NG


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

Table of contents



us-gaap:CommonStockValue
us-gaap:StatementEquityComponents
us-gaap:SharesOutstanding

us-gaap:CommonStockSharesIssued

us-gaap:CommonStockSharesAuthorized

us-gaap:CommonStockSharesOutstanding

us-gaap:WeightedAverageNumberOfShareOutstandingBasicAndDiluted

us-gaap:AllocatedShareBasedCompensationExpense
us-gaap:AwardType

us-gaap:ComprehensiveIncomeNetOfTax

us-gaap:GeneralAndAdministrativeExpense

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest

us-gaap:IncomeTaxExpenseBenefit

us-gaap:InterestExpenseDebt

us-gaap:NetIncomeLoss
us-gaap:StatementEquityComponents

us-gaap:NonoperatingIncomeExpense

us-gaap:OperatingExpenses

us-gaap:OperatingIncomeLoss

us-gaap:Assets

us-gaap:Liabilities

us-gaap:LiabilitiesAndStockholdersEquity

us-gaap:StockholdersEquity
us-gaap:StatementEquityComponents

us-gaap:AssetsCurrent
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

us-gaap:CashAndCashEquivalentsAtCarryingValue

us-gaap:OtherAssetsCurrent
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName
us-gaap:PropertyPlantAndEquipmentNet

us-gaap:InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures

us-gaap:OperatingLeaseRightOfUseAsset

us-gaap:OtherAssetsNoncurrent

us-gaap:EquitySecuritiesFvNi

us-gaap:AccountsPayableAndAccruedLiabilitiesCurrent
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

us-gaap:AccruedIncomeTaxesCurrent

us-gaap:LiabilitiesCurrent

us-gaap:OperatingLeaseLiabilityCurrent

us-gaap:OtherLiabilitiesCurrent

us-gaap:DeferredIncomeTaxLiabilitiesNet

us-gaap:OperatingLeaseLiabilityNoncurrent

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFive

us-gaap:OperatingLeaseLiability

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDue

us-gaap:LesseeOperatingLeaseLiabilityUndiscountedExcessAmount

us-gaap:StockholdersEquity
us-gaap:StatementEquityComponents

us-gaap:CommonStockValue

us-gaap:AdditionalPaidInCapital

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:DeferredIncomeTaxExpenseBenefit

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetIncomeLoss
us-gaap:StatementEquityComponents

us-gaap:ShareBasedCompensation

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:PaymentsToAcquireInvestments

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
us-gaap:AwardType
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod

us-gaap:DeferredTaxAssetsNet

us-gaap:DeferredTaxAssetsValuationAllowance

ng:CorporateCommunicationsAndRegulatoryExpense
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName
ng:EquityMethodInvestmentSummarizedFinancialInformationDepreciation
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName
ng:EquityMethodInvestmentSummarizedFinancialInformationMineralPropertyExpenditures

ng:NotesReceivableAccretion
us-gaap:AwardType
ng:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsPerformanceMultiplierOnAwardsVested

ng:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedForfeitureRate
us-gaap:AwardType
ng:SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsPerformanceAdjustment
us-gaap:AwardType, us-gaap:SubsequentEventType
ng:SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodMultiplier

us-gaap:AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation
us-gaap:StatementEquityComponents
us-gaap:LineOfCreditFacility, us-gaap:LongtermDebtType, us-gaap:VariableRate
us-gaap:DebtInstrumentBasisSpreadOnVariableRate1

us-gaap:Depreciation

us-gaap:EffectOfExchangeRateOnCashAndCashEquivalents

us-gaap:EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations

us-gaap:EquitySecuritiesFvNiGainLoss

us-gaap:ForeignCurrencyTransactionGainLossBeforeTax

us-gaap:ForeignCurrencyTransactionGainLossRealized

us-gaap:IncomeLossFromEquityMethodInvestments
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

us-gaap:IncreaseDecreaseInAccountsPayableAndAccruedLiabilities

us-gaap:IncreaseDecreaseInEmployeeRelatedLiabilities

us-gaap:IncreaseDecreaseInOperatingCapital

us-gaap:IncreaseDecreaseInOtherOperatingAssets

us-gaap:InvestmentIncomeInterest

us-gaap:LeaseCost

us-gaap:OperatingLeaseCost

us-gaap:OperatingLeasePayments

us-gaap:OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax

us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
us-gaap:StatementEquityComponents

us-gaap:OtherGeneralExpense

us-gaap:OtherOperatingActivitiesCashFlowStatement

us-gaap:PaymentsRelatedToTaxWithholdingForShareBasedCompensation
us-gaap:AwardType
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName
us-gaap:PaymentsToAcquireEquityMethodInvestments

us-gaap:PaymentsToAcquireInterestInSubsidiariesAndAffiliates

us-gaap:ProceedsFromSaleMaturityAndCollectionsOfInvestments

us-gaap:ProfessionalFees

us-gaap:RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability

us-gaap:SalariesAndWages
us-gaap:AwardType
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross

us-gaap:ShortTermLeaseCost
us-gaap:AwardType
us-gaap:StockIssuedDuringPeriodSharesShareBasedCompensation
us-gaap:AwardType, us-gaap:StatementEquityComponents

us-gaap:StockIssuedDuringPeriodSharesStockOptionsExercised
us-gaap:StatementEquityComponents
us-gaap:AwardType, us-gaap:StatementEquityComponents
us-gaap:StockIssuedDuringPeriodValueShareBasedCompensation
us-gaap:AwardType
us-gaap:StockIssuedDuringPeriodValueShareBasedCompensationGross
us-gaap:StatementEquityComponents
us-gaap:StockIssuedDuringPeriodValueStockOptionsExercised

us-gaap:VariableLeaseCost

ng:DeferredTaxAssetsInvestmentInNoncontrolledAffiliates

ng:DeferredTaxAssetsMineralProperties

ng:DeferredTaxLiabilitiesNotesReceivable
us-gaap:AccountsNotesLoansAndFinancingReceivableByReceivableType
ng:FinancingReceivableAccumulatedAccretion

ng:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFour

ng:OfficeEquipment
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName
ng:ReclamationAndLeaseLiability
us-gaap:Range, us-gaap:AwardType
ng:ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfCommonSharesPerAwardAdjustedMultiplier
us-gaap:AwardType
ng:ShareBasedCompensationArrangementByShareBasedPaymentAwardPortionVestingPerYear

us-gaap:AccountsAndOtherReceivablesNetCurrent
us-gaap:RelatedPartyTransactionsByRelatedParty
us-gaap:AccountsReceivableRelatedParties
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName
us-gaap:AssetsNet

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations

us-gaap:DeferredIncomeTaxLiabilities

us-gaap:DeferredTaxAssetsCapitalLossCarryforwards

us-gaap:DeferredTaxAssetsGoodwillAndIntangibleAssets

us-gaap:DeferredTaxAssetsGross

us-gaap:DeferredTaxAssetsInvestments

us-gaap:DeferredTaxAssetsOperatingLossCarryforwards

us-gaap:DeferredTaxAssetsOther

us-gaap:DeferredTaxAssetsPropertyPlantAndEquipment

us-gaap:DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities

us-gaap:DeferredTaxLiabilitiesPropertyPlantAndEquipment

us-gaap:DepositsAssets

us-gaap:EmployeeRelatedLiabilitiesCurrent
us-gaap:AwardType
us-gaap:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized

us-gaap:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions
dei:LegalEntity, us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName
us-gaap:EquityMethodInvestmentOwnershipPercentage
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName
us-gaap:EquityMethodInvestments
us-gaap:LineOfCreditFacility, us-gaap:LongtermDebtType
us-gaap:InterestPayableCurrentAndNoncurrent

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths

us-gaap:LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear

us-gaap:LongTermNotesPayable

us-gaap:MarketableSecuritiesNoncurrent
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName
us-gaap:MineralPropertiesNet

us-gaap:NotesAndLoansReceivableNetCurrent

us-gaap:NotesAndLoansReceivableNetNoncurrent

us-gaap:NotesPayable
us-gaap:LineOfCreditFacility, us-gaap:LongtermDebtType
us-gaap:AccountsNotesLoansAndFinancingReceivableByReceivableType
us-gaap:NotesReceivableFairValueDisclosure

us-gaap:NotesReceivableNet
us-gaap:IncomeTaxAuthority, us-gaap:IncomeTaxAuthorityName
us-gaap:OperatingLossCarryforwards
us-gaap:IncomeTaxAuthority, us-gaap:IncomeTaxAuthorityName, us-gaap:TaxPeriod

us-gaap:PrepaidExpenseCurrent
us-gaap:AwardType
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue
us-gaap:AwardType
us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueNonvested

us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1
us-gaap:TaxCreditCarryforward
us-gaap:TaxCreditCarryforwardAmount

Plots across concepts


Expenses
Income Tax Expense Benefit
Balance Sheet
Operating Lease Right Of Use Asset
Assets
Operating Lease Right Of Use Asset
Current Assets
Other Assets Current
NonCurrent Assets
Operating Lease Right Of Use Asset
Liabilities
Operating Lease Liability
Current Liabilities
Accrued Income Taxes Current
Stockholders Equity
Retained Earnings Accumulated Deficit
CashFlow
Net Income Loss
NetCashProvidedByUsedInOperatingActivities
Net Income Loss
NetCashProvidedByUsedInInvestingActivities
Net Cash Provided By Used In Investing Activities
OperatingLeaseLiability
Operating Lease Liability Current
LesseeOperatingLeaseLiabilityPaymentsDue
Lessee Operating Lease Liability Undiscounted Excess Amount

Tables

  2021-05-312021-02-282020-11-302020-08-312020-05-312020-02-292019-11-302019-08-312019-05-312019-02-282018-11-302018-08-312018-05-312018-02-282017-11-302017-08-312017-05-312017-02-282016-11-302016-08-312016-05-312016-02-292015-11-302015-08-312015-05-312015-02-282014-11-302014-08-312014-05-312014-02-282013-11-302012-11-30
us-gaap:CommonStockValue ███████████████████████▇▇▇▇▇▇▇▇▁1974.8841974.2661972.0291970.2991970.2991968.2171965.5731964.3041960.9331960.4651954.8611953.3051952.6231952.5641951.5871948.0551947.3921947.1051942.4511942.4511942.2051941.5281938.2621938.0421938.0421938.0421936.3361936.3361936.3361936.3361933.9531462.102
 us-gaap:SharesOutstanding us-gaap:StatementEquityComponents us-gaap:CommonStock██▇▇▇▆▆▅▄▄▃▃▂▂▂▂▂▂▁331.525331.331330.412329.598329.598328.6327.63326.788325.309325.104323.223322.533322.326322.302322.219321.711321.665321.653320.016NANANA317.91NANANA317.288NANANA316.661NA
us-gaap:CommonStockSharesIssued NANA330.4NANANA327.6NANANA323.22284NANANA322.219187NANANA320.016NANANA0.3179NANANA0.317288NANANA316.661279.927
us-gaap:CommonStockSharesAuthorized NANA1000.0NANANA1000.0NANANA1000.0NANANA1000.0NANANA1000.0NANANA1.0NANANA1.0NANANA1000.01000.0
us-gaap:CommonStockSharesOutstanding NANA330.4NANANA327.629928NANANA323.22284NANANA322.219187NANANA320.0NANANA0.3179NANANA0.317288NANANA316.661279.927
us-gaap:WeightedAverageNumberOfShareOutstandingBasicAndDiluted 331.4NANA329.598329.111328.286NA326.05325.245324.749NA322.501322.305322.291NA321.6830.3216620.321428NA0.3199670.3197820.319343NA0.3178620.3178620.31778NA0.3172880.3172950.316932NANA
  2021-05-312021-02-282020-11-302020-08-312020-05-312020-02-292019-11-302019-08-312019-05-312019-02-282018-11-302018-08-312018-05-312018-02-282017-11-302017-08-312017-05-312017-02-282016-11-302016-08-312016-05-312016-02-292015-11-302015-08-312015-05-312015-02-282014-11-302014-08-312014-05-312014-02-282013-11-302012-11-30
  2021-05-312021-02-282020-11-302020-08-312020-05-312020-02-292019-11-302019-08-312019-05-312019-02-282018-11-302018-08-312018-05-312018-02-282017-11-302017-08-312017-05-312017-02-282016-11-302016-08-312016-05-312016-02-292015-11-302015-08-312015-05-312015-02-282014-11-302014-08-312014-05-312014-02-282013-11-302012-11-30
  2021-05-312021-02-282020-11-302020-08-312020-05-312020-02-292019-11-302019-08-312019-05-312019-02-282018-11-302018-08-312018-05-312018-02-282017-11-302017-08-312017-05-312017-02-282016-11-302016-08-312016-05-312016-02-292015-11-302015-08-312015-05-312015-02-282014-11-302014-08-312014-05-312014-02-282013-11-302012-11-30
us-gaap:AllocatedShareBasedCompensationExpense ▂▂▂▂▁▂▁▁▁▁▂▂▂▂▂▂▂▆▂▂▂█2.0952.0421.7981.7831.7151.7611.5511.5521.5421.5311.9161.921.9421.9492.1782.1412.0493.9251.8171.8691.8694.708NANANANANANANANANANA
us-gaap:ComprehensiveIncomeNetOfTax ▇▇▇▇▇▇▇▇▇▇▇▁▆▇▆█▆▇▆▇▇▆▇▆▇▅▆▆▇▆▆-8.827-7.178-6.799-10.391-8.392-7.05-7.841-7.156-6.912-5.804-6.751-104.875-13.001-6.441-18.45912.157-13.425-6.604-14.714-7.4661.12-13.963-11.612-24.345-7.404-41.121-27.028-13.14-2.516-27.459-22.945NA
us-gaap:GeneralAndAdministrativeExpense ▃▄▃▃▃▃▂▂▂▃▃▃▃▃▃▃▃▆▂▂▃▆▂▂▁█▃▃▃▇▆4.9925.3294.8894.7454.3874.7143.6914.0754.2154.344.5044.4084.8964.6854.6394.6464.7866.7314.0724.2224.5617.3244.1734.0623.158.5024.6675.0374.647.7026.758NA
us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest ▄▆▆▃▇▇▆▆█▇█▆▅▆▅▄▆▅▇▇▅▅▇▇▅▅▇▃▄▄▁-10.521-7.956-8.575-12.47-6.969-6.331-7.561-7.797-5.159-5.966-5.852-8.034-9.552-8.149-9.504-10.326-8.364-10.09-7.226-7.307-9.121-9.915-7.029-6.291-9.19-9.289-6.835-12.008-10.637-10.741-15.293NA
us-gaap:IncomeTaxExpenseBenefit NANA-1.5750.2660.2640.2640.3060.2590.3560.3570.3720.0090.0790.0660.5140.0670.0980.0530.1240.0740.0170.0620.1390.01-0.0060.010.2680.0010.044-0.053.896NA
us-gaap:InterestExpenseDebt ▂▁▁▁▁▆▆██▇1.481.4341.4261.4281.41.761.741.8871.8611.798NANANANANANANANANANANANANANANANANANANANANANA
us-gaap:NetIncomeLoss ███▇███████▁███████████████▇██▇▆-10.521-7.956-7.0-12.736-7.233-6.595-7.867-8.056-5.515-6.323-6.294-88.625-9.631-8.215-10.018-10.393-8.462-10.143-7.35-7.381-9.138-9.977-7.168-6.301-9.184-9.299-7.098-12.009-10.681-10.691-19.189-30.224
 us-gaap:NetIncomeLoss us-gaap:StatementEquityComponents us-gaap:RetainedEarnings▁█-10.521-7.956NA-12.736-7.233-6.595NA-8.056-5.515-6.323NA-88.625-9.631-8.215-10.018-10.393-8.462-10.143NANANANANANANANANANANANANANA
us-gaap:NonoperatingIncomeExpense ▃▄▄▃▅▅█▃▅▃▄▂▂▂▃▂▃▂▃▃▂▃▃▄▁▆▄▂▁▄▁-0.705-0.079-0.03-0.9821.6940.8874.025-0.5811.254-0.3030.19-1.112-1.357-1.37-0.751-1.903-0.806-1.127-0.422-0.885-1.73-0.385-0.4440.288-1.9441.9970.821-1.253-2.3730.592-2.122NA
us-gaap:OperatingExpenses ▄▃▃▆▃▂▃▂▂▁▁▂▃▂▄▄▃▄▂▂▃▅▂▂▂▆▃▆▃▆█9.197.2977.97310.8958.0876.2827.527.2166.4135.6636.0426.9228.1956.7798.7538.4237.5588.9636.8046.4227.3919.536.5856.5797.24611.2867.65610.7558.26411.33313.171NA
us-gaap:OperatingIncomeLoss ▆▇▆▅▆█▇▇███▇▆▇▆▆▇▆▇█▇▅▇▇▇▄▇▅▆▄▃▁-9.19-7.297-7.973-10.895-8.087-6.282-7.52-7.216-6.413-5.663-6.042-6.922-8.195-6.779-8.753-8.423-7.558-8.963-6.804-6.422-7.391-9.53-6.585-6.579-7.246-11.286-7.656-10.755-8.264-11.333-13.171-16.361
  2021-05-312021-02-282020-11-302020-08-312020-05-312020-02-292019-11-302019-08-312019-05-312019-02-282018-11-302018-08-312018-05-312018-02-282017-11-302017-08-312017-05-312017-02-282016-11-302016-08-312016-05-312016-02-292015-11-302015-08-312015-05-312015-02-282014-11-302014-08-312014-05-312014-02-282013-11-302012-11-30
  2021-05-312021-02-282020-11-302020-08-312020-05-312020-02-292019-11-302019-08-312019-05-312019-02-282018-11-302018-08-312018-05-312018-02-282017-11-302017-08-312017-05-312017-02-282016-11-302016-08-312016-05-312016-02-292015-11-302015-08-312015-05-312015-02-282014-11-302014-08-312014-05-312014-02-282013-11-302012-11-30
us-gaap:Assets ▁▁▁▁▁▁▁▂▂▂▂▂▄▄▄▄▄▄▄▄▄▄▄▄▅▅▆▆▆▆▆█213.296218.04224.441228.994235.031239.816245.835249.879252.497255.461260.929263.162385.125393.961398.869413.318395.404405.279408.261420.389424.135419.063433.584442.454464.818485.728524.546546.26555.224554.243578.686685.242
us-gaap:Liabilities ▂▂▂▂▂▂▂▂▁▁▁▁▂▂▂▂▂▂▂▂▁▁▁▁▁▂▂▂▂▂▂█115.168113.18113.714113.266110.695108.803107.881105.635102.649100.243100.24197.639116.647114.424114.84113.008109.393107.891107.998107.229105.377103.297104.288103.173102.958117.261119.43115.917113.617112.042113.037208.431
us-gaap:LiabilitiesAndStockholdersEquity ▁▁▁▁▁▁▁▂▂▂▂▂▄▄▄▄▄▄▄▄▄▄▄▄▅▅▆▆▆▆▆█213.296218.04224.441228.994235.031239.816245.835249.879252.497255.461260.929263.162385.125393.961398.869413.318395.404405.279408.261420.389424.135419.063433.584442.454464.818485.728524.546546.26555.224554.243578.686685.242
us-gaap:StockholdersEquity ▁▁▁▁▁▂▂▂▂▂▂▂▄▄▄▅▄▅▅▅▅▅▅▅▆▆▇▇▇▇██98.128104.86110.727115.728124.336131.013137.954144.244149.848155.218160.688165.523268.478279.537284.029300.31286.011297.388300.263313.16318.758315.766329.296339.281361.86368.467405.116430.343441.607442.201465.649476.811
  2021-05-312021-02-282020-11-302020-08-312020-05-312020-02-292019-11-302019-08-312019-05-312019-02-282018-11-302018-08-312018-05-312018-02-282017-11-302017-08-312017-05-312017-02-282016-11-302016-08-312016-05-312016-02-292015-11-302015-08-312015-05-312015-02-282014-11-302014-08-312014-05-312014-02-282013-11-302012-11-30
us-gaap:AssetsCurrent ▅▅▆▆▃▄▄▄▄▄▅▅▁▁▂▂▂▂▂▂▃▃▃▃▃▄▅▅▅▅▆█183.007189.243196.386200.117135.342141.751150.339154.715159.04163.495169.383171.69671.29677.82984.83790.13694.947100.151107.338109.975114.166119.585130.041133.03137.874160.319169.06174.147180.098187.637196.811258.87
us-gaap:CashAndCashEquivalentsAtCarryingValue ▂▂▂▂▂▂▃▂▁▁▁▁▁▁▁▁▁▁▁▁▂▂▂▂▂▃▃▃▃▃▃█51.78863.19360.90645.34853.32959.69967.54953.88117.98622.77721.00413.95618.47720.93127.95421.64221.62318.23930.27428.45531.74336.93841.73144.98749.69666.95770.32570.84471.32972.32281.262254.667
us-gaap:OtherAssetsCurrent ▁▁▂▁▁▁▂▂▃▂▃█▁▁▁▂▂▃▃▂▃▄▅▄▄▅▅▅▅▇█▆0.8541.1361.8691.1581.0131.0521.791.8342.0541.7182.3795.740.8190.8980.8831.5941.4241.9122.0641.522.4232.6473.313.0433.1783.3623.7353.3033.7695.3155.5494.203
  2021-05-312021-02-282020-11-302020-08-312020-05-312020-02-292019-11-302019-08-312019-05-312019-02-282018-11-302018-08-312018-05-312018-02-282017-11-302017-08-312017-05-312017-02-282016-11-302016-08-312016-05-312016-02-292015-11-302015-08-312015-05-312015-02-282014-11-302014-08-312014-05-312014-02-282013-11-302012-11-30
 us-gaap:PropertyPlantAndEquipmentNet us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName ng:DonlinGold███▇▄▃▁1.3641.321.3391.2640.8310.6990.462NANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures █▆▄▇▆▅▃▄▂▁▂4.5723.5922.6144.0053.4622.8721.842.1931.4940.7831.209NANANA1.1NANANANA247.317247.352239.732242.906248.107262.092260.719284.865299.694302.458294.92307.455339.271
us-gaap:OperatingLeaseRightOfUseAsset ▆▆▇▇▇█▁0.5190.5560.60.6480.6780.7350.0NANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:OtherAssetsNoncurrent ▂▂▂▂▂▂▁▁▁▁▁▁▅▆▆▆▅▅▅▆▆▅▅▆▆▆▆▇▇▇▇█2.5592.2492.0362.3211.91.690.9771.1160.9130.9290.8781.1616.2136.4656.5316.5926.1486.3325.8127.0567.0256.2296.2636.6376.926.9047.3788.4528.4788.3718.5999.422
us-gaap:EquitySecuritiesFvNi █▆▄▆▃▁▂▂▁▁▁2.011.6611.4021.6371.1840.9150.9351.0870.8810.8930.839NANANANANANANANANANANANANANANANANANANANANA
  2021-05-312021-02-282020-11-302020-08-312020-05-312020-02-292019-11-302019-08-312019-05-312019-02-282018-11-302018-08-312018-05-312018-02-282017-11-302017-08-312017-05-312017-02-282016-11-302016-08-312016-05-312016-02-292015-11-302015-08-312015-05-312015-02-282014-11-302014-08-312014-05-312014-02-282013-11-302012-11-30
us-gaap:AccountsPayableAndAccruedLiabilitiesCurrent ▁▁▂▂▁▁▂▁▁▁▁▁▁▁▁▄▃▂▄▄▃▂▄▄▃▃▅▄▃▃▅█0.5570.5630.90.9680.5320.5860.880.570.4890.7090.710.7130.7520.5380.7272.5281.8181.2922.8372.4121.6861.3083.0662.5242.1132.0163.4892.9611.8531.7133.4925.708
us-gaap:AccruedIncomeTaxesCurrent NANA0.0050.1390.1390.1390.1380.090.190.190.223NANANA0.136NANANANANANANANANANANANANANANANANA
us-gaap:LiabilitiesCurrent ▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▂▂▂▂▁▁█2.1431.593.5093.1642.161.7823.3433.0052.0751.6973.662.8552.2411.3833.4222.7452.0321.5063.0512.6881.9811.7043.5173.0422.66118.10719.22618.47117.0332.5474.353113.524
us-gaap:OperatingLeaseLiabilityCurrent ███▇▇▇▁0.2210.2130.2070.2010.1920.1880.0NANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:OtherLiabilitiesCurrent ▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▂▂▃▃▄▄▄▅▆▆▇▇█0.1870.1870.1820.1820.1820.1820.1820.1820.1820.1820.1820.1820.1820.1820.1820.2170.2140.2140.2140.2760.2950.3960.4510.5180.5480.5490.6250.7470.8130.8340.8611.0
  2021-05-312021-02-282020-11-302020-08-312020-05-312020-02-292019-11-302019-08-312019-05-312019-02-282018-11-302018-08-312018-05-312018-02-282017-11-302017-08-312017-05-312017-02-282016-11-302016-08-312016-05-312016-02-292015-11-302015-08-312015-05-312015-02-282014-11-302014-08-312014-05-312014-02-282013-11-302012-11-30
us-gaap:DeferredIncomeTaxLiabilitiesNet NANANA1.2721.0970.9240.751NANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:OperatingLeaseLiabilityNoncurrent ▅▆▆▇▇█▁0.310.3550.4040.4550.4910.550.0NANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour NANA0.0920.091NANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFive NANA0.008NANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  2021-05-312021-02-282020-11-302020-08-312020-05-312020-02-292019-11-302019-08-312019-05-312019-02-282018-11-302018-08-312018-05-312018-02-282017-11-302017-08-312017-05-312017-02-282016-11-302016-08-312016-05-312016-02-292015-11-302015-08-312015-05-312015-02-282014-11-302014-08-312014-05-312014-02-282013-11-302012-11-30
us-gaap:StockholdersEquity ▁▁▁▁▁▂▂▂▂▂▂▂▄▄▄▅▄▅▅▅▅▅▅▅▆▆▇▇▇▇██98.128104.86110.727115.728124.336131.013137.954144.244149.848155.218160.688165.523268.478279.537284.029300.31286.011297.388300.263313.16318.758315.766329.296339.281361.86368.467405.116430.343441.607442.201465.649476.811
us-gaap:CommonStockValue ███████████████████████▇▇▇▇▇▇▇▇▁1974.8841974.2661972.0291970.2991970.2991968.2171965.5731964.3041960.9331960.4651954.8611953.3051952.6231952.5641951.5871948.0551947.3921947.1051942.4511942.4511942.2051941.5281938.2621938.0421938.0421938.0421936.3361936.3361936.3361936.3361933.9531462.102
us-gaap:AdditionalPaidInCapital ▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁█81.75480.27781.20381.13579.35279.71982.25481.97283.79182.71787.98787.62786.38984.50683.53484.88883.40981.64882.57380.75679.13477.94180.77479.36777.60176.80474.03872.23770.36168.43966.811454.26
us-gaap:RetainedEarningsAccumulatedDeficit ▁▁▁▂▂▂▂▃▃▃▃▃▅▆▆▆▆▇▇▇▇███-1937.106-1926.585-1918.629-1911.629-1898.893-1891.66-1885.065-1877.198-1869.142-1863.627-1857.682-1851.388-1762.763-1753.132-1744.917-1734.899-1724.506-1716.044-1705.901-1698.551-1691.17-1682.032-1672.055-1664.887NANA-1640.103NANANANANA
us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax ▁▁▁▁▁▁▁▁▁▁▁▁▂▂▂▃▁▂▁▂▂▁▁▂▃▃▄▆▆▅▆█-21.404-23.098-23.876-24.077-26.422-25.263-24.808-24.834-25.734-24.337-24.478-24.021-7.771-4.401-6.1752.266-20.284-15.321-18.86-11.496-11.411-21.671-17.685-13.2414.8033.02334.84554.7755.90147.73664.50497.308
us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue █▁2.0952.042NA1.7831.7151.761NA1.5521.5421.531NA1.921.9421.949NA2.1412.0493.925NANANANANANANANANANANANANANA
  2021-05-312021-02-282020-11-302020-08-312020-05-312020-02-292019-11-302019-08-312019-05-312019-02-282018-11-302018-08-312018-05-312018-02-282017-11-302017-08-312017-05-312017-02-282016-11-302016-08-312016-05-312016-02-292015-11-302015-08-312015-05-312015-02-282014-11-302014-08-312014-05-312014-02-282013-11-302012-11-30
us-gaap:NetCashProvidedByUsedInOperatingActivities ▅▂▄▆▆▃▇█▆▃▅▆▆▁▇▆▆▂-1.976-4.286-2.863-1.826-1.834-3.497-0.843-0.373-1.761-3.15-2.438-1.462-1.85-4.642-0.844-1.679-1.537-4.221NANANANANANANANANANANANANANA
us-gaap:NetCashProvidedByUsedInInvestingActivities ▁▄▅▁▂▂▅█▂▃▄▂▂▂▄▃▃▁-9.9777.05418.307-6.693-4.29-2.614.50736.16-2.9096.1039.539-3.053-0.568-2.397.2241.4614.987-7.668NANANANANANANANANANANANANANA
us-gaap:NetCashProvidedByUsedInFinancingActivities █▅███▁███▃██0.0-0.7310.00.00.0-1.6520.00.00.0-1.1970.00.0NANANANA0.0-0.196NANANANANANANANANANANANANANA
us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect ▁▃▅▂▂▂▅█▂▃▄▂▂▂-11.4052.28715.558-7.981-6.37-7.8513.66835.895-4.7911.7737.048-4.521-2.454-7.023NANANANANANANANANANANANANANANANANANA
  2021-05-312021-02-282020-11-302020-08-312020-05-312020-02-292019-11-302019-08-312019-05-312019-02-282018-11-302018-08-312018-05-312018-02-282017-11-302017-08-312017-05-312017-02-282016-11-302016-08-312016-05-312016-02-292015-11-302015-08-312015-05-312015-02-282014-11-302014-08-312014-05-312014-02-282013-11-302012-11-30
us-gaap:DeferredIncomeTaxExpenseBenefit NANA-1.2720.1750.1730.1730.1680.1690.1670.1670.121-0.0060.0240.011NANANANA0.023-0.006-0.083-0.003-0.0160.01-0.0060.010.0790.0010.044-0.053.606NA
us-gaap:NetCashProvidedByUsedInOperatingActivities ▅▂▄▆▆▃▇█▆▃▅▆▆▁▇▆▆▂-1.976-4.286-2.863-1.826-1.834-3.497-0.843-0.373-1.761-3.15-2.438-1.462-1.85-4.642-0.844-1.679-1.537-4.221NANANANANANANANANANANANANANA
us-gaap:NetIncomeLoss ███▇███████▁███████████████▇██▇▆-10.521-7.956-7.0-12.736-7.233-6.595-7.867-8.056-5.515-6.323-6.294-88.625-9.631-8.215-10.018-10.393-8.462-10.143-7.35-7.381-9.138-9.977-7.168-6.301-9.184-9.299-7.098-12.009-10.681-10.691-19.189-30.224
 us-gaap:NetIncomeLoss us-gaap:StatementEquityComponents us-gaap:RetainedEarnings▁█-10.521-7.956NA-12.736-7.233-6.595NA-8.056-5.515-6.323NA-88.625-9.631-8.215-10.018-10.393-8.462-10.143NANANANANANANANANANANANANANA
us-gaap:ShareBasedCompensation ▃▃▃▃▃▃▂▂▂▂▃▃▃▃▃▃▃▆▃▃▃▇▃▂▁█▃▃▃▇▅2.0952.0421.7981.7831.7151.7611.5511.5521.5421.5311.9161.921.9421.9492.1782.1412.0493.9251.8171.8691.8694.7081.7581.6730.7285.3291.7461.8861.9074.6583.531NA
  2021-05-312021-02-282020-11-302020-08-312020-05-312020-02-292019-11-302019-08-312019-05-312019-02-282018-11-302018-08-312018-05-312018-02-282017-11-302017-08-312017-05-312017-02-282016-11-302016-08-312016-05-312016-02-292015-11-302015-08-312015-05-312015-02-282014-11-302014-08-312014-05-312014-02-282013-11-302012-11-30
us-gaap:NetCashProvidedByUsedInInvestingActivities ▁▄▅▁▂▂▅█▂▃▄▂▂▂▄▃▃▁-9.9777.05418.307-6.693-4.29-2.614.50736.16-2.9096.1039.539-3.053-0.568-2.397.2241.4614.987-7.668NANANANANANANANANANANANANANA
us-gaap:PaymentsToAcquireInvestments ▃▂▂▁▂▃▃▁▂▇▁█▂▂▃▁▄▄▁▁▄▃30.79925.015.00.011.035.035.0-0.011.0108.00.0120.017.015.041.00.046.945.05.05.045.035.0NANANANANANANANANANA
  2021-05-312021-02-282020-11-302020-08-312020-05-312020-02-292019-11-302019-08-312019-05-312019-02-282018-11-302018-08-312018-05-312018-02-282017-11-302017-08-312017-05-312017-02-282016-11-302016-08-312016-05-312016-02-292015-11-302015-08-312015-05-312015-02-282014-11-302014-08-312014-05-312014-02-282013-11-302012-11-30
us-gaap:NetCashProvidedByUsedInFinancingActivities █▅███▁███▃██0.0-0.7310.00.00.0-1.6520.00.00.0-1.1970.00.0NANANANA0.0-0.196NANANANANANANANANANANANANANA
  2021-05-312021-02-282020-11-302020-08-312020-05-312020-02-292019-11-302019-08-312019-05-312019-02-282018-11-302018-08-312018-05-312018-02-282017-11-302017-08-312017-05-312017-02-282016-11-302016-08-312016-05-312016-02-292015-11-302015-08-312015-05-312015-02-282014-11-302014-08-312014-05-312014-02-282013-11-302012-11-30

Common Stock Value

us-gaap:CommonStockValue

us-gaap:CommonStockValue


Common
Period End2021-05-312021-02-282020-11-302020-08-312020-05-312020-02-292019-11-302019-08-312019-05-312019-02-282018-11-302018-08-312018-05-312018-02-282017-11-302017-08-312017-05-312017-02-282016-11-302016-08-312016-05-312016-02-292015-11-302015-08-312015-05-312015-02-282014-11-302014-08-312014-05-312014-02-282013-11-302012-11-30
Value19741974197219701970196819651964196019601954195319521952195119481947194719421942194219411938193819381938193619361936193619331462
Percentage of CommonStockValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets925.9905.5878.6860.4838.3820.7799.5786.1776.6767.4749.2742.2507.0495.6489.3471.3492.5480.4475.8462.1457.9463.3447.0438.0416.9399.0369.1354.5348.7349.4334.2213.4

Shares Outstanding

us-gaap:SharesOutstanding us-gaap:StatementEquityComponents

us-gaap:SharesOutstanding

us-gaap:CommonStock


Shares
Period End2021-05-312021-02-282020-11-302020-08-312020-05-312020-02-292019-11-302019-08-312019-05-312019-02-282018-11-302018-08-312018-05-312018-02-282017-11-302017-08-312017-05-312017-02-282016-11-302015-11-302014-11-302013-11-30
Value331331330329329328327326325325323322322322322321321321320317317316
Percentage of SharesOutstanding100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Common Stock Shares Issued

us-gaap:CommonStockSharesIssued

us-gaap:CommonStockSharesIssued


Common
Period End2020-11-302019-11-302018-11-302017-11-302016-11-302015-11-302014-11-302013-11-302012-11-30
Value3303273233223200.31790.317288316279
Percentage of CommonStockSharesIssued100.0100.0100.0100.0100.0100.0100.0100.0100.0

Common Stock Shares Authorized

us-gaap:CommonStockSharesAuthorized

us-gaap:CommonStockSharesAuthorized


Common
Period End2020-11-302019-11-302018-11-302017-11-302016-11-302015-11-302014-11-302013-11-302012-11-30
Value100010001000100010001.01.010001000
Percentage of CommonStockSharesAuthorized100.0100.0100.0100.0100.0100.0100.0100.0100.0

Common Stock Shares Outstanding

us-gaap:CommonStockSharesOutstanding

us-gaap:CommonStockSharesOutstanding


Common
Period End2020-11-302019-11-302018-11-302017-11-302016-11-302015-11-302014-11-302013-11-302012-11-30
Value3303273233223200.31790.317288316279
Percentage of CommonStockSharesOutstanding100.0100.0100.0100.0100.0100.0100.0100.0100.0

Weighted Average Number Of Share Outstanding Basic And Diluted

us-gaap:WeightedAverageNumberOfShareOutstandingBasicAndDiluted

us-gaap:WeightedAverageNumberOfShareOutstandingBasicAndDiluted


Weighted
Period End2021-05-312020-08-312020-05-312020-02-292019-08-312019-05-312019-02-282018-08-312018-05-312018-02-282017-08-312017-05-312017-02-282016-08-312016-05-312016-02-292015-08-312015-05-312015-02-282014-08-312014-05-312014-02-282013-08-312013-05-312013-02-28
Value3313293293283263253243223223223210.3216620.3214280.3199670.3197820.3193430.3178620.3178620.317780.3172880.3172950.3169320.3166390.3166340.303126
Percentage of WeightedAverageNumberOfShareOutstandingBasicAndDiluted100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Allocated Share Based Compensation Expense

us-gaap:AllocatedShareBasedCompensationExpense

us-gaap:AllocatedShareBasedCompensationExpense


Allocated
Period End2021-05-312021-02-282020-11-302020-08-312020-05-312020-02-292019-11-302019-08-312019-05-312019-02-282018-11-302018-08-312018-05-312018-02-282017-11-302017-08-312017-05-312017-02-282016-11-302016-08-312016-05-312016-02-29
Value2.0952.0421.7981.7831.7151.7611.5511.5521.5421.5311.9161.921.9421.9492.1782.1412.0493.9251.8171.8691.8694.708
Percentage of AllocatedShareBasedCompensationExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AllocatedShareBasedCompensationExpense us-gaap:AwardType

ng:DeferredShareUnits


Allocated
Period End2021-05-312021-02-282020-11-302020-08-312020-05-312020-02-292019-11-302019-08-312019-05-312019-02-282018-11-302018-08-312018-05-312018-02-282017-11-302017-08-312017-05-312017-02-282016-11-302016-08-312016-05-312016-02-29
Value0.0590.0530.0510.0520.0490.0490.040.0390.0440.0390.0410.040.0470.0490.0490.0510.0520.0570.0580.0580.0570.051
Percentage of AllocatedShareBasedCompensationExpense2.82.62.82.92.92.82.62.52.92.52.12.12.42.52.22.42.51.53.23.13.01.1
Percentage of Revenues0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Revenues ng:DeferredShareUnits0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

ng:PerformanceShareUnits


Allocated
Period End2021-05-312021-02-282020-11-302020-08-312020-05-312020-02-292019-11-302019-08-312019-05-312019-02-282018-11-302018-08-312018-05-312018-02-282017-11-302017-08-312017-05-312017-02-282016-11-302016-08-312016-05-312016-02-29
Value0.8290.7960.6340.6360.6330.6440.5820.5850.5830.570.9350.9390.9570.9521.1881.1711.1191.111.0421.0771.0760.989
Percentage of AllocatedShareBasedCompensationExpense39.639.035.335.736.936.637.537.737.837.248.848.949.348.854.554.754.628.357.357.657.621.0
Percentage of Revenues0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Revenues ng:PerformanceShareUnits0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:EmployeeStockOption


Allocated
Period End2021-05-312021-02-282020-11-302020-08-312020-05-312020-02-292019-11-302019-08-312019-05-312019-02-282018-11-302018-08-312018-05-312018-02-282017-11-302017-08-312017-05-312017-02-282016-11-302016-08-312016-05-312016-02-29
Value1.2071.1931.1131.0951.0331.0680.9290.9280.9150.9220.940.9410.9380.9480.9410.9190.8782.7580.7170.7340.7363.668
Percentage of AllocatedShareBasedCompensationExpense57.658.461.961.460.260.659.959.859.360.249.149.048.348.643.242.942.970.339.539.339.477.9
Percentage of Revenues0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Revenues us-gaap:EmployeeStockOption0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Comprehensive Income Net Of Tax

us-gaap:ComprehensiveIncomeNetOfTax

us-gaap:ComprehensiveIncomeNetOfTax


Comprehensive
Period End2021-05-312021-02-282020-11-302020-08-312020-05-312020-02-292019-11-302019-08-312019-05-312019-02-282018-11-302018-08-312018-05-312018-02-282017-11-302017-08-312017-05-312017-02-282016-11-302016-08-312016-05-312016-02-292015-11-302015-08-312015-05-312015-02-282014-11-302014-08-312014-05-312014-02-282013-11-302013-08-312013-05-312013-02-28
Value-8.827-7.178-6.799-10.391-8.392-7.05-7.841-7.156-6.912-5.804-6.751-104.875-13.001-6.441-18.45912-13.425-6.604-14.714-7.4661.12-13.963-11.612-24.345-7.404-41.121-27.028-13.14-2.516-27.459-22.945-23.42-13.199-36.0
Percentage of ComprehensiveIncomeNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

General And Administrative Expense

us-gaap:GeneralAndAdministrativeExpense

us-gaap:GeneralAndAdministrativeExpense


General
Period End2021-05-312021-02-282020-11-302020-08-312020-05-312020-02-292019-11-302019-08-312019-05-312019-02-282018-11-302018-08-312018-05-312018-02-282017-11-302017-08-312017-05-312017-02-282016-11-302016-08-312016-05-312016-02-292015-11-302015-08-312015-05-312015-02-282014-11-302014-08-312014-05-312014-02-282013-11-302013-08-312013-05-312013-02-28
Value4.9925.3294.8894.7454.3874.7143.6914.0754.2154.344.5044.4084.8964.6854.6394.6464.7866.7314.0724.2224.5617.3244.1734.0623.158.5024.6675.0374.647.7026.7585.2395.9789.016
Percentage of GeneralAndAdministrativeExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

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

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest


Income
Period End2021-05-312021-02-282020-11-302020-08-312020-05-312020-02-292019-11-302019-08-312019-05-312019-02-282018-11-302018-08-312018-05-312018-02-282017-11-302017-08-312017-05-312017-02-282016-11-302016-08-312016-05-312016-02-292015-11-302015-08-312015-05-312015-02-282014-11-302014-08-312014-05-312014-02-282013-11-302013-08-312013-05-312013-02-28
Value-10.521-7.956-8.575-12.47-6.969-6.331-7.561-7.797-5.159-5.966-5.852-8.034-9.552-8.149-9.504-10.326-8.364-10.09-7.226-7.307-9.121-9.915-7.029-6.291-9.19-9.289-6.835-12.008-10.637-10.741-15.293-19.962-9.833-13.776
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Income Tax Expense Benefit

us-gaap:IncomeTaxExpenseBenefit

us-gaap:IncomeTaxExpenseBenefit


Income
Period End2020-11-302020-08-312020-05-312020-02-292019-11-302019-08-312019-05-312019-02-282018-11-302018-08-312018-05-312018-02-282017-11-302017-08-312017-05-312017-02-282016-11-302016-08-312016-05-312016-02-292015-11-302015-08-312015-05-312015-02-282014-11-302014-08-312014-05-312014-02-282013-11-302013-08-31
Value-1.5750.2660.2640.2640.3060.2590.3560.3570.3720.0090.0790.0660.5140.0670.0980.0530.1240.0740.0170.0620.1390.01-0.0060.010.2680.0010.044-0.053.8960.0
Percentage of IncomeTaxExpenseBenefit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0
Percentage of Revenues0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Interest Expense Debt

us-gaap:InterestExpenseDebt

us-gaap:InterestExpenseDebt


Interest
Period End2021-05-312021-02-282020-11-302020-08-312020-05-312020-02-292019-11-302019-08-312019-05-312019-02-28
Value1480000.01434000.01426000.01428000.01400000.01760000.01740000.01887000.01861000.01798000.0
Percentage of InterestExpenseDebt100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues0.00.00.00.00.00.00.00.00.00.0

Net Income Loss

us-gaap:NetIncomeLoss

us-gaap:NetIncomeLoss


Net
Period End2021-05-312021-02-282020-11-302020-08-312020-05-312020-02-292019-11-302019-08-312019-05-312019-02-282018-11-302018-08-312018-05-312018-02-282017-11-302017-08-312017-05-312017-02-282016-11-302016-08-312016-05-312016-02-292015-11-302015-08-312015-05-312015-02-282014-11-302014-08-312014-05-312014-02-282013-11-302013-08-312013-05-312013-02-282012-11-302012-08-312012-05-312012-02-29
Value-10.521-7.956-7.0-12.736-7.233-6.595-7.867-8.056-5.515-6.323-6.294-88.625-9.631-8.215-10.018-10.393-8.462-10.143-7.35-7.381-9.138-9.977-7.168-6.301-9.184-9.299-7.098-12.009-10.681-10.691-19.189-19.962-9.833-13.776-30.224-12.3961515
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 Revenues0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:NetIncomeLoss us-gaap:StatementEquityComponents

us-gaap:RetainedEarnings


Net
Period End2021-05-312021-02-282020-08-312020-05-312020-02-292019-08-312019-05-312019-02-282018-08-312018-05-312018-02-282017-11-302017-08-312017-05-312017-02-28
Value-10.521-7.956-12.736-7.233-6.595-8.056-5.515-6.323-88.625-9.631-8.215-10.018-10.393-8.462-10.143
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Revenues us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Nonoperating Income Expense

us-gaap:NonoperatingIncomeExpense

us-gaap:NonoperatingIncomeExpense


Nonoperating
Period End2021-05-312021-02-282020-11-302020-08-312020-05-312020-02-292019-11-302019-08-312019-05-312019-02-282018-11-302018-08-312018-05-312018-02-282017-11-302017-08-312017-05-312017-02-282016-11-302016-08-312016-05-312016-02-292015-11-302015-08-312015-05-312015-02-282014-11-302014-08-312014-05-312014-02-282013-11-302013-08-312013-05-312013-02-28
Value-0.705-0.079-0.03-0.9821.6940.8874.025-0.5811.254-0.3030.19-1.112-1.357-1.37-0.751-1.903-0.806-1.127-0.422-0.885-1.73-0.385-0.4440.288-1.9441.9970.821-1.253-2.3730.592-2.122-4.0912.3920.733
Percentage of NonoperatingIncomeExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Operating Expenses

us-gaap:OperatingExpenses

us-gaap:OperatingExpenses


Operating
Period End2021-05-312021-02-282020-11-302020-08-312020-05-312020-02-292019-11-302019-08-312019-05-312019-02-282018-11-302018-08-312018-05-312018-02-282017-11-302017-08-312017-05-312017-02-282016-11-302016-08-312016-05-312016-02-292015-11-302015-08-312015-05-312015-02-282014-11-302014-08-312014-05-312014-02-282013-11-302013-08-312013-05-312013-02-28
Value9.197.2977.973108.0876.2827.527.2166.4135.6636.0426.9228.1956.7798.7538.4237.5588.9636.8046.4227.3919.536.5856.5797.246117.656108.2641113151214
Percentage of OperatingExpenses100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Operating Income Loss

us-gaap:OperatingIncomeLoss

us-gaap:OperatingIncomeLoss


Operating
Period End2021-05-312021-02-282020-11-302020-08-312020-05-312020-02-292019-11-302019-08-312019-05-312019-02-282018-11-302018-08-312018-05-312018-02-282017-11-302017-08-312017-05-312017-02-282016-11-302016-08-312016-05-312016-02-292015-11-302015-08-312015-05-312015-02-282014-11-302014-08-312014-05-312014-02-282013-11-302013-08-312013-05-312013-02-282012-11-302012-08-312012-05-312012-02-29
Value-9190000.0-7297000.0-7973000.0-10895000.0-8087000.0-6282000.0-7520000.0-7216000.0-6413000.0-5663000.0-6042000.0-6922000.0-8195000.0-6779000.0-8753000.0-8423000.0-7558000.0-8963000.0-6804000.0-6422000.0-7391000.0-9530000.0-6585000.0-6579000.0-7246000.0-11286000.0-7656000.0-10755000.0-8264000.0-11333000.0-13171000.0-15871000.0-12225000.0-14509000.0-16361000.0-23851000.0-17315000.0-22415000.0
Percentage of OperatingIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Assets

us-gaap:Assets

us-gaap:Assets


Assets
Period End2021-05-312021-02-282020-11-302020-08-312020-05-312020-02-292019-11-302019-08-312019-05-312019-02-282018-11-302018-08-312018-05-312018-02-282017-11-302017-08-312017-05-312017-02-282016-11-302016-08-312016-05-312016-02-292015-11-302015-08-312015-05-312015-02-282014-11-302014-08-312014-05-312014-02-282013-11-302012-11-30
Value213218224228235239245249252255260263385393398413395405408420424419433442464485524546555554578685
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Liabilities

us-gaap:Liabilities

us-gaap:Liabilities


Liabilities
Period End2021-05-312021-02-282020-11-302020-08-312020-05-312020-02-292019-11-302019-08-312019-05-312019-02-282018-11-302018-08-312018-05-312018-02-282017-11-302017-08-312017-05-312017-02-282016-11-302016-08-312016-05-312016-02-292015-11-302015-08-312015-05-312015-02-282014-11-302014-08-312014-05-312014-02-282013-11-302012-11-30
Value11511311311311010810710510210010097116114114113109107107107105103104103102117119115113112113208
Percentage of Liabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets54.051.950.749.547.145.443.942.340.739.238.437.130.329.028.827.327.726.626.525.524.824.624.123.322.224.122.821.220.520.219.530.4

Liabilities And Stockholders Equity

us-gaap:LiabilitiesAndStockholdersEquity

us-gaap:LiabilitiesAndStockholdersEquity


Liabilities
Period End2021-05-312021-02-282020-11-302020-08-312020-05-312020-02-292019-11-302019-08-312019-05-312019-02-282018-11-302018-08-312018-05-312018-02-282017-11-302017-08-312017-05-312017-02-282016-11-302016-08-312016-05-312016-02-292015-11-302015-08-312015-05-312015-02-282014-11-302014-08-312014-05-312014-02-282013-11-302012-11-30
Value213218224228235239245249252255260263385393398413395405408420424419433442464485524546555554578685
Percentage of LiabilitiesAndStockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Stockholders Equity

us-gaap:StockholdersEquity

us-gaap:StockholdersEquity


Stockholders
Period End2021-05-312021-02-282020-11-302020-08-312020-05-312020-02-292019-11-302019-08-312019-05-312019-02-282018-11-302018-08-312018-05-312018-02-282017-11-302017-08-312017-05-312017-02-282016-11-302016-08-312016-05-312016-02-292015-11-302015-08-312015-05-312015-02-282014-11-302014-08-312014-05-312014-02-282013-11-302012-11-30
Value98104110115124131137144149155160165268279284300286297300313318315329339361368405430441442465476
Percentage of StockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets46.048.149.350.552.954.656.157.759.360.861.662.969.771.071.272.772.373.473.574.575.275.475.976.777.875.977.278.879.579.880.569.6

us-gaap:StockholdersEquity us-gaap:StatementEquityComponents

us-gaap:AccumulatedOtherComprehensiveIncome


Stockholders
Period End2021-05-312021-02-282020-11-302020-08-312020-05-312020-02-292019-11-302019-08-312019-05-312019-02-282018-11-302018-08-312018-05-312018-02-282017-11-302017-08-312017-05-312017-02-282016-11-302015-11-302014-11-302013-11-30
Value-21.404-23.098-23.876-24.077-26.422-25.263-24.808-24.834-25.734-24.337-24.478-24.021-7.771-4.401-6.1752.266-20.284-15.321-18.86-17.6853464
Percentage of StockholdersEquity-21.8-22.0-21.6-20.8-21.3-19.3-18.0-17.2-17.2-15.7-15.2-14.5-2.9-1.6-2.20.8-7.1-5.2-6.3-5.48.613.9
Percentage of Assets-10.0-10.6-10.6-10.5-11.2-10.5-10.1-9.9-10.2-9.5-9.4-9.1-2.0-1.1-1.50.5-5.1-3.8-4.6-4.16.611.1
Percentage of Assets us-gaap:AccumulatedOtherComprehensiveIncome0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AdditionalPaidInCapital


Stockholders
Period End2021-05-312021-02-282020-11-302020-08-312020-05-312020-02-292019-11-302019-08-312019-05-312019-02-282018-11-302018-08-312018-05-312018-02-282017-11-302017-08-312017-05-312017-02-282016-11-302015-11-302014-11-302013-11-30
Value81808181797982818382878786848384838182807466
Percentage of StockholdersEquity83.376.673.370.163.860.859.656.855.953.354.852.932.230.229.428.329.227.527.524.518.314.3
Percentage of Assets38.336.836.235.433.833.233.532.833.232.433.733.322.421.520.920.521.120.120.218.614.111.5
Percentage of Assets us-gaap:AdditionalPaidInCapital0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:CommonStock


Stockholders
Period End2021-05-312021-02-282020-11-302020-08-312020-05-312020-02-292019-11-302019-08-312019-05-312019-02-282018-11-302018-08-312018-05-312018-02-282017-11-302017-08-312017-05-312017-02-282016-11-302015-11-302014-11-302013-11-30
Value1974197419721970197019681965196419601960195419531952195219511948194719471942193819361933
Percentage of StockholdersEquity2012.61882.81781.01702.51584.71502.31424.81361.81308.61263.01216.61180.1727.3698.5687.1648.7680.9654.7646.9588.6478.0415.3
Percentage of Assets925.9905.5878.6860.4838.3820.7799.5786.1776.6767.4749.2742.2507.0495.6489.3471.3492.5480.4475.8447.0369.1334.2
Percentage of Assets us-gaap:CommonStock0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:RetainedEarnings


Stockholders
Period End2021-05-312021-02-282020-11-302020-08-312020-05-312020-02-292019-11-302019-08-312019-05-312019-02-282018-11-302018-08-312018-05-312018-02-282017-11-302017-08-312017-05-312017-02-282016-11-302015-11-302014-11-302013-11-30
Value-1937.106-1926.585-1918.629-1911.629-1898.893-1891.66-1885.065-1877.198-1869.142-1863.627-1857.682-1851.388-1762.763-1753.132-1744.917-1734.899-1724.506-1716.044-1705.901-1672.055-1640.103-1599.619
Percentage of StockholdersEquity-1974.1-1837.3-1732.8-1651.8-1527.2-1443.9-1366.4-1301.4-1247.4-1200.7-1156.1-1118.5-656.6-627.2-614.3-577.7-603.0-577.0-568.1-507.8-404.8-343.5
Percentage of Assets-908.2-883.6-854.8-834.8-807.9-788.8-766.8-751.2-740.3-729.5-711.9-703.5-457.7-445.0-437.5-419.7-436.1-423.4-417.8-385.6-312.7-276.4
Percentage of Assets us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Assets Current

us-gaap:AssetsCurrent

us-gaap:AssetsCurrent


Assets
Period End2021-05-312021-02-282020-11-302020-08-312020-05-312020-02-292019-11-302019-08-312019-05-312019-02-282018-11-302018-08-312018-05-312018-02-282017-11-302017-08-312017-05-312017-02-282016-11-302016-08-312016-05-312016-02-292015-11-302015-08-312015-05-312015-02-282014-11-302014-08-312014-05-312014-02-282013-11-302012-11-30
Value1831891962001351411501541591631691717177849094100107109114119130133137160169174180187196258
Percentage of AssetsCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets85.886.887.587.457.659.161.261.963.064.064.965.218.519.821.321.824.024.726.326.226.928.530.030.129.733.032.231.932.433.934.037.8

us-gaap:AssetsCurrent us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

ng:DonlinGold


Assets
Period End2021-05-312021-02-282020-11-302020-08-312020-05-312020-02-292019-11-30
Value6.6663.6722.6545.5314.6123.3773.115
Percentage of AssetsCurrent3.61.91.42.83.42.42.1
Percentage of Assets3.11.71.22.42.01.41.3
Percentage of Assets ng:DonlinGold0.00.00.00.00.00.00.0

Cash And Cash Equivalents At Carrying Value

us-gaap:CashAndCashEquivalentsAtCarryingValue

us-gaap:CashAndCashEquivalentsAtCarryingValue


Cash
Period End2021-05-312021-02-282020-11-302020-08-312020-05-312020-02-292019-11-302019-08-312019-05-312019-02-282018-11-302018-08-312018-05-312018-02-282017-11-302017-08-312017-05-312017-02-282016-11-302016-08-312016-05-312016-02-292015-11-302015-08-312015-05-312015-02-282014-11-302014-08-312014-05-312014-02-282013-11-302013-08-312013-05-312013-02-282012-11-302011-11-302010-11-30
Value516360455359675317222113182027212118302831364144496670707172819521429925459147
Percentage of CashAndCashEquivalentsAtCarryingValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets24.329.027.119.822.724.927.521.67.18.98.05.34.85.37.05.25.54.57.46.87.58.89.610.210.713.813.413.012.813.014.00.00.00.037.20.00.0

Other Assets Current

us-gaap:OtherAssetsCurrent

us-gaap:OtherAssetsCurrent


Other
Period End2021-05-312021-02-282020-11-302020-08-312020-05-312020-02-292019-11-302019-08-312019-05-312019-02-282018-11-302018-08-312018-05-312018-02-282017-11-302017-08-312017-05-312017-02-282016-11-302016-08-312016-05-312016-02-292015-11-302015-08-312015-05-312015-02-282014-11-302014-08-312014-05-312014-02-282013-11-302012-11-30
Value854000.01136000.01869000.01158000.01013000.01052000.01790000.01834000.02054000.01718000.02379000.05740000.0819000.0898000.0883000.01594000.01424000.01912000.02064000.01520000.02423000.02647000.03310000.03043000.03178000.03362000.03735000.03303000.03769000.05315000.05549000.04203000.0
Percentage of OtherAssetsCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.40.50.80.50.40.40.70.70.80.70.92.20.20.20.20.40.40.50.50.40.60.60.80.70.70.70.70.60.71.01.00.6

Property Plant And Equipment Net

us-gaap:PropertyPlantAndEquipmentNet us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

us-gaap:PropertyPlantAndEquipmentNet

ng:DonlinGold


Property
Period End2021-05-312021-02-282020-11-302020-08-312020-05-312020-02-292019-11-30
Value1364000.01320000.01339000.01264000.0831000.0699000.0462000.0
Percentage of PropertyPlantAndEquipmentNet100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.60.60.60.60.40.30.2
Percentage of Assets ng:DonlinGold0.00.00.00.00.00.00.0

Investments In Affiliates Subsidiaries Associates And Joint Ventures

us-gaap:InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures

us-gaap:InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures


Investments
Period End2021-05-312021-02-282020-11-302020-08-312020-05-312020-02-292019-11-302019-08-312019-05-312019-02-282018-11-302017-11-302016-08-312016-05-312016-02-292015-11-302015-08-312015-05-312015-02-282014-11-302014-08-312014-05-312014-02-282013-11-302012-11-30
Value4.5723.5922.6144.0053.4622.8721.842.1931.4940.7831.2091.1247247239242248262260284299302294307339
Percentage of InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets2.11.61.21.71.51.20.70.90.60.30.50.358.858.357.256.056.156.453.754.354.954.553.253.149.5

Operating Lease Right Of Use Asset

us-gaap:OperatingLeaseRightOfUseAsset

us-gaap:OperatingLeaseRightOfUseAsset


Operating
Period End2021-05-312021-02-282020-11-302020-08-312020-05-312020-02-292019-11-30
Value519000.0556000.0600000.0648000.0678000.0735000.00
Percentage of OperatingLeaseRightOfUseAsset100.0100.0100.0100.0100.0100.00.0
Percentage of Assets0.20.30.30.30.30.30.0

Other Assets Noncurrent

us-gaap:OtherAssetsNoncurrent

us-gaap:OtherAssetsNoncurrent


Other
Period End2021-05-312021-02-282020-11-302020-08-312020-05-312020-02-292019-11-302019-08-312019-05-312019-02-282018-11-302018-08-312018-05-312018-02-282017-11-302017-08-312017-05-312017-02-282016-11-302016-08-312016-05-312016-02-292015-11-302015-08-312015-05-312015-02-282014-11-302014-08-312014-05-312014-02-282013-11-302012-11-30
Value2559000.02249000.02036000.02321000.01900000.01690000.0977000.01116000.0913000.0929000.0878000.01161000.06213000.06465000.06531000.06592000.06148000.06332000.05812000.07056000.07025000.06229000.06263000.06637000.06920000.06904000.07378000.08452000.08478000.08371000.08599000.09422000.0
Percentage of OtherAssetsNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets1.21.00.91.00.80.70.40.40.40.40.30.41.61.61.61.61.61.61.41.71.71.51.41.51.51.41.41.51.51.51.51.4

Equity Securities Fv Ni

us-gaap:EquitySecuritiesFvNi

us-gaap:EquitySecuritiesFvNi


Equity
Period End2021-05-312021-02-282020-11-302020-08-312020-05-312020-02-292019-11-302019-08-312019-05-312019-02-282018-11-30
Value2010000.01661000.01402000.01637000.01184000.0915000.0935000.01087000.0881000.0893000.0839000.0
Percentage of EquitySecuritiesFvNi100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.90.80.60.70.50.40.40.40.30.30.3

Accounts Payable And Accrued Liabilities Current

us-gaap:AccountsPayableAndAccruedLiabilitiesCurrent

us-gaap:AccountsPayableAndAccruedLiabilitiesCurrent


Accounts
Period End2021-05-312021-02-282020-11-302020-08-312020-05-312020-02-292019-11-302019-08-312019-05-312019-02-282018-11-302018-08-312018-05-312018-02-282017-11-302017-08-312017-05-312017-02-282016-11-302016-08-312016-05-312016-02-292015-11-302015-08-312015-05-312015-02-282014-11-302014-08-312014-05-312014-02-282013-11-302012-11-30
Value557000.0563000.0900000.0968000.0532000.0586000.0880000.0570000.0489000.0709000.0710000.0713000.0752000.0538000.0727000.02528000.01818000.01292000.02837000.02412000.01686000.01308000.03066000.02524000.02113000.02016000.03489000.02961000.01853000.01713000.03492000.05708000.0
Percentage of AccountsPayableAndAccruedLiabilitiesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.30.30.40.40.20.20.40.20.20.30.30.30.20.10.20.60.50.30.70.60.40.30.70.60.50.40.70.50.30.30.60.8

us-gaap:AccountsPayableAndAccruedLiabilitiesCurrent us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

ng:DonlinGold


Accounts
Period End2021-05-312021-02-282020-11-302020-08-312020-05-312020-02-292019-11-30
Value3385000.01307000.01271000.02645000.01816000.01076000.01737000.0
Percentage of AccountsPayableAndAccruedLiabilitiesCurrent607.7232.1141.2273.2341.4183.6197.4
Percentage of Assets1.60.60.61.20.80.40.7
Percentage of Assets ng:DonlinGold0.00.00.00.00.00.00.0

Accrued Income Taxes Current

us-gaap:AccruedIncomeTaxesCurrent

us-gaap:AccruedIncomeTaxesCurrent


Accrued
Period End2020-11-302020-08-312020-05-312020-02-292019-11-302019-08-312019-05-312019-02-282018-11-302017-11-30
Value5000.0139000.0139000.0139000.0138000.090000.0190000.0190000.0223000.0136000.0
Percentage of AccruedIncomeTaxesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.10.10.10.10.00.10.10.10.0

Liabilities Current

us-gaap:LiabilitiesCurrent

us-gaap:LiabilitiesCurrent


Liabilities
Period End2021-05-312021-02-282020-11-302020-08-312020-05-312020-02-292019-11-302019-08-312019-05-312019-02-282018-11-302018-08-312018-05-312018-02-282017-11-302017-08-312017-05-312017-02-282016-11-302016-08-312016-05-312016-02-292015-11-302015-08-312015-05-312015-02-282014-11-302014-08-312014-05-312014-02-282013-11-302012-11-30
Value2.1431.593.5093.1642.161.7823.3433.0052.0751.6973.662.8552.2411.3833.4222.7452.0321.5063.0512.6881.9811.7043.5173.0422.661181918172.5474.353113
Percentage of LiabilitiesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets1.00.71.61.40.90.71.41.20.80.71.41.10.60.40.90.70.50.40.70.60.50.40.80.70.63.73.73.43.10.50.816.6

Operating Lease Liability Current

us-gaap:OperatingLeaseLiabilityCurrent

us-gaap:OperatingLeaseLiabilityCurrent


Operating
Period End2021-05-312021-02-282020-11-302020-08-312020-05-312020-02-292019-11-30
Value221000.0213000.0207000.0201000.0192000.0188000.00
Percentage of OperatingLeaseLiabilityCurrent100.0100.0100.0100.0100.0100.00.0
Percentage of Assets0.10.10.10.10.10.10.0

Other Liabilities Current

us-gaap:OtherLiabilitiesCurrent

us-gaap:OtherLiabilitiesCurrent


Other
Period End2021-05-312021-02-282020-11-302020-08-312020-05-312020-02-292019-11-302019-08-312019-05-312019-02-282018-11-302018-08-312018-05-312018-02-282017-11-302017-08-312017-05-312017-02-282016-11-302016-08-312016-05-312016-02-292015-11-302015-08-312015-05-312015-02-282014-11-302014-08-312014-05-312014-02-282013-11-302012-11-30
Value187000.0187000.0182000.0182000.0182000.0182000.0182000.0182000.0182000.0182000.0182000.0182000.0182000.0182000.0182000.0217000.0214000.0214000.0214000.0276000.0295000.0396000.0451000.0518000.0548000.0549000.0625000.0747000.0813000.0834000.0861000.01000000.0
Percentage of OtherLiabilitiesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.10.10.10.10.10.10.10.10.10.10.10.10.00.00.00.10.10.10.10.10.10.10.10.10.10.10.10.10.10.20.10.1

Deferred Income Tax Liabilities Net

us-gaap:DeferredIncomeTaxLiabilitiesNet

us-gaap:DeferredIncomeTaxLiabilitiesNet


Deferred
Period End2020-08-312020-05-312020-02-292019-11-30
Value1272000.01097000.0924000.0751000.0
Percentage of DeferredIncomeTaxLiabilitiesNet100.0100.0100.0100.0
Percentage of Assets0.60.50.40.3

Operating Lease Liability Noncurrent

us-gaap:OperatingLeaseLiabilityNoncurrent

us-gaap:OperatingLeaseLiabilityNoncurrent


Operating
Period End2021-05-312021-02-282020-11-302020-08-312020-05-312020-02-292019-11-30
Value310000.0355000.0404000.0455000.0491000.0550000.00
Percentage of OperatingLeaseLiabilityNoncurrent100.0100.0100.0100.0100.0100.00.0
Percentage of Assets0.10.20.20.20.20.20.0

Lessee Operating Lease Liability Payments Due Year Four

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour


Lessee
Period End2020-11-302020-08-31
Value92000.091000.0
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearFour100.0100.0
Percentage of Assets0.00.0

Lessee Operating Lease Liability Payments Due Year Five

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFive

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFive


Lessee
Period End2020-11-30
Value8000.0
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearFive100.0
Percentage of Assets0.0

Operating Lease Liability

us-gaap:OperatingLeaseLiability

us-gaap:OperatingLeaseLiability


Operating
Period End2020-11-302020-08-312020-02-29
Value611000.0656000.0738000.0
Percentage of OperatingLeaseLiability100.0100.0100.0
Percentage of Assets0.30.30.3

Lessee Operating Lease Liability Payments Due

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDue

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDue


Lessee
Period End2020-11-302020-08-31
Value659000.0712000.0
Percentage of LesseeOperatingLeaseLiabilityPaymentsDue100.0100.0
Percentage of Assets0.30.3

Lessee Operating Lease Liability Undiscounted Excess Amount

us-gaap:LesseeOperatingLeaseLiabilityUndiscountedExcessAmount

us-gaap:LesseeOperatingLeaseLiabilityUndiscountedExcessAmount


Lessee
Period End2020-11-302020-08-31
Value48000.056000.0
Percentage of LesseeOperatingLeaseLiabilityUndiscountedExcessAmount100.0100.0
Percentage of Assets0.00.0

Stockholders Equity

us-gaap:StockholdersEquity

us-gaap:StockholdersEquity


Stockholders
Period End2021-05-312021-02-282020-11-302020-08-312020-05-312020-02-292019-11-302019-08-312019-05-312019-02-282018-11-302018-08-312018-05-312018-02-282017-11-302017-08-312017-05-312017-02-282016-11-302016-08-312016-05-312016-02-292015-11-302015-08-312015-05-312015-02-282014-11-302014-08-312014-05-312014-02-282013-11-302012-11-30
Value98104110115124131137144149155160165268279284300286297300313318315329339361368405430441442465476
Percentage of StockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets46.048.149.350.552.954.656.157.759.360.861.662.969.771.071.272.772.373.473.574.575.275.475.976.777.875.977.278.879.579.880.569.6

us-gaap:StockholdersEquity us-gaap:StatementEquityComponents

us-gaap:AccumulatedOtherComprehensiveIncome


Stockholders
Period End2021-05-312021-02-282020-11-302020-08-312020-05-312020-02-292019-11-302019-08-312019-05-312019-02-282018-11-302018-08-312018-05-312018-02-282017-11-302017-08-312017-05-312017-02-282016-11-302015-11-302014-11-302013-11-30
Value-21.404-23.098-23.876-24.077-26.422-25.263-24.808-24.834-25.734-24.337-24.478-24.021-7.771-4.401-6.1752.266-20.284-15.321-18.86-17.6853464
Percentage of StockholdersEquity-21.8-22.0-21.6-20.8-21.3-19.3-18.0-17.2-17.2-15.7-15.2-14.5-2.9-1.6-2.20.8-7.1-5.2-6.3-5.48.613.9
Percentage of Assets-10.0-10.6-10.6-10.5-11.2-10.5-10.1-9.9-10.2-9.5-9.4-9.1-2.0-1.1-1.50.5-5.1-3.8-4.6-4.16.611.1
Percentage of Assets us-gaap:AccumulatedOtherComprehensiveIncome0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AdditionalPaidInCapital


Stockholders
Period End2021-05-312021-02-282020-11-302020-08-312020-05-312020-02-292019-11-302019-08-312019-05-312019-02-282018-11-302018-08-312018-05-312018-02-282017-11-302017-08-312017-05-312017-02-282016-11-302015-11-302014-11-302013-11-30
Value81808181797982818382878786848384838182807466
Percentage of StockholdersEquity83.376.673.370.163.860.859.656.855.953.354.852.932.230.229.428.329.227.527.524.518.314.3
Percentage of Assets38.336.836.235.433.833.233.532.833.232.433.733.322.421.520.920.521.120.120.218.614.111.5
Percentage of Assets us-gaap:AdditionalPaidInCapital0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:CommonStock


Stockholders
Period End2021-05-312021-02-282020-11-302020-08-312020-05-312020-02-292019-11-302019-08-312019-05-312019-02-282018-11-302018-08-312018-05-312018-02-282017-11-302017-08-312017-05-312017-02-282016-11-302015-11-302014-11-302013-11-30
Value1974197419721970197019681965196419601960195419531952195219511948194719471942193819361933
Percentage of StockholdersEquity2012.61882.81781.01702.51584.71502.31424.81361.81308.61263.01216.61180.1727.3698.5687.1648.7680.9654.7646.9588.6478.0415.3
Percentage of Assets925.9905.5878.6860.4838.3820.7799.5786.1776.6767.4749.2742.2507.0495.6489.3471.3492.5480.4475.8447.0369.1334.2
Percentage of Assets us-gaap:CommonStock0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:RetainedEarnings


Stockholders
Period End2021-05-312021-02-282020-11-302020-08-312020-05-312020-02-292019-11-302019-08-312019-05-312019-02-282018-11-302018-08-312018-05-312018-02-282017-11-302017-08-312017-05-312017-02-282016-11-302015-11-302014-11-302013-11-30
Value-1937.106-1926.585-1918.629-1911.629-1898.893-1891.66-1885.065-1877.198-1869.142-1863.627-1857.682-1851.388-1762.763-1753.132-1744.917-1734.899-1724.506-1716.044-1705.901-1672.055-1640.103-1599.619
Percentage of StockholdersEquity-1974.1-1837.3-1732.8-1651.8-1527.2-1443.9-1366.4-1301.4-1247.4-1200.7-1156.1-1118.5-656.6-627.2-614.3-577.7-603.0-577.0-568.1-507.8-404.8-343.5
Percentage of Assets-908.2-883.6-854.8-834.8-807.9-788.8-766.8-751.2-740.3-729.5-711.9-703.5-457.7-445.0-437.5-419.7-436.1-423.4-417.8-385.6-312.7-276.4
Percentage of Assets us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Common Stock Value

us-gaap:CommonStockValue

us-gaap:CommonStockValue


Common
Period End2021-05-312021-02-282020-11-302020-08-312020-05-312020-02-292019-11-302019-08-312019-05-312019-02-282018-11-302018-08-312018-05-312018-02-282017-11-302017-08-312017-05-312017-02-282016-11-302016-08-312016-05-312016-02-292015-11-302015-08-312015-05-312015-02-282014-11-302014-08-312014-05-312014-02-282013-11-302012-11-30
Value19741974197219701970196819651964196019601954195319521952195119481947194719421942194219411938193819381938193619361936193619331462
Percentage of CommonStockValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets925.9905.5878.6860.4838.3820.7799.5786.1776.6767.4749.2742.2507.0495.6489.3471.3492.5480.4475.8462.1457.9463.3447.0438.0416.9399.0369.1354.5348.7349.4334.2213.4

Additional Paid In Capital

us-gaap:AdditionalPaidInCapital

us-gaap:AdditionalPaidInCapital


Additional
Period End2021-05-312021-02-282020-11-302020-08-312020-05-312020-02-292019-11-302019-08-312019-05-312019-02-282018-11-302018-08-312018-05-312018-02-282017-11-302017-08-312017-05-312017-02-282016-11-302016-08-312016-05-312016-02-292015-11-302015-08-312015-05-312015-02-282014-11-302014-08-312014-05-312014-02-282013-11-302012-11-30
Value81808181797982818382878786848384838182807977807977767472706866454
Percentage of AdditionalPaidInCapital100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets38.336.836.235.433.833.233.532.833.232.433.733.322.421.520.920.521.120.120.219.218.718.618.617.916.715.814.113.212.712.311.566.3

Retained Earnings Accumulated Deficit

us-gaap:RetainedEarningsAccumulatedDeficit

us-gaap:RetainedEarningsAccumulatedDeficit


Retained
Period End2021-05-312021-02-282020-11-302020-08-312020-05-312020-02-292019-11-302019-08-312019-05-312019-02-282018-11-302018-08-312018-05-312018-02-282017-11-302017-08-312017-05-312017-02-282016-11-302016-08-312016-05-312016-02-292015-11-302015-08-312014-11-30
Value-1937100000.0-1926600000.0-1918600000.0-1911600000.0-1898900000.0-1891700000.0-1885100000.0-1877200000.0-1869100000.0-1863600000.0-1857700000.0-1851400000.0-1762800000.0-1753100000.0-1744900000.0-1734900000.0-1724500000.0-1716000000.0-1705900000.0-1698600000.0-1691200000.0-1682000000.0-1672100000.0-1664900000.0-1640100000.0
Percentage of RetainedEarningsAccumulatedDeficit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets-908.2-883.6-854.8-834.8-807.9-788.8-766.8-751.2-740.3-729.5-711.9-703.5-457.7-445.0-437.5-419.7-436.1-423.4-417.8-404.0-398.7-401.4-385.6-376.3-312.7

Accumulated Other Comprehensive Income Loss Net Of Tax

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax


Accumulated
Period End2021-05-312021-02-282020-11-302020-08-312020-05-312020-02-292019-11-302019-08-312019-05-312019-02-282018-11-302018-08-312018-05-312018-02-282017-11-302017-08-312017-05-312017-02-282016-11-302016-08-312016-05-312016-02-292015-11-302015-08-312015-05-312015-02-282014-11-302014-08-312014-05-312014-02-282013-11-302012-11-30
Value-21.404-23.098-23.876-24.077-26.422-25.263-24.808-24.834-25.734-24.337-24.478-24.021-7.771-4.401-6.1752.266-20.284-15.321-18.86-11.496-11.411-21.671-17.685-13.2414.8033.023345455476497
Percentage of AccumulatedOtherComprehensiveIncomeLossNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets-10.0-10.6-10.6-10.5-11.2-10.5-10.1-9.9-10.2-9.5-9.4-9.1-2.0-1.1-1.50.5-5.1-3.8-4.6-2.7-2.7-5.2-4.1-3.01.00.66.610.010.18.611.114.2

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

us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue

us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue


Adjustments
Period End2021-05-312021-02-282020-08-312020-05-312020-02-292019-08-312019-05-312019-02-282018-08-312018-05-312018-02-282017-08-312017-05-312017-02-28
Value2.0952.0421.7831.7151.7611.5521.5421.5311.921.9421.9492.1412.0493.925
Percentage of AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital


Adjustments
Period End2021-05-312021-02-282020-08-312020-05-312020-02-292019-08-312019-05-312019-02-282018-08-312018-05-312018-02-282017-08-312017-05-312017-02-28
Value2.0952.0421.7831.7151.7611.5521.5421.5311.921.9421.9492.1412.0493.925
Percentage of AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.0
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 End2021-05-312021-02-282020-11-302020-08-312020-05-312020-02-292019-11-302019-08-312019-05-312019-02-282018-11-302018-08-312018-05-312018-02-282017-11-302017-08-312017-05-312017-02-28
Value-1976000.0-4286000.0-2863000.0-1826000.0-1834000.0-3497000.0-843000.0-373000.0-1761000.0-3150000.0-2438000.0-1462000.0-1850000.0-4642000.0-844000.0-1679000.0-1537000.0-4221000.0
Percentage of NetCashProvidedByUsedInOperatingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Net Cash Provided By Used In Investing Activities

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:NetCashProvidedByUsedInInvestingActivities


Net
Period End2021-05-312021-02-282020-11-302020-08-312020-05-312020-02-292019-11-302019-08-312019-05-312019-02-282018-11-302018-08-312018-05-312018-02-282017-11-302017-08-312017-05-312017-02-28
Value-9.9777.05418-6.693-4.29-2.61436-2.9096.1039.539-3.053-0.568-2.397.2241.4614.987-7.668
Percentage of NetCashProvidedByUsedInInvestingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Net Cash Provided By Used In Financing Activities

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:NetCashProvidedByUsedInFinancingActivities


Net
Period End2021-05-312021-02-282020-11-302020-08-312020-05-312020-02-292019-11-302019-08-312019-05-312019-02-282018-11-302018-08-312017-05-312017-02-28
Value0-731000.0000-1652000.0000-1197000.0000-196000.0
Percentage of NetCashProvidedByUsedInFinancingActivities0.0100.00.00.00.0100.00.00.00.0100.00.00.00.0100.0
Percentage of Revenues0.00.00.00.00.00.00.00.00.00.00.00.00.00.0

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

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect


Cash
Period End2021-05-312021-02-282020-11-302020-08-312020-05-312020-02-292019-11-302019-08-312019-05-312019-02-282018-11-302018-08-312018-05-312018-02-28
Value-11.4052.28715-7.981-6.37-7.851335-4.7911.7737.048-4.521-2.454-7.023
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues0.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Deferred Income Tax Expense Benefit

us-gaap:DeferredIncomeTaxExpenseBenefit

us-gaap:DeferredIncomeTaxExpenseBenefit


Deferred
Period End2020-11-302020-08-312020-05-312020-02-292019-11-302019-08-312019-05-312019-02-282018-11-302018-08-312018-05-312018-02-282016-11-302016-08-312016-05-312016-02-292015-11-302015-08-312015-05-312015-02-282014-11-302014-08-312014-05-312014-02-282013-11-302013-08-31
Value-1.2720.1750.1730.1730.1680.1690.1670.1670.121-0.0060.0240.0110.023-0.006-0.083-0.003-0.0160.01-0.0060.010.0790.0010.044-0.053.6060.0
Percentage of DeferredIncomeTaxExpenseBenefit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0

Net Cash Provided By Used In Operating Activities

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetCashProvidedByUsedInOperatingActivities


Net
Period End2021-05-312021-02-282020-11-302020-08-312020-05-312020-02-292019-11-302019-08-312019-05-312019-02-282018-11-302018-08-312018-05-312018-02-282017-11-302017-08-312017-05-312017-02-28
Value-1976000.0-4286000.0-2863000.0-1826000.0-1834000.0-3497000.0-843000.0-373000.0-1761000.0-3150000.0-2438000.0-1462000.0-1850000.0-4642000.0-844000.0-1679000.0-1537000.0-4221000.0
Percentage of NetCashProvidedByUsedInOperatingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Net Income Loss

us-gaap:NetIncomeLoss

us-gaap:NetIncomeLoss


Net
Period End2021-05-312021-02-282020-11-302020-08-312020-05-312020-02-292019-11-302019-08-312019-05-312019-02-282018-11-302018-08-312018-05-312018-02-282017-11-302017-08-312017-05-312017-02-282016-11-302016-08-312016-05-312016-02-292015-11-302015-08-312015-05-312015-02-282014-11-302014-08-312014-05-312014-02-282013-11-302013-08-312013-05-312013-02-282012-11-302012-08-312012-05-312012-02-29
Value-10.521-7.956-7.0-12.736-7.233-6.595-7.867-8.056-5.515-6.323-6.294-88.625-9.631-8.215-10.018-10.393-8.462-10.143-7.35-7.381-9.138-9.977-7.168-6.301-9.184-9.299-7.098-12.009-10.681-10.691-19.189-19.962-9.833-13.776-30.224-12.3961515
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 Revenues0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:NetIncomeLoss us-gaap:StatementEquityComponents

us-gaap:RetainedEarnings


Net
Period End2021-05-312021-02-282020-08-312020-05-312020-02-292019-08-312019-05-312019-02-282018-08-312018-05-312018-02-282017-11-302017-08-312017-05-312017-02-28
Value-10.521-7.956-12.736-7.233-6.595-8.056-5.515-6.323-88.625-9.631-8.215-10.018-10.393-8.462-10.143
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Revenues us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Share Based Compensation

us-gaap:ShareBasedCompensation

us-gaap:ShareBasedCompensation


Share
Period End2021-05-312021-02-282020-11-302020-08-312020-05-312020-02-292019-11-302019-08-312019-05-312019-02-282018-11-302018-08-312018-05-312018-02-282017-11-302017-08-312017-05-312017-02-282016-11-302016-08-312016-05-312016-02-292015-11-302015-08-312015-05-312015-02-282014-11-302014-08-312014-05-312014-02-282013-11-302013-08-312013-05-312013-02-28
Value2.0952.0421.7981.7831.7151.7611.5511.5521.5421.5311.9161.921.9421.9492.1782.1412.0493.9251.8171.8691.8694.7081.7581.6730.7285.3291.7461.8861.9074.6583.5311.7911.445.542
Percentage of ShareBasedCompensation100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Net Cash Provided By Used In Investing Activities

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:NetCashProvidedByUsedInInvestingActivities


Net
Period End2021-05-312021-02-282020-11-302020-08-312020-05-312020-02-292019-11-302019-08-312019-05-312019-02-282018-11-302018-08-312018-05-312018-02-282017-11-302017-08-312017-05-312017-02-28
Value-9.9777.05418-6.693-4.29-2.61436-2.9096.1039.539-3.053-0.568-2.397.2241.4614.987-7.668
Percentage of NetCashProvidedByUsedInInvestingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Payments To Acquire Investments

us-gaap:PaymentsToAcquireInvestments

us-gaap:PaymentsToAcquireInvestments


Payments
Period End2021-05-312021-02-282020-11-302020-08-312020-05-312020-02-292019-11-302019-08-312019-05-312019-02-282018-11-302018-08-312018-05-312018-02-282017-11-302017-08-312017-05-312017-02-282016-11-302016-08-312016-05-312016-02-29
Value3025150.0113535-0.0111080.01201715410.046455.05.04535
Percentage of PaymentsToAcquireInvestments100.0100.0100.00.0100.0100.0100.00.0100.0100.00.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0

Net Cash Provided By Used In Financing Activities

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:NetCashProvidedByUsedInFinancingActivities


Net
Period End2021-05-312021-02-282020-11-302020-08-312020-05-312020-02-292019-11-302019-08-312019-05-312019-02-282018-11-302018-08-312017-05-312017-02-28
Value0-731000.0000-1652000.0000-1197000.0000-196000.0
Percentage of NetCashProvidedByUsedInFinancingActivities0.0100.00.00.00.0100.00.00.00.0100.00.00.00.0100.0
Percentage of Revenues0.00.00.00.00.00.00.00.00.00.00.00.00.00.0

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

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber


Share
Period End2021-05-312021-02-282020-11-302020-08-312020-05-312020-02-292019-11-302019-08-312019-05-312019-02-282018-11-302018-08-312018-05-312018-02-282017-11-302017-08-312017-05-312016-11-302015-11-30
Value101110111113121316171719190.0200931720211917
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod us-gaap:AwardType

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod

ng:PerformanceShareUnits


Share
Period End2021-05-312021-02-282020-11-302017-02-282016-02-29
Value0331000.00940500.01241900.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod0.0100.00.0100.0100.0

Deferred Tax Assets Net

us-gaap:DeferredTaxAssetsNet

us-gaap:DeferredTaxAssetsNet


Deferred
Period End2020-11-302019-11-302018-11-302017-11-302016-11-302015-11-302014-11-302013-11-302012-11-30
Value2.0930.2710.613403838445455
Percentage of DeferredTaxAssetsNet100.0100.0100.0100.0100.0100.0100.0100.0100.0

Deferred Tax Assets Valuation Allowance

us-gaap:DeferredTaxAssetsValuationAllowance

us-gaap:DeferredTaxAssetsValuationAllowance


Deferred
Period End2020-11-302019-11-302018-11-302017-11-302016-11-302015-11-302014-11-302013-11-302012-11-30
Value271260254297282276-281.071-276.63-260.492
Percentage of DeferredTaxAssetsValuationAllowance100.0100.0100.0100.0100.0100.0100.0100.0100.0

ng:CorporateCommunicationsAndRegulatoryExpense

ng:CorporateCommunicationsAndRegulatoryExpense


Corporate
Period End2021-05-312021-02-282020-11-302020-08-312020-05-312020-02-292019-11-302019-08-312019-05-312019-02-282018-11-302018-08-312018-05-312018-02-282017-11-302017-08-312017-05-312017-02-282016-11-302016-08-312016-05-312016-02-29
Value338000.0309000.095000.0347000.0322000.0402000.0204000.0238000.0261000.0240000.043000.040000.0549000.0286000.099000.0170000.0494000.0229000.0228000.0104000.0375000.0294000.0
Percentage of CorporateCommunicationsAndRegulatoryExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

ng:EquityMethodInvestmentSummarizedFinancialInformationDepreciation us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

ng:EquityMethodInvestmentSummarizedFinancialInformationDepreciation

ng:DonlinGold


Equity
Period End2021-05-312021-02-282020-11-302020-08-312020-05-312020-02-292019-11-302019-08-312019-05-312019-02-282018-11-302018-08-312018-05-312018-02-282017-11-302017-08-312017-05-312017-02-282016-11-302016-08-312016-05-312016-02-29
Value69000.067000.064000.039000.035000.025000.024000.016000.04000.013000.02000.01000.04000.06000.015000.020000.022000.023000.022000.033000.036000.039000.0
Percentage of EquityMethodInvestmentSummarizedFinancialInformationDepreciation100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

ng:EquityMethodInvestmentSummarizedFinancialInformationMineralPropertyExpenditures us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

ng:EquityMethodInvestmentSummarizedFinancialInformationMineralPropertyExpenditures

ng:DonlinGold


Equity
Period End2021-05-312021-02-282020-11-302020-08-312020-05-312020-02-292019-11-302019-08-312019-05-312019-02-282018-11-302018-08-312018-05-312018-02-282017-11-302017-08-312017-05-312017-02-282016-11-302016-08-312016-05-312016-02-29
Value4.1291.9013.026.1113.6651.5433.8053.1252.1941.311.5362.5132.9011.8353.413.1452.5252.0592.3121.9472.4661.964
Percentage of EquityMethodInvestmentSummarizedFinancialInformationMineralPropertyExpenditures100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

ng:NotesReceivableAccretion

ng:NotesReceivableAccretion


Notes
Period End2021-05-312021-02-282020-11-302020-08-312020-05-312020-02-292019-11-302019-08-312019-05-312019-02-282018-11-302018-08-31
Value854000.0854000.0854000.0835000.0824000.0824000.0824000.0805000.0796000.0795000.0796000.0265000.0
Percentage of NotesReceivableAccretion100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

ng:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsPerformanceMultiplierOnAwardsVested us-gaap:AwardType

ng:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsPerformanceMultiplierOnAwardsVested

ng:PerformanceShareUnits


Share
Period End2021-05-312021-02-282020-11-302020-08-312020-05-312020-02-292019-11-302019-08-312019-05-312019-02-282017-11-302017-08-312017-05-312017-02-282016-11-302016-08-31
Value0150.00148.501.50000.820001.1300
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsPerformanceMultiplierOnAwardsVested0.0100.00.0100.00.0100.00.00.00.0100.00.00.00.0100.00.00.0

ng:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedForfeitureRate

ng:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedForfeitureRate


Share
Period End2021-05-312021-02-282020-11-302020-08-312020-05-312020-02-292019-11-302019-08-312019-05-312019-02-282018-11-302018-08-312018-05-312018-02-282017-11-302017-08-312017-05-312017-02-282016-11-302016-08-312016-05-312016-02-29
Value03.003.06900.0310000.0310000.0230000.0250000.03
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedForfeitureRate0.0100.00.0100.00.0100.00.00.00.0100.00.00.00.0100.00.00.00.0100.00.00.00.0100.0

ng:SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsPerformanceAdjustment us-gaap:AwardType

ng:SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsPerformanceAdjustment

ng:PerformanceShareUnits


Sharebased
Period End2021-05-312021-02-282020-11-30
Value0-216000.00
Percentage of SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsPerformanceAdjustment0.0100.00.0

ng:SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodMultiplier us-gaap:AwardType, us-gaap:SubsequentEventType

ng:SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodMultiplier

ng:PerformanceShareUnits, us-gaap:SubsequentEvent


Sharebased
Period End2020-12-01
Value150.0
Percentage of SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodMultiplier100.0

us-gaap:AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation

us-gaap:AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation


Adjustments
Period End2021-02-282020-02-292019-02-282017-02-282016-11-302016-08-312016-05-312016-02-292015-11-302015-08-312015-05-312015-02-282014-11-302014-08-312014-05-312014-02-282013-11-302013-08-312013-05-312013-02-28
Value731000.01652000.01197000.0196000.0000-4275000.0000-827000.0000-636000.000-34000.0-585000.0
Percentage of AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation100.0100.0100.0100.00.00.00.0100.00.00.00.0100.00.00.00.0100.00.00.0100.0100.0

us-gaap:AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital


Adjustments
Period End2021-02-282020-02-292019-02-282017-02-28
Value731000.01652000.01197000.0196000.0
Percentage of AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation100.0100.0100.0100.0

us-gaap:DebtInstrumentBasisSpreadOnVariableRate1 us-gaap:LineOfCreditFacility, us-gaap:LongtermDebtType, us-gaap:VariableRate

us-gaap:DebtInstrumentBasisSpreadOnVariableRate1

ng:Barrick, us-gaap:NotesPayableOtherPayables, us-gaap:PrimeRate


Debt
Period End2021-02-28
Value2.0
Percentage of DebtInstrumentBasisSpreadOnVariableRate1100.0

us-gaap:Depreciation

us-gaap:Depreciation


Depreciation
Period End2021-05-312021-02-282020-11-302020-08-312020-05-312020-02-292019-11-302019-08-312019-05-312019-02-282018-11-302018-08-312018-05-312018-02-282017-11-302017-08-312017-05-312017-02-282016-11-302016-08-312016-05-312016-02-292015-11-302015-08-312015-05-312015-02-282014-11-302014-08-312014-05-312014-02-282013-11-302013-08-312013-05-312013-02-28
Value2000.02000.01000.02000.02000.02000.04000.04000.03000.04000.06000.05000.05000.06000.05000.010000.09000.010000.08000.08000.08000.09000.09000.08000.09000.09000.09000.09000.08000.010000.08000.010000.09000.010000.0
Percentage of Depreciation100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:EffectOfExchangeRateOnCashAndCashEquivalents

us-gaap:EffectOfExchangeRateOnCashAndCashEquivalents


Effect
Period End2020-08-312020-05-312020-02-292019-11-302019-08-312019-05-312019-02-282018-11-302018-08-312018-05-312018-02-28
Value538000.0-246000.0-101000.04000.0108000.0-121000.017000.0-53000.0-6000.0-36000.09000.0
Percentage of EffectOfExchangeRateOnCashAndCashEquivalents100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations

us-gaap:EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations


Effect
Period End2021-05-312021-02-282020-05-312020-02-29
Value548000.0250000.0-246000.0-101000.0
Percentage of EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations100.0100.0100.0100.0

us-gaap:EquitySecuritiesFvNiGainLoss

us-gaap:EquitySecuritiesFvNiGainLoss


Equity
Period End2021-05-312021-02-282020-11-302020-08-312020-05-312020-02-292019-11-302019-08-312019-05-312019-02-282018-11-302018-08-31
Value258000.0226000.0-231000.0372000.0298000.0-8000.0-155000.0190000.014000.044000.000
Percentage of EquitySecuritiesFvNiGainLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.0

us-gaap:ForeignCurrencyTransactionGainLossBeforeTax

us-gaap:ForeignCurrencyTransactionGainLossBeforeTax


Foreign
Period End2021-05-312021-02-282020-11-302020-08-312020-05-312020-02-292019-11-302019-08-312019-05-312019-02-282018-11-302018-08-312018-05-312018-02-282017-11-302017-08-312017-05-312017-02-282016-11-302016-08-312016-05-312016-02-292015-11-302015-08-312015-05-312015-02-282014-11-302014-08-312014-05-312014-02-282013-11-302013-08-312013-05-312013-02-28
Value-1.043-0.483-0.121-1.7450.8820.378-0.021-0.7821.209-0.3860.152-0.205-0.002-0.1160.287-0.8510.194-0.1610.450.004-0.7970.5250.4151.141-0.2473.4622.1670.173-1.1012.4491.6070.0290.9747.838
Percentage of ForeignCurrencyTransactionGainLossBeforeTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ForeignCurrencyTransactionGainLossRealized

us-gaap:ForeignCurrencyTransactionGainLossRealized


Foreign
Period End2021-05-312021-02-282020-11-302020-08-312020-05-312020-02-292019-11-302019-08-312019-05-312019-02-282018-11-302018-08-312018-05-312018-02-282017-11-302017-08-312017-05-312017-02-282016-11-302016-08-312016-05-312016-02-292015-11-302015-08-312015-05-312015-02-282014-11-302014-08-312014-05-312014-02-282013-11-302013-08-312013-05-312013-02-28
Value-1.043-0.483-0.121-1.7450.8820.378-0.021-0.7821.209-0.3860.152-0.205-0.002-0.1160.287-0.8510.194-0.1610.450.004-0.7970.5250.4151.141-0.2473.4622.1670.173-1.1012.4491.6070.0290.9747.838
Percentage of ForeignCurrencyTransactionGainLossRealized100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncomeLossFromEquityMethodInvestments

us-gaap:IncomeLossFromEquityMethodInvestments


Income
Period End2021-05-312021-02-282020-11-302020-08-312020-05-312020-02-292019-11-302019-08-312019-05-312019-02-282018-11-302018-08-312018-05-312018-02-282017-11-302017-08-312017-05-312017-02-282016-11-302016-08-312016-05-312016-02-292015-11-302015-08-312015-05-312015-02-282014-11-302014-08-312014-05-312014-02-282013-08-312013-05-312013-02-28
Value-4.198-1.968-3.084-6.15-3.7-1.568-3.829-3.141-2.198-1.323-1.538-2.514-3.299-2.094-4.114-3.777-2.772-2.232-2.757-2.192-2.822-2.197-2.39-2.457-3.939-2.622-2.98-5.709-3.6163.621-10.106-6.2385.483
Percentage of IncomeLossFromEquityMethodInvestments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncomeLossFromEquityMethodInvestments us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

ng:DonlinGold


Income
Period End2021-05-312021-02-282020-11-302020-08-312020-05-312020-02-292019-11-302019-08-312019-05-312019-02-282018-11-302018-08-312018-05-312018-02-282017-11-302017-08-312017-05-312017-02-282016-11-302016-08-312016-05-312016-02-29
Value-4.198-1.968-3.084-6.15-3.7-1.568-3.829-3.141-2.198-1.323-1.538-2.514-2.905-1.841-2.317-3.165-2.547-2.082-2.334-1.98-2.502-2.003
Percentage of IncomeLossFromEquityMethodInvestments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.088.187.956.383.891.993.384.790.388.791.2

us-gaap:IncreaseDecreaseInAccountsPayableAndAccruedLiabilities

us-gaap:IncreaseDecreaseInAccountsPayableAndAccruedLiabilities


Increase
Period End2021-05-312021-02-282020-11-302020-08-312020-05-312020-02-292019-11-302019-08-312019-05-312019-02-282018-11-302018-08-312018-05-312018-02-282017-11-302017-08-312017-05-312017-02-282016-11-302016-08-312016-05-312016-02-292015-11-302015-08-312015-05-312015-02-282014-11-302014-08-312014-05-312014-02-282013-11-302013-08-312013-05-312013-02-28
Value-0.037-0.355-0.2070.395-0.037-0.2880.357-0.029-0.203-0.0410.238-0.0330.222-0.1940.4050.6640.537-1.5540.440.7210.365-1.7511.0410.497-0.154-1.6590.4471.044-0.113-1.3221.4980.022-0.587-2.164
Percentage of IncreaseDecreaseInAccountsPayableAndAccruedLiabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInEmployeeRelatedLiabilities

us-gaap:IncreaseDecreaseInEmployeeRelatedLiabilities


Increase
Period End2021-05-312021-02-282020-11-302020-08-312020-05-312020-02-292019-11-302019-08-312019-05-312019-02-282018-11-302018-08-312018-05-312018-02-282017-11-302017-08-312017-05-312017-02-28
Value542000.0-1592000.0537000.0551000.0437000.0-1458000.0-20000.0947000.0601000.0-1929000.0589000.0656000.0647000.0-1854000.0592000.0635000.0630000.0-1537000.0
Percentage of IncreaseDecreaseInEmployeeRelatedLiabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInOperatingCapital

us-gaap:IncreaseDecreaseInOperatingCapital


Increase
Period End2021-05-312021-02-282020-11-302020-08-312020-05-312020-02-292019-11-302019-08-312019-05-312019-02-282016-08-312016-05-312016-02-292015-11-302015-08-312015-05-312015-02-282014-11-302014-08-312014-05-312014-02-282013-11-302013-08-312013-05-312013-02-28
Value-839000.01179000.0402000.0-832000.0-409000.0974000.0-380000.0-1143000.0-2000.01197000.0-1618000.0-570000.01172000.0-1323000.0-521000.0-18000.01403000.0-579000.0-1525000.0-2436000.01367000.0441000.0-1210000.0338000.02019000.0
Percentage of IncreaseDecreaseInOperatingCapital100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInOtherOperatingAssets

us-gaap:IncreaseDecreaseInOtherOperatingAssets


Increase
Period End2021-05-312021-02-282020-11-302020-08-312020-05-312020-02-292019-11-302019-08-312019-05-312019-02-282018-11-302018-08-312018-05-312018-02-282017-11-302017-08-312017-05-312017-02-282016-11-302016-08-312016-05-312016-02-29
Value-334000.0-768000.0732000.0114000.0-9000.0-772000.0-43000.0-225000.0396000.0-773000.01768000.0-235000.0-73000.011000.0-752000.0154000.0-492000.027000.0-403000.0-915000.0-306000.0-634000.0
Percentage of IncreaseDecreaseInOtherOperatingAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InvestmentIncomeInterest

us-gaap:InvestmentIncomeInterest


Investment
Period End2021-05-312021-02-282020-11-302020-08-312020-05-312020-02-292019-11-302019-08-312019-05-312019-02-282018-11-302018-08-312018-05-312018-02-282017-11-302017-08-312017-05-312017-02-282016-11-302016-08-312016-05-312016-02-292015-11-302015-08-312015-05-312015-02-282014-11-302014-08-312014-05-312014-02-282013-11-302013-08-312013-05-312013-02-28
Value0.080.1780.3220.3910.5140.5171.0511.0011.0961.0420.770.750.2380.240.3090.3090.3070.2470.280.2660.220.1810.1830.1920.1870.1780.2050.1830.150.3160.2560.240.2360.21
Percentage of InvestmentIncomeInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:LeaseCost

us-gaap:LeaseCost


Lease
Period End2020-11-30
Value98000.0
Percentage of LeaseCost100.0

us-gaap:OperatingLeaseCost

us-gaap:OperatingLeaseCost


Operating
Period End2020-11-30
Value59000.0
Percentage of OperatingLeaseCost100.0

us-gaap:OperatingLeasePayments

us-gaap:OperatingLeasePayments


Operating
Period End2020-11-30
Value55000.0
Percentage of OperatingLeasePayments100.0

us-gaap:OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax

us-gaap:OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax


Other
Period End2021-05-312021-02-282020-11-302020-08-312020-05-312020-02-292019-11-302019-08-312019-05-312019-02-282018-11-302018-08-312018-05-312018-02-282017-11-302017-08-31
Value1.6940.7780.2012.345-1.159-0.4550.0260.9-1.3970.519-0.277-2.448-3.2051.868-8.52922
Percentage of OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent

us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent


Other
Period End2021-05-312021-02-282020-11-302020-08-312020-05-312020-02-292019-11-302019-08-312019-05-312019-02-282018-11-302018-08-312018-05-312018-02-28
Value1.6940.7780.2012.345-1.159-0.4550.0260.9-1.3970.519-0.457-16.25-3.371.774
Percentage of OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent us-gaap:StatementEquityComponents

us-gaap:AccumulatedOtherComprehensiveIncome


Other
Period End2021-05-312021-02-282020-08-312020-05-312020-02-292019-08-312019-05-312019-02-282018-08-312018-05-31
Value1.6940.7782.345-1.159-0.4550.9-1.3970.519-16.25-3.37
Percentage of OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherGeneralExpense

us-gaap:OtherGeneralExpense


Other
Period End2021-05-312021-02-282020-11-302020-08-312020-05-312020-02-292019-11-302019-08-312019-05-312019-02-282018-11-302018-08-312018-05-312018-02-282017-11-302017-08-312017-05-312017-02-282016-11-302016-08-312016-05-312016-02-292015-11-302015-08-312015-05-312015-02-282014-11-302014-08-312014-05-312014-02-282013-11-302013-08-312013-05-312013-02-28
Value614000.0589000.0555000.0461000.0563000.0620000.0563000.0526000.0551000.0671000.0559000.0671000.0550000.0566000.0566000.0510000.0519000.0545000.0523000.0457000.0551000.0504000.0519000.0503000.0575000.0493000.0709000.0749000.0506000.0662000.0845000.01096000.01557000.0964000.0
Percentage of OtherGeneralExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherOperatingActivitiesCashFlowStatement

us-gaap:OtherOperatingActivitiesCashFlowStatement


Other
Period End2021-05-312021-02-282020-11-302020-08-312020-05-312020-02-292019-11-302019-08-312019-05-312019-02-28
Value2000.02000.05000.04000.06000.012000.0-89000.04000.03000.0-40000.0
Percentage of OtherOperatingActivitiesCashFlowStatement100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PaymentsRelatedToTaxWithholdingForShareBasedCompensation

us-gaap:PaymentsRelatedToTaxWithholdingForShareBasedCompensation


Payments
Period End2021-05-312021-02-282020-11-302020-08-312020-05-312020-02-292019-11-302019-08-312019-05-312019-02-282018-11-302018-08-312017-11-302017-08-312017-05-312017-02-28
Value0731000.00001652000.00001197000.000000196000.0
Percentage of PaymentsRelatedToTaxWithholdingForShareBasedCompensation0.0100.00.00.00.0100.00.00.00.0100.00.00.00.00.00.0100.0

us-gaap:PaymentsRelatedToTaxWithholdingForShareBasedCompensation us-gaap:AwardType

ng:PerformanceShareUnits


Payments
Period End2021-05-312021-02-282020-11-302020-08-312020-05-312020-02-292019-11-302019-08-312019-05-312019-02-282018-11-302017-11-302017-08-312017-05-312017-02-282015-12-01
Value0731000.00001652000.00001197000.00000196000.04275000.0
Percentage of PaymentsRelatedToTaxWithholdingForShareBasedCompensation0.0100.00.00.00.0100.00.00.00.0100.00.00.00.00.0100.00.0

us-gaap:PaymentsToAcquireEquityMethodInvestments us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

us-gaap:PaymentsToAcquireEquityMethodInvestments

ng:DonlinGold


Payments
Period End2021-05-312021-02-282020-11-302020-08-312020-05-312020-02-292019-11-302019-08-312019-05-312019-02-282018-11-302018-08-312018-05-312018-02-282017-11-302017-08-312017-05-312017-02-282016-11-302016-08-312016-05-312016-02-29
Value5.1782.9461.6936.6934.292.63.4763.842.9090.8971.1052.3323.7361.7343.3283.0622.5682.411.5242.4542.8861.848
Percentage of PaymentsToAcquireEquityMethodInvestments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PaymentsToAcquireInterestInSubsidiariesAndAffiliates

us-gaap:PaymentsToAcquireInterestInSubsidiariesAndAffiliates


Payments
Period End2021-05-312021-02-282020-11-302020-08-312020-05-312020-02-292019-11-302019-08-312019-05-312019-02-282018-11-302018-08-312018-05-312018-02-282017-11-302017-08-312017-05-312017-02-282016-11-302016-08-312016-05-312016-02-29
Value5.1782.9461.6936.6934.292.63.4763.842.9090.8971.1052.3324.5682.3773.6763.5393.1132.641.7972.7423.132.063
Percentage of PaymentsToAcquireInterestInSubsidiariesAndAffiliates100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProceedsFromSaleMaturityAndCollectionsOfInvestments

us-gaap:ProceedsFromSaleMaturityAndCollectionsOfInvestments


Proceeds
Period End2021-05-312021-02-282020-11-302020-08-312020-05-312020-02-292019-11-302019-08-312019-05-312019-02-282018-11-302018-08-312018-05-312018-02-282017-11-302017-08-312017-05-312017-02-282016-11-302016-08-312016-05-312016-02-29
Value2635350.011355340111156.0202115515.0554010.05.04540
Percentage of ProceedsFromSaleMaturityAndCollectionsOfInvestments100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProfessionalFees

us-gaap:ProfessionalFees


Professional
Period End2021-05-312021-02-282020-11-302020-08-312020-05-312020-02-292019-11-302019-08-312019-05-312019-02-282018-11-302018-08-312018-05-312018-02-282017-11-302017-08-312017-05-312017-02-282016-11-302016-08-312016-05-312016-02-292015-11-302015-08-312015-05-312015-02-282014-11-302014-08-312014-05-312014-02-282013-11-302013-08-312013-05-312013-02-28
Value388000.0619000.0888000.0669000.0180000.0295000.0189000.0193000.0360000.0230000.0372000.0162000.0216000.0199000.0200000.0211000.0159000.0303000.0156000.0256000.0142000.0126000.0139000.0176000.0136000.0242000.0519000.0505000.0388000.0394000.0437000.0524000.01099000.0829000.0
Percentage of ProfessionalFees100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability

us-gaap:RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability


Right
Period End2020-11-302020-08-312020-05-312020-02-012020-02-29
Value000380000.0380000.0
Percentage of RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability0.00.00.0100.0100.0

us-gaap:SalariesAndWages

us-gaap:SalariesAndWages


Salaries
Period End2021-05-312021-02-282020-11-302020-08-312020-05-312020-02-292019-11-302019-08-312019-05-312019-02-282018-11-302018-08-312018-05-312018-02-282017-11-302017-08-312017-05-312017-02-282016-11-302016-08-312016-05-312016-02-292015-11-302015-08-312015-05-312015-02-282014-11-302014-08-312014-05-312014-02-282013-11-302013-08-312013-05-312013-02-28
Value1555000.01768000.01552000.01483000.01605000.01634000.01180000.01562000.01498000.01664000.01608000.01610000.01634000.01679000.01591000.01604000.01556000.01719000.01315000.01536000.01624000.01692000.01601000.01513000.01532000.01518000.01410000.01509000.01470000.01633000.01805000.01626000.01267000.01369000.0
Percentage of SalariesAndWages100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod us-gaap:AwardType

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod

ng:PerformanceShareUnits


Share
Period End2021-05-312021-02-282020-11-30
Value0648000.00
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod0.0100.00.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate


Share
Period End2021-05-312021-02-282020-11-302020-08-312020-05-312020-02-292019-11-302019-08-312019-05-312019-02-282018-11-302018-08-312018-05-312018-02-282017-11-302017-08-312017-05-312017-02-282016-11-302016-08-312016-05-312016-02-29
Value047.3-0.145.7380.0020.460000.4690000.50000.50000.54
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate0.0100.0100.0100.0100.0100.00.00.00.0100.00.00.00.0100.00.00.00.0100.00.00.00.0100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate


Share
Period End2021-05-312021-02-282020-11-302020-08-312020-05-312020-02-292019-11-302019-08-312019-05-312019-02-282018-11-302018-08-312018-05-312018-02-282017-11-302017-08-312017-05-312017-02-282016-02-29
Value00.301.485-0.0010.0160000.0270000.01800-0.00150.01350.005
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate0.0100.00.0100.0100.0100.00.00.00.0100.00.00.00.0100.00.00.0100.0100.0100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue


Share
Period End2021-05-312021-02-282020-11-302020-08-312020-05-312020-02-292019-11-302019-08-312019-05-312019-02-282017-11-302017-08-312016-11-302016-08-31
Value1.8793.5058.9390.0104.8795.655110.4682.8673.410.6623.7690.246
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross


Share
Period End2021-05-312021-02-282020-11-302016-02-292015-02-282014-02-28
Value01218000.004586700.04359000.06092000.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross0.0100.00.0100.0100.0100.0

us-gaap:ShortTermLeaseCost

us-gaap:ShortTermLeaseCost


Short
Period End2020-11-30
Value1000.0
Percentage of ShortTermLeaseCost100.0

us-gaap:StockIssuedDuringPeriodSharesShareBasedCompensation us-gaap:AwardType

us-gaap:StockIssuedDuringPeriodSharesShareBasedCompensation

ng:PerformanceShareUnits


Stock
Period End2021-05-312021-02-282020-11-302020-08-312020-05-312020-02-292019-11-302019-08-312019-05-312019-02-282018-11-302017-11-302017-08-312017-05-312017-02-282016-11-302016-08-312015-12-01
Value0574000.0000648000.0000438000.00-43000.0043000.01513000.0-1149000.001377400.0
Percentage of StockIssuedDuringPeriodSharesShareBasedCompensation0.0100.00.00.00.0100.00.00.00.0100.00.0100.00.0100.0100.0100.00.0100.0

us-gaap:StockIssuedDuringPeriodSharesShareBasedCompensation us-gaap:AwardType, us-gaap:StatementEquityComponents

ng:PerformanceShareUnits, us-gaap:CommonStock


Stock
Period End2021-02-282020-02-292019-02-28
Value574000.0410000.0438000.0
Percentage of StockIssuedDuringPeriodSharesShareBasedCompensation100.063.3100.0

us-gaap:StockIssuedDuringPeriodSharesStockOptionsExercised

us-gaap:StockIssuedDuringPeriodSharesStockOptionsExercised


Stock
Period End2021-05-312021-02-282020-11-302020-08-312020-05-312020-02-292019-11-302019-08-312019-05-312019-02-282018-11-302018-08-312018-05-312018-02-28
Value364000.0557000.01244000.001573000.01088000.01309000.02930000.0485000.03253000.01524000.0366000.0781280.0725.0
Percentage of StockIssuedDuringPeriodSharesStockOptionsExercised100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StockIssuedDuringPeriodSharesStockOptionsExercised us-gaap:StatementEquityComponents

us-gaap:CommonStock


Stock
Period End2021-05-312021-02-282020-05-312020-02-292019-08-312019-05-312019-02-282018-08-312018-05-312018-02-282017-08-312017-05-312017-02-28
Value194000.0345000.0998000.0560000.01447000.0205000.01443000.0146000.024000.083000.046000.012000.0124000.0
Percentage of StockIssuedDuringPeriodSharesStockOptionsExercised53.361.963.451.549.442.344.439.93.111448.30.00.00.0

us-gaap:StockIssuedDuringPeriodValueShareBasedCompensation us-gaap:AwardType, us-gaap:StatementEquityComponents

us-gaap:StockIssuedDuringPeriodValueShareBasedCompensation

ng:PerformanceShareUnits, us-gaap:AdditionalPaidInCapital


Stock
Period End2021-02-282020-02-292019-02-28
Value-1.46-1.026-2.737
Percentage of StockIssuedDuringPeriodValueShareBasedCompensation100.0100.0100.0

ng:PerformanceShareUnits, us-gaap:CommonStock


Stock
Period End2021-02-282020-02-292019-02-28
Value1.461.0262.737
Percentage of StockIssuedDuringPeriodValueShareBasedCompensation-100.0-100.0-100.0

us-gaap:StockIssuedDuringPeriodValueShareBasedCompensationGross us-gaap:AwardType

us-gaap:StockIssuedDuringPeriodValueShareBasedCompensationGross

ng:PerformanceShareUnits


Stock
Period End2021-05-312021-02-282020-11-302020-08-312020-05-312020-02-292019-11-302019-08-312019-05-312019-02-282018-11-302017-11-302017-08-312017-05-312017-02-28
Value0.05.7230.00.00.02.8550.00.00.01.6070.02.4260.0-2.4266.932
Percentage of StockIssuedDuringPeriodValueShareBasedCompensationGross0.0100.00.00.00.0100.00.00.00.0100.00.0100.00.0100.0100.0

us-gaap:StockIssuedDuringPeriodValueStockOptionsExercised us-gaap:StatementEquityComponents

us-gaap:StockIssuedDuringPeriodValueStockOptionsExercised

us-gaap:AdditionalPaidInCapital


Stock
Period End2021-05-312021-02-282020-05-312020-02-292019-08-312019-05-312019-02-282018-08-312018-05-312018-02-282017-08-312017-05-312017-02-28
Value-618000.0-777000.0-2082000.0-1618000.0-3251000.0-468000.0-2867000.0-389000.0-59000.0-977000.0-662000.0-288000.0-654000.0
Percentage of StockIssuedDuringPeriodValueStockOptionsExercised100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:CommonStock


Stock
Period End2021-05-312021-02-282020-05-312020-02-292019-08-312019-05-312019-02-282018-08-312018-05-312018-02-282017-08-312017-05-312017-02-28
Value618000.0777000.02082000.01618000.03251000.0468000.02867000.0389000.059000.0977000.0662000.0288000.0654000.0
Percentage of StockIssuedDuringPeriodValueStockOptionsExercised-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0

us-gaap:VariableLeaseCost

us-gaap:VariableLeaseCost


Variable
Period End2020-11-30
Value38000.0
Percentage of VariableLeaseCost100.0

ng:DeferredTaxAssetsInvestmentInNoncontrolledAffiliates

ng:DeferredTaxAssetsInvestmentInNoncontrolledAffiliates


Deferred
Period End2020-11-302019-11-302018-11-302017-11-302016-11-302015-11-30
Value353331444242
Percentage of DeferredTaxAssetsInvestmentInNoncontrolledAffiliates100.0100.0100.0100.0100.0100.0

ng:DeferredTaxAssetsMineralProperties

ng:DeferredTaxAssetsMineralProperties


Deferred
Period End2020-11-302019-11-302018-11-302017-11-302016-11-302015-11-30
Value0.6540.6380.637171616
Percentage of DeferredTaxAssetsMineralProperties100.0100.0100.0100.0100.0100.0

ng:DeferredTaxLiabilitiesNotesReceivable

ng:DeferredTaxLiabilitiesNotesReceivable


Deferred
Period End2020-11-302019-11-302018-11-30
Value1975000.0759000.082000.0
Percentage of DeferredTaxLiabilitiesNotesReceivable100.0100.0100.0

ng:FinancingReceivableAccumulatedAccretion us-gaap:AccountsNotesLoansAndFinancingReceivableByReceivableType

ng:FinancingReceivableAccumulatedAccretion

ng:NoteReceivableUponApprovalOfGaloreCreekProjectConstructionPlan


Financing
Period End2021-05-312020-11-302020-08-31
Value9326000.07618000.06764000.0
Percentage of FinancingReceivableAccumulatedAccretion100.0100.0100.0

ng:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFour

ng:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFour


Lessee
Period End2020-08-31
Value8000.0
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFour100.0

ng:OfficeEquipment

ng:OfficeEquipment


Office
Period End2021-05-312021-02-282020-11-302020-08-312020-05-312020-02-292019-11-302018-11-302017-11-302016-11-302015-11-30
Value30000.032000.034000.036000.038000.040000.042000.039000.048000.058000.090000.0
Percentage of OfficeEquipment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

ng:ReclamationAndLeaseLiability us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

ng:ReclamationAndLeaseLiability

ng:DonlinGold


Reclamation
Period End2021-05-312021-02-282020-11-302020-08-312020-05-312020-02-292019-11-30
Value688000.0708000.0723000.0837000.0857000.0864000.0692000.0
Percentage of ReclamationAndLeaseLiability100.0100.0100.0100.0100.0100.0100.0

ng:ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfCommonSharesPerAwardAdjustedMultiplier us-gaap:Range, us-gaap:AwardType

ng:ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfCommonSharesPerAwardAdjustedMultiplier

srt:Maximum, ng:PerformanceShareUnits


Share
Period End2020-11-302019-11-302018-11-30
Value150.01.51.5
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfCommonSharesPerAwardAdjustedMultiplier100.0100.0100.0

ng:ShareBasedCompensationArrangementByShareBasedPaymentAwardPortionVestingPerYear us-gaap:AwardType

ng:ShareBasedCompensationArrangementByShareBasedPaymentAwardPortionVestingPerYear

us-gaap:EmployeeStockOption


Share
Period End2020-11-30
Value33.33
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardPortionVestingPerYear100.0

us-gaap:AccountsAndOtherReceivablesNetCurrent

us-gaap:AccountsAndOtherReceivablesNetCurrent


Accounts
Period End2021-05-312021-02-282020-11-302020-08-312020-05-312020-02-292019-11-302018-11-302017-11-302016-11-302015-11-302014-11-30
Value69000.098000.0577000.01005000.0687000.0544000.01100000.01781000.0303000.0547000.0295000.0137000.0
Percentage of AccountsAndOtherReceivablesNetCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AccountsReceivableRelatedParties us-gaap:RelatedPartyTransactionsByRelatedParty

us-gaap:AccountsReceivableRelatedParties

ng:DonlinGold


Accounts
Period End2020-11-302019-11-302019-08-312019-05-312019-02-282018-11-30
Value6000.0044000.044000.0247000.0247000.0
Percentage of AccountsReceivableRelatedParties100.00.0100.0100.0100.0100.0

us-gaap:AssetsNet us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

us-gaap:AssetsNet

ng:DonlinGold


Assets
Period End2021-05-312021-02-282020-11-302020-08-312020-05-312020-02-292019-11-30
Value36353436353433
Percentage of AssetsNet100.0100.0100.0100.0100.0100.0100.0

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations


Cash
Period End2021-05-312021-02-282020-11-302020-08-312020-05-312020-02-292019-11-302019-08-312019-05-312019-02-282018-11-302018-08-312018-05-312018-02-282017-11-302016-11-30
Value51636045535967531722211318202730
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredIncomeTaxLiabilities

us-gaap:DeferredIncomeTaxLiabilities


Deferred
Period End2020-11-302019-11-302018-11-302017-11-302016-11-302015-11-302014-11-302013-11-30
Value2.0931.0220.6935248-49.264-57.373-67.674
Percentage of DeferredIncomeTaxLiabilities100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredTaxAssetsCapitalLossCarryforwards

us-gaap:DeferredTaxAssetsCapitalLossCarryforwards


Deferred
Period End2020-11-302019-11-302018-11-302017-11-302016-11-302015-11-302014-11-302013-11-302012-11-30
Value494748333131374041
Percentage of DeferredTaxAssetsCapitalLossCarryforwards100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredTaxAssetsGoodwillAndIntangibleAssets

us-gaap:DeferredTaxAssetsGoodwillAndIntangibleAssets


Deferred
Period End2020-11-302019-11-302018-11-302017-11-302016-11-30
Value484000.0473000.0472000.0494000.0456000.0
Percentage of DeferredTaxAssetsGoodwillAndIntangibleAssets100.0100.0100.0100.0100.0

us-gaap:DeferredTaxAssetsGross

us-gaap:DeferredTaxAssetsGross


Deferred
Period End2020-11-302019-11-302018-11-302017-11-302016-11-302015-11-302014-11-302013-11-302012-11-30
Value273261254338320314325330316
Percentage of DeferredTaxAssetsGross100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredTaxAssetsInvestments

us-gaap:DeferredTaxAssetsInvestments


Deferred
Period End2020-11-302019-11-302018-11-302017-11-302016-11-30
Value316000.0368000.0380000.0329000.0319000.0
Percentage of DeferredTaxAssetsInvestments100.0100.0100.0100.0100.0

us-gaap:DeferredTaxAssetsOperatingLossCarryforwards

us-gaap:DeferredTaxAssetsOperatingLossCarryforwards


Deferred
Period End2020-11-302019-11-302018-11-302017-11-302016-11-302015-11-302014-11-302013-11-302012-11-30
Value183175170233222212214215203
Percentage of DeferredTaxAssetsOperatingLossCarryforwards100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredTaxAssetsOther

us-gaap:DeferredTaxAssetsOther


Deferred
Period End2020-11-302019-11-302018-11-302017-11-302016-11-302015-11-302014-11-302013-11-302012-11-30
Value685000.0569000.0775000.01200000.01912000.02339000.02550000.02322000.01496000.0
Percentage of DeferredTaxAssetsOther100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredTaxAssetsPropertyPlantAndEquipment

us-gaap:DeferredTaxAssetsPropertyPlantAndEquipment


Deferred
Period End2020-11-302019-11-302018-11-302017-11-302016-11-302015-11-302014-11-302013-11-302012-11-30
Value203000.0194000.0194000.0224000.0203000.0198000.0354000.0381000.04226000.0
Percentage of DeferredTaxAssetsPropertyPlantAndEquipment100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities

us-gaap:DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities


Deferred
Period End2020-11-302019-11-302018-11-302017-11-302016-11-302015-11-302014-11-302013-11-302012-11-30
Value2105000.02105000.02105000.03044000.03044000.04458000.04458000.03044000.03043000.0
Percentage of DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredTaxLiabilitiesPropertyPlantAndEquipment

us-gaap:DeferredTaxLiabilitiesPropertyPlantAndEquipment


Deferred
Period End2020-11-302019-11-302018-11-302017-11-302016-11-302015-11-302014-11-302013-11-302012-11-30
Value118000.0255000.0685000.0177000.0859000.0-1052000.0-1102000.0-719000.0-166000.0
Percentage of DeferredTaxLiabilitiesPropertyPlantAndEquipment100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DepositsAssets

us-gaap:DepositsAssets


Deposits
Period End2021-05-312021-02-282020-11-302020-08-312020-05-312020-02-292019-11-302019-08-312019-05-312019-02-282018-11-302018-08-312018-05-312018-02-282017-11-302017-08-312017-05-312017-02-282016-11-302016-08-312016-05-312016-02-292015-11-30
Value55516181818181991391391461525256566671807580808085
Percentage of DepositsAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:EmployeeRelatedLiabilitiesCurrent

us-gaap:EmployeeRelatedLiabilitiesCurrent


Employee
Period End2021-05-312021-02-282020-11-302020-08-312020-05-312020-02-292019-11-302019-08-312019-05-312019-02-282018-11-302018-08-312018-05-312018-02-282017-11-302016-11-30
Value1178000.0627000.02215000.01674000.01115000.0687000.02143000.02163000.01214000.0616000.02545000.01960000.01307000.0663000.02513000.02185000.0
Percentage of EmployeeRelatedLiabilitiesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized us-gaap:AwardType

us-gaap:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized

ng:PerformanceShareUnits


Employee
Period End2021-05-312020-11-302020-08-312020-05-31
Value5253000.03144000.03779000.04215000.0
Percentage of EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized100.0100.0100.0100.0

us-gaap:EmployeeStockOption


Employee
Period End2021-05-312021-02-282020-08-312020-05-31
Value5031000.06022000.03810000.04609000.0
Percentage of EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized95.80.0100.8109.3

us-gaap:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions

us-gaap:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions


Employee
Period End2020-11-30
Value2642000.0
Percentage of EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions100.0

us-gaap:EquityMethodInvestmentOwnershipPercentage dei:LegalEntity, us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

us-gaap:EquityMethodInvestmentOwnershipPercentage

ng:Barrick, ng:DonlinGold


Equity
Period End2021-05-312021-02-282020-11-302020-08-312020-05-312020-02-292019-11-302019-08-312019-05-312019-02-282018-11-302018-08-312018-05-312018-02-282017-11-302017-08-312017-05-312017-02-282016-11-30
Value50.050.050.050.00.50.50.50.50.50.50.50.50.50.50.50.50.50.50.5
Percentage of EquityMethodInvestmentOwnershipPercentage100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:EquityMethodInvestmentOwnershipPercentage us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

ng:DonlinGold


Equity
Period End2021-05-312021-02-282020-11-302020-08-312020-05-312020-02-292019-11-302019-08-312019-05-312019-02-282018-11-302018-08-312018-05-312018-02-282017-11-302017-08-312017-05-312017-02-282016-11-30
Value50.050.050.050.00.50.50.50.50.50.50.50.50.50.50.50.50.50.50.5
Percentage of EquityMethodInvestmentOwnershipPercentage100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:EquityMethodInvestments us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

us-gaap:EquityMethodInvestments

ng:DonlinGold


Equity
Period End2021-05-312021-02-282020-11-302020-08-312020-05-312020-02-292019-11-302019-08-312019-05-312019-02-282018-11-302018-08-312018-05-312018-02-282017-11-302017-08-312017-05-312017-02-282016-11-302016-08-312016-05-312016-02-292015-11-302014-11-302013-11-30
Value4.5723.5922.6144.0053.4622.8721.842.1931.4940.7831.2091.6421.8240.9931.11.1971.31.2790.9511.7611.2870.9031.0581.6181.72
Percentage of EquityMethodInvestments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InterestPayableCurrentAndNoncurrent us-gaap:LineOfCreditFacility, us-gaap:LongtermDebtType

us-gaap:InterestPayableCurrentAndNoncurrent

ng:Barrick, us-gaap:NotesPayableOtherPayables


Interest
Period End2021-05-312021-02-282020-08-31
Value615956
Percentage of InterestPayableCurrentAndNoncurrent100.0100.0100.0

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths


Lessee
Period End2020-11-302020-08-31
Value232000.0231000.0
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths100.0100.0

us-gaap:LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear

us-gaap:LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear


Lessee
Period End2020-08-31
Value55000.0
Percentage of LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear100.0

us-gaap:LongTermNotesPayable

us-gaap:LongTermNotesPayable


Long
Period End2021-05-312021-02-282020-11-302020-08-312020-05-312020-02-292019-11-302019-08-312019-05-312019-02-282018-11-302018-08-312018-05-312018-02-282017-11-302017-08-312017-05-312017-02-282016-11-30
Value11211110910810610510310210098969493919088878684
Percentage of LongTermNotesPayable100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:MarketableSecuritiesNoncurrent

us-gaap:MarketableSecuritiesNoncurrent


Marketable
Period End2021-05-312021-02-282020-11-302020-08-312020-05-312020-02-292019-11-302018-11-302017-11-302016-11-302015-11-302014-11-30
Value2010000.01661000.01402000.01637000.01184000.0915000.0935000.0839000.01448000.01117000.0571000.0901000.0
Percentage of MarketableSecuritiesNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:MineralPropertiesNet us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

us-gaap:MineralPropertiesNet

ng:DonlinGold


Mineral
Period End2021-05-312021-02-282020-11-302020-08-312020-05-312020-02-292019-11-30
Value32323232323232
Percentage of MineralPropertiesNet100.0100.0100.0100.0100.0100.0100.0

us-gaap:NotesAndLoansReceivableNetCurrent

us-gaap:NotesAndLoansReceivableNetCurrent


Notes
Period End2021-05-312021-02-282020-11-302020-08-312016-11-302015-11-30
Value747372720.9350.919
Percentage of NotesAndLoansReceivableNetCurrent100.0100.0100.0100.0100.0100.0

us-gaap:NotesAndLoansReceivableNetNoncurrent

us-gaap:NotesAndLoansReceivableNetNoncurrent


Notes
Period End2021-05-312021-02-282020-11-302020-08-312020-05-312020-02-292019-11-302019-08-312019-05-312019-02-282018-11-302018-08-312015-11-30
Value2322232294939291919089880.939
Percentage of NotesAndLoansReceivableNetNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:NotesPayable

us-gaap:NotesPayable


Notes
Period End2020-11-302019-11-302018-11-302017-11-302016-11-302015-08-312015-05-312015-02-282014-11-302014-08-312014-05-312014-02-282013-11-302012-11-30
Value109103969084797877767574737168
Percentage of NotesPayable100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:NotesPayable us-gaap:LineOfCreditFacility, us-gaap:LongtermDebtType

ng:Barrick, us-gaap:NotesPayableOtherPayables


Notes
Period End2021-05-312021-02-282020-11-302020-08-312019-11-30
Value112111109108103
Percentage of NotesPayable0.00.0100.00.0100.0

us-gaap:NotesReceivableFairValueDisclosure us-gaap:AccountsNotesLoansAndFinancingReceivableByReceivableType

us-gaap:NotesReceivableFairValueDisclosure

ng:NoteReceivableUponApprovalOfGaloreCreekProjectConstructionPlan


Notes
Period End2021-05-312020-11-302020-08-312020-05-312020-02-292019-05-312018-11-302018-07-27
Value9796959493910.00.0
Percentage of NotesReceivableFairValueDisclosure100.0100.0100.0100.0100.0100.00.00.0

us-gaap:NotesReceivableNet

us-gaap:NotesReceivableNet


Notes
Period End2020-11-302019-11-302018-11-302017-11-302016-11-30
Value9692890.00.0
Percentage of NotesReceivableNet100.0100.0100.00.00.0

us-gaap:OperatingLossCarryforwards us-gaap:IncomeTaxAuthority, us-gaap:IncomeTaxAuthorityName

us-gaap:OperatingLossCarryforwards

us-gaap:DomesticCountry, us-gaap:CanadaRevenueAgency


Operating
Period End2020-11-302019-11-302018-11-302017-11-302016-11-30
Value155138133168151
Percentage of OperatingLossCarryforwards100.0100.0100.0100.0100.0

us-gaap:ForeignCountry, us-gaap:InternalRevenueServiceIRS


Operating
Period End2020-11-302019-11-302018-11-302017-11-302016-11-30
Value497485471458443
Percentage of OperatingLossCarryforwards320.9351.1353.8272.5292.4

us-gaap:OperatingLossCarryforwards us-gaap:IncomeTaxAuthority, us-gaap:IncomeTaxAuthorityName, us-gaap:TaxPeriod

us-gaap:DomesticCountry, us-gaap:CanadaRevenueAgency, ng:ExpiringIn2026


Operating
Period End2020-11-302019-11-302018-11-302017-11-302016-11-30
Value1918182524
Percentage of OperatingLossCarryforwards12.413.514.015.116.0

us-gaap:DomesticCountry, us-gaap:CanadaRevenueAgency, ng:ExpiringIn2027


Operating
Period End2020-11-302019-11-302018-11-302017-11-302016-11-30
Value1.8611.8161.8144.0773.913
Percentage of OperatingLossCarryforwards1.21.31.42.42.6

us-gaap:DomesticCountry, us-gaap:CanadaRevenueAgency, ng:ExpiringIn2029


Operating
Period End2020-11-302019-11-302018-11-302017-11-302016-11-30
Value1211111212
Percentage of OperatingLossCarryforwards7.88.58.87.58.0

us-gaap:DomesticCountry, us-gaap:CanadaRevenueAgency, ng:ExpiringIn2030


Operating
Period End2020-11-302019-11-302018-11-302017-11-302016-11-30
Value1615151817
Percentage of OperatingLossCarryforwards10.411.311.710.811.5

us-gaap:DomesticCountry, us-gaap:CanadaRevenueAgency, ng:ExpiringIn2031


Operating
Period End2020-11-302019-11-302018-11-302017-11-302016-11-30
Value1515151716
Percentage of OperatingLossCarryforwards10.311.311.710.210.8

us-gaap:DomesticCountry, us-gaap:CanadaRevenueAgency, ng:ExpiringIn2032


Operating
Period End2020-11-302019-11-302018-11-302017-11-302016-11-30
Value1919192928
Percentage of OperatingLossCarryforwards12.613.814.317.819.0

us-gaap:DomesticCountry, us-gaap:CanadaRevenueAgency, ng:ExpiringIn2033


Operating
Period End2020-11-302019-11-302018-11-302017-11-302016-11-30
Value1414142221
Percentage of OperatingLossCarryforwards9.510.410.813.314.2

us-gaap:DomesticCountry, us-gaap:CanadaRevenueAgency, ng:ExpiringIn2034


Operating
Period End2020-11-302019-11-302018-11-302017-11-302016-11-30
Value107.5697.563109.964
Percentage of OperatingLossCarryforwards6.85.55.76.26.6

us-gaap:DomesticCountry, us-gaap:CanadaRevenueAgency, ng:ExpiringIn2035


Operating
Period End2020-11-302019-11-302018-11-302017-11-302016-11-30
Value9.6665.4685.4636.8726.595
Percentage of OperatingLossCarryforwards6.24.04.14.14.3

us-gaap:DomesticCountry, us-gaap:CanadaRevenueAgency, ng:ExpiringIn2036


Operating
Period End2020-11-302019-11-302018-11-302017-11-302016-11-30
Value9.5128.1028.0959.43310
Percentage of OperatingLossCarryforwards6.15.96.15.66.6

us-gaap:DomesticCountry, us-gaap:CanadaRevenueAgency, ng:ExpiringIn2037


Operating
Period End2020-11-302019-11-302018-11-302017-11-30
Value6.3297.9437.93611
Percentage of OperatingLossCarryforwards4.15.76.06.6

us-gaap:DomesticCountry, us-gaap:CanadaRevenueAgency, ng:ExpiringIn2038


Operating
Period End2020-11-302019-11-302018-11-30
Value6.4337.3487.342
Percentage of OperatingLossCarryforwards4.15.35.5

us-gaap:DomesticCountry, us-gaap:CanadaRevenueAgency, ng:ExpiringIn2039


Operating
Period End2020-11-302019-11-30
Value5.8434.888
Percentage of OperatingLossCarryforwards3.83.5

us-gaap:ForeignCountry, us-gaap:CanadaRevenueAgency, ng:ExpiringIn2040


Operating
Period End2020-11-30
Value7.365
Percentage of OperatingLossCarryforwards4.7

us-gaap:ForeignCountry, us-gaap:InternalRevenueServiceIRS, ng:ExpiringIn2036


Operating
Period End2020-11-302019-11-302018-11-302017-11-302016-11-30
Value1414141414
Percentage of OperatingLossCarryforwards9.510.711.18.89.6

us-gaap:ForeignCountry, us-gaap:InternalRevenueServiceIRS, ng:ExpiringIn2037


Operating
Period End2020-11-302019-11-302018-11-302017-11-30
Value14141414
Percentage of OperatingLossCarryforwards9.110.210.68.4

us-gaap:ForeignCountry, us-gaap:InternalRevenueServiceIRS, ng:Indefinite


Operating
Period End2020-11-302019-11-302018-11-30
Value392713
Percentage of OperatingLossCarryforwards25.419.79.9

us-gaap:PrepaidExpenseCurrent

us-gaap:PrepaidExpenseCurrent


Prepaid
Period End2021-05-312021-02-282020-11-302020-08-312020-05-312020-02-292019-11-302018-11-302017-11-302016-11-302015-11-302014-11-30
Value785000.01038000.01292000.0153000.0326000.0508000.0690000.0598000.0580000.0554000.0581000.0727000.0
Percentage of PrepaidExpenseCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber us-gaap:AwardType

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber

ng:PerformanceShareUnits


Share
Period End2021-05-312021-02-282020-11-302020-08-312020-05-312020-02-292019-11-302019-08-312019-05-312019-02-282018-11-302018-08-312018-05-312018-02-282017-11-302017-08-312017-05-312016-11-302015-11-30
Value1583000.01583000.01684000.01684000.01684000.01684000.01664000.01664000.01664000.01669100.01797400.01797000.01797000.01809000.02176000.02176000.02180000.02619000.03182000.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant


Share
Period End2020-11-30
Value27
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber


Share
Period End2021-05-312021-02-282020-11-302020-08-31
Value7364000.07620000.05722000.06966000.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber100.0100.0100.0100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue


Share
Period End2021-05-312021-02-282020-11-302020-05-31
Value53365671
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue100.0100.0100.0100.0

us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueNonvested us-gaap:AwardType

us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueNonvested

ng:PerformanceShareUnits


Sharebased
Period End2021-05-312021-02-282020-11-302020-08-31
Value22162423
Percentage of SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueNonvested100.0100.0100.0100.0

us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1

us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1


Sharebased
Period End2021-05-312021-02-282020-11-302020-05-31
Value43303345
Percentage of SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1100.0100.0100.0100.0

us-gaap:TaxCreditCarryforwardAmount us-gaap:TaxCreditCarryforward

us-gaap:TaxCreditCarryforwardAmount

us-gaap:CapitalLossCarryforward


Tax
Period End2020-11-302019-11-302018-11-302017-11-30
Value364354355248
Percentage of TaxCreditCarryforwardAmount100.0100.0100.0100.0

Line plots across dimensions of each concept


us-gaap:AllocatedShareBasedCompensationExpense
us-gaap:AwardType
(None,)
Allocated Share Based Compensation Expenseus-gaap: Award Type
us-gaap:StockholdersEquity
us-gaap:StatementEquityComponents
(None,)
Stockholders Equityus-gaap: Statement Equity Components
us-gaap:StockholdersEquity
us-gaap:StatementEquityComponents
(None,)
Stockholders Equityus-gaap: Statement Equity Components