2021-06-302021-03-312020-12-312020-09-302019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-31
Value40.3539.7839.3538.1137.3432.8928.9921.2822.0420.5819.4518.11
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice us-gaap:ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRange

seic:FifthRangeOfExercisePrices


Share
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value63.553.453.3645.490031.1731.1727.0327.03
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice161.4143.0162.2156.90.00.0151.5160.3149.30.0

seic:FirstRangeOfExercisePrices


Share
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value15.7915.7916.6315.4515.0114.9714.9514.9514.7314.66
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice40.142.350.653.370.567.972.676.981.30.0

seic:FourthRangeOfExercisePrices


Share
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value51.3449.6249.6133.5833.2632.3226.5726.57021.55
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice130.5132.9150.8115.8156.3146.6129.1136.60.00.0

seic:SecondRangeOfExercisePrices


Share
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value22.4523.0423.1317.6717.6517.6518.2718.2717.6314.84
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice57.161.770.361.082.980.188.893.997.30.0

seic:ThirdRangeOfExercisePrices


Share
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value35.8535.8135.723.1923.223.221.9221.9220.3918.32
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice91.195.9108.580.0109.0105.3106.5112.7112.60.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue


Share
Period End2020-12-31
Value158
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue100.0

us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1

us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1


Sharebased
Period End2021-06-302021-03-312020-12-312020-09-30
Value12513112096
Percentage of SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1100.0100.0100.0100.0

us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfShares

us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfShares


Sharebased
Period End2020-12-31
Value11
Percentage of SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfShares100.0

us-gaap:SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleAmountOfUnrecordedBenefit us-gaap:ReasonablyPossibleSignificantChangeInUnrecognizedTaxBenefitsByItem

us-gaap:SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleAmountOfUnrecordedBenefit

seic:SettlementandLapseofStatute


Significant
Period End2021-06-302021-03-312020-12-312020-09-30
Value6053000.06553000.06546000.03986000.0
Percentage of SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleAmountOfUnrecordedBenefit100.0100.0100.0100.0

us-gaap:StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1 us-gaap:ShareRepurchaseProgram

us-gaap:StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1

seic:CommonStockBuyback


Stock
Period End2021-06-302021-03-312020-12-312020-09-302019-06-302017-09-302016-03-31
Value24612519241303032
Percentage of StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1100.0100.0100.0100.0100.0100.0100.0

us-gaap:StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1 us-gaap:ShareRepurchaseProgram, us-gaap:SubsequentEventType

seic:CommonStockBuyback, us-gaap:SubsequentEvent


Stock
Period End2020-10-202019-07-232017-10-242016-04-19
Value291280230232
Percentage of StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount10.00.00.00.0

us-gaap:UnbilledContractsReceivable

us-gaap:UnbilledContractsReceivable


Unbilled
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312011-12-31
Value30027926225925225624024124223722624021822019419219318616817916616215416015315313914014213612812612211911692
Percentage of UnbilledContractsReceivable100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued

us-gaap:UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued


Unrecognized
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value2250000.02248000.02105000.02212000.02387000.02200000.01962000.01520000.01677000.01453000.01289000.01366000.01379000.01218000.01175000.01361000.01579000.01382000.01224000.01411000.01437000.01497000.01391000.01414000.01322000.01189000.01066000.0967000.0919000.0825000.0754000.0957000.0933000.0822000.0770000.0850000.0853000.0843000.0634000.0701000.0702000.0689000.0
Percentage of UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate

us-gaap:UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate


Unrecognized
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value16161516171615141514131314131313161514141313121212121211111010109.251109.9659.5259.974108.329.8266.354.87
Percentage of UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ValuationAllowancesAndReservesBalance us-gaap:ValuationAllowancesAndReservesType

us-gaap:ValuationAllowancesAndReservesBalance

us-gaap:AllowanceForCreditLoss


Valuation
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-31
Value1.11.2010.7180.6950.5230.649
Percentage of ValuationAllowancesAndReservesBalance100.0100.0100.0100.0100.0100.0

us-gaap:ValuationAllowanceOfDeferredTaxAssets


Valuation
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-312008-12-31
Value68707268171416146.8798.5859.0086.21713
Percentage of ValuationAllowancesAndReservesBalance6252.45889.310071.99851.73426.82241.60.00.00.00.00.00.00.0

Line plots across dimensions of each concept


Gross Margin
us-gaap:StatementBusinessSegments
(None,)
Gross  Marginus-gaap: Statement Business Segments
TTM Greenblatt ROC
_
(None,)
T T M  Greenblatt  R O C_
us-gaap:GrossProfit
us-gaap:StatementBusinessSegments
(None,)
Gross Profitus-gaap: Statement Business Segments
us-gaap:OperatingCostsAndExpenses
us-gaap:StatementBusinessSegments
(None,)
Operating Costs And Expensesus-gaap: Statement Business Segments
us-gaap:Revenues
us-gaap:StatementBusinessSegments
(None,)
Revenuesus-gaap: Statement Business Segments
us-gaap:Revenues
us-gaap:StatementGeographical
(None,)
Revenuesus-gaap: Statement Geographical
us-gaap:Revenues
us-gaap:ProductOrService
(None,)
Revenuesus-gaap: Product Or Service
us-gaap:Assets
us-gaap:StatementGeographical
(None,)
Assetsus-gaap: Statement Geographical
us-gaap:Assets
us-gaap:ConsolidationItems
(None,)
Assetsus-gaap: Consolidation Items
us-gaap:Assets
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments
('us-gaap:OperatingSegments', None)
Assetsus-gaap: Consolidation Items, us-gaap: Statement Business Segments
us-gaap:StockholdersEquity
us-gaap:StatementEquityComponents
(None,)
Stockholders Equityus-gaap: Statement Equity Components
us-gaap:PropertyPlantAndEquipmentGross
us-gaap:PropertyPlantAndEquipmentByType
(None,)
Property Plant And Equipment Grossus-gaap: Property Plant And Equipment By Type
us-gaap:EquitySecuritiesFvNi
us-gaap:FinancialInstrument
(None,)
Equity Securities Fv Nius-gaap: Financial Instrument
us-gaap:StockholdersEquity
us-gaap:StatementEquityComponents
(None,)
Stockholders Equityus-gaap: Statement Equity Components