FND

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

Plots across concepts

IncomeStatement

Expenses

Balance Sheet

Assets

Current Assets

NonCurrent Assets

PropertyPlantAndEquipmentNet

Liabilities

Current Liabilities

Noncurrent Liabilities

Stockholders Equity

CashFlow

NetCashProvidedByUsedInOperatingActivities

OperatingLeaseLiability

LesseeOperatingLeaseLiabilityPaymentsDue

Tables

		2021-07-01	2021-04-01	2020-12-31	2020-09-24	2020-06-25	2020-03-26	2019-12-26	2019-09-26	2019-06-27	2019-03-28	2018-12-27	2018-09-27	2018-06-28	2018-03-29	2017-12-28	2017-09-28	2017-06-29	2017-03-30	2016-12-29	2016-09-29	2016-06-30	2016-03-31
us-gaap:CommonStockValue us-gaap:StatementClassOfStock us-gaap:CommonClassA	████▇▇▇▇▇▆▆▆▆▆▆▆▃▁▁	0.105	0.105	0.104	0.104	0.103	0.102	0.101	0.101	0.099	0.098	0.098	0.097	0.097	0.096	0.096	0.095	0.087	0.077	0.077	NA	NA	NA
us-gaap:CommonStockSharesIssued us-gaap:StatementClassOfStock,us-gaap:StatementEquityComponents us-gaap:CommonClassA,us-gaap:CommonStock	██▇▇▇▆▅▅▄▃▃▂▂▁▁	105.111	104.629	104.368	103.909	103.147	102.309	101.458	101.025	99.111	97.997	97.588	97.326	97.218	96.094	95.509	NA	NA	NA	76.847	NA	NA	NA
us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding	█▁	107.265	107.099	NA	106.379	105.466	105.51	NA	105.18	104.84	104.321	NA	104.565	104.937	104.665	NA	103.899602	99.918949	0.088645	NA	88.368689	87.898189	0.086669
us-gaap:WeightedAverageNumberOfSharesOutstandingBasic	█▁	104.544	104.073	NA	103.18	102.114	101.629	NA	100.137	98.642	97.785	NA	97.254	96.684	95.714	NA	94.439204	90.861205	0.083529	NA	83.457037	83.385114	0.083376
us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecurities us-gaap:EmployeeStockOption	▁█	0.067	0.081	NA	0.266	0.591	0.59	NA	0.281	1.011	0.986	NA	0.209	0.181	0.098	NA	0.011664	0.892356	2.36	NA	1.903466	1.714986	2.208
us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecurities us-gaap:RestrictedStock	▁█	0.001	0.018	NA	NA	0.26	0.284	NA	NA	0.0	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA
us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecurities us-gaap:RestrictedStockUnitsRSU	▁█	0.006	0.1	NA	NA	0.106	0.108	NA	NA	0.0	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA
us-gaap:EarningsPerShareBasic	█▇▆▇▃▄▄▄▅▃▂▃▄▄▅▃▃▂▂▂▁▁	0.79	0.73	0.55	0.67	0.31	0.36	0.35	0.41	0.44	0.31	0.18	0.27	0.41	0.33	0.51	0.25	0.22	0.13	0.2	0.17	0.06	0.09
us-gaap:EarningsPerShareDiluted	█▇▆▇▃▄▄▄▅▃▂▃▄▃▅▃▂▂▂▂▁▁	0.77	0.71	0.54	0.65	0.3	0.35	0.34	0.39	0.42	0.29	0.17	0.25	0.38	0.3	0.46	0.22	0.2	0.13	0.19	0.16	0.06	0.08

		2021-07-01	2021-04-01	2020-12-31	2020-09-24	2020-06-25	2020-03-26	2019-12-26	2019-09-26	2019-06-27	2019-03-28	2018-12-27	2018-09-27	2018-06-28	2018-03-29	2017-12-28	2017-09-28	2017-06-29	2017-03-30	2016-12-29	2016-09-29	2016-06-30	2016-03-31

		2021-07-01	2021-04-01	2020-12-31	2020-09-24	2020-06-25	2020-03-26	2019-12-26	2019-09-26	2019-06-27	2019-03-28	2018-12-27	2018-09-27	2018-06-28	2018-03-29	2017-12-28	2017-09-28	2017-06-29	2017-03-30	2016-12-29	2016-09-29	2016-06-30	2016-03-31
TTM Greenblatt ROC _ _	██▅▆▁▃▃▂▃▃▁▂▃▂▂▂▂▁▁	98.557	95.949	68.014	78.802	21.089	46.674	42.124	31.4	45.895	39.762	23.313	34.237	37.245	36.506	32.401	28.596	34.102	22.672	19.97	NA	NA	NA

		2021-07-01	2021-04-01	2020-12-31	2020-09-24	2020-06-25	2020-03-26	2019-12-26	2019-09-26	2019-06-27	2019-03-28	2018-12-27	2018-09-27	2018-06-28	2018-03-29	2017-12-28	2017-09-28	2017-06-29	2017-03-30	2016-12-29	2016-09-29	2016-06-30	2016-03-31
us-gaap:AllocatedShareBasedCompensationExpense	█▇▆▆▆▃▁▂	5.4	4.7	4.600000000000001	4.4	4.2	2.9	2.0	2.3	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA
us-gaap:ComprehensiveIncomeNetOfTax	█▇▆▇▃▄▄▄▄▃▂▃▄▃▅▃▂▂▂▂▁▁	82.909	75.879	57.248	68.863	32.096	37.131	35.509	40.974	43.383	30.386	17.497	26.699	40.081	32.301	48.482	23.134	19.945	10.846	16.916	14.263	5.035	7.101
us-gaap:CostOfGoodsAndServicesSold	█▇▆▆▃▅▄▄▄▄▃▃▃▃▃▂▂▂▁▁▁▁	494.67	445.604	416.112	390.219	265.66	318.905	296.973	307.305	302.488	275.676	255.721	257.656	256.641	237.562	227.127	201.432	201.819	181.825	163.548	160.344	156.201	141.404
us-gaap:CostOfRevenue	█▇▆▆▃▅▄▄▄▄▃▃▃▃▃▂▂▂▁▁▁▁	494.67	445.604	416.112	390.219	265.66	318.905	296.973	307.305	302.488	275.676	255.721	257.656	256.641	237.562	227.127	201.432	201.819	181.825	163.548	160.344	156.201	141.404
us-gaap:GainsLossesOnExtinguishmentOfDebt		NA	NA	0.0	0.0	1.015	NA	NA	NA	0.0	NA	NA	0.0	0.0	NA	0.0	0.0	-5.442	NA	-1.66	0.0	-0.153	NA
us-gaap:GeneralAndAdministrativeExpense	█▆▆▆▅▄▅▅▄▄▄▃▃▃▃▂▂▂▁▁▁▁	52.819	44.041	40.858	39.286	33.713	30.858	34.022	37.246	30.916	30.202	30.332	26.477	25.179	23.339	25.09	22.172	19.518	17.881	17.212	16.633	15.61	14.57
us-gaap:GrossProfit	█▇▇▆▄▅▅▄▄▄▃▃▃▃▃▂▂▂▂▁▁▁	365.438	336.933	307.54	294.628	196.692	236.032	230.029	213.788	217.823	201.374	181.018	178.226	177.638	165.386	162.374	142.491	142.228	125.471	114.746	110.967	109.652	93.897
us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	██▆▆▂▄▄▃▄▃▂▃▃▃▃▂▂▂▁▂▁▁	97.264	94.561	65.759	76.778	19.801	44.867	40.445	29.422	43.672	36.841	20.496	32.066	35.1	34.722	30.001	25.986	25.307	17.258	12.869	22.168	8.0	11.476
us-gaap:IncomeTaxExpenseBenefit	▇█▆▆▂▆▅▂▄▆▅▅▄▅▁▅▅▆▄▆▅▅	14.348	18.765	8.619	8.004	-12.203	7.804	5.104	-11.552	0.076	6.121	2.594	5.498	-4.746	2.851	-17.975	2.731	4.878	6.13	-3.838	7.949	2.988	4.375
us-gaap:IncomeTaxesPaidNet	█▄▃▁	22.063	13.055	8.398	4.125	NA	NA	-5.672	0.026	12.099	0.0	0.36	0.085	0.618	0.019	0.45	2.808	11.134	0.0	0.241	-0.004	NA	NA
us-gaap:InterestExpense	▁▁▃▂▃▂▂▂▃▄▄▂▂▂▃▃▄██▃▃▃	1.293	1.388	2.255	2.024	2.303	1.807	1.679	1.978	2.223	2.921	2.817	2.171	2.145	1.784	2.4	2.61	3.353	5.414	5.441	2.401	2.475	2.486
us-gaap:InterestPaidNet	▁▂▄▂▃▂▂▃▃▃▃▃▂▃▃▃▄█▃▂	-0.036	1.376	3.146	1.411	2.188	1.298	1.662	1.814	1.925	1.987	1.831	1.888	1.476	2.368	2.006	2.06	3.737	7.945	2.066	0.662	NA	NA
us-gaap:NetIncomeLoss	█▇▆▇▃▄▄▄▄▃▂▃▄▃▅▃▂▂▂▂▁▁	82.916	75.796	57.14	68.774	32.004	37.063	35.341	40.974	43.596	30.72	17.902	26.568	39.846	31.871	47.976	23.255	20.429	11.128	16.707	14.219	5.012	7.101
us-gaap:OperatingExpenses	█▇▇▆▅▅▅▅▄▄▄▃▃▃▃▂▂▂▂▁▂▁	266.881	240.984	239.526	215.826	175.603	189.358	187.905	182.388	171.928	161.612	157.705	143.989	140.393	128.88	129.973	113.895	108.126	102.799	94.776	86.398	99.024	79.935
us-gaap:OperatingIncomeLoss	██▆▆▂▄▄▃▄▃▂▃▃▃▃▂▃▂▂▂▁▁	98.557	95.949	68.014	78.802	21.089	46.674	42.124	31.4	45.895	39.762	23.313	34.237	37.245	36.506	32.401	28.596	34.102	22.672	19.97	24.569	10.628	13.962
us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax	█▇▆▆▄▅▄▄▄▄▃▃▃▃▃▂▂▂▁▁▁▁	860.108	782.537	723.652	684.847	462.352	554.937	527.002	521.093	520.311	477.05	436.739	435.882	434.279	402.948	389.501	343.923	344.047	307.296	278.294	271.311	265.853	235.301

		2021-07-01	2021-04-01	2020-12-31	2020-09-24	2020-06-25	2020-03-26	2019-12-26	2019-09-26	2019-06-27	2019-03-28	2018-12-27	2018-09-27	2018-06-28	2018-03-29	2017-12-28	2017-09-28	2017-06-29	2017-03-30	2016-12-29	2016-09-29	2016-06-30	2016-03-31

		2021-07-01	2021-04-01	2020-12-31	2020-09-24	2020-06-25	2020-03-26	2019-12-26	2019-09-26	2019-06-27	2019-03-28	2018-12-27	2018-09-27	2018-06-28	2018-03-29	2017-12-28	2017-09-28	2017-06-29	2017-03-30	2016-12-29	2016-09-29	2016-06-30	2016-03-31
us-gaap:Assets	█▇▇▆▆▆▅▅▄▄▂▂▂▂▂▁▁▁▁	3364.295	2964.723	2880.425	2714.396	2528.73	2633.88	2324.309	2156.873	2011.124	1873.351	1234.091	1131.867	1118.41	1075.882	1067.992	1000.931	944.22	868.354	831.166	NA	NA	NA
us-gaap:Liabilities	█▇▇▆▆▆▅▅▄▄▁▁▁▁▁▁▁▂▂	2184.693	1884.003	1883.037	1782.891	1678.234	1824.591	1559.973	1433.833	1340.236	1253.39	649.782	568.191	583.736	588.285	625.132	612.76	583.076	722.245	696.883	NA	NA	NA
us-gaap:LiabilitiesAndStockholdersEquity	█▇▇▆▆▆▅▅▄▄▂▂▂▂▂▁▁▁▁	3364.295	2964.723	2880.425	2714.396	2528.73	2633.88	2324.309	2156.873	2011.124	1873.351	1234.091	1131.867	1118.41	1075.882	1067.992	1000.931	944.22	868.354	831.166	NA	NA	NA
us-gaap:StockholdersEquity	█▇▇▆▆▆▅▅▅▄▄▄▄▃▃▃▃▁▁	1179.602	1080.72	997.388	931.505	850.496	809.289	764.336	723.04	670.888	619.961	584.309	563.676	534.674	487.597	442.86	388.171	361.144	146.109	134.283	NA	NA	NA

		2021-07-01	2021-04-01	2020-12-31	2020-09-24	2020-06-25	2020-03-26	2019-12-26	2019-09-26	2019-06-27	2019-03-28	2018-12-27	2018-09-27	2018-06-28	2018-03-29	2017-12-28	2017-09-28	2017-06-29	2017-03-30	2016-12-29	2016-09-29	2016-06-30	2016-03-31
us-gaap:AssetsCurrent	█▇▇▆▅▆▄▄▃▃▃▂▂▂▂▂▂▁▁	1165.441	1061.875	1040.456	973.969	829.981	950.995	701.486	643.709	564.014	527.398	559.458	486.76	502.309	486.418	503.212	456.307	416.088	359.885	336.215	NA	NA	NA
us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	██▇▆▄▇▂▃▂▁▁▁▁▁▁▁▁	366.093	354.051	307.772	271.126	134.42	289.931	27.037	84.106	51.45	0.451	0.644	0.534	0.547	0.572	0.556	0.567	0.386	NA	0.451	NA	NA	NA
us-gaap:InventoryNet	█▇▇▆▆▆▆▄▄▄▄▃▃▃▃▃▂▁▁	683.811	607.649	654.0	598.461	594.269	588.941	581.865	483.957	446.397	437.504	471.014	403.772	432.446	426.719	427.95	395.62	367.473	316.54	293.702	NA	NA	NA
us-gaap:PrepaidExpenseAndOtherAssetsCurrent	█▇▅▄▃▄▄▄▅▄▃▃▂▂▁▁▁▁▁	42.733	40.173	28.257	23.367	19.203	21.562	20.415	21.113	27.689	23.342	15.949	16.553	12.107	11.096	8.193	7.525	7.648	9.517	7.529	NA	NA	NA

		2021-07-01	2021-04-01	2020-12-31	2020-09-24	2020-06-25	2020-03-26	2019-12-26	2019-09-26	2019-06-27	2019-03-28	2018-12-27	2018-09-27	2018-06-28	2018-03-29	2017-12-28	2017-09-28	2017-06-29	2017-03-30	2016-12-29	2016-09-29	2016-06-30	2016-03-31
us-gaap:AssetsNoncurrent	█▇▇▆▆▆▆▅▅▄▂▂▁▁▁▁▁▁▁	2198.854	1902.848	1839.969	1740.427	1698.749	1682.885	1622.823	1513.164	1447.11	1345.953	674.633	645.107	616.101	589.464	564.78	544.624	528.132	508.469	494.951	NA	NA	NA
us-gaap:PropertyPlantAndEquipmentGross		NA	NA	874.971	NA	NA	NA	680.579	NA	NA	NA	480.049	NA	NA	NA	325.658	NA	NA	NA	220.712	NA	NA	NA
us-gaap:PropertyPlantAndEquipmentGross us-gaap:PropertyPlantAndEquipmentByType fnd:ComputerSoftwareAndHardware		NA	NA	138.321	NA	NA	NA	113.975	NA	NA	NA	83.628	NA	NA	NA	52.687	NA	NA	NA	40.699	NA	NA	NA
us-gaap:PropertyPlantAndEquipmentGross us-gaap:PropertyPlantAndEquipmentByType us-gaap:BuildingAndBuildingImprovements		NA	NA	65.552	NA	NA	NA	11.614	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA
us-gaap:PropertyPlantAndEquipmentGross us-gaap:PropertyPlantAndEquipmentByType us-gaap:FurnitureAndFixtures		NA	NA	259.696	NA	NA	NA	236.555	NA	NA	NA	174.663	NA	NA	NA	126.821	NA	NA	NA	90.787	NA	NA	NA
us-gaap:PropertyPlantAndEquipmentGross us-gaap:PropertyPlantAndEquipmentByType us-gaap:Land		NA	NA	30.731	NA	NA	NA	8.715	NA	NA	NA	5.297	NA	NA	NA	4.976	NA	NA	NA	NA	NA	NA	NA
us-gaap:PropertyPlantAndEquipmentGross us-gaap:PropertyPlantAndEquipmentByType us-gaap:LeaseholdImprovements		NA	NA	380.671	NA	NA	NA	321.334	NA	NA	NA	216.461	NA	NA	NA	141.174	NA	NA	NA	89.226	NA	NA	NA
us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment		NA	NA	295.612	NA	NA	NA	224.29	NA	NA	NA	151.683	NA	NA	NA	104.706	NA	NA	NA	70.241	NA	NA	NA
us-gaap:PropertyPlantAndEquipmentNet	█▇▆▅▅▅▅▄▄▃▃▃▂▂▂▂▁▁▁	727.108	611.311	579.359	506.789	481.77	473.081	456.289	425.498	382.646	338.888	328.366	300.279	271.5	245.407	220.952	200.4	183.649	163.813	150.471	NA	NA	NA
us-gaap:Goodwill	█▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁	255.473	227.447	227.447	227.447	227.447	227.447	227.447	227.447	227.447	227.447	227.447	227.447	227.447	227.447	227.447	227.447	227.447	227.447	227.447	NA	NA	NA
us-gaap:IntangibleAssetsNetExcludingGoodwill	█▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁	153.422	109.269	109.269	109.275	109.283	109.291	109.299	109.307	109.315	109.322	109.33	109.338	109.346	109.354	109.362	109.37	109.378	109.386	109.394	NA	NA	NA
us-gaap:OperatingLeaseRightOfUseAsset	█▇▇▇▇▇▆▆▆▅▁	1055.246	947.451	916.325	890.148	873.115	865.515	822.256	743.517	720.009	659.115	0.0	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA
us-gaap:OtherAssetsNoncurrent	▂▂▂▁▂▂▂▂▂█▅▃▃▂▁▂▂▃▂	7.605	7.37	7.569	6.768	7.134	7.551	7.532	7.395	7.693	11.181	9.49	8.043	7.808	7.256	7.019	7.407	7.658	7.823	7.639	NA	NA	NA

		2021-07-01	2021-04-01	2020-12-31	2020-09-24	2020-06-25	2020-03-26	2019-12-26	2019-09-26	2019-06-27	2019-03-28	2018-12-27	2018-09-27	2018-06-28	2018-03-29	2017-12-28	2017-09-28	2017-06-29	2017-03-30	2016-12-29	2016-09-29	2016-06-30	2016-03-31
us-gaap:AccountsPayableCurrent	█▆▆▅▄▄▅▄▃▂▄▂▃▃▃▃▃▂▁	529.22	402.134	417.898	362.457	326.032	319.815	368.459	318.35	272.695	229.498	313.503	237.785	264.987	255.007	258.73	249.246	243.584	205.939	158.466	NA	NA	NA
us-gaap:AccruedIncomeTaxesCurrent	▁█▇	3.85	13.635	12.391	NA	NA	9.674	0.0	NA	NA	8.765	0.0	NA	NA	NA	NA	0.0	0.0	6.486	5.787	NA	NA	NA
us-gaap:AccruedLiabilitiesCurrent	█▆▆▅▃▃▃▄▃▂▂▂▁▂▂▂▁▁▁	212.466	160.406	162.283	150.054	106.17	100.423	102.807	112.141	97.015	76.39	82.038	77.826	62.162	68.834	74.547	65.878	53.828	56.364	61.505	NA	NA	NA
us-gaap:ContractWithCustomerLiabilityCurrent	█▅▃▄▃▂▂▃▂▂▂▁▁▁█	23.099	15.659	10.115	10.853	8.387	7.189	6.683	8.824	6.967	6.581	5.244	5.047	4.683	3.742	22.523	NA	NA	NA	NA	NA	NA	NA
us-gaap:DebtCurrent	▄	5.469	NA	1.647	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA
us-gaap:LiabilitiesCurrent	█▆▆▅▄▄▅▄▃▃▃▂▂▂▂▂▂▂▁	860.214	672.978	698.836	618.918	533.69	506.497	552.541	492.432	424.638	398.349	404.285	324.158	335.332	331.083	359.3	344.224	322.431	293.215	243.714	NA	NA	NA
us-gaap:LongTermDebtCurrent	▅▅▄▆▆▅▁▁███████████	2.103	2.103	1.647	2.745	2.558	1.808	0.0	0.0	3.5	3.5	3.5	3.5	3.5	3.5	3.5	3.5	3.5	3.5	3.5	NA	NA	NA
us-gaap:OperatingLeaseLiabilityCurrent	▇▇███▆▇▅▄▆▁	86.11	79.041	94.502	92.809	90.543	67.588	74.592	53.117	44.461	73.615	0.0	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA
us-gaap:OtherAccruedLiabilitiesCurrent		NA	NA	24.851	NA	NA	NA	35.449	NA	NA	NA	49.29	NA	NA	NA	57.151	NA	NA	NA	33.064	NA	NA	NA
us-gaap:TaxesPayableCurrent		NA	NA	12.391	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA

		2021-07-01	2021-04-01	2020-12-31	2020-09-24	2020-06-25	2020-03-26	2019-12-26	2019-09-26	2019-06-27	2019-03-28	2018-12-27	2018-09-27	2018-06-28	2018-03-29	2017-12-28	2017-09-28	2017-06-29	2017-03-30	2016-12-29	2016-09-29	2016-06-30	2016-03-31
us-gaap:LiabilitiesNoncurrent	█▇▇▇▇█▆▆▅▅▁▁▁▁▁▁▁▂▂	1324.479	1211.025	1184.201	1163.973	1144.544	1318.094	1007.432	941.401	915.598	855.041	245.497	244.033	248.404	257.202	265.832	268.536	260.645	429.03	453.169	NA	NA	NA
us-gaap:LongTermDebt		NA	NA	208.804	209.538	209.535	415.134	142.606	143.288	143.97	146.752	145.334	146.016	160.298	173.305	189.062	187.419	181.825	354.71	390.743	NA	NA	NA
us-gaap:LongTermDebtNoncurrent	▂▂▃▃▃█▁	195.443	195.546	207.157	206.793	206.977	413.326	142.606	NA	NA	141.152	141.834	142.516	143.198	143.005	144.562	145.819	146.525	336.71	337.243	NA	NA	NA
us-gaap:DeferredFinanceCostsNoncurrentNet us-gaap:DebtInstrument fnd:TermLoanFacility		NA	NA	9.0	NA	NA	NA	2.894	NA	NA	NA	3.666	NA	NA	NA	4.438	NA	NA	NA	NA	NA	NA	NA
us-gaap:DeferredFinanceCostsNoncurrentNet us-gaap:DebtInstrument us-gaap:RevolvingCreditFacility		NA	NA	0.975	NA	NA	NA	0.574	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA
us-gaap:DeferredIncomeTaxLiabilitiesNet	▆▆▅██▁▂▃▄	34.51	32.449	27.99	40.551	38.93	13.633	18.378	20.005	25.173	NA	26.838	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA
us-gaap:OtherLiabilitiesNoncurrent	█▄▄▂▂▂▂▂▂▂▂▂▂▂▁▁▁▁▁	17.07	7.845	7.929	1.928	2.011	2.114	2.179	2.27	2.36	2.451	2.55	2.678	2.604	3.164	0.703	0.676	0.648	0.625	0.592	NA	NA	NA
us-gaap:OperatingLeaseLiabilityNoncurrent	█▇▇▇▇▇▆▆▆▅▁	1077.456	975.185	941.125	914.701	896.626	889.021	844.269	775.838	747.595	683.672	0.0	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo	█▃▄▁	156.506	140.051	141.815	133.226	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree	█▃▂▁	149.008	137.182	136.289	133.531	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour	█▃▅▁	139.405	128.248	133.866	124.733	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFive		NA	NA	125.79	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive		NA	NA	713.557	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA

		2021-07-01	2021-04-01	2020-12-31	2020-09-24	2020-06-25	2020-03-26	2019-12-26	2019-09-26	2019-06-27	2019-03-28	2018-12-27	2018-09-27	2018-06-28	2018-03-29	2017-12-28	2017-09-28	2017-06-29	2017-03-30	2016-12-29	2016-09-29	2016-06-30	2016-03-31
us-gaap:StockholdersEquity	█▇▇▆▆▆▅▅▅▄▄▄▄▃▃▃▃▁▁	1179.602	1080.72	997.388	931.505	850.496	809.289	764.336	723.04	670.888	619.961	584.309	563.676	534.674	487.597	442.86	388.171	361.144	146.109	134.283	NA	NA	NA
us-gaap:CommonStockValue us-gaap:StatementClassOfStock us-gaap:CommonClassA	████▇▇▇▇▇▆▆▆▆▆▆▆▃▁▁	0.105	0.105	0.104	0.104	0.103	0.102	0.101	0.101	0.099	0.098	0.098	0.097	0.097	0.096	0.096	0.095	0.087	0.077	0.077	NA	NA	NA
us-gaap:AdditionalPaidInCapitalCommonStock	██▇▇▇▇▇▇▆▆▆▆▆▆▆▅▅▁▁	431.549	415.576	408.124	399.489	387.344	378.234	370.413	364.626	353.45	345.907	340.462	337.327	335.024	328.029	323.419	317.213	313.323	118.25	117.27	NA	NA	NA
us-gaap:RetainedEarningsAccumulatedDeficit	█▇▆▆▅▅▅▄▄▃▃▃▃▂▂▂▁▁▁	747.708	664.792	588.996	531.856	463.082	431.078	394.015	358.674	317.7	274.104	243.563	225.661	199.093	159.247	119.55	71.574	48.318	27.882	16.754	NA	NA	NA
us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax	▆▆▆▅▅▄▄▃▃▄▆█▇▆▄▁▂▄▆	0.24	0.247	0.164	0.056	-0.033	-0.125	-0.193	-0.361	-0.361	-0.148	0.186	0.591	0.46	0.225	-0.205	-0.711	-0.59	-0.106	0.176	NA	NA	NA
us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	█▁	5.319	4.734	NA	4.4	4.234	2.908	NA	2.242	2.168	2.25	NA	1.659	1.536	1.415	NA	NA	NA	NA	NA	NA	NA	NA

		2021-07-01	2021-04-01	2020-12-31	2020-09-24	2020-06-25	2020-03-26	2019-12-26	2019-09-26	2019-06-27	2019-03-28	2018-12-27	2018-09-27	2018-06-28	2018-03-29	2017-12-28	2017-09-28	2017-06-29	2017-03-30	2016-12-29	2016-09-29	2016-06-30	2016-03-31
us-gaap:NetCashProvidedByUsedInOperatingActivities	▇▅▇█▄▂▁▅▅▂▃▄▃▃▂▂▂▃▂▂	155.621	100.996	136.479	172.98	72.037	24.668	-4.936	87.437	95.136	27.021	41.925	59.776	43.311	40.612	26.344	16.424	10.365	56.074	18.524	27.651	NA	NA
us-gaap:NetCashProvidedByUsedInInvestingActivities	▁▇▄▇█▇▆▆▇▇▇▇▇█▇█████	-149.569	-45.876	-102.795	-43.659	-27.61	-38.384	-54.993	-62.843	-46.538	-31.634	-42.002	-45.957	-35.597	-27.841	-32.614	-24.141	-25.697	-19.801	-22.408	-21.32	NA	NA
us-gaap:NetCashProvidedByUsedInFinancingActivities	▄▄▄▄▁█▄▄▄▄▄▄▄▄▄▄▄▃▄▄	5.99	-8.841	2.962	7.385	-199.938	276.61	2.86	8.062	2.401	4.42	0.187	-13.832	-7.739	-12.755	6.259	7.898	15.273	-36.279	3.986	-6.365	NA	NA
us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	▄▄▄▆▁█▃▄▄▄▄▄▄▄▄▄	12.042	46.279	36.646	136.706	-155.511	262.894	-57.069	32.656	50.999	-0.193	0.11	-0.013	-0.025	0.016	-0.011	0.181	NA	NA	NA	NA	NA	NA

		2021-07-01	2021-04-01	2020-12-31	2020-09-24	2020-06-25	2020-03-26	2019-12-26	2019-09-26	2019-06-27	2019-03-28	2018-12-27	2018-09-27	2018-06-28	2018-03-29	2017-12-28	2017-09-28	2017-06-29	2017-03-30	2016-12-29	2016-09-29	2016-06-30	2016-03-31
us-gaap:DeferredIncomeTaxExpenseBenefit	▄▄▁▄█▂▃▂▃▃▃▃▃▄▁▄▄▄▁▄▄▃	2.061	4.459	-12.559	1.621	25.291	-4.739	-3.94	-5.166	-0.421	-1.057	-3.573	-0.217	0.711	2.111	-10.132	1.989	2.133	5.453	-10.066	2.984	1.414	0.132
us-gaap:DepreciationDepletionAndAmortization	██▇▆▆▆▆▅▅▅▄▃▃▃▂▂▂▂▂▁▁▁	27.682	26.415	24.391	22.86	22.301	22.088	20.704	18.387	17.726	17.184	14.949	13.411	12.098	11.534	10.425	9.579	9.125	8.933	8.251	6.657	7.571	6.125
us-gaap:IncreaseDecreaseInAccountsPayable	█▃▆▅▄▂▆▅▅▁▇▃▄▄▄▄▅▆▄▄▅▄	118.479	-13.376	55.441	36.425	6.217	-48.644	50.109	45.655	43.197	-84.005	75.718	-27.202	9.98	-3.723	9.484	5.662	37.645	47.473	-7.343	-1.842	18.387	1.943
us-gaap:IncreaseDecreaseInInventories	▇▁▆▃▄▄█▅▄▂▇▂▄▄▅▅▆▄▃▃▄▄	71.689	-46.351	55.539	4.192	5.328	7.076	97.908	37.561	8.892	-33.51	67.242	-28.674	5.727	9.262	32.33	28.147	50.933	22.838	-7.908	2.709	13.959	12.373
us-gaap:NetCashProvidedByUsedInOperatingActivities	▇▅▇█▄▂▁▅▅▂▃▄▃▃▂▂▂▃▂▂	155.621	100.996	136.479	172.98	72.037	24.668	-4.936	87.437	95.136	27.021	41.925	59.776	43.311	40.612	26.344	16.424	10.365	56.074	18.524	27.651	NA	NA
us-gaap:NetIncomeLoss	█▇▆▇▃▄▄▄▄▃▂▃▄▃▅▃▂▂▂▂▁▁	82.916	75.796	57.14	68.774	32.004	37.063	35.341	40.974	43.596	30.72	17.902	26.568	39.846	31.871	47.976	23.255	20.429	11.128	16.707	14.219	5.012	7.101
us-gaap:ShareBasedCompensation	█▇▇▇▆▄▃▃▃▃▃▂▂▂▂▂▂▁▁▁▁▁	5.319	4.734	4.573	4.4	4.234	2.908	2.051	2.242	2.168	2.25	1.903	1.659	1.537	1.415	1.406	1.418	1.25	0.885	1.023	0.746	0.705	0.755

		2021-07-01	2021-04-01	2020-12-31	2020-09-24	2020-06-25	2020-03-26	2019-12-26	2019-09-26	2019-06-27	2019-03-28	2018-12-27	2018-09-27	2018-06-28	2018-03-29	2017-12-28	2017-09-28	2017-06-29	2017-03-30	2016-12-29	2016-09-29	2016-06-30	2016-03-31
us-gaap:NetCashProvidedByUsedInInvestingActivities	▁▇▄▇█▇▆▆▇▇▇▇▇█▇█████	-149.569	-45.876	-102.795	-43.659	-27.61	-38.384	-54.993	-62.843	-46.538	-31.634	-42.002	-45.957	-35.597	-27.841	-32.614	-24.141	-25.697	-19.801	-22.408	-21.32	NA	NA
us-gaap:PaymentsToAcquireProductiveAssets	▇▄█▃▂▃▄▅▄▂▃▄▃▂▂▂▂▁▂▂▁▁	86.215	45.876	102.795	43.659	27.61	38.384	54.993	62.843	46.538	31.634	42.002	45.957	35.597	27.841	32.614	24.141	25.697	19.801	22.408	21.32	17.005	13.915

		2021-07-01	2021-04-01	2020-12-31	2020-09-24	2020-06-25	2020-03-26	2019-12-26	2019-09-26	2019-06-27	2019-03-28	2018-12-27	2018-09-27	2018-06-28	2018-03-29	2017-12-28	2017-09-28	2017-06-29	2017-03-30	2016-12-29	2016-09-29	2016-06-30	2016-03-31
us-gaap:NetCashProvidedByUsedInFinancingActivities	▄▄▄▄▁█▄▄▄▄▄▄▄▄▄▄▄▃▄▄	5.99	-8.841	2.962	7.385	-199.938	276.61	2.86	8.062	2.401	4.42	0.187	-13.832	-7.739	-12.755	6.259	7.898	15.273	-36.279	3.986	-6.365	NA	NA
us-gaap:RepaymentsOfLongTermDebt us-gaap:DebtInstrument fnd:TermLoanFacilityB1		NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA

		2021-07-01	2021-04-01	2020-12-31	2020-09-24	2020-06-25	2020-03-26	2019-12-26	2019-09-26	2019-06-27	2019-03-28	2018-12-27	2018-09-27	2018-06-28	2018-03-29	2017-12-28	2017-09-28	2017-06-29	2017-03-30	2016-12-29	2016-09-29	2016-06-30	2016-03-31

Common Stock Value

us-gaap:CommonStockValue us-gaap:StatementClassOfStock

us-gaap:CommonStockValue

us-gaap:CommonClassA

Period End	2021-07-01	2021-04-01	2020-12-31	2020-09-24	2020-06-25	2020-03-26	2019-12-26	2019-09-26	2019-06-27	2019-03-28	2018-12-27	2018-09-27	2018-06-28	2018-03-29	2017-12-28	2017-09-28	2017-06-29	2017-03-30	2016-12-29
Value	105000.0	105000.0	104000.0	104000.0	103000.0	102000.0	101000.0	101000.0	99000.0	98000.0	98000.0	97000.0	97000.0	96000.0	96000.0	95000.0	87000.0	77000.0	77000.0
Percentage of CommonStockValue	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	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Assets	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0
Percentage of Assets us-gaap:CommonClassA	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0

Common Stock Shares Issued

us-gaap:CommonStockSharesIssued us-gaap:StatementClassOfStock, us-gaap:StatementEquityComponents

us-gaap:CommonStockSharesIssued

us-gaap:CommonClassA, us-gaap:CommonStock

Period End	2021-07-01	2021-04-01	2020-12-31	2020-09-24	2020-06-25	2020-03-26	2019-12-26	2019-09-26	2019-06-27	2019-03-28	2018-12-27	2018-09-27	2018-06-28	2018-03-29	2017-12-28	2016-12-29	2015-12-31	2014-12-25
Value	105	104	104	103	103	102	101	101	99	97	97	97	97	96	95	76	76	76
Percentage of CommonStockSharesIssued	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	100.0	100.0	100.0	100.0	100.0

Weighted Average Number Of Diluted Shares Outstanding

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding

Period End	2021-07-01	2021-04-01	2020-09-24	2020-06-25	2020-03-26	2019-09-26	2019-06-27	2019-03-28	2018-09-27	2018-06-28	2018-03-29	2017-09-28	2017-06-29	2017-03-30	2016-09-29	2016-06-30	2016-03-31
Value	107	107	106	105	105	105	104	104	104	104	104	103	99	0.088645	88	87	0.086669
Percentage of WeightedAverageNumberOfDilutedSharesOutstanding	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	100.0	100.0	100.0	100.0

Weighted Average Number Of Shares Outstanding Basic

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic

Period End	2021-07-01	2021-04-01	2020-09-24	2020-06-25	2020-03-26	2019-09-26	2019-06-27	2019-03-28	2018-09-27	2018-06-28	2018-03-29	2017-09-28	2017-06-29	2017-03-30	2016-09-29	2016-06-30	2016-03-31
Value	104	104	103	102	101	100	98	97	97	96	95	94	90	0.083529	83	83	0.083376
Percentage of WeightedAverageNumberOfSharesOutstandingBasic	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	100.0	100.0	100.0	100.0

Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount

us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecurities

us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount

us-gaap:EmployeeStockOption

Period End	2021-07-01	2021-04-01	2020-09-24	2020-06-25	2020-03-26	2019-09-26	2019-06-27	2019-03-28	2018-09-27	2018-06-28	2018-03-29	2017-09-28	2017-06-29	2017-03-30	2016-09-29	2016-06-30	2016-03-31
Value	67000.0	81000.0	266000.0	591000.0	590000.0	281000.0	1011000.0	986000.0	209000.0	181000.0	98000.0	11664.0	892360.0	2360000.0	1903500.0	1715000.0	2208000.0
Percentage of AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	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	100.0	100.0	100.0	100.0

us-gaap:RestrictedStock

Period End	2021-07-01	2021-04-01	2020-06-25	2020-03-26	2019-06-27
Value	1000.0	18000.0	260000.0	284000.0	0
Percentage of AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	1.5	22.2	44.0	48.1	0.0

us-gaap:RestrictedStockUnitsRSU

Period End	2021-07-01	2021-04-01	2020-06-25	2020-03-26	2019-06-27
Value	6000.0	100000.0	106000.0	108000.0	0
Percentage of AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	9.0	123.5	17.9	18.3	0.0

Earnings Per Share Basic

us-gaap:EarningsPerShareBasic

Period End	2021-07-01	2021-04-01	2020-12-31	2020-09-24	2020-06-25	2020-03-26	2019-12-26	2019-09-26	2019-06-27	2019-03-28	2018-12-27	2018-09-27	2018-06-28	2018-03-29	2017-12-28	2017-09-28	2017-06-29	2017-03-30	2016-12-29	2016-09-29	2016-06-30	2016-03-31
Value	0.79	0.73	0.55	0.67	0.31	0.36	0.35	0.41	0.44	0.31	0.18	0.27	0.41	0.33	0.51	0.25	0.22	0.13	0.2	0.17	0.06	0.09
Percentage of EarningsPerShareBasic	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	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

Earnings Per Share Diluted

us-gaap:EarningsPerShareDiluted

Period End	2021-07-01	2021-04-01	2020-12-31	2020-09-24	2020-06-25	2020-03-26	2019-12-26	2019-09-26	2019-06-27	2019-03-28	2018-12-27	2018-09-27	2018-06-28	2018-03-29	2017-12-28	2017-09-28	2017-06-29	2017-03-30	2016-12-29	2016-09-29	2016-06-30	2016-03-31
Value	0.77	0.71	0.54	0.65	0.3	0.35	0.34	0.39	0.42	0.29	0.17	0.25	0.38	0.3	0.46	0.22	0.2	0.13	0.19	0.16	0.06	0.08
Percentage of EarningsPerShareDiluted	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	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

Allocated Share Based Compensation Expense

us-gaap:AllocatedShareBasedCompensationExpense

Period End	2021-07-01	2021-04-01	2020-12-31	2020-09-24	2020-06-25	2020-03-26	2019-12-26	2019-09-26
Value	5.4	4.7	4.600000000000001	4.4	4.2	2.9	2.0	2.3
Percentage of AllocatedShareBasedCompensationExpense	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	0.6	0.6	0.6	0.6	0.9	0.5	0.4	0.4

Comprehensive Income Net Of Tax

us-gaap:ComprehensiveIncomeNetOfTax

Period End	2021-07-01	2021-04-01	2020-12-31	2020-09-24	2020-06-25	2020-03-26	2019-12-26	2019-09-26	2019-06-27	2019-03-28	2018-12-27	2018-09-27	2018-06-28	2018-03-29	2017-12-28	2017-09-28	2017-06-29	2017-03-30	2016-12-29	2016-09-29	2016-06-30	2016-03-31
Value	82	75	57	68	32	37	35	40	43	30	17	26	40	32	48	23	19	10	16	14	5.035	7.101
Percentage of ComprehensiveIncomeNetOfTax	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	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	9.6	9.7	7.9	10.1	6.9	6.7	6.7	7.9	8.3	6.4	4.0	6.1	9.2	8.0	12.4	6.7	5.8	3.5	6.1	5.3	1.9	3.0

Cost Of Goods And Services Sold

us-gaap:CostOfGoodsAndServicesSold

Period End	2021-07-01	2021-04-01	2020-12-31	2020-09-24	2020-06-25	2020-03-26	2019-12-26	2019-09-26	2019-06-27	2019-03-28	2018-12-27	2018-09-27	2018-06-28	2018-03-29	2017-12-28	2017-09-28	2017-06-29	2017-03-30	2016-12-29	2016-09-29	2016-06-30	2016-03-31
Value	494	445	416	390	265	318	296	307	302	275	255	257	256	237	227	201	201	181	163	160	156	141
Percentage of CostOfGoodsAndServicesSold	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	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	57.5	56.9	57.5	57.0	57.5	57.5	56.4	59.0	58.1	57.8	58.6	59.1	59.1	59.0	58.3	58.6	58.7	59.2	58.8	59.1	58.8	60.1

Cost Of Revenue

us-gaap:CostOfRevenue

Period End	2021-07-01	2021-04-01	2020-12-31	2020-09-24	2020-06-25	2020-03-26	2019-12-26	2019-09-26	2019-06-27	2019-03-28	2018-12-27	2018-09-27	2018-06-28	2018-03-29	2017-12-28	2017-09-28	2017-06-29	2017-03-30	2016-12-29	2016-09-29	2016-06-30	2016-03-31
Value	494	445	416	390	265	318	296	307	302	275	255	257	256	237	227	201	201	181	163	160	156	141
Percentage of CostOfRevenue	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	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	57.5	56.9	57.5	57.0	57.5	57.5	56.4	59.0	58.1	57.8	58.6	59.1	59.1	59.0	58.3	58.6	58.7	59.2	58.8	59.1	58.8	60.1

Gains Losses On Extinguishment Of Debt

us-gaap:GainsLossesOnExtinguishmentOfDebt

Period End	2020-12-31	2020-09-24	2020-06-25	2019-06-27	2018-09-27	2018-06-28	2017-12-28	2017-09-28	2017-06-29	2016-12-29	2016-09-29	2016-06-30
Value	0	0	1015000.0	0	0	0	0	0	-5442000.0	-1660000.0	0	-153000.0
Percentage of GainsLossesOnExtinguishmentOfDebt	0.0	0.0	100.0	0.0	0.0	0.0	0.0	0.0	100.0	100.0	0.0	100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	0.0	0.0	0.2	0.0	0.0	0.0	0.0	0.0	-1.6	-0.6	0.0	-0.1

General And Administrative Expense

us-gaap:GeneralAndAdministrativeExpense

Period End	2021-07-01	2021-04-01	2020-12-31	2020-09-24	2020-06-25	2020-03-26	2019-12-26	2019-09-26	2019-06-27	2019-03-28	2018-12-27	2018-09-27	2018-06-28	2018-03-29	2017-12-28	2017-09-28	2017-06-29	2017-03-30	2016-12-29	2016-09-29	2016-06-30	2016-03-31
Value	52	44	40	39	33	30	34	37	30	30	30	26	25	23	25	22	19	17	17	16	15	14
Percentage of GeneralAndAdministrativeExpense	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	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	6.1	5.6	5.6	5.7	7.3	5.6	6.5	7.1	5.9	6.3	6.9	6.1	5.8	5.8	6.4	6.4	5.7	5.8	6.2	6.1	5.9	6.2

Gross Profit

us-gaap:GrossProfit

Period End	2021-07-01	2021-04-01	2020-12-31	2020-09-24	2020-06-25	2020-03-26	2019-12-26	2019-09-26	2019-06-27	2019-03-28	2018-12-27	2018-09-27	2018-06-28	2018-03-29	2017-12-28	2017-09-28	2017-06-29	2017-03-30	2016-12-29	2016-09-29	2016-06-30	2016-03-31
Value	365	336	307	294	196	236	230	213	217	201	181	178	177	165	162	142	142	125	114	110	109	93
Percentage of GrossProfit	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	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	42.5	43.1	42.5	43.0	42.5	42.5	43.6	41.0	41.9	42.2	41.4	40.9	40.9	41.0	41.7	41.4	41.3	40.8	41.2	40.9	41.2	39.9

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

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest

Period End	2021-07-01	2021-04-01	2020-12-31	2020-09-24	2020-06-25	2020-03-26	2019-12-26	2019-09-26	2019-06-27	2019-03-28	2018-12-27	2018-09-27	2018-06-28	2018-03-29	2017-12-28	2017-09-28	2017-06-29	2017-03-30	2016-12-29	2016-09-29	2016-06-30	2016-03-31
Value	97	94	65	76	19	44	40	29	43	36	20	32	35	34	30	25	25	17	12	22	8.0	11
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	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	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	11.3	12.1	9.1	11.2	4.3	8.1	7.7	5.6	8.4	7.7	4.7	7.4	8.1	8.6	7.7	7.6	7.4	5.6	4.6	8.2	3.0	4.9

Income Tax Expense Benefit

us-gaap:IncomeTaxExpenseBenefit

Period End	2021-07-01	2021-04-01	2020-12-31	2020-09-24	2020-06-25	2020-03-26	2019-12-26	2019-09-26	2019-06-27	2019-03-28	2018-12-27	2018-09-27	2018-06-28	2018-03-29	2017-12-28	2017-09-28	2017-06-29	2017-03-30	2016-12-29	2016-09-29	2016-06-30	2016-03-31
Value	14	18	8.619	8.004	-12.203	7.804	5.104	-11.552	0.076	6.121	2.594	5.498	-4.746	2.851	-17.975	2.731	4.878	6.13	-3.838	7.949	2.988	4.375
Percentage of IncomeTaxExpenseBenefit	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	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	1.7	2.4	1.2	1.2	-2.6	1.4	1.0	-2.2	0.0	1.3	0.6	1.3	-1.1	0.7	-4.6	0.8	1.4	2.0	-1.4	2.9	1.1	1.9

Income Taxes Paid Net

us-gaap:IncomeTaxesPaidNet

Period End	2021-07-01	2021-04-01	2020-12-31	2020-09-24	2019-12-26	2019-09-26	2019-06-27	2019-03-28	2018-12-27	2018-09-27	2018-06-28	2018-03-29	2017-12-28	2017-09-28	2017-06-29	2017-03-30	2016-12-29	2016-09-29
Value	22	13	8.398	4.125	-5.672	0.026	12	0.0	0.36	0.085	0.618	0.019	0.45	2.808	11	0.0	0.241	-0.004
Percentage of IncomeTaxesPaidNet	100.0	100.0	100.0	100.0	100.0	100.0	100.0	0.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	0.0	100.0	100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	2.6	1.7	1.2	0.6	-1.1	0.0	2.3	0.0	0.1	0.0	0.1	0.0	0.1	0.8	3.2	0.0	0.1	-0.0

Interest Expense

us-gaap:InterestExpense

Period End	2021-07-01	2021-04-01	2020-12-31	2020-09-24	2020-06-25	2020-03-26	2019-12-26	2019-09-26	2019-06-27	2019-03-28	2018-12-27	2018-09-27	2018-06-28	2018-03-29	2017-12-28	2017-09-28	2017-06-29	2017-03-30	2016-12-29	2016-09-29	2016-06-30	2016-03-31
Value	1.293	1.388	2.255	2.024	2.303	1.807	1.679	1.978	2.223	2.921	2.817	2.171	2.145	1.784	2.4	2.61	3.353	5.414	5.441	2.401	2.475	2.486
Percentage of InterestExpense	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	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	0.2	0.2	0.3	0.3	0.5	0.3	0.3	0.4	0.4	0.6	0.6	0.5	0.5	0.4	0.6	0.8	1.0	1.8	2.0	0.9	0.9	1.1

Interest Paid Net

us-gaap:InterestPaidNet

Period End	2021-07-01	2021-04-01	2020-12-31	2020-09-24	2020-06-25	2020-03-26	2019-12-26	2019-09-26	2019-06-27	2019-03-28	2018-12-27	2018-09-27	2018-06-28	2018-03-29	2017-12-28	2017-09-28	2017-06-29	2017-03-30	2016-12-29	2016-09-29
Value	-0.036	1.376	3.146	1.411	2.188	1.298	1.662	1.814	1.925	1.987	1.831	1.888	1.476	2.368	2.006	2.06	3.737	7.945	2.066	0.662
Percentage of InterestPaidNet	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	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	-0.0	0.2	0.4	0.2	0.5	0.2	0.3	0.3	0.4	0.4	0.4	0.4	0.3	0.6	0.5	0.6	1.1	2.6	0.7	0.2

Net Income Loss

us-gaap:NetIncomeLoss

Period End	2021-07-01	2021-04-01	2020-12-31	2020-09-24	2020-06-25	2020-03-26	2019-12-26	2019-09-26	2019-06-27	2019-03-28	2018-12-27	2018-09-27	2018-06-28	2018-03-29	2017-12-28	2017-09-28	2017-06-29	2017-03-30	2016-12-29	2016-09-29	2016-06-30	2016-03-31
Value	82	75	57	68	32	37	35	40	43	30	17	26	39	31	47	23	20	11	16	14	5.012	7.101
Percentage of NetIncomeLoss	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	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	9.6	9.7	7.9	10.0	6.9	6.7	6.7	7.9	8.4	6.4	4.1	6.1	9.2	7.9	12.3	6.8	5.9	3.6	6.0	5.2	1.9	3.0

us-gaap:NetIncomeLoss us-gaap:StatementEquityComponents

us-gaap:RetainedEarnings

Period End	2021-07-01	2021-04-01	2020-09-24	2020-06-25	2020-03-26	2019-09-26	2019-06-27	2019-03-28	2018-09-27	2018-06-28	2018-03-29
Value	82	75	68	32	37	40	43	30	26	39	31
Percentage of NetIncomeLoss	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	9.6	9.7	10.0	6.9	6.7	7.9	8.4	6.4	6.1	9.2	7.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:RetainedEarnings	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0

Operating Expenses

us-gaap:OperatingExpenses

Period End	2021-07-01	2021-04-01	2020-12-31	2020-09-24	2020-06-25	2020-03-26	2019-12-26	2019-09-26	2019-06-27	2019-03-28	2018-12-27	2018-09-27	2018-06-28	2018-03-29	2017-12-28	2017-09-28	2017-06-29	2017-03-30	2016-12-29	2016-09-29	2016-06-30	2016-03-31
Value	266	240	239	215	175	189	187	182	171	161	157	143	140	128	129	113	108	102	94	86	99	79
Percentage of OperatingExpenses	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	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	31.0	30.8	33.1	31.5	38.0	34.1	35.7	35.0	33.0	33.9	36.1	33.0	32.3	32.0	33.4	33.1	31.4	33.5	34.1	31.8	37.2	34.0

Operating Income Loss

us-gaap:OperatingIncomeLoss

Period End	2021-07-01	2021-04-01	2020-12-31	2020-09-24	2020-06-25	2020-03-26	2019-12-26	2019-09-26	2019-06-27	2019-03-28	2018-12-27	2018-09-27	2018-06-28	2018-03-29	2017-12-28	2017-09-28	2017-06-29	2017-03-30	2016-12-29	2016-09-29	2016-06-30	2016-03-31
Value	98	95	68	78	21	46	42	31	45	39	23	34	37	36	32	28	34	22	19	24	10	13
Percentage of OperatingIncomeLoss	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	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	11.5	12.3	9.4	11.5	4.6	8.4	8.0	6.0	8.8	8.3	5.3	7.9	8.6	9.1	8.3	8.3	9.9	7.4	7.2	9.1	4.0	5.9

Revenue From Contract With Customer Excluding Assessed Tax

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax

Period End	2021-07-01	2021-04-01	2020-12-31	2020-09-24	2020-06-25	2020-03-26	2019-12-26	2019-09-26	2019-06-27	2019-03-28	2018-12-27	2018-09-27	2018-06-28	2018-03-29	2017-12-28	2017-09-28	2017-06-29	2017-03-30	2016-12-29	2016-09-29	2016-06-30	2016-03-31
Value	860	782	723	684	462	554	527	521	520	477	436	435	434	402	389	343	344	307	278	271	265	235
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	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	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	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	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ConcentrationRiskByBenchmark, us-gaap:ConcentrationRiskByType

us-gaap:RevenueFromContractWithCustomerProductAndServiceBenchmark, us-gaap:ProductConcentrationRisk

Period End	2020-09-24	2020-06-25	2020-03-26	2019-09-26	2019-06-27	2019-03-28	2018-09-27	2018-06-28
Value	684	462	554	521	520	477	435	434
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:RevenueFromContractWithCustomerProductAndServiceBenchmark us-gaap:ProductConcentrationRisk	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ProductOrService

fnd:AdjacentCategories

Period End	2021-07-01	2021-04-01	2020-06-25	2020-03-26
Value	13	12	3.315	2.55
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	1.6	1.6	0.7	0.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	1.6	1.6	0.7	0.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax fnd:AdjacentCategories	100.0	100.0	100.0	100.0

fnd:DecorativeAccessories

Period End	2021-07-01	2021-04-01	2020-06-25	2020-03-26	2019-06-27	2019-03-28	2018-12-27	2018-09-27	2018-06-28	2018-03-29	2017-12-28	2017-09-28	2017-06-29	2017-03-30
Value	163	157	84	111	97	94	80	82	82	78	74	57	64	60
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	19.1	20.1	18.2	20.0	18.8	19.8	18.5	19.0	19.1	19.5	19.2	16.8	18.9	19.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	19.1	20.1	18.2	20.0	18.8	19.8	18.5	19.0	19.1	19.5	19.2	16.8	18.9	19.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax fnd:DecorativeAccessories	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	100.0

fnd:InstallationMaterialsAndTools

Period End	2021-07-01	2021-04-01	2020-06-25	2020-03-26	2019-06-27	2019-03-28	2018-06-28	2018-03-29
Value	141	130	73	94	88	79	68	63
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	16.4	16.7	15.8	17.0	17.0	16.7	15.7	15.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	16.4	16.7	15.8	17.0	17.0	16.7	15.7	15.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax fnd:InstallationMaterialsAndTools	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

fnd:LaminateLuxuryVinylPlank

Period End	2021-07-01	2021-04-01	2020-06-25	2020-03-26	2019-06-27	2019-03-28	2018-12-27	2018-09-27	2018-06-28	2018-03-29	2017-09-28	2017-06-29	2017-03-30
Value	214	186	105	124	108	97	88	83	77	66	52	50	42
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	25.0	23.8	22.8	22.5	20.8	20.4	20.2	19.2	17.8	16.6	15.3	14.8	13.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	25.0	23.8	22.8	22.5	20.8	20.4	20.2	19.2	17.8	16.6	15.3	14.8	13.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax fnd:LaminateLuxuryVinylPlank	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

fnd:NaturalStone

Period End	2021-07-01	2021-04-01	2020-06-25	2020-03-26	2019-06-27	2019-03-28	2018-12-27	2018-09-27	2018-06-28	2018-03-29	2017-12-28	2017-09-28	2017-06-29	2017-03-30
Value	51	49	30	34	32	30	28	28	29	28	27	25	26	24
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	6.0	6.3	6.6	6.3	6.3	6.5	6.4	6.4	6.8	7.0	7.2	7.4	7.8	8.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	6.0	6.3	6.6	6.3	6.3	6.5	6.4	6.4	6.8	7.0	7.2	7.4	7.8	8.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax fnd:NaturalStone	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	100.0

fnd:Tile

Period End	2021-07-01	2021-04-01	2020-06-25	2020-03-26	2019-06-27	2019-03-28	2018-12-27	2018-09-27	2018-06-28	2018-03-29	2017-12-28	2017-09-28	2017-06-29	2017-03-30
Value	208	189	118	134	136	125	115	119	123	117	120	103	103	92
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	24.2	24.2	25.7	24.3	26.2	26.3	26.5	27.5	28.4	29.1	30.8	30.0	30.2	30.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	24.2	24.2	25.7	24.3	26.2	26.3	26.5	27.5	28.4	29.1	30.8	30.0	30.2	30.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax fnd:Tile	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	100.0

fnd:WoodFlooring

Period End	2021-07-01	2021-04-01	2020-06-25	2020-03-26
Value	66	62	41	48
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	7.7	7.9	9.1	8.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	7.7	7.9	9.1	8.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax fnd:WoodFlooring	100.0	100.0	100.0	100.0

us-gaap:ProductAndServiceOther

Period End	2021-07-01	2021-04-01	2020-06-25	2020-03-26
Value	0.034	-4.527	4.964	2.986
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	0.0	-0.6	1.1	0.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	0.0	-0.6	1.1	0.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ProductAndServiceOther	100.0	100.0	100.0	100.0

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ProductOrService, us-gaap:ConcentrationRiskByBenchmark, us-gaap:ConcentrationRiskByType

fnd:DecorativeAccessories, us-gaap:RevenueFromContractWithCustomerProductAndServiceBenchmark, us-gaap:ProductConcentrationRisk

Period End	2020-09-24	2020-06-25	2020-03-26	2019-09-26	2019-06-27	2019-03-28	2018-09-27	2018-06-28
Value	135	87	113	100	97	94	82	82
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	19.8	18.9	20.5	19.3	18.8	19.8	19.0	19.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	19.8	18.9	20.5	19.3	18.8	19.8	19.0	19.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax fnd:DecorativeAccessories us-gaap:RevenueFromContractWithCustomerProductAndServiceBenchmark us-gaap:ProductConcentrationRisk	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

fnd:InstallationMaterialsAndTools, us-gaap:RevenueFromContractWithCustomerProductAndServiceBenchmark, us-gaap:ProductConcentrationRisk

Period End	2020-09-24	2020-06-25	2020-03-26	2019-09-26	2019-06-27	2019-03-28	2018-09-27	2018-06-28
Value	113	73	94	88	88	79	69	68
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	16.5	15.8	17.0	16.9	17.0	16.7	15.9	15.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	16.5	15.8	17.0	16.9	17.0	16.7	15.9	15.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax fnd:InstallationMaterialsAndTools us-gaap:RevenueFromContractWithCustomerProductAndServiceBenchmark us-gaap:ProductConcentrationRisk	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

fnd:LaminateLuxuryVinylPlank, us-gaap:RevenueFromContractWithCustomerProductAndServiceBenchmark, us-gaap:ProductConcentrationRisk

Period End	2020-09-24	2020-06-25	2020-03-26	2019-09-26	2019-06-27	2019-03-28	2018-09-27	2018-06-28
Value	157	105	124	116	108	97	83	77
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	23.0	22.8	22.5	22.3	20.8	20.4	19.2	17.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	23.0	22.8	22.5	22.3	20.8	20.4	19.2	17.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax fnd:LaminateLuxuryVinylPlank us-gaap:RevenueFromContractWithCustomerProductAndServiceBenchmark us-gaap:ProductConcentrationRisk	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

fnd:NaturalStone, us-gaap:RevenueFromContractWithCustomerProductAndServiceBenchmark, us-gaap:ProductConcentrationRisk

Period End	2020-09-24	2020-06-25	2020-03-26	2019-09-26	2019-06-27	2019-03-28	2018-09-27	2018-06-28
Value	41	30	34	31	32	30	28	29
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	6.1	6.6	6.3	6.0	6.3	6.5	6.4	6.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	6.1	6.6	6.3	6.0	6.3	6.5	6.4	6.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax fnd:NaturalStone us-gaap:RevenueFromContractWithCustomerProductAndServiceBenchmark us-gaap:ProductConcentrationRisk	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

fnd:Tile, us-gaap:RevenueFromContractWithCustomerProductAndServiceBenchmark, us-gaap:ProductConcentrationRisk

Period End	2020-09-24	2020-06-25	2020-03-26	2019-09-26	2019-06-27	2019-03-28	2018-09-27	2018-06-28
Value	173	118	134	133	136	125	119	123
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	25.3	25.7	24.3	25.6	26.2	26.3	27.5	28.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	25.3	25.7	24.3	25.6	26.2	26.3	27.5	28.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax fnd:Tile us-gaap:RevenueFromContractWithCustomerProductAndServiceBenchmark us-gaap:ProductConcentrationRisk	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

fnd:WoodFlooring, us-gaap:RevenueFromContractWithCustomerProductAndServiceBenchmark, us-gaap:ProductConcentrationRisk

Period End	2020-09-24	2020-06-25	2020-03-26	2019-09-26	2019-06-27	2019-03-28
Value	60	41	48	51	52	49
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	8.8	9.1	8.8	9.9	10.1	10.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	8.8	9.1	8.8	9.9	10.1	10.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax fnd:WoodFlooring us-gaap:RevenueFromContractWithCustomerProductAndServiceBenchmark us-gaap:ProductConcentrationRisk	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:ProductAndServiceOther, us-gaap:RevenueFromContractWithCustomerProductAndServiceBenchmark, us-gaap:ProductConcentrationRisk

Period End	2020-09-24	2020-06-25	2020-03-26	2019-09-26	2019-06-27	2019-03-28
Value	2.289	4.964	2.986	-0.156	3.923	-0.028
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	0.3	1.1	0.5	-0.0	0.8	-0.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	0.3	1.1	0.5	-0.0	0.8	-0.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ProductAndServiceOther us-gaap:RevenueFromContractWithCustomerProductAndServiceBenchmark us-gaap:ProductConcentrationRisk	100.0	100.0	100.0	100.0	100.0	100.0

Assets

us-gaap:Assets

Period End	2021-07-01	2021-04-01	2020-12-31	2020-09-24	2020-06-25	2020-03-26	2019-12-26	2019-09-26	2019-06-27	2019-03-28	2018-12-27	2018-09-27	2018-06-28	2018-03-29	2017-12-28	2017-09-28	2017-06-29	2017-03-30	2016-12-29
Value	3364	2964	2880	2714	2528	2633	2324	2156	2011	1873	1234	1131	1118	1075	1067	1000	944	868	831
Percentage of Assets	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	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Assets	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	100.0	100.0	100.0	100.0	100.0	100.0

Liabilities

us-gaap:Liabilities

Period End	2021-07-01	2021-04-01	2020-12-31	2020-09-24	2020-06-25	2020-03-26	2019-12-26	2019-09-26	2019-06-27	2019-03-28	2018-12-27	2018-09-27	2018-06-28	2018-03-29	2017-12-28	2017-09-28	2017-06-29	2017-03-30	2016-12-29
Value	2184	1884	1883	1782	1678	1824	1559	1433	1340	1253	649	568	583	588	625	612	583	722	696
Percentage of Liabilities	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	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Assets	64.9	63.5	65.4	65.7	66.4	69.3	67.1	66.5	66.6	66.9	52.7	50.2	52.2	54.7	58.5	61.2	61.8	83.2	83.8

Liabilities And Stockholders Equity

us-gaap:LiabilitiesAndStockholdersEquity

Period End	2021-07-01	2021-04-01	2020-12-31	2020-09-24	2020-06-25	2020-03-26	2019-12-26	2019-09-26	2019-06-27	2019-03-28	2018-12-27	2018-09-27	2018-06-28	2018-03-29	2017-12-28	2017-09-28	2017-06-29	2017-03-30	2016-12-29
Value	3364	2964	2880	2714	2528	2633	2324	2156	2011	1873	1234	1131	1118	1075	1067	1000	944	868	831
Percentage of LiabilitiesAndStockholdersEquity	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	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Assets	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	100.0	100.0	100.0	100.0	100.0	100.0

Stockholders Equity

us-gaap:StockholdersEquity

Period End	2021-07-01	2021-04-01	2020-12-31	2020-09-24	2020-06-25	2020-03-26	2019-12-26	2019-09-26	2019-06-27	2019-03-28	2018-12-27	2018-09-27	2018-06-28	2018-03-29	2017-12-28	2017-09-28	2017-06-29	2017-03-30	2016-12-29	2015-12-31	2014-12-25
Value	1179	1080	997	931	850	809	764	723	670	619	584	563	534	487	442	388	361	146	134	312	282
Percentage of StockholdersEquity	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	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Assets	35.1	36.5	34.6	34.3	33.6	30.7	32.9	33.5	33.4	33.1	47.3	49.8	47.8	45.3	41.5	38.8	38.2	16.8	16.2	0.0	0.0

us-gaap:StockholdersEquity us-gaap:StatementClassOfStock, us-gaap:StatementEquityComponents

us-gaap:CommonClassA, us-gaap:CommonStock

Period End	2021-07-01	2021-04-01	2020-12-31	2020-09-24	2020-06-25	2020-03-26	2019-12-26	2019-09-26	2019-06-27	2019-03-28	2018-12-27	2018-09-27	2018-06-28	2018-03-29	2017-12-28	2016-12-29	2015-12-31	2014-12-25
Value	0.105	0.105	0.104	0.104	0.103	0.102	0.101	0.101	0.099	0.098	0.098	0.097	0.097	0.096	0.096	0.077	0.077	0.077
Percentage of StockholdersEquity	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.1	0.0	0.0
Percentage of Assets	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0
Percentage of Assets us-gaap:CommonClassA us-gaap:CommonStock	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0

us-gaap:StockholdersEquity us-gaap:StatementEquityComponents

us-gaap:AccumulatedOtherComprehensiveIncome

Period End	2021-07-01	2021-04-01	2020-12-31	2020-09-24	2020-06-25	2020-03-26	2019-12-26	2019-09-26	2019-06-27	2019-03-28	2018-12-27	2018-09-27	2018-06-28	2018-03-29	2017-12-28	2016-12-29	2015-12-31	2014-12-25
Value	0.24	0.247	0.164	0.056	-0.033	-0.125	-0.193	-0.361	-0.361	-0.148	0.186	0.591	0.46	0.225	-0.205	0.176	-0.1	-0.143
Percentage of StockholdersEquity	0.0	0.0	0.0	0.0	-0.0	-0.0	-0.0	-0.0	-0.1	-0.0	0.0	0.1	0.1	0.0	-0.0	0.1	-0.0	-0.1
Percentage of Assets	0.0	0.0	0.0	0.0	-0.0	-0.0	-0.0	-0.0	-0.0	-0.0	0.0	0.1	0.0	0.0	-0.0	0.0	0.0	0.0
Percentage of Assets us-gaap:AccumulatedOtherComprehensiveIncome	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0

us-gaap:AdditionalPaidInCapital

Period End	2021-07-01	2021-04-01	2020-12-31	2020-09-24	2020-06-25	2020-03-26	2019-12-26	2019-09-26	2019-06-27	2019-03-28	2018-12-27	2018-09-27	2018-06-28	2018-03-29	2017-12-28	2016-12-29	2015-12-31	2014-12-25
Value	431	415	408	399	387	378	370	364	353	345	340	337	335	328	323	117	264	261
Percentage of StockholdersEquity	36.6	38.5	40.9	42.9	45.5	46.7	48.5	50.4	52.7	55.8	58.3	59.8	62.7	67.3	73.0	87.3	84.6	92.5
Percentage of Assets	12.8	14.0	14.2	14.7	15.3	14.4	15.9	16.9	17.6	18.5	27.6	29.8	30.0	30.5	30.3	14.1	0.0	0.0
Percentage of Assets us-gaap:AdditionalPaidInCapital	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0

us-gaap:RetainedEarnings

Period End	2021-07-01	2021-04-01	2020-12-31	2020-09-24	2020-06-25	2020-03-26	2019-12-26	2019-09-26	2019-06-27	2019-03-28	2018-12-27	2018-09-27	2018-06-28	2018-03-29	2017-12-28	2016-12-29	2015-12-31	2014-12-25
Value	747	664	588	531	463	431	394	358	317	274	243	225	199	159	119	16	48	21
Percentage of StockholdersEquity	63.4	61.5	59.1	57.1	54.4	53.3	51.5	49.6	47.4	44.2	41.7	40.0	37.2	32.7	27.0	12.5	15.4	7.5
Percentage of Assets	22.2	22.4	20.4	19.6	18.3	16.4	17.0	16.6	15.8	14.6	19.7	19.9	17.8	14.8	11.2	2.0	0.0	0.0
Percentage of Assets us-gaap:RetainedEarnings	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0

Assets Current

us-gaap:AssetsCurrent

Period End	2021-07-01	2021-04-01	2020-12-31	2020-09-24	2020-06-25	2020-03-26	2019-12-26	2019-09-26	2019-06-27	2019-03-28	2018-12-27	2018-09-27	2018-06-28	2018-03-29	2017-12-28	2017-09-28	2017-06-29	2017-03-30	2016-12-29
Value	1165	1061	1040	973	829	950	701	643	564	527	559	486	502	486	503	456	416	359	336
Percentage of AssetsCurrent	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	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Assets	34.6	35.8	36.1	35.9	32.8	36.1	30.2	29.8	28.0	28.2	45.3	43.0	44.9	45.2	47.1	45.6	44.1	41.4	40.5

Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents

Period End	2021-07-01	2021-04-01	2020-12-31	2020-09-24	2020-06-25	2020-03-26	2019-12-26	2019-09-26	2019-06-27	2019-03-28	2018-12-27	2018-09-27	2018-06-28	2018-03-29	2017-12-28	2017-09-28	2017-06-29	2016-12-29	2015-12-31
Value	366	354	307	271	134	289	27	84	51	0.451	0.644	0.534	0.547	0.572	0.556	0.567	0.386	0.451	0.318
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	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	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Assets	10.9	11.9	10.7	10.0	5.3	11.0	1.2	3.9	2.6	0.0	0.1	0.0	0.0	0.1	0.1	0.1	0.0	0.1	0.0

Inventory Net

us-gaap:InventoryNet

Period End	2021-07-01	2021-04-01	2020-12-31	2020-09-24	2020-06-25	2020-03-26	2019-12-26	2019-09-26	2019-06-27	2019-03-28	2018-12-27	2018-09-27	2018-06-28	2018-03-29	2017-12-28	2017-09-28	2017-06-29	2017-03-30	2016-12-29
Value	683	607	654	598	594	588	581	483	446	437	471	403	432	426	427	395	367	316	293
Percentage of InventoryNet	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	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Assets	20.3	20.5	22.7	22.0	23.5	22.4	25.0	22.4	22.2	23.4	38.2	35.7	38.7	39.7	40.1	39.5	38.9	36.5	35.3

Prepaid Expense And Other Assets Current

us-gaap:PrepaidExpenseAndOtherAssetsCurrent

Period End	2021-07-01	2021-04-01	2020-12-31	2020-09-24	2020-06-25	2020-03-26	2019-12-26	2019-09-26	2019-06-27	2019-03-28	2018-12-27	2018-09-27	2018-06-28	2018-03-29	2017-12-28	2017-09-28	2017-06-29	2017-03-30	2016-12-29
Value	42	40	28	23	19	21	20	21	27	23	15	16	12	11	8.193	7.525	7.648	9.517	7.529
Percentage of PrepaidExpenseAndOtherAssetsCurrent	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	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Assets	1.3	1.4	1.0	0.9	0.8	0.8	0.9	1.0	1.4	1.2	1.3	1.5	1.1	1.0	0.8	0.8	0.8	1.1	0.9

Assets Noncurrent

us-gaap:AssetsNoncurrent

Period End	2021-07-01	2021-04-01	2020-12-31	2020-09-24	2020-06-25	2020-03-26	2019-12-26	2019-09-26	2019-06-27	2019-03-28	2018-12-27	2018-09-27	2018-06-28	2018-03-29	2017-12-28	2017-09-28	2017-06-29	2017-03-30	2016-12-29
Value	2198	1902	1839	1740	1698	1682	1622	1513	1447	1345	674	645	616	589	564	544	528	508	494
Percentage of AssetsNoncurrent	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	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Assets	65.4	64.2	63.9	64.1	67.2	63.9	69.8	70.2	72.0	71.8	54.7	57.0	55.1	54.8	52.9	54.4	55.9	58.6	59.5

Property Plant And Equipment Gross

us-gaap:PropertyPlantAndEquipmentGross

Period End	2020-12-31	2019-12-26	2018-12-27	2017-12-28	2016-12-29
Value	874	680	480	325	220
Percentage of PropertyPlantAndEquipmentGross	100.0	100.0	100.0	100.0	100.0
Percentage of Assets	30.4	29.3	38.9	30.5	26.6

us-gaap:PropertyPlantAndEquipmentGross us-gaap:PropertyPlantAndEquipmentByType

fnd:ComputerSoftwareAndHardware

Period End	2020-12-31	2019-12-26	2018-12-27	2017-12-28	2016-12-29
Value	138	113	83	52	40
Percentage of PropertyPlantAndEquipmentGross	15.8	16.7	17.4	16.2	18.4
Percentage of Assets	4.8	4.9	6.8	4.9	4.9
Percentage of Assets fnd:ComputerSoftwareAndHardware	0.0	0.0	0.0	0.0	0.0

us-gaap:BuildingAndBuildingImprovements

Period End	2020-12-31	2019-12-26
Value	65	11
Percentage of PropertyPlantAndEquipmentGross	7.5	1.7
Percentage of Assets	2.3	0.5
Percentage of Assets us-gaap:BuildingAndBuildingImprovements	0.0	0.0

us-gaap:FurnitureAndFixtures

Period End	2020-12-31	2019-12-26	2018-12-27	2017-12-28	2016-12-29
Value	259	236	174	126	90
Percentage of PropertyPlantAndEquipmentGross	29.7	34.8	36.4	38.9	41.1
Percentage of Assets	9.0	10.2	14.2	11.9	10.9
Percentage of Assets us-gaap:FurnitureAndFixtures	0.0	0.0	0.0	0.0	0.0

us-gaap:Land

Period End	2020-12-31	2019-12-26	2018-12-27	2017-12-28
Value	30	8.715	5.297	4.976
Percentage of PropertyPlantAndEquipmentGross	3.5	1.3	1.1	1.5
Percentage of Assets	1.1	0.4	0.4	0.5
Percentage of Assets us-gaap:Land	0.0	0.0	0.0	0.0

us-gaap:LeaseholdImprovements

Period End	2020-12-31	2019-12-26	2018-12-27	2017-12-28	2016-12-29
Value	380	321	216	141	89
Percentage of PropertyPlantAndEquipmentGross	43.5	47.2	45.1	43.4	40.4
Percentage of Assets	13.2	13.8	17.5	13.2	10.7
Percentage of Assets us-gaap:LeaseholdImprovements	0.0	0.0	0.0	0.0	0.0

Accumulated Depreciation Depletion And Amortization Property Plant And Equipment

us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment

Period End	2020-12-31	2019-12-26	2018-12-27	2017-12-28	2016-12-29
Value	295	224	151	104	70
Percentage of AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	100.0	100.0	100.0	100.0	100.0
Percentage of Assets	10.3	9.6	12.3	9.8	8.5

Property Plant And Equipment Net

us-gaap:PropertyPlantAndEquipmentNet

Period End	2021-07-01	2021-04-01	2020-12-31	2020-09-24	2020-06-25	2020-03-26	2019-12-26	2019-09-26	2019-06-27	2019-03-28	2018-12-27	2018-09-27	2018-06-28	2018-03-29	2017-12-28	2017-09-28	2017-06-29	2017-03-30	2016-12-29
Value	727	611	579	506	481	473	456	425	382	338	328	300	271	245	220	200	183	163	150
Percentage of PropertyPlantAndEquipmentNet	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	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Assets	21.6	20.6	20.1	18.7	19.1	18.0	19.6	19.7	19.0	18.1	26.6	26.5	24.3	22.8	20.7	20.0	19.4	18.9	18.1

Goodwill

us-gaap:Goodwill

Period End	2021-07-01	2021-04-01	2020-12-31	2020-09-24	2020-06-25	2020-03-26	2019-12-26	2019-09-26	2019-06-27	2019-03-28	2018-12-27	2018-09-27	2018-06-28	2018-03-29	2017-12-28	2017-09-28	2017-06-29	2017-03-30	2016-12-29
Value	255	227	227	227	227	227	227	227	227	227	227	227	227	227	227	227	227	227	227
Percentage of Goodwill	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	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Assets	7.6	7.7	7.9	8.4	9.0	8.6	9.8	10.5	11.3	12.1	18.4	20.1	20.3	21.1	21.3	22.7	24.1	26.2	27.4

us-gaap:Goodwill us-gaap:BusinessAcquisition

fnd:SpartanSurfacesInc

Period End	2021-06-04
Value	28
Percentage of Goodwill	0.0
Percentage of Assets	0.0
Percentage of Assets fnd:SpartanSurfacesInc	0.0

Intangible Assets Net Excluding Goodwill

us-gaap:IntangibleAssetsNetExcludingGoodwill

Period End	2021-07-01	2021-04-01	2020-12-31	2020-09-24	2020-06-25	2020-03-26	2019-12-26	2019-09-26	2019-06-27	2019-03-28	2018-12-27	2018-09-27	2018-06-28	2018-03-29	2017-12-28	2017-09-28	2017-06-29	2017-03-30	2016-12-29
Value	153	109	109	109	109	109	109	109	109	109	109	109	109	109	109	109	109	109	109
Percentage of IntangibleAssetsNetExcludingGoodwill	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	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Assets	4.6	3.7	3.8	4.0	4.3	4.1	4.7	5.1	5.4	5.8	8.9	9.7	9.8	10.2	10.2	10.9	11.6	12.6	13.2

Operating Lease Right Of Use Asset

us-gaap:OperatingLeaseRightOfUseAsset

Period End	2021-07-01	2021-04-01	2020-12-31	2020-09-24	2020-06-25	2020-03-26	2019-12-26	2019-09-26	2019-06-27	2019-03-28	2018-12-27
Value	1055	947	916	890	873	865	822	743	720	659	0.0
Percentage of OperatingLeaseRightOfUseAsset	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	0.0
Percentage of Assets	31.4	32.0	31.8	32.8	34.5	32.9	35.4	34.5	35.8	35.2	0.0

us-gaap:OperatingLeaseRightOfUseAsset us-gaap:PropertyPlantAndEquipmentByType

us-gaap:Building

Period End	2020-12-31	2019-12-26	2019-09-26	2019-06-27	2019-03-28
Value	851	808	732	707	647
Percentage of OperatingLeaseRightOfUseAsset	92.9	98.4	98.5	98.3	98.3
Percentage of Assets	29.5	34.8	34.0	35.2	34.6
Percentage of Assets us-gaap:Building	0.0	0.0	0.0	0.0	0.0

us-gaap:Equipment

Period End	2020-12-31	2019-12-26	2019-09-26	2019-06-27	2019-03-28
Value	6.865	7.322	6.947	7.448	6.263
Percentage of OperatingLeaseRightOfUseAsset	0.7	0.9	0.9	1.0	1.0
Percentage of Assets	0.2	0.3	0.3	0.4	0.3
Percentage of Assets us-gaap:Equipment	0.0	0.0	0.0	0.0	0.0

us-gaap:Land

Period End	2020-12-31	2019-12-26	2019-09-26	2019-06-27	2019-03-28
Value	56	2.378	0.194	0.219	0.245
Percentage of OperatingLeaseRightOfUseAsset	6.2	0.3	0.0	0.0	0.0
Percentage of Assets	2.0	0.1	0.0	0.0	0.0
Percentage of Assets us-gaap:Land	0.0	0.0	0.0	0.0	0.0

us-gaap:SoftwareAndSoftwareDevelopmentCosts

Period End	2020-12-31	2019-12-26	2019-09-26	2019-06-27	2019-03-28
Value	1.66	3.567	4.031	4.487	4.94
Percentage of OperatingLeaseRightOfUseAsset	0.2	0.4	0.5	0.6	0.7
Percentage of Assets	0.1	0.2	0.2	0.2	0.3
Percentage of Assets us-gaap:SoftwareAndSoftwareDevelopmentCosts	0.0	0.0	0.0	0.0	0.0

Other Assets Noncurrent

us-gaap:OtherAssetsNoncurrent

Period End	2021-07-01	2021-04-01	2020-12-31	2020-09-24	2020-06-25	2020-03-26	2019-12-26	2019-09-26	2019-06-27	2019-03-28	2018-12-27	2018-09-27	2018-06-28	2018-03-29	2017-12-28	2017-09-28	2017-06-29	2017-03-30	2016-12-29
Value	7.605	7.37	7.569	6.768	7.134	7.551	7.532	7.395	7.693	11	9.49	8.043	7.808	7.256	7.019	7.407	7.658	7.823	7.639
Percentage of OtherAssetsNoncurrent	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	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Assets	0.2	0.2	0.3	0.2	0.3	0.3	0.3	0.3	0.4	0.6	0.8	0.7	0.7	0.7	0.7	0.7	0.8	0.9	0.9

Accounts Payable Current

us-gaap:AccountsPayableCurrent

Period End	2021-07-01	2021-04-01	2020-12-31	2020-09-24	2020-06-25	2020-03-26	2019-12-26	2019-09-26	2019-06-27	2019-03-28	2018-12-27	2018-09-27	2018-06-28	2018-03-29	2017-12-28	2017-09-28	2017-06-29	2017-03-30	2016-12-29
Value	529	402	417	362	326	319	368	318	272	229	313	237	264	255	258	249	243	205	158
Percentage of AccountsPayableCurrent	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	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Assets	15.7	13.6	14.5	13.4	12.9	12.1	15.9	14.8	13.6	12.3	25.4	21.0	23.7	23.7	24.2	24.9	25.8	23.7	19.1

Accrued Income Taxes Current

us-gaap:AccruedIncomeTaxesCurrent

Period End	2021-07-01	2021-04-01	2020-12-31	2020-03-26	2019-12-26	2019-03-28	2018-12-27	2017-09-28	2017-06-29	2017-03-30	2016-12-29
Value	3.85	13	12	9.674	0.0	8.765	0.0	0.0	0.0	6.486	5.787
Percentage of AccruedIncomeTaxesCurrent	100.0	100.0	100.0	100.0	0.0	100.0	0.0	0.0	0.0	100.0	100.0
Percentage of Assets	0.1	0.5	0.4	0.4	0.0	0.5	0.0	0.0	0.0	0.7	0.7

Accrued Liabilities Current

us-gaap:AccruedLiabilitiesCurrent

Period End	2021-07-01	2021-04-01	2020-12-31	2020-09-24	2020-06-25	2020-03-26	2019-12-26	2019-09-26	2019-06-27	2019-03-28	2018-12-27	2018-09-27	2018-06-28	2018-03-29	2017-12-28	2017-09-28	2017-06-29	2017-03-30	2016-12-29
Value	212	160	162	150	106	100	102	112	97	76	82	77	62	68	74	65	53	56	61
Percentage of AccruedLiabilitiesCurrent	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	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Assets	6.3	5.4	5.6	5.5	4.2	3.8	4.4	5.2	4.8	4.1	6.6	6.9	5.6	6.4	7.0	6.6	5.7	6.5	7.4

Contract With Customer Liability Current

us-gaap:ContractWithCustomerLiabilityCurrent

Period End	2021-07-01	2021-04-01	2020-12-31	2020-09-24	2020-06-25	2020-03-26	2019-12-26	2019-09-26	2019-06-27	2019-03-28	2018-12-27	2018-09-27	2018-06-28	2018-03-29	2017-12-28
Value	23	15	10	10	8.387	7.189	6.683	8.824	6.967	6.581	5.244	5.047	4.683	3.742	22
Percentage of ContractWithCustomerLiabilityCurrent	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	100.0	100.0
Percentage of Assets	0.7	0.5	0.4	0.4	0.3	0.3	0.3	0.4	0.3	0.4	0.4	0.4	0.4	0.3	2.1

Debt Current

us-gaap:DebtCurrent

Period End	2021-07-01	2020-12-31
Value	5469000.0	1647000.0
Percentage of DebtCurrent	100.0	100.0
Percentage of Assets	0.2	0.1

Liabilities Current

us-gaap:LiabilitiesCurrent

Period End	2021-07-01	2021-04-01	2020-12-31	2020-09-24	2020-06-25	2020-03-26	2019-12-26	2019-09-26	2019-06-27	2019-03-28	2018-12-27	2018-09-27	2018-06-28	2018-03-29	2017-12-28	2017-09-28	2017-06-29	2017-03-30	2016-12-29
Value	860	672	698	618	533	506	552	492	424	398	404	324	335	331	359	344	322	293	243
Percentage of LiabilitiesCurrent	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	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Assets	25.6	22.7	24.3	22.8	21.1	19.2	23.8	22.8	21.1	21.3	32.8	28.6	30.0	30.8	33.6	34.4	34.1	33.8	29.3

Long Term Debt Current

us-gaap:LongTermDebtCurrent

Period End	2021-07-01	2021-04-01	2020-12-31	2020-09-24	2020-06-25	2020-03-26	2019-12-26	2019-09-26	2019-06-27	2019-03-28	2018-12-27	2018-09-27	2018-06-28	2018-03-29	2017-12-28	2017-09-28	2017-06-29	2017-03-30	2016-12-29
Value	2103000.0	2103000.0	1647000.0	2745000.0	2558000.0	1808000.0	0	0	3500000.0	3500000.0	3500000.0	3500000.0	3500000.0	3500000.0	3500000.0	3500000.0	3500000.0	3500000.0	3500000.0
Percentage of LongTermDebtCurrent	100.0	100.0	100.0	100.0	100.0	100.0	0.0	0.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Assets	0.1	0.1	0.1	0.1	0.1	0.1	0.0	0.0	0.2	0.2	0.3	0.3	0.3	0.3	0.3	0.3	0.4	0.4	0.4

Operating Lease Liability Current

us-gaap:OperatingLeaseLiabilityCurrent

Period End	2021-07-01	2021-04-01	2020-12-31	2020-09-24	2020-06-25	2020-03-26	2019-12-26	2019-09-26	2019-06-27	2019-03-28	2018-12-27
Value	86	79	94	92	90	67	74	53	44	73	0.0
Percentage of OperatingLeaseLiabilityCurrent	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	0.0
Percentage of Assets	2.6	2.7	3.3	3.4	3.6	2.6	3.2	2.5	2.2	3.9	0.0

us-gaap:OperatingLeaseLiabilityCurrent us-gaap:PropertyPlantAndEquipmentByType

us-gaap:Building

Period End	2020-12-31	2019-12-26	2019-09-26	2019-06-27	2019-03-28
Value	88	67	47	38	68
Percentage of OperatingLeaseLiabilityCurrent	93.4	90.5	89.9	86.9	93.6
Percentage of Assets	3.1	2.9	2.2	1.9	3.7
Percentage of Assets us-gaap:Building	0.0	0.0	0.0	0.0	0.0

us-gaap:Equipment

Period End	2020-12-31	2019-12-26	2019-09-26	2019-06-27	2019-03-28
Value	3.941	3.758	3.303	3.353	2.784
Percentage of OperatingLeaseLiabilityCurrent	4.2	5.0	6.2	7.5	3.8
Percentage of Assets	0.1	0.2	0.2	0.2	0.1
Percentage of Assets us-gaap:Equipment	0.0	0.0	0.0	0.0	0.0

us-gaap:Land

Period End	2020-12-31	2019-12-26	2019-09-26	2019-06-27	2019-03-28
Value	0.44	0.17	0.085	0.089	0.093
Percentage of OperatingLeaseLiabilityCurrent	0.5	0.2	0.2	0.2	0.1
Percentage of Assets	0.0	0.0	0.0	0.0	0.0
Percentage of Assets us-gaap:Land	0.0	0.0	0.0	0.0	0.0

us-gaap:SoftwareAndSoftwareDevelopmentCosts

Period End	2020-12-31	2019-12-26	2019-09-26	2019-06-27	2019-03-28
Value	1.834	3.164	1.982	2.394	1.811
Percentage of OperatingLeaseLiabilityCurrent	1.9	4.2	3.7	5.4	2.5
Percentage of Assets	0.1	0.1	0.1	0.1	0.1
Percentage of Assets us-gaap:SoftwareAndSoftwareDevelopmentCosts	0.0	0.0	0.0	0.0	0.0

Other Accrued Liabilities Current

us-gaap:OtherAccruedLiabilitiesCurrent

Period End	2020-12-31	2019-12-26	2018-12-27	2017-12-28	2016-12-29
Value	24	35	49	57	33
Percentage of OtherAccruedLiabilitiesCurrent	100.0	100.0	100.0	100.0	100.0
Percentage of Assets	0.9	1.5	4.0	5.4	4.0

Taxes Payable Current

us-gaap:TaxesPayableCurrent

Period End	2020-12-31
Value	12
Percentage of TaxesPayableCurrent	100.0
Percentage of Assets	0.4

Liabilities Noncurrent

us-gaap:LiabilitiesNoncurrent

Period End	2021-07-01	2021-04-01	2020-12-31	2020-09-24	2020-06-25	2020-03-26	2019-12-26	2019-09-26	2019-06-27	2019-03-28	2018-12-27	2018-09-27	2018-06-28	2018-03-29	2017-12-28	2017-09-28	2017-06-29	2017-03-30	2016-12-29
Value	1324	1211	1184	1163	1144	1318	1007	941	915	855	245	244	248	257	265	268	260	429	453
Percentage of LiabilitiesNoncurrent	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	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Assets	39.4	40.8	41.1	42.9	45.3	50.0	43.3	43.6	45.5	45.6	19.9	21.6	22.2	23.9	24.9	26.8	27.6	49.4	54.5

Long Term Debt

us-gaap:LongTermDebt

Period End	2020-12-31	2020-09-24	2020-06-25	2020-03-26	2019-12-26	2019-09-26	2019-06-27	2019-03-28	2018-12-27	2018-09-27	2018-06-28	2018-03-29	2017-12-28	2017-09-28	2017-06-29	2017-03-30	2016-12-29
Value	208	209	209	415	142	143	143	146	145	146	160	173	189	187	181	354	390
Percentage of LongTermDebt	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	100.0	100.0	100.0	100.0
Percentage of Assets	7.2	7.7	8.3	15.8	6.1	6.6	7.2	7.8	11.8	12.9	14.3	16.1	17.7	18.7	19.3	40.8	47.0

Long Term Debt Noncurrent

us-gaap:LongTermDebtNoncurrent

Period End	2021-07-01	2021-04-01	2020-12-31	2020-09-24	2020-06-25	2020-03-26	2019-12-26	2019-03-28	2018-12-27	2018-09-27	2018-06-28	2018-03-29	2017-12-28	2017-09-28	2017-06-29	2017-03-30	2016-12-29
Value	195	195	207	206	206	413	142	141	141	142	143	143	144	145	146	336	337
Percentage of LongTermDebtNoncurrent	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	100.0	100.0	100.0	100.0
Percentage of Assets	5.8	6.6	7.2	7.6	8.2	15.7	6.1	7.5	11.5	12.6	12.8	13.3	13.5	14.6	15.5	38.8	40.6

Deferred Finance Costs Noncurrent Net

us-gaap:DeferredFinanceCostsNoncurrentNet us-gaap:DebtInstrument

us-gaap:DeferredFinanceCostsNoncurrentNet

fnd:TermLoanFacility

Period End	2020-12-31	2019-12-26	2018-12-27	2017-12-28
Value	9000000.0	2894000.0	3666000.0	4438000.0
Percentage of DeferredFinanceCostsNoncurrentNet	100.0	100.0	100.0	100.0
Percentage of Assets	0.3	0.1	0.3	0.4
Percentage of Assets fnd:TermLoanFacility	0.0	0.0	0.0	0.0

us-gaap:RevolvingCreditFacility

Period End	2020-12-31	2019-12-26
Value	975000.0	574000.0
Percentage of DeferredFinanceCostsNoncurrentNet	10.8	19.8
Percentage of Assets	0.0	0.0
Percentage of Assets us-gaap:RevolvingCreditFacility	0.0	0.0

Deferred Income Tax Liabilities Net

us-gaap:DeferredIncomeTaxLiabilitiesNet

Period End	2021-07-01	2021-04-01	2020-12-31	2020-09-24	2020-06-25	2020-03-26	2019-12-26	2019-09-26	2019-06-27	2018-12-27
Value	34	32	27	40	38	13	18	20	25	26
Percentage of DeferredIncomeTaxLiabilitiesNet	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Assets	1.0	1.1	1.0	1.5	1.5	0.5	0.8	0.9	1.3	2.2

Other Liabilities Noncurrent

us-gaap:OtherLiabilitiesNoncurrent

Period End	2021-07-01	2021-04-01	2020-12-31	2020-09-24	2020-06-25	2020-03-26	2019-12-26	2019-09-26	2019-06-27	2019-03-28	2018-12-27	2018-09-27	2018-06-28	2018-03-29	2017-12-28	2017-09-28	2017-06-29	2017-03-30	2016-12-29
Value	17	7.845	7.929	1.928	2.011	2.114	2.179	2.27	2.36	2.451	2.55	2.678	2.604	3.164	0.703	0.676	0.648	0.625	0.592
Percentage of OtherLiabilitiesNoncurrent	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	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Assets	0.5	0.3	0.3	0.1	0.1	0.1	0.1	0.1	0.1	0.1	0.2	0.2	0.2	0.3	0.1	0.1	0.1	0.1	0.1

Operating Lease Liability Noncurrent

us-gaap:OperatingLeaseLiabilityNoncurrent

Period End	2021-07-01	2021-04-01	2020-12-31	2020-09-24	2020-06-25	2020-03-26	2019-12-26	2019-09-26	2019-06-27	2019-03-28	2018-12-27
Value	1077	975	941	914	896	889	844	775	747	683	0.0
Percentage of OperatingLeaseLiabilityNoncurrent	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	0.0
Percentage of Assets	32.0	32.9	32.7	33.7	35.5	33.8	36.3	36.0	37.2	36.5	0.0

us-gaap:OperatingLeaseLiabilityNoncurrent us-gaap:PropertyPlantAndEquipmentByType

us-gaap:Building

Period End	2020-12-31	2019-12-26	2019-09-26	2019-06-27	2019-03-28
Value	873	837	769	740	675
Percentage of OperatingLeaseLiabilityNoncurrent	92.8	99.2	99.2	99.1	98.8
Percentage of Assets	30.3	36.0	35.7	36.8	36.1
Percentage of Assets us-gaap:Building	0.0	0.0	0.0	0.0	0.0

us-gaap:Equipment

Period End	2020-12-31	2019-12-26	2019-09-26	2019-06-27	2019-03-28
Value	2.924	3.902	4.066	4.601	4.663
Percentage of OperatingLeaseLiabilityNoncurrent	0.3	0.5	0.5	0.6	0.7
Percentage of Assets	0.1	0.2	0.2	0.2	0.2
Percentage of Assets us-gaap:Equipment	0.0	0.0	0.0	0.0	0.0

us-gaap:Land

Period End	2020-12-31	2019-12-26	2019-09-26	2019-06-27	2019-03-28
Value	65	2.357	0.114	0.136	0.158
Percentage of OperatingLeaseLiabilityNoncurrent	6.9	0.3	0.0	0.0	0.0
Percentage of Assets	2.3	0.1	0.0	0.0	0.0
Percentage of Assets us-gaap:Land	0.0	0.0	0.0	0.0	0.0

Lessee Operating Lease Liability Payments Due Year Two

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo

Period End	2021-07-01	2021-04-01	2020-12-31	2020-09-24
Value	156	140	141	133
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearTwo	100.0	100.0	100.0	100.0
Percentage of Assets	4.7	4.7	4.9	4.9

Lessee Operating Lease Liability Payments Due Year Three

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree

Period End	2021-07-01	2021-04-01	2020-12-31	2020-09-24
Value	149	137	136	133
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearThree	100.0	100.0	100.0	100.0
Percentage of Assets	4.4	4.6	4.7	4.9

Lessee Operating Lease Liability Payments Due Year Four

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour

Period End	2021-07-01	2021-04-01	2020-12-31	2020-09-24
Value	139	128	133	124
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearFour	100.0	100.0	100.0	100.0
Percentage of Assets	4.1	4.3	4.6	4.6

Lessee Operating Lease Liability Payments Due Year Five

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFive

Period End	2020-12-31
Value	125
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearFive	100.0
Percentage of Assets	4.4

Lessee Operating Lease Liability Payments Due After Year Five

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive

Period End	2020-12-31
Value	713
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive	100.0
Percentage of Assets	24.8

Operating Lease Liability

us-gaap:OperatingLeaseLiability

Period End	2021-07-01	2021-04-01	2020-12-31	2020-09-24	2019-12-26	2019-09-26	2019-06-27	2019-03-28
Value	1163	1054	1035	1007	918	828	792	757
Percentage of OperatingLeaseLiability	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Assets	34.6	35.6	36.0	37.1	39.5	38.4	39.4	40.4

Lessee Operating Lease Liability Payments Due

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDue

Period End	2021-07-01	2021-04-01	2020-12-31	2020-09-24
Value	1593	1431	1397	1330
Percentage of LesseeOperatingLeaseLiabilityPaymentsDue	100.0	100.0	100.0	100.0
Percentage of Assets	47.4	48.3	48.5	49.0

Lessee Operating Lease Liability Undiscounted Excess Amount

us-gaap:LesseeOperatingLeaseLiabilityUndiscountedExcessAmount

Period End	2021-07-01	2021-04-01	2020-12-31	2020-09-24
Value	430	376	361	322
Percentage of LesseeOperatingLeaseLiabilityUndiscountedExcessAmount	100.0	100.0	100.0	100.0
Percentage of Assets	12.8	12.7	12.6	11.9

Stockholders Equity

us-gaap:StockholdersEquity

Period End	2021-07-01	2021-04-01	2020-12-31	2020-09-24	2020-06-25	2020-03-26	2019-12-26	2019-09-26	2019-06-27	2019-03-28	2018-12-27	2018-09-27	2018-06-28	2018-03-29	2017-12-28	2017-09-28	2017-06-29	2017-03-30	2016-12-29	2015-12-31	2014-12-25
Value	1179	1080	997	931	850	809	764	723	670	619	584	563	534	487	442	388	361	146	134	312	282
Percentage of StockholdersEquity	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	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Assets	35.1	36.5	34.6	34.3	33.6	30.7	32.9	33.5	33.4	33.1	47.3	49.8	47.8	45.3	41.5	38.8	38.2	16.8	16.2	0.0	0.0

us-gaap:StockholdersEquity us-gaap:StatementClassOfStock, us-gaap:StatementEquityComponents

us-gaap:CommonClassA, us-gaap:CommonStock

Period End	2021-07-01	2021-04-01	2020-12-31	2020-09-24	2020-06-25	2020-03-26	2019-12-26	2019-09-26	2019-06-27	2019-03-28	2018-12-27	2018-09-27	2018-06-28	2018-03-29	2017-12-28	2016-12-29	2015-12-31	2014-12-25
Value	0.105	0.105	0.104	0.104	0.103	0.102	0.101	0.101	0.099	0.098	0.098	0.097	0.097	0.096	0.096	0.077	0.077	0.077
Percentage of StockholdersEquity	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.1	0.0	0.0
Percentage of Assets	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0
Percentage of Assets us-gaap:CommonClassA us-gaap:CommonStock	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0

us-gaap:StockholdersEquity us-gaap:StatementEquityComponents

us-gaap:AccumulatedOtherComprehensiveIncome

Period End	2021-07-01	2021-04-01	2020-12-31	2020-09-24	2020-06-25	2020-03-26	2019-12-26	2019-09-26	2019-06-27	2019-03-28	2018-12-27	2018-09-27	2018-06-28	2018-03-29	2017-12-28	2016-12-29	2015-12-31	2014-12-25
Value	0.24	0.247	0.164	0.056	-0.033	-0.125	-0.193	-0.361	-0.361	-0.148	0.186	0.591	0.46	0.225	-0.205	0.176	-0.1	-0.143
Percentage of StockholdersEquity	0.0	0.0	0.0	0.0	-0.0	-0.0	-0.0	-0.0	-0.1	-0.0	0.0	0.1	0.1	0.0	-0.0	0.1	-0.0	-0.1
Percentage of Assets	0.0	0.0	0.0	0.0	-0.0	-0.0	-0.0	-0.0	-0.0	-0.0	0.0	0.1	0.0	0.0	-0.0	0.0	0.0	0.0
Percentage of Assets us-gaap:AccumulatedOtherComprehensiveIncome	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0

us-gaap:AdditionalPaidInCapital

Period End	2021-07-01	2021-04-01	2020-12-31	2020-09-24	2020-06-25	2020-03-26	2019-12-26	2019-09-26	2019-06-27	2019-03-28	2018-12-27	2018-09-27	2018-06-28	2018-03-29	2017-12-28	2016-12-29	2015-12-31	2014-12-25
Value	431	415	408	399	387	378	370	364	353	345	340	337	335	328	323	117	264	261
Percentage of StockholdersEquity	36.6	38.5	40.9	42.9	45.5	46.7	48.5	50.4	52.7	55.8	58.3	59.8	62.7	67.3	73.0	87.3	84.6	92.5
Percentage of Assets	12.8	14.0	14.2	14.7	15.3	14.4	15.9	16.9	17.6	18.5	27.6	29.8	30.0	30.5	30.3	14.1	0.0	0.0
Percentage of Assets us-gaap:AdditionalPaidInCapital	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0

us-gaap:RetainedEarnings

Period End	2021-07-01	2021-04-01	2020-12-31	2020-09-24	2020-06-25	2020-03-26	2019-12-26	2019-09-26	2019-06-27	2019-03-28	2018-12-27	2018-09-27	2018-06-28	2018-03-29	2017-12-28	2016-12-29	2015-12-31	2014-12-25
Value	747	664	588	531	463	431	394	358	317	274	243	225	199	159	119	16	48	21
Percentage of StockholdersEquity	63.4	61.5	59.1	57.1	54.4	53.3	51.5	49.6	47.4	44.2	41.7	40.0	37.2	32.7	27.0	12.5	15.4	7.5
Percentage of Assets	22.2	22.4	20.4	19.6	18.3	16.4	17.0	16.6	15.8	14.6	19.7	19.9	17.8	14.8	11.2	2.0	0.0	0.0
Percentage of Assets us-gaap:RetainedEarnings	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0

Common Stock Value

us-gaap:CommonStockValue us-gaap:StatementClassOfStock

us-gaap:CommonStockValue

us-gaap:CommonClassA

Period End	2021-07-01	2021-04-01	2020-12-31	2020-09-24	2020-06-25	2020-03-26	2019-12-26	2019-09-26	2019-06-27	2019-03-28	2018-12-27	2018-09-27	2018-06-28	2018-03-29	2017-12-28	2017-09-28	2017-06-29	2017-03-30	2016-12-29
Value	105000.0	105000.0	104000.0	104000.0	103000.0	102000.0	101000.0	101000.0	99000.0	98000.0	98000.0	97000.0	97000.0	96000.0	96000.0	95000.0	87000.0	77000.0	77000.0
Percentage of CommonStockValue	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	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Assets	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0
Percentage of Assets us-gaap:CommonClassA	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0

Additional Paid In Capital Common Stock

us-gaap:AdditionalPaidInCapitalCommonStock

Period End	2021-07-01	2021-04-01	2020-12-31	2020-09-24	2020-06-25	2020-03-26	2019-12-26	2019-09-26	2019-06-27	2019-03-28	2018-12-27	2018-09-27	2018-06-28	2018-03-29	2017-12-28	2017-09-28	2017-06-29	2017-03-30	2016-12-29
Value	431	415	408	399	387	378	370	364	353	345	340	337	335	328	323	317	313	118	117
Percentage of AdditionalPaidInCapitalCommonStock	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	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Assets	12.8	14.0	14.2	14.7	15.3	14.4	15.9	16.9	17.6	18.5	27.6	29.8	30.0	30.5	30.3	31.7	33.2	13.6	14.1

Retained Earnings Accumulated Deficit

us-gaap:RetainedEarningsAccumulatedDeficit

Period End	2021-07-01	2021-04-01	2020-12-31	2020-09-24	2020-06-25	2020-03-26	2019-12-26	2019-09-26	2019-06-27	2019-03-28	2018-12-27	2018-09-27	2018-06-28	2018-03-29	2017-12-28	2017-09-28	2017-06-29	2017-03-30	2016-12-29
Value	747	664	588	531	463	431	394	358	317	274	243	225	199	159	119	71	48	27	16
Percentage of RetainedEarningsAccumulatedDeficit	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	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Assets	22.2	22.4	20.4	19.6	18.3	16.4	17.0	16.6	15.8	14.6	19.7	19.9	17.8	14.8	11.2	7.2	5.1	3.2	2.0

Accumulated Other Comprehensive Income Loss Net Of Tax

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax

Period End	2021-07-01	2021-04-01	2020-12-31	2020-09-24	2020-06-25	2020-03-26	2019-12-26	2019-09-26	2019-06-27	2019-03-28	2018-12-27	2018-09-27	2018-06-28	2018-03-29	2017-12-28	2017-09-28	2017-06-29	2017-03-30	2016-12-29
Value	240000.0	247000.0	164000.0	56000.0	-33000.0	-125000.0	-193000.0	-361000.0	-361000.0	-148000.0	186000.0	591000.0	460000.0	225000.0	-205000.0	-711000.0	-590000.0	-106000.0	176000.0
Percentage of AccumulatedOtherComprehensiveIncomeLossNetOfTax	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	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Assets	0.0	0.0	0.0	0.0	-0.0	-0.0	-0.0	-0.0	-0.0	-0.0	0.0	0.1	0.0	0.0	-0.0	-0.1	-0.1	-0.0	0.0

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

us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue

Period End	2021-07-01	2021-04-01	2020-09-24	2020-06-25	2020-03-26	2019-09-26	2019-06-27	2019-03-28	2018-09-27	2018-06-28	2018-03-29
Value	5.319	4.734	4.4	4.234	2.908	2.242	2.168	2.25	1.659	1.536	1.415
Percentage of AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Assets	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0

us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital

Period End	2021-07-01	2021-04-01	2020-09-24	2020-06-25	2020-03-26	2019-09-26	2019-06-27	2019-03-28	2018-09-27	2018-06-28	2018-03-29
Value	5.319	4.734	4.4	4.234	2.908	2.242	2.168	2.25	1.659	1.536	1.415
Percentage of AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Assets	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0
Percentage of Assets us-gaap:AdditionalPaidInCapital	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0

Net Cash Provided By Used In Operating Activities

us-gaap:NetCashProvidedByUsedInOperatingActivities

Period End	2021-07-01	2021-04-01	2020-12-31	2020-09-24	2020-06-25	2020-03-26	2019-12-26	2019-09-26	2019-06-27	2019-03-28	2018-12-27	2018-09-27	2018-06-28	2018-03-29	2017-12-28	2017-09-28	2017-06-29	2017-03-30	2016-12-29	2016-09-29
Value	155	100	136	172	72	24	-4.936	87	95	27	41	59	43	40	26	16	10	56	18	27
Percentage of NetCashProvidedByUsedInOperatingActivities	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	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	18.1	12.9	18.9	25.3	15.6	4.4	-0.9	16.8	18.3	5.7	9.6	13.7	10.0	10.1	6.8	4.8	3.0	18.2	6.7	10.2

Net Cash Provided By Used In Investing Activities

us-gaap:NetCashProvidedByUsedInInvestingActivities

Period End	2021-07-01	2021-04-01	2020-12-31	2020-09-24	2020-06-25	2020-03-26	2019-12-26	2019-09-26	2019-06-27	2019-03-28	2018-12-27	2018-09-27	2018-06-28	2018-03-29	2017-12-28	2017-09-28	2017-06-29	2017-03-30	2016-12-29	2016-09-29
Value	-149570000.0	-45876000.0	-102800000.0	-43659000.0	-27610000.0	-38384000.0	-54993000.0	-62843000.0	-46538000.0	-31634000.0	-42002000.0	-45957000.0	-35597000.0	-27841000.0	-32614000.0	-24141000.0	-25697000.0	-19801000.0	-22408000.0	-21320000.0
Percentage of NetCashProvidedByUsedInInvestingActivities	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	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	-17.4	-5.9	-14.2	-6.4	-6.0	-6.9	-10.4	-12.1	-8.9	-6.6	-9.6	-10.5	-8.2	-6.9	-8.4	-7.0	-7.5	-6.4	-8.1	-7.9

Net Cash Provided By Used In Financing Activities

us-gaap:NetCashProvidedByUsedInFinancingActivities

Period End	2021-07-01	2021-04-01	2020-12-31	2020-09-24	2020-06-25	2020-03-26	2019-12-26	2019-09-26	2019-06-27	2019-03-28	2018-12-27	2018-09-27	2018-06-28	2018-03-29	2017-12-28	2017-09-28	2017-06-29	2017-03-30	2016-12-29	2016-09-29
Value	5.99	-8.841	2.962	7.385	-199.938	276	2.86	8.062	2.401	4.42	0.187	-13.832	-7.739	-12.755	6.259	7.898	15	-36.279	3.986	-6.365
Percentage of NetCashProvidedByUsedInFinancingActivities	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	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	0.7	-1.1	0.4	1.1	-43.2	49.8	0.5	1.5	0.5	0.9	0.0	-3.2	-1.8	-3.2	1.6	2.3	4.4	-11.8	1.4	-2.3

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

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect

Period End	2021-07-01	2021-04-01	2020-12-31	2020-09-24	2020-06-25	2020-03-26	2019-12-26	2019-09-26	2019-06-27	2019-03-28	2018-12-27	2018-09-27	2018-06-28	2018-03-29	2017-12-28	2017-09-28
Value	12	46	36	136	-155.511	262	-57.069	32	50	-0.193	0.11	-0.013	-0.025	0.016	-0.011	0.181
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	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	100.0	100.0	100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	1.4	5.9	5.1	20.0	-33.6	47.4	-10.8	6.3	9.8	-0.0	0.0	-0.0	-0.0	0.0	-0.0	0.1

Deferred Income Tax Expense Benefit

us-gaap:DeferredIncomeTaxExpenseBenefit

Period End	2021-07-01	2021-04-01	2020-12-31	2020-09-24	2020-06-25	2020-03-26	2019-12-26	2019-09-26	2019-06-27	2019-03-28	2018-12-27	2018-09-27	2018-06-28	2018-03-29	2017-12-28	2017-09-28	2017-06-29	2017-03-30	2016-12-29	2016-09-29	2016-06-30	2016-03-31
Value	2.061	4.459	-12.559	1.621	25	-4.739	-3.94	-5.166	-0.421	-1.057	-3.573	-0.217	0.711	2.111	-10.132	1.989	2.133	5.453	-10.066	2.984	1.414	0.132
Percentage of DeferredIncomeTaxExpenseBenefit	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	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

Depreciation Depletion And Amortization

us-gaap:DepreciationDepletionAndAmortization

Period End	2021-07-01	2021-04-01	2020-12-31	2020-09-24	2020-06-25	2020-03-26	2019-12-26	2019-09-26	2019-06-27	2019-03-28	2018-12-27	2018-09-27	2018-06-28	2018-03-29	2017-12-28	2017-09-28	2017-06-29	2017-03-30	2016-12-29	2016-09-29	2016-06-30	2016-03-31
Value	27	26	24	22	22	22	20	18	17	17	14	13	12	11	10	9.579	9.125	8.933	8.251	6.657	7.571	6.125
Percentage of DepreciationDepletionAndAmortization	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	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

Increase Decrease In Accounts Payable

us-gaap:IncreaseDecreaseInAccountsPayable

Period End	2021-07-01	2021-04-01	2020-12-31	2020-09-24	2020-06-25	2020-03-26	2019-12-26	2019-09-26	2019-06-27	2019-03-28	2018-12-27	2018-09-27	2018-06-28	2018-03-29	2017-12-28	2017-09-28	2017-06-29	2017-03-30	2016-12-29	2016-09-29	2016-06-30	2016-03-31
Value	118	-13.376	55	36	6.217	-48.644	50	45	43	-84.005	75	-27.202	9.98	-3.723	9.484	5.662	37	47	-7.343	-1.842	18	1.943
Percentage of IncreaseDecreaseInAccountsPayable	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	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

Increase Decrease In Inventories

us-gaap:IncreaseDecreaseInInventories

Period End	2021-07-01	2021-04-01	2020-12-31	2020-09-24	2020-06-25	2020-03-26	2019-12-26	2019-09-26	2019-06-27	2019-03-28	2018-12-27	2018-09-27	2018-06-28	2018-03-29	2017-12-28	2017-09-28	2017-06-29	2017-03-30	2016-12-29	2016-09-29	2016-06-30	2016-03-31
Value	71	-46.351	55	4.192	5.328	7.076	97	37	8.892	-33.51	67	-28.674	5.727	9.262	32	28	50	22	-7.908	2.709	13	12
Percentage of IncreaseDecreaseInInventories	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	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

Net Cash Provided By Used In Operating Activities

us-gaap:NetCashProvidedByUsedInOperatingActivities

Period End	2021-07-01	2021-04-01	2020-12-31	2020-09-24	2020-06-25	2020-03-26	2019-12-26	2019-09-26	2019-06-27	2019-03-28	2018-12-27	2018-09-27	2018-06-28	2018-03-29	2017-12-28	2017-09-28	2017-06-29	2017-03-30	2016-12-29	2016-09-29
Value	155	100	136	172	72	24	-4.936	87	95	27	41	59	43	40	26	16	10	56	18	27
Percentage of NetCashProvidedByUsedInOperatingActivities	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	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	18.1	12.9	18.9	25.3	15.6	4.4	-0.9	16.8	18.3	5.7	9.6	13.7	10.0	10.1	6.8	4.8	3.0	18.2	6.7	10.2

Net Income Loss

us-gaap:NetIncomeLoss

Period End	2021-07-01	2021-04-01	2020-12-31	2020-09-24	2020-06-25	2020-03-26	2019-12-26	2019-09-26	2019-06-27	2019-03-28	2018-12-27	2018-09-27	2018-06-28	2018-03-29	2017-12-28	2017-09-28	2017-06-29	2017-03-30	2016-12-29	2016-09-29	2016-06-30	2016-03-31
Value	82	75	57	68	32	37	35	40	43	30	17	26	39	31	47	23	20	11	16	14	5.012	7.101
Percentage of NetIncomeLoss	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	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	9.6	9.7	7.9	10.0	6.9	6.7	6.7	7.9	8.4	6.4	4.1	6.1	9.2	7.9	12.3	6.8	5.9	3.6	6.0	5.2	1.9	3.0

us-gaap:NetIncomeLoss us-gaap:StatementEquityComponents

us-gaap:RetainedEarnings

Period End	2021-07-01	2021-04-01	2020-09-24	2020-06-25	2020-03-26	2019-09-26	2019-06-27	2019-03-28	2018-09-27	2018-06-28	2018-03-29
Value	82	75	68	32	37	40	43	30	26	39	31
Percentage of NetIncomeLoss	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	9.6	9.7	10.0	6.9	6.7	7.9	8.4	6.4	6.1	9.2	7.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:RetainedEarnings	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0

Share Based Compensation

us-gaap:ShareBasedCompensation

Period End	2021-07-01	2021-04-01	2020-12-31	2020-09-24	2020-06-25	2020-03-26	2019-12-26	2019-09-26	2019-06-27	2019-03-28	2018-12-27	2018-09-27	2018-06-28	2018-03-29	2017-12-28	2017-09-28	2017-06-29	2017-03-30	2016-12-29	2016-09-29	2016-06-30	2016-03-31
Value	5.319	4.734	4.573	4.4	4.234	2.908	2.051	2.242	2.168	2.25	1.903	1.659	1.537	1.415	1.406	1.418	1.25	0.885	1.023	0.746	0.705	0.755
Percentage of ShareBasedCompensation	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	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

Net Cash Provided By Used In Investing Activities

us-gaap:NetCashProvidedByUsedInInvestingActivities

Period End	2021-07-01	2021-04-01	2020-12-31	2020-09-24	2020-06-25	2020-03-26	2019-12-26	2019-09-26	2019-06-27	2019-03-28	2018-12-27	2018-09-27	2018-06-28	2018-03-29	2017-12-28	2017-09-28	2017-06-29	2017-03-30	2016-12-29	2016-09-29
Value	-149570000.0	-45876000.0	-102800000.0	-43659000.0	-27610000.0	-38384000.0	-54993000.0	-62843000.0	-46538000.0	-31634000.0	-42002000.0	-45957000.0	-35597000.0	-27841000.0	-32614000.0	-24141000.0	-25697000.0	-19801000.0	-22408000.0	-21320000.0
Percentage of NetCashProvidedByUsedInInvestingActivities	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	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	-17.4	-5.9	-14.2	-6.4	-6.0	-6.9	-10.4	-12.1	-8.9	-6.6	-9.6	-10.5	-8.2	-6.9	-8.4	-7.0	-7.5	-6.4	-8.1	-7.9

Payments To Acquire Productive Assets

us-gaap:PaymentsToAcquireProductiveAssets

Period End	2021-07-01	2021-04-01	2020-12-31	2020-09-24	2020-06-25	2020-03-26	2019-12-26	2019-09-26	2019-06-27	2019-03-28	2018-12-27	2018-09-27	2018-06-28	2018-03-29	2017-12-28	2017-09-28	2017-06-29	2017-03-30	2016-12-29	2016-09-29	2016-06-30	2016-03-31
Value	86	45	102	43	27	38	54	62	46	31	42	45	35	27	32	24	25	19	22	21	17	13
Percentage of PaymentsToAcquireProductiveAssets	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	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

Net Cash Provided By Used In Financing Activities

us-gaap:NetCashProvidedByUsedInFinancingActivities

Period End	2021-07-01	2021-04-01	2020-12-31	2020-09-24	2020-06-25	2020-03-26	2019-12-26	2019-09-26	2019-06-27	2019-03-28	2018-12-27	2018-09-27	2018-06-28	2018-03-29	2017-12-28	2017-09-28	2017-06-29	2017-03-30	2016-12-29	2016-09-29
Value	5.99	-8.841	2.962	7.385	-199.938	276	2.86	8.062	2.401	4.42	0.187	-13.832	-7.739	-12.755	6.259	7.898	15	-36.279	3.986	-6.365
Percentage of NetCashProvidedByUsedInFinancingActivities	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	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	0.7	-1.1	0.4	1.1	-43.2	49.8	0.5	1.5	0.5	0.9	0.0	-3.2	-1.8	-3.2	1.6	2.3	4.4	-11.8	1.4	-2.3

Repayments Of Long Term Debt

us-gaap:RepaymentsOfLongTermDebt us-gaap:DebtInstrument

us-gaap:RepaymentsOfLongTermDebt

fnd:TermLoanFacilityB1

Period End	2021-02-09
Value	75
Percentage of RepaymentsOfLongTermDebt	100.0

Effective Income Tax Rate Continuing Operations

us-gaap:EffectiveIncomeTaxRateContinuingOperations

Period End	2021-07-01	2021-04-01	2020-09-24	2020-06-25	2020-03-26	2019-09-26	2019-06-27	2019-03-28	2018-09-27	2018-06-28	2018-03-29	2017-09-28	2017-06-29	2017-03-30	2016-09-29
Value	14.8	19.8	10.4	-0.616	0.174	-0.393	0.002	0.166	0.171	-0.109	0.082	-0.059	-0.096	0.355	-0.01
Percentage of EffectiveIncomeTaxRateContinuingOperations	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	100.0	100.0

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

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice

Period End	2021-07-01	2021-04-01	2020-12-31	2020-09-24	2020-06-25	2020-03-26	2019-12-26	2018-12-27	2017-12-28	2016-12-29	2015-12-31	2014-12-25
Value	24.09	22.47	20.72	19.25	17.74	16.05	13.64	10.11	7.28	5.34	4.77	4.4
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

Deferred Tax Liabilities

us-gaap:DeferredTaxLiabilities

Period End	2020-12-31	2019-12-26	2018-12-27	2017-12-28	2016-12-29
Value	27	18	26	27	28
Percentage of DeferredTaxLiabilities	100.0	100.0	100.0	100.0	100.0

Unrecognized Tax Benefits

us-gaap:UnrecognizedTaxBenefits

Period End	2020-12-31	2019-12-26	2018-12-27	2017-12-28	2016-12-29	2015-12-31
Value	6107000.0	402000.0	0	0	0	0
Percentage of UnrecognizedTaxBenefits	100.0	100.0	0.0	0.0	0.0	0.0

fnd:NegativeLeaseExpenseRelatedToRentAbatementConcessions

Period End	2020-12-31	2020-09-24	2020-06-25
Value	0	100000.0	100000.0
Percentage of NegativeLeaseExpenseRelatedToRentAbatementConcessions	0.0	100.0	100.0

us-gaap:AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation

Period End	2021-07-01	2021-04-01
Value	50000.0	966000.0
Percentage of AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation	100.0	100.0

us-gaap:AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital

Period End	2021-07-01	2021-04-01
Value	50000.0	966000.0
Percentage of AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation	100.0	100.0

us-gaap:AmortizationOfDeferredHedgeGains

Period End	2021-07-01	2021-04-01	2020-12-31	2020-09-24	2020-06-25	2020-03-26	2019-12-26	2019-09-26	2019-06-27	2019-03-28
Value	-8000.0	84000.0	108000.0	94000.0	87000.0	83000.0	123000.0	-927000.0	640000.0	610000.0
Percentage of AmortizationOfDeferredHedgeGains	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:BusinessCombinationAcquisitionRelatedCosts us-gaap:BusinessAcquisition

us-gaap:BusinessCombinationAcquisitionRelatedCosts

fnd:SpartanSurfacesInc

Period End	2021-06-04
Value	3200000.0
Percentage of BusinessCombinationAcquisitionRelatedCosts	100.0

us-gaap:BusinessCombinationConsiderationTransferred1 us-gaap:BusinessAcquisition

us-gaap:BusinessCombinationConsiderationTransferred1

fnd:SpartanSurfacesInc

Period End	2021-06-04
Value	77
Percentage of BusinessCombinationConsiderationTransferred1	100.0

us-gaap:BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable us-gaap:BusinessAcquisition

us-gaap:BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable

fnd:SpartanSurfacesInc

Period End	2021-06-04
Value	5000000.0
Percentage of BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable	100.0

us-gaap:BusinessCombinationConsiderationTransferredLiabilitiesIncurred us-gaap:BusinessAcquisition

us-gaap:BusinessCombinationConsiderationTransferredLiabilitiesIncurred

fnd:SpartanSurfacesInc

Period End	2021-06-04
Value	9090000.0
Percentage of BusinessCombinationConsiderationTransferredLiabilitiesIncurred	100.0

us-gaap:BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentConsiderationTransferred us-gaap:BusinessAcquisition

us-gaap:BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentConsiderationTransferred

fnd:SpartanSurfacesInc

Period End	2021-06-04
Value	213000.0
Percentage of BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentConsiderationTransferred	100.0

us-gaap:CapitalExpendituresIncurredButNotYetPaid

Period End	2021-07-01	2021-04-01	2020-12-31	2020-09-24	2020-06-25	2020-03-26	2019-12-26	2019-09-26	2019-06-27	2019-03-28	2018-12-27	2018-09-27	2018-06-28	2018-03-29	2017-12-28	2017-09-28	2017-06-29	2017-03-30	2016-12-29	2016-09-29	2016-06-30	2016-03-31
Value	55	46	-6.454	3.81	3.011	19	-3.867	-2.026	14	10	0.62	-4.096	2.264	16	-1.829	1.878	1.1	7.372	-1.921	-1.151	1.495	6.964
Percentage of CapitalExpendituresIncurredButNotYetPaid	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	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:ConcentrationRiskPercentage1 us-gaap:ProductOrService, us-gaap:ConcentrationRiskByBenchmark, us-gaap:ConcentrationRiskByType

us-gaap:ConcentrationRiskPercentage1

fnd:AdjacentCategories, us-gaap:RevenueFromContractWithCustomerProductAndServiceBenchmark, us-gaap:ProductConcentrationRisk

Period End	2021-07-01	2021-04-01	2020-06-25
Value	2.0	2.0	1.0
Percentage of ConcentrationRiskPercentage1	100.0	100.0	100.0

fnd:DecorativeAccessories, us-gaap:RevenueFromContractWithCustomerProductAndServiceBenchmark, us-gaap:ProductConcentrationRisk

Period End	2021-07-01	2021-04-01	2020-09-24	2020-06-25	2020-03-26	2019-09-26	2019-06-27	2019-03-28	2018-09-27	2018-06-28
Value	19.0	20.0	20.0	0.19	0.2	0.19	0.19	0.2	0.19	0.19
Percentage of ConcentrationRiskPercentage1	950.0	1000.0	0.0	19.0	0.0	0.0	0.0	0.0	0.0	0.0

fnd:InstallationMaterialsAndTools, us-gaap:RevenueFromContractWithCustomerProductAndServiceBenchmark, us-gaap:ProductConcentrationRisk

Period End	2021-07-01	2021-04-01	2020-09-24	2020-06-25	2020-03-26	2019-09-26	2019-06-27	2019-03-28	2018-09-27	2018-06-28
Value	16.0	17.0	17.0	0.16	0.17	0.17	0.17	0.17	0.16	0.16
Percentage of ConcentrationRiskPercentage1	800.0	850.0	0.0	16.0	0.0	0.0	0.0	0.0	0.0	0.0

fnd:LaminateLuxuryVinylPlank, us-gaap:RevenueFromContractWithCustomerProductAndServiceBenchmark, us-gaap:ProductConcentrationRisk

Period End	2021-07-01	2021-04-01	2020-09-24	2020-06-25	2020-03-26	2019-09-26	2019-06-27	2019-03-28	2018-09-27	2018-06-28
Value	25.0	24.0	23.0	0.23	0.23	0.22	0.21	0.2	0.19	0.18
Percentage of ConcentrationRiskPercentage1	1250.0	1200.0	0.0	23.0	0.0	0.0	0.0	0.0	0.0	0.0

fnd:NaturalStone, us-gaap:RevenueFromContractWithCustomerProductAndServiceBenchmark, us-gaap:ProductConcentrationRisk

Period End	2021-07-01	2021-04-01	2020-09-24	2020-06-25	2020-03-26	2019-09-26	2019-06-27	2019-03-28	2018-09-27	2018-06-28
Value	6.0	6.0	6.0	0.06	0.06	0.06	0.06	0.07	0.06	0.07
Percentage of ConcentrationRiskPercentage1	300.0	300.0	0.0	6.0	0.0	0.0	0.0	0.0	0.0	0.0

fnd:Tile, us-gaap:RevenueFromContractWithCustomerProductAndServiceBenchmark, us-gaap:ProductConcentrationRisk

Period End	2021-07-01	2021-04-01	2020-09-24	2020-06-25	2020-03-26	2019-09-26	2019-06-27	2019-03-28	2018-09-27	2018-06-28
Value	24.0	24.0	25.0	0.26	0.24	0.26	0.26	0.26	0.28	0.28
Percentage of ConcentrationRiskPercentage1	1200.0	1200.0	0.0	26.0	0.0	0.0	0.0	0.0	0.0	0.0

fnd:WoodFlooring, us-gaap:RevenueFromContractWithCustomerProductAndServiceBenchmark, us-gaap:ProductConcentrationRisk

Period End	2021-07-01	2021-04-01	2020-09-24	2020-06-25	2020-03-26	2019-09-26	2019-06-27	2019-03-28
Value	8.0	8.0	9.0	0.09	0.09	10.0	0.1	0.1
Percentage of ConcentrationRiskPercentage1	400.0	400.0	0.0	9.0	0.0	0.0	0.0	0.0

us-gaap:ProductAndServiceOther, us-gaap:RevenueFromContractWithCustomerProductAndServiceBenchmark, us-gaap:ProductConcentrationRisk

Period End	2021-04-01	2020-06-25	2020-03-26	2019-06-27	2019-03-28
Value	-1.0	0.01	0.01	0.01	0
Percentage of ConcentrationRiskPercentage1	-50.0	1.0	0.0	0.0	0.0

us-gaap:ContractWithCustomerLiabilityRevenueRecognized

Period End	2021-07-01	2021-04-01	2020-12-31
Value	300000.0	8000000.0	-500000.0
Percentage of ContractWithCustomerLiabilityRevenueRecognized	100.0	100.0	100.0

us-gaap:FinitelivedIntangibleAssetsAcquired1 us-gaap:BusinessAcquisition, us-gaap:FiniteLivedIntangibleAssetsByMajorClass

us-gaap:FinitelivedIntangibleAssetsAcquired1

fnd:SpartanSurfacesInc, fnd:NonCompeteAgreement

Period End	2021-06-04
Value	0.3
Percentage of FinitelivedIntangibleAssetsAcquired1	100.0

fnd:SpartanSurfacesInc, us-gaap:CustomerRelationships

Period End	2021-06-04
Value	34
Percentage of FinitelivedIntangibleAssetsAcquired1	11633.3

us-gaap:GainLossOnSalesOfAssetsAndAssetImpairmentCharges

Period End	2020-12-31	2020-09-24	2020-06-25	2020-03-26	2019-12-26	2019-09-26	2019-06-27	2019-03-28	2018-12-27
Value	70000.0	-113000.0	0	29000.0	0	-4089000.0	-22000.0	0	-23000.0
Percentage of GainLossOnSalesOfAssetsAndAssetImpairmentCharges	100.0	100.0	0.0	100.0	0.0	100.0	100.0	0.0	100.0

us-gaap:IncomeTaxCreditsAndAdjustments

Period End	2020-12-31	2020-09-24	2020-06-25
Value	300000.0	300000.0	1100000.0
Percentage of IncomeTaxCreditsAndAdjustments	100.0	100.0	100.0

us-gaap:IncomeTaxCreditsAndAdjustments us-gaap:TaxCreditCarryforward

fnd:TaxCreditCarryforwardsRecognizedAsOffsetToGeneralAndAdministrativeExpenses

Period End	2020-12-31	2020-09-24	2020-06-25
Value	0	0	200000.0
Percentage of IncomeTaxCreditsAndAdjustments	0.0	0.0	18.2

fnd:TaxCreditCarryforwardsRecognizedAsOffsetToSellingAndStoreOperatingExpenses

Period End	2020-12-31	2020-09-24	2020-06-25
Value	300000.0	300000.0	900000.0
Percentage of IncomeTaxCreditsAndAdjustments	100.0	100.0	81.8

us-gaap:IncomeTaxCreditsAndAdjustments us-gaap:TaxCreditCarryforward, us-gaap:UnusualOrInfrequentItem

fnd:TaxCreditCarryforwardsRecognizedAsOffsetToSellingAndStoreOperatingExpenses, fnd:CARESAct

Period End	2021-04-01
Value	700000.0
Percentage of IncomeTaxCreditsAndAdjustments	0.0

fnd:TaxCreditRecognizedAsOffsetToSellingAndStoreOperatingExpenses, fnd:CARESAct

Period End	2021-07-01	2020-06-25
Value	300000.0	900000.0
Percentage of IncomeTaxCreditsAndAdjustments	0.0	81.8

us-gaap:IncreaseDecreaseInAccruedIncomeTaxesPayable

Period End	2021-07-01	2021-04-01	2020-12-31	2020-09-24	2020-06-25	2020-03-26	2019-12-26	2019-09-26	2019-06-27	2019-03-28	2018-12-27	2018-09-27	2018-06-28	2018-03-29	2017-12-28	2017-09-28	2017-06-29	2017-03-30	2016-12-29	2016-09-29	2016-06-30	2016-03-31
Value	-9.785	1.244	38	2.251	-37.642	12	8.765	-6.412	-11.602	13	5.909	5.632	-6.1	0.78	-8.492	-1.899	-8.567	0.699	6.018	4.964	-7.081	4.37
Percentage of IncreaseDecreaseInAccruedIncomeTaxesPayable	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	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:IncreaseDecreaseInAccruedLiabilities

Period End	2021-07-01	2021-04-01	2020-12-31	2020-09-24	2020-06-25	2020-03-26	2019-12-26	2019-09-26	2019-06-27	2019-03-28	2018-12-27	2018-09-27	2018-06-28	2018-03-29	2017-12-28	2017-09-28	2017-06-29	2017-03-30	2016-12-29	2016-09-29	2016-06-30	2016-03-31
Value	-2.861	-16.204	18	40	2.736	-2.478	-5.465	17	6.041	3.017	0.621	19	-8.986	-12.926	12	7.804	-3.828	-7.073	-0.355	11	14	2.237
Percentage of IncreaseDecreaseInAccruedLiabilities	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	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:IncreaseDecreaseInContractWithCustomerLiability

Period End	2021-07-01	2021-04-01	2020-12-31	2020-09-24	2020-06-25	2020-03-26	2019-12-26	2019-09-26	2019-06-27	2019-03-28	2018-12-27	2018-09-27	2018-06-28	2018-03-29	2017-12-28	2017-09-28
Value	6.221	5.544	-0.738	2.466	1.198	0.506	-2.14	1.856	0.386	1.337	0.196	0.365	0.941	1.5	-3.078	4.082
Percentage of IncreaseDecreaseInContractWithCustomerLiability	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	100.0	100.0	100.0

us-gaap:IncreaseDecreaseInOtherOperatingLiabilities

Period End	2021-07-01	2021-04-01	2020-12-31	2020-09-24	2020-06-25	2020-03-26	2019-12-26	2019-09-26	2019-06-27	2019-03-28	2018-12-27	2018-09-27	2018-06-28	2018-03-29	2017-12-28	2017-09-28	2017-06-29	2017-03-30	2016-12-29	2016-09-29	2016-06-30	2016-03-31
Value	-1.18	-24.476	2.067	-0.73	25	-6.296	9.514	16	9.034	-12.256	-0.149	0.063	-0.584	2.486	0.176	0.024	0.035	0.024	0.013	0.012	0.024	0.026
Percentage of IncreaseDecreaseInOtherOperatingLiabilities	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	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:IncreaseDecreaseInReceivables

Period End	2021-07-01	2021-04-01	2020-12-31	2020-09-24	2020-06-25	2020-03-26	2019-12-26	2019-09-26	2019-06-27	2019-03-28	2018-12-27	2018-09-27	2018-06-28	2018-03-29	2017-12-28	2017-09-28	2017-06-29	2017-03-30	2016-12-29	2016-09-29	2016-06-30	2016-03-31
Value	1.534	9.575	-4.866	1.175	3.557	-18.74	24	9.643	6.759	-22.568	11	14	3.078	-15.775	5.426	10	5.117	-1.15	-0.023	10	5.67	-5.135
Percentage of IncreaseDecreaseInReceivables	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	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:IncrementalCommonSharesAttributableToShareBasedPaymentArrangements

Period End	2021-07-01	2021-04-01	2020-12-31	2020-09-24	2020-06-25	2020-03-26	2019-12-26	2019-09-26	2019-06-27	2019-03-28	2018-12-27	2018-09-27	2018-06-28	2018-03-29	2017-12-28	2017-09-28	2017-06-29	2017-03-30	2016-12-29	2016-09-29	2016-06-30	2016-03-31
Value	2721000.0	3026000.0	-48000.0	3199000.0	3352000.0	3881000.0	-430000.0	5043000.0	6198000.0	6536000.0	-394000.0	7311000.0	8253000.0	8951000.0	256730.0	9460400.0	9057700.0	5116.0	152710.0	4911700.0	4513100.0	3293.0
Percentage of IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	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	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:IndefinitelivedIntangibleAssetsAcquired us-gaap:BusinessAcquisition, us-gaap:IndefiniteLivedIntangibleAssetsByMajorClass

us-gaap:IndefinitelivedIntangibleAssetsAcquired

fnd:SpartanSurfacesInc, us-gaap:TrademarksAndTradeNames

Period End	2021-06-04
Value	9200000.0
Percentage of IndefinitelivedIntangibleAssetsAcquired	100.0

us-gaap:InterestCostsCapitalizedAdjustment

Period End	2021-07-01	2021-04-01	2020-06-25	2020-03-26
Value	569000.0	581000.0	89000.0	227000.0
Percentage of InterestCostsCapitalizedAdjustment	100.0	100.0	100.0	100.0

us-gaap:InterestCostsIncurred

Period End	2021-07-01	2021-04-01	2020-06-25	2020-03-26
Value	1862000.0	1969000.0	2392000.0	2034000.0
Percentage of InterestCostsIncurred	100.0	100.0	100.0	100.0

us-gaap:LeaseCost

Period End	2021-07-01	2021-04-01	2020-12-31	2020-09-24	2020-06-25	2020-03-26	2019-12-26	2019-09-26	2019-06-27	2019-03-28
Value	50	47	75	34	33	33	59	33	28	25
Percentage of LeaseCost	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:OperatingLeaseCost

Period End	2021-07-01	2021-04-01	2020-06-25	2020-03-26	2019-12-26	2019-09-26	2019-06-27	2019-03-28
Value	40	37	34	33	27	29	28	26
Percentage of OperatingLeaseCost	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:OperatingLeaseCost us-gaap:IncomeStatementLocation

fnd:PreOpeningCosts

Period End	2021-07-01	2021-04-01	2020-12-31	2020-09-24	2020-06-25	2020-03-26	2019-12-26	2019-09-26
Value	3.02	1.635	1.783	2.23	1.683	2.191	1.046	1.988
Percentage of OperatingLeaseCost	7.5	4.4	0.0	0.0	4.9	6.5	3.8	6.6

us-gaap:CostOfSales

Period End	2021-07-01	2021-04-01	2020-12-31	2020-09-24	2020-06-25	2020-03-26	2019-12-26	2019-09-26
Value	5.656	5.66	5.667	5.676	5.655	5.674	5.136	4.005
Percentage of OperatingLeaseCost	14.0	15.3	0.0	0.0	16.5	16.8	18.6	13.4

us-gaap:GeneralAndAdministrativeExpense

Period End	2021-07-01	2021-04-01	2020-12-31	2020-09-24	2020-06-25	2020-03-26	2019-12-26	2019-09-26
Value	1.03	1.029	1.03	1.029	1.041	1.018	-0.44	1.016
Percentage of OperatingLeaseCost	2.5	2.8	0.0	0.0	3.0	3.0	-1.6	3.4

us-gaap:SellingAndMarketingExpense

Period End	2021-07-01	2021-04-01	2020-12-31	2020-09-24	2020-06-25	2020-03-26	2019-12-26	2019-09-26
Value	30	28	27	26	25	24	21	22
Percentage of OperatingLeaseCost	76.0	77.6	0.0	0.0	75.5	73.7	79.2	76.6

us-gaap:OperatingLeasePayments

Period End	2021-07-01	2021-04-01	2020-12-31	2020-09-24	2020-06-25	2020-03-26	2019-12-26	2019-09-26
Value	38	50	38	32	27	32	32	27
Percentage of OperatingLeasePayments	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax

Period End	2021-07-01	2021-04-01	2020-12-31	2020-09-24	2020-06-25	2020-03-26	2019-12-26	2019-09-26	2019-06-27	2019-03-28
Value	-7000.0	83000.0	108000.0	89000.0	92000.0	68000.0	168000.0	0	-213000.0	-334000.0
Percentage of OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax	100.0	100.0	100.0	100.0	100.0	100.0	100.0	0.0	100.0	100.0

us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax us-gaap:StatementEquityComponents

us-gaap:AccumulatedOtherComprehensiveIncome

Period End	2021-07-01	2021-04-01	2020-09-24	2020-06-25	2020-03-26	2019-06-27	2019-03-28
Value	-7000.0	83000.0	89000.0	92000.0	68000.0	-213000.0	-334000.0
Percentage of OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:PaymentsOfDebtIssuanceCosts

Period End	2021-07-01	2021-04-01	2020-12-31	2020-09-24	2020-06-25	2020-03-26	2019-06-27	2019-03-28	2018-12-27	2018-09-27	2017-12-28	2017-09-28	2017-06-29	2017-03-30	2016-12-29	2016-09-29	2016-06-30	2016-03-31
Value	0.0	1.409	0.0	0.0	4.453	2.429	0.0	0.0	0.17	0.0	0.566	0.0	0.993	0.0	10	0.002	0.18	0.017
Percentage of PaymentsOfDebtIssuanceCosts	0.0	100.0	0.0	0.0	100.0	100.0	0.0	0.0	100.0	0.0	100.0	0.0	100.0	0.0	100.0	100.0	100.0	100.0

us-gaap:PaymentsOfDebtRestructuringCosts us-gaap:DebtInstrument

us-gaap:PaymentsOfDebtRestructuringCosts

fnd:TermLoanFacility

Period End	2021-02-09
Value	1600000.0
Percentage of PaymentsOfDebtRestructuringCosts	100.0

us-gaap:PaymentsRelatedToTaxWithholdingForShareBasedCompensation

Period End	2021-07-01	2021-04-01
Value	50000.0	966000.0
Percentage of PaymentsRelatedToTaxWithholdingForShareBasedCompensation	100.0	100.0

us-gaap:PaymentsToAcquireBusinessesNetOfCashAcquired us-gaap:BusinessAcquisition

us-gaap:PaymentsToAcquireBusinessesNetOfCashAcquired

fnd:SpartanSurfacesInc

Period End	2021-06-04
Value	63
Percentage of PaymentsToAcquireBusinessesNetOfCashAcquired	100.0

us-gaap:PreOpeningCosts

Period End	2021-07-01	2021-04-01	2020-12-31	2020-09-24	2020-06-25	2020-03-26	2019-12-26	2019-09-26	2019-06-27	2019-03-28	2018-12-27	2018-09-27	2018-06-28	2018-03-29	2017-12-28	2017-09-28	2017-06-29	2017-03-30	2016-12-29	2016-09-29	2016-06-30	2016-03-31
Value	8.99	6.997	7.604	5.027	3.433	5.434	6.014	8.184	6.369	4.027	8.253	8.33	6.588	2.974	2.66	6.7	2.958	4.167	2.743	5.046	2.627	3.316
Percentage of PreOpeningCosts	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	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:ProceedsFromIssuanceOfSecuredDebt

Period End	2021-07-01	2021-04-01	2020-12-31	2020-09-24	2017-09-28	2016-09-29
Value	0.0	65	0.0	0.0	0.0	0.0
Percentage of ProceedsFromIssuanceOfSecuredDebt	0.0	100.0	0.0	0.0	0.0	0.0

us-gaap:ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlans

Period End	2021-07-01	2021-04-01	2020-12-31	2020-09-24	2020-06-25	2020-03-26	2019-12-26	2019-09-26	2019-06-27	2019-03-28	2018-09-27	2018-06-28	2018-03-29
Value	1761000.0	1302000.0	0	1213000.0	0	1131000.0	0	1026000.0	0	1419000.0	0	0	0
Percentage of ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlans	100.0	100.0	0.0	100.0	0.0	100.0	0.0	100.0	0.0	100.0	0.0	0.0	0.0

us-gaap:ProceedsFromLongTermLinesOfCredit

Period End	2020-12-31	2020-09-24	2020-06-25	2020-03-26	2019-12-26	2019-09-26	2019-06-27	2019-03-28	2018-12-27	2018-09-27	2018-06-28	2018-03-29	2017-12-28	2017-09-28	2017-06-29	2017-03-30	2016-12-29	2016-09-29	2016-06-30	2016-03-31
Value	0.0	0.0	0.0	275	0.0	4.8	15	80	13	74	77	51	61	63	86	25	37	45	43	46
Percentage of ProceedsFromLongTermLinesOfCredit	0.0	0.0	0.0	100.0	0.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:ProceedsFromStockOptionsExercised

Period End	2021-07-01	2021-04-01	2020-12-31	2020-09-24	2020-06-25	2020-03-26	2019-12-26	2019-09-26	2019-06-27	2019-03-28	2018-12-27	2018-09-27	2018-06-28	2018-03-29	2017-12-28	2017-09-28	2017-06-29	2017-03-30	2016-12-29	2016-09-29	2016-06-30	2016-03-31
Value	3.943	2.383	4.061	6.533	4.877	3.783	3.735	7.911	5.376	1.776	1.232	0.643	5.461	3.195	4.547	2.472	1.759	0.096	-0.054	0.304	0.0	0.034
Percentage of ProceedsFromStockOptionsExercised	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	100.0	100.0	100.0	100.0	100.0	100.0	100.0	0.0	100.0

us-gaap:RepaymentsOfLongTermLinesOfCredit

Period End	2020-12-31	2020-09-24	2020-06-25	2020-03-26	2019-12-26	2019-09-26	2019-06-27	2019-03-28	2018-12-27	2018-09-27	2018-06-28	2018-03-29	2017-12-28	2017-09-28	2017-06-29	2017-03-30	2016-12-29	2016-09-29	2016-06-30	2016-03-31
Value	0.0	0.0	275	0.0	0.0	4.8	17	78	13	88	90	66	58	57	69	60	50	51	62	51
Percentage of RepaymentsOfLongTermLinesOfCredit	0.0	0.0	100.0	0.0	0.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:RepaymentsOfSecuredDebt

Period End	2021-07-01	2021-04-01	2020-12-31	2020-09-24	2020-06-25	2020-03-26	2019-12-26	2019-09-26	2019-06-27	2019-03-28	2018-12-27	2018-09-27	2018-06-28	2018-03-29	2017-12-28	2017-09-28	2017-05-02	2017-06-29	2017-03-30	2016-12-29	2016-09-29	2016-06-30	2016-03-31
Value	0.525	75	1.099	0.361	0.362	0.875	0.875	0.875	0.875	0.875	0.875	0.875	0.0	1.75	0.875	0.875	192	194	0.875	97	0.167	0.366	0.367
Percentage of RepaymentsOfSecuredDebt	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	0.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability

Period End	2021-07-01	2021-04-01	2020-12-31	2020-09-24	2020-06-25	2020-03-26	2019-12-26	2019-09-26	2019-06-27	2019-03-28	2018-09-27	2018-06-28	2018-03-29
Value	131	53	48	38	28	63	99	45	79	53	0.0	0.0	0.0
Percentage of RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	0.0	0.0	0.0

us-gaap:SellingExpense

Period End	2021-07-01	2021-04-01	2020-12-31	2020-09-24	2020-06-25	2020-03-26	2019-12-26	2019-09-26	2019-06-27	2019-03-28	2018-12-27	2018-09-27	2018-06-28	2018-03-29	2017-12-28	2017-09-28	2017-06-29	2017-03-30	2016-12-29	2016-09-29	2016-06-30	2016-03-31
Value	205	189	191	171	138	153	147	136	134	127	119	109	108	102	102	85	85	80	74	68	66	62
Percentage of SellingExpense	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	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue us-gaap:AwardType

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue

us-gaap:RestrictedStock

Period End	2020-09-24	2020-06-25	2020-03-26
Value	0	-0.04	53.89
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	0.0	100.0	100.0

us-gaap:RestrictedStockUnitsRSU

Period End	2020-12-31	2020-09-24	2020-06-25	2020-03-26
Value	-56831.0	56833.0	-0.94	57.7
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	0.0	0.0	2350.0	107.1

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate us-gaap:AwardType

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate

us-gaap:EmployeeStockOption

Period End	2021-07-01	2021-04-01	2020-12-31	2020-03-26
Value	0	48.1	0.3	0.384
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate	0.0	100.0	100.0	100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate us-gaap:AwardType

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate

us-gaap:EmployeeStockOption

Period End	2021-07-01	2021-04-01	2020-12-31	2020-03-26
Value	0	0.8	-0.04	0.0124
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate	0.0	100.0	100.0	100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice

Period End	2021-07-01	2021-04-01	2020-12-31
Value	-4.29	44.2	0.61
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice	100.0	100.0	100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue

Period End	2020-12-31
Value	0.46
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue us-gaap:AwardType

us-gaap:EmployeeStockOption

Period End	2021-07-01	2021-04-01
Value	0	41.75
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	0.0	0.0

us-gaap:ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice

Period End	2021-07-01	2021-04-01	2020-12-31
Value	-1.74	12.22	0.26
Percentage of ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice	100.0	100.0	100.0

us-gaap:ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice

Period End	2021-07-01	2021-04-01	2020-12-31
Value	0	95.68	0.9
Percentage of ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice	0.0	100.0	100.0

us-gaap:SharesPaidForTaxWithholdingForShareBasedCompensation us-gaap:StatementClassOfStock, us-gaap:StatementEquityComponents

us-gaap:SharesPaidForTaxWithholdingForShareBasedCompensation

us-gaap:CommonClassA, us-gaap:CommonStock

Period End	2021-07-01	2021-04-01
Value	1000.0	10000.0
Percentage of SharesPaidForTaxWithholdingForShareBasedCompensation	100.0	100.0

us-gaap:StockIssuedDuringPeriodSharesAcquisitions us-gaap:StatementClassOfStock, us-gaap:StatementEquityComponents

us-gaap:StockIssuedDuringPeriodSharesAcquisitions

us-gaap:CommonClassA, us-gaap:CommonStock

Period End	2021-07-01
Value	50000.0
Percentage of StockIssuedDuringPeriodSharesAcquisitions	100.0

us-gaap:StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans us-gaap:StatementClassOfStock, us-gaap:StatementEquityComponents

us-gaap:StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans

us-gaap:CommonClassA, us-gaap:CommonStock

Period End	2021-07-01	2021-04-01	2020-09-24	2020-03-26	2019-09-26	2019-03-28
Value	21000.0	26000.0	27000.0	30000.0	43000.0	61000.0
Percentage of StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:StockIssuedDuringPeriodSharesRestrictedStockAwardForfeited us-gaap:StatementClassOfStock, us-gaap:StatementEquityComponents

us-gaap:StockIssuedDuringPeriodSharesRestrictedStockAwardForfeited

us-gaap:CommonClassA, us-gaap:CommonStock

Period End	2021-04-01
Value	2000.0
Percentage of StockIssuedDuringPeriodSharesRestrictedStockAwardForfeited	100.0

us-gaap:StockIssuedDuringPeriodSharesRestrictedStockAwardGross us-gaap:StatementClassOfStock, us-gaap:StatementEquityComponents

us-gaap:StockIssuedDuringPeriodSharesRestrictedStockAwardGross

us-gaap:CommonClassA, us-gaap:CommonStock

Period End	2021-07-01	2021-04-01	2020-03-26
Value	2000.0	27000.0	368000.0
Percentage of StockIssuedDuringPeriodSharesRestrictedStockAwardGross	100.0	100.0	100.0

us-gaap:StockIssuedDuringPeriodSharesShareBasedCompensation us-gaap:StatementClassOfStock, us-gaap:StatementEquityComponents

us-gaap:StockIssuedDuringPeriodSharesShareBasedCompensation

us-gaap:CommonClassA, us-gaap:CommonStock

Period End	2021-07-01	2021-04-01	2019-06-27	2019-03-28
Value	2000.0	25000.0	0	0
Percentage of StockIssuedDuringPeriodSharesShareBasedCompensation	100.0	100.0	0.0	0.0

us-gaap:StockIssuedDuringPeriodSharesStockOptionsExercised us-gaap:StatementClassOfStock, us-gaap:StatementEquityComponents

us-gaap:StockIssuedDuringPeriodSharesStockOptionsExercised

us-gaap:CommonClassA, us-gaap:CommonStock

Period End	2021-07-01	2021-04-01	2020-09-24	2020-06-25	2020-03-26	2019-09-26	2019-06-27	2019-03-28	2018-09-27	2018-06-28	2018-03-29
Value	409000.0	195000.0	735000.0	838000.0	453000.0	1871000.0	1090000.0	348000.0	108000.0	1124000.0	585000.0
Percentage of StockIssuedDuringPeriodSharesStockOptionsExercised	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:StockIssuedDuringPeriodValueAcquisitions

Period End	2021-07-01
Value	5000000.0
Percentage of StockIssuedDuringPeriodValueAcquisitions	100.0

us-gaap:StockIssuedDuringPeriodValueAcquisitions us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital

Period End	2021-07-01
Value	5000000.0
Percentage of StockIssuedDuringPeriodValueAcquisitions	100.0

us-gaap:StockIssuedDuringPeriodValueEmployeeStockPurchasePlan

Period End	2021-07-01	2021-04-01	2020-09-24	2020-03-26	2019-09-26	2018-12-31	2019-03-28
Value	1761000.0	1302000.0	1213000.0	1131000.0	1026000.0	1400000.0	1419000.0
Percentage of StockIssuedDuringPeriodValueEmployeeStockPurchasePlan	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:StockIssuedDuringPeriodValueEmployeeStockPurchasePlan us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital

Period End	2021-07-01	2021-04-01	2020-09-24	2020-03-26	2019-09-26	2019-03-28
Value	1761000.0	1302000.0	1213000.0	1131000.0	1026000.0	1419000.0
Percentage of StockIssuedDuringPeriodValueEmployeeStockPurchasePlan	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:StockIssuedDuringPeriodValueStockOptionsExercised

Period End	2021-07-01	2021-04-01	2020-09-24	2020-06-25	2020-03-26	2019-09-26	2019-06-27	2019-03-28	2018-09-27	2018-06-28	2018-03-29
Value	3.943	2.383	6.533	4.877	3.783	7.91	5.376	1.776	0.644	5.46	3.195
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

us-gaap:StockIssuedDuringPeriodValueStockOptionsExercised us-gaap:StatementClassOfStock, us-gaap:StatementEquityComponents

us-gaap:CommonClassA, us-gaap:CommonStock

Period End	2021-04-01	2020-09-24	2020-06-25	2020-03-26	2019-09-26	2019-06-27	2019-03-28	2018-06-28
Value	0.001	0.001	0.001	0.001	0.002	0.001	0.0	0.001
Percentage of StockIssuedDuringPeriodValueStockOptionsExercised	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0

us-gaap:StockIssuedDuringPeriodValueStockOptionsExercised us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital

Period End	2021-07-01	2021-04-01	2020-09-24	2020-06-25	2020-03-26	2019-09-26	2019-06-27	2019-03-28	2018-09-27	2018-06-28	2018-03-29
Value	3.943	2.382	6.532	4.876	3.782	7.908	5.375	1.776	0.644	5.459	3.195
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

us-gaap:SubleaseIncome

Period End	2021-07-01	2021-04-01	2020-12-31	2020-09-24	2020-06-25	2020-03-26	2019-12-26	2019-09-26	2019-06-27	2019-03-28
Value	597000.0	597000.0	922000.0	597000.0	597000.0	597000.0	597000.0	588000.0	606000.0	623000.0
Percentage of SubleaseIncome	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:UnrecognizedTaxBenefitsPeriodIncreaseDecrease

Period End	2020-09-24	2020-06-25	2020-03-26	2019-09-26	2019-06-27	2019-03-28
Value	300000.0	0	2200000.0	0	-100000.0	100000.0
Percentage of UnrecognizedTaxBenefitsPeriodIncreaseDecrease	100.0	0.0	100.0	0.0	100.0	100.0

us-gaap:VariableLeaseCost

Period End	2021-07-01	2021-04-01	2020-06-25	2020-03-26
Value	11	11	10	9.133
Percentage of VariableLeaseCost	100.0	100.0	100.0	100.0

us-gaap:VariableLeaseCost us-gaap:IncomeStatementLocation

fnd:PreOpeningCosts

Period End	2021-07-01	2021-04-01	2020-06-25	2020-03-26
Value	0.002	0.068	0.085	0.084
Percentage of VariableLeaseCost	0.0	0.6	0.8	0.9

us-gaap:CostOfSales

Period End	2021-07-01	2021-04-01	2020-06-25	2020-03-26
Value	1.184	1.408	1.135	1.084
Percentage of VariableLeaseCost	10.7	12.5	10.9	11.9

us-gaap:GeneralAndAdministrativeExpense

Period End	2021-07-01	2021-04-01	2020-06-25	2020-03-26
Value	-0.11	0.022	0.045	0.027
Percentage of VariableLeaseCost	-1.0	0.2	0.4	0.3

us-gaap:SellingAndMarketingExpense

Period End	2021-07-01	2021-04-01	2020-06-25	2020-03-26
Value	9.975	9.776	9.181	7.938
Percentage of VariableLeaseCost	90.3	86.7	87.9	86.9

fnd:AccountsAndOtherReceivablesNetCurrentExpectedRecoveries

Period End	2020-12-31
Value	24
Percentage of AccountsAndOtherReceivablesNetCurrentExpectedRecoveries	100.0

fnd:AccruedConstructionInProgressCosts

Period End	2020-12-31	2019-12-26	2018-12-27
Value	20	10	9.421
Percentage of AccruedConstructionInProgressCosts	100.0	100.0	100.0

fnd:AccruedLoyaltyProgramLiability

Period End	2020-12-31	2019-12-26	2018-12-27
Value	12	6.649	2.274
Percentage of AccruedLoyaltyProgramLiability	100.0	100.0	100.0

fnd:AccruedSalariesAndPayrollTaxes

Period End	2020-12-31	2019-12-26	2018-12-27
Value	22	8.328	6.936
Percentage of AccruedSalariesAndPayrollTaxes	100.0	100.0	100.0

fnd:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAndGoodwill us-gaap:BusinessAcquisition

fnd:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAndGoodwill

fnd:SpartanSurfacesInc

Period End	2021-06-04
Value	93
Percentage of BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAndGoodwill	100.0

fnd:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedRightOfUseAssets us-gaap:BusinessAcquisition

fnd:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedRightOfUseAssets

fnd:SpartanSurfacesInc

Period End	2021-06-04
Value	3300000.0
Percentage of BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedRightOfUseAssets	100.0

fnd:ContractWithCustomerLiabilityDeferredRevenueCurrent

Period End	2020-09-24	2019-12-26
Value	10	6.7
Percentage of ContractWithCustomerLiabilityDeferredRevenueCurrent	100.0	100.0

fnd:ContractWithCustomerLiabilityLoyaltyProgramCurrent

Period End	2020-09-24	2019-12-26
Value	10	6.6
Percentage of ContractWithCustomerLiabilityLoyaltyProgramCurrent	100.0	100.0

fnd:ContractWithCustomerLiabilityNoncurrentLoyaltyProgram

Period End	2021-07-01	2021-04-01	2020-12-31	2019-12-26
Value	16	13	12	6.6
Percentage of ContractWithCustomerLiabilityNoncurrentLoyaltyProgram	100.0	100.0	100.0	100.0

fnd:ContractWithCustomerLiabilityNoncurrentUnredeemedGiftCards

Period End	2021-07-01	2021-04-01	2020-12-31	2019-12-26
Value	3100000.0	2800000.0	2600000.0	2200000.0
Percentage of ContractWithCustomerLiabilityNoncurrentUnredeemedGiftCards	100.0	100.0	100.0	100.0

fnd:DebtInstrumentCarryingAmountCurrent

Period End	2021-04-01	2020-12-31	2018-12-27	2017-12-28	2016-12-29
Value	2103000.0	1647000.0	3500000.0	3500000.0	3500000.0
Percentage of DebtInstrumentCarryingAmountCurrent	100.0	100.0	100.0	100.0	100.0

fnd:DebtInstrumentCarryingAmountNoncurrent

Period End	2021-04-01	2020-12-31	2019-12-26	2018-12-27	2017-12-28	2016-12-29
Value	205	216	145	145	190	396
Percentage of DebtInstrumentCarryingAmountNoncurrent	100.0	100.0	100.0	100.0	100.0	100.0

fnd:DeferredEmployerSocialSecurityTaxesPayable

Period End	2020-09-24	2020-06-25
Value	7.1	3.1
Percentage of DeferredEmployerSocialSecurityTaxesPayable	100.0	100.0

fnd:DeferredTaxAssetsIntangibleAssetsExcludingGoodwill

Period End	2020-12-31	2019-12-26	2018-12-27
Value	268000.0	313000.0	361000.0
Percentage of DeferredTaxAssetsIntangibleAssetsExcludingGoodwill	100.0	100.0	100.0

fnd:DeferredTaxAssetsLeaseLiabilities

Period End	2020-12-31	2019-12-26
Value	259	233
Percentage of DeferredTaxAssetsLeaseLiabilities	100.0	100.0

fnd:DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsGiftCardLiability

Period End	2020-12-31	2019-12-26	2018-12-27	2017-12-28	2016-12-29
Value	557000.0	453000.0	242000.0	648000.0	858000.0
Percentage of DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsGiftCardLiability	100.0	100.0	100.0	100.0	100.0

fnd:ExposureToCreditRiskFromCustomers

Period End	2020-12-31	2019-12-26	2018-12-27
Value	1200000.0	1045000.0	251000.0
Percentage of ExposureToCreditRiskFromCustomers	100.0	100.0	100.0

fnd:LesseeOperatingLeaseLeaseNotYetCommencedAmount

Period End	2021-07-01	2021-04-01	2020-12-31	2020-09-24
Value	25	108	132	47
Percentage of LesseeOperatingLeaseLeaseNotYetCommencedAmount	100.0	100.0	100.0	100.0

fnd:LesseeOperatingLeaseLiabilityToBePaidDueAfterYearFour

Period End	2021-07-01	2021-04-01	2020-09-24
Value	858	748	663
Percentage of LesseeOperatingLeaseLiabilityToBePaidDueAfterYearFour	100.0	100.0	100.0

fnd:LesseeOperatingLeaseOptionToExtendAmount

Period End	2021-07-01	2021-04-01	2020-12-31
Value	82	67	59
Percentage of LesseeOperatingLeaseOptionToExtendAmount	100.0	100.0	100.0

fnd:LongTermDebtGrossExcludingCurrentMaturities

Period End	2021-07-01	2020-12-31
Value	205	216
Percentage of LongTermDebtGrossExcludingCurrentMaturities	100.0	100.0

fnd:LongTermDebtMaturityAfterYearFour

Period End	2021-07-01	2021-04-01	2020-09-24	2020-06-25
Value	197	197	209	209
Percentage of LongTermDebtMaturityAfterYearFour	100.0	100.0	100.0	100.0

fnd:ReceivablesExcludingIncomeTaxesNetCurrent

Period End	2021-07-01	2021-04-01	2020-12-31	2020-09-24	2020-06-25	2020-03-26	2019-12-26	2018-12-27
Value	72	60	50	55	54	50	69	67
Percentage of ReceivablesExcludingIncomeTaxesNetCurrent	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

fnd:RentPaymentsDelayedOrDeferred

Period End	2020-12-31	2020-09-24	2020-06-25
Value	5500000.0	8100000.0	5900000.0
Percentage of RentPaymentsDelayedOrDeferred	100.0	100.0	100.0

fnd:RentPaymentsDelayedOrDeferred us-gaap:BalanceSheetLocation

fnd:OperatingLeaseLiabilityCurrent

Period End	2020-12-31	2020-09-24	2020-06-25
Value	4500000.0	7100000.0	4900000.0
Percentage of RentPaymentsDelayedOrDeferred	81.8	87.7	83.1

fnd:SocialSecurityTaxEmployerDeferralCARESAct

Period End	2020-12-31
Value	12
Percentage of SocialSecurityTaxEmployerDeferralCARESAct	100.0

fnd:SocialSecurityTaxEmployerDeferralCARESAct us-gaap:BalanceSheetLocation

us-gaap:AccruedLiabilities

Period End	2020-12-31
Value	6.1
Percentage of SocialSecurityTaxEmployerDeferralCARESAct	50.4

us-gaap:OtherLiabilities

Period End	2020-12-31
Value	6.0
Percentage of SocialSecurityTaxEmployerDeferralCARESAct	49.6

us-gaap:AccountsAndOtherReceivablesNetCurrent

Period End	2020-12-31	2019-12-26
Value	11	19
Percentage of AccountsAndOtherReceivablesNetCurrent	100.0	100.0

us-gaap:AccruedBonusesCurrentAndNoncurrent

Period End	2020-12-31	2019-12-26	2018-12-27
Value	24	18	12
Percentage of AccruedBonusesCurrentAndNoncurrent	100.0	100.0	100.0

us-gaap:AllowanceForDoubtfulAccountsReceivable

Period End	2020-12-31	2019-12-26	2018-12-27	2017-12-28	2017-09-28	2017-06-29	2017-03-30	2016-12-29	2016-03-31
Value	300000.0	266000.0	184000.0	349000.0	257000.0	481000.0	259000.0	188000.0	149000.0
Percentage of AllowanceForDoubtfulAccountsReceivable	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:AreaOfRealEstateProperty us-gaap:MortgageLoansOnRealEstateDescriptionTypeOfProperty

us-gaap:AreaOfRealEstateProperty

fnd:WarehouseFormatStore

Period End	2021-07-01	2021-04-01	2020-12-31	2020-09-24
Value	78000.0	78000.0	78000.0	77000.0
Percentage of AreaOfRealEstateProperty	100.0	100.0	100.0	100.0

us-gaap:BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh us-gaap:BusinessAcquisition

us-gaap:BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh

fnd:SpartanSurfacesInc

Period End	2021-06-04
Value	18
Percentage of BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh	100.0

us-gaap:BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh us-gaap:BusinessAcquisition, us-gaap:ContingentConsiderationByType

fnd:SpartanSurfacesInc, fnd:AnnualAdjustedEBITDAMarginTargets

Period End	2021-06-04
Value	9.0
Percentage of BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh	50.0

fnd:SpartanSurfacesInc, fnd:AnnualGrossProfitTargets

Period End	2021-06-04
Value	9.0
Percentage of BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh	50.0

us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCapitalLeaseObligation us-gaap:BusinessAcquisition

us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCapitalLeaseObligation

fnd:SpartanSurfacesInc

Period End	2021-06-04
Value	2725000.0
Percentage of BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCapitalLeaseObligation	100.0

us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssets us-gaap:BusinessAcquisition

us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssets

fnd:SpartanSurfacesInc

Period End	2021-06-04
Value	16
Percentage of BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssets	100.0

us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilities us-gaap:BusinessAcquisition

us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilities

fnd:SpartanSurfacesInc

Period End	2021-06-04
Value	12
Percentage of BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilities	100.0

us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill us-gaap:BusinessAcquisition

us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill

fnd:SpartanSurfacesInc

Period End	2021-06-04
Value	44
Percentage of BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill	100.0

us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities us-gaap:BusinessAcquisition

us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities

fnd:SpartanSurfacesInc

Period End	2021-06-04
Value	15
Percentage of BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities	100.0

us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther us-gaap:BusinessAcquisition

us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther

fnd:SpartanSurfacesInc

Period End	2021-06-04
Value	388000.0
Percentage of BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther	100.0

us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment us-gaap:BusinessAcquisition

us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment

fnd:SpartanSurfacesInc

Period End	2021-06-04
Value	970000.0
Percentage of BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment	100.0

us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet us-gaap:BusinessAcquisition

us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet

fnd:SpartanSurfacesInc

Period End	2021-06-04
Value	77
Percentage of BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet	100.0

us-gaap:ContractWithCustomerLiability

Period End	2021-07-01	2021-04-01	2020-12-31	2020-09-24	2019-12-26
Value	42	32	24	23	15
Percentage of ContractWithCustomerLiability	100.0	100.0	100.0	100.0	100.0

us-gaap:ContractWithCustomerRefundLiabilityCurrent

Period End	2020-12-31	2019-12-26	2018-12-27	2017-12-28
Value	22	15	8.335	7.189
Percentage of ContractWithCustomerRefundLiabilityCurrent	100.0	100.0	100.0	100.0

us-gaap:DebtInstrumentCarryingAmount

Period End	2021-04-01	2020-12-31	2020-09-24	2020-06-25	2020-03-26	2020-02-14	2019-12-26	2019-09-26	2019-06-27	2019-03-28	2018-12-27	2018-09-27	2018-06-28	2018-03-29	2017-12-28	2017-09-28	2017-06-29	2017-03-30	2016-12-29
Value	207	217	218	219	419	144	145	146	147	150	149	149	164	177	193	191	186	363	400
Percentage of DebtInstrumentCarryingAmount	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	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:DebtInstrumentCarryingAmount us-gaap:DebtInstrument

fnd:TermLoanFacility

Period End	2021-07-01	2021-04-01	2020-12-31	2020-09-24	2020-06-25	2020-03-26	2019-12-26	2018-12-27	2017-12-28	2016-09-30
Value	207	207	143	143	144	144	145	149	152	350
Percentage of DebtInstrumentCarryingAmount	0.0	100.0	65.7	65.7	65.8	34.5	100.0	100.0	78.8	0.0

fnd:TermLoanFacilityB1

Period End	2020-12-31	2020-09-24	2020-06-25	2019-12-26
Value	74	75	75	0.0
Percentage of DebtInstrumentCarryingAmount	34.3	34.3	34.2	0.0

us-gaap:DebtInstrumentFaceAmount us-gaap:DebtInstrument

us-gaap:DebtInstrumentFaceAmount

fnd:SupplementalTermLoanFacility

Period End	2021-02-09
Value	65
Percentage of DebtInstrumentFaceAmount	100.0

us-gaap:DebtInstrumentFeeAmount us-gaap:DebtInstrument

us-gaap:DebtInstrumentFeeAmount

fnd:TermLoanFacility

Period End	2021-02-09
Value	200000.0
Percentage of DebtInstrumentFeeAmount	100.0

us-gaap:DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet

Period End	2021-07-01	2021-04-01	2020-12-31	2020-09-24	2020-06-25	2020-03-26	2019-12-26	2019-09-26	2019-06-27	2019-03-28	2018-12-27	2018-09-27	2018-06-28	2018-03-29	2017-12-28	2017-09-28	2017-06-29	2017-03-30	2016-12-29
Value	9.581	10	9.0	9.364	9.728	4.491	2.894	3.087	3.28	3.473	3.666	3.859	4.052	4.245	4.438	4.056	4.225	8.915	9.257
Percentage of DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet	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	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:DebtLongtermAndShorttermCombinedAmount

Period End	2021-07-01	2020-12-31
Value	210	217
Percentage of DebtLongtermAndShorttermCombinedAmount	100.0	100.0

us-gaap:DecreaseInUnrecognizedTaxBenefitsIsReasonablyPossible

Period End	2020-12-31
Value	5400000.0
Percentage of DecreaseInUnrecognizedTaxBenefitsIsReasonablyPossible	100.0

us-gaap:DeferredFinanceCostsGross us-gaap:DebtInstrument

us-gaap:DeferredFinanceCostsGross

fnd:TermLoanFacility

Period End	2021-02-09
Value	1400000.0
Percentage of DeferredFinanceCostsGross	100.0

us-gaap:DeferredIncomeTaxLiabilities

Period End	2020-12-31	2019-12-26	2018-12-27	2017-12-28	2016-12-29
Value	320	268	60	52	65
Percentage of DeferredIncomeTaxLiabilities	100.0	100.0	100.0	100.0	100.0

us-gaap:DeferredTaxAssetsGross

Period End	2020-12-31	2019-12-26	2018-12-27	2017-12-28	2016-12-29
Value	292	249	33	25	37
Percentage of DeferredTaxAssetsGross	100.0	100.0	100.0	100.0	100.0

us-gaap:DeferredTaxAssetsInventory

Period End	2020-12-31	2019-12-26	2018-12-27	2017-12-28	2016-12-29
Value	6941000.0	5283000.0	3948000.0	4111000.0	4050000.0
Percentage of DeferredTaxAssetsInventory	100.0	100.0	100.0	100.0	100.0

us-gaap:DeferredTaxAssetsOther

Period End	2020-12-31	2019-12-26	2018-12-27	2017-12-28	2016-12-29
Value	10	3.718	2.858	0.846	0.047
Percentage of DeferredTaxAssetsOther	100.0	100.0	100.0	100.0	100.0

us-gaap:DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost

Period End	2020-12-31	2019-12-26	2018-12-27	2017-12-28	2016-12-29
Value	5979000.0	3984000.0	3684000.0	3108000.0	4179000.0
Percentage of DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost	100.0	100.0	100.0	100.0	100.0

us-gaap:DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities

Period End	2020-12-31	2019-12-26	2018-12-27	2017-12-28	2016-12-29
Value	8.293	2.82	13	8.993	14
Percentage of DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities	100.0	100.0	100.0	100.0	100.0

us-gaap:DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsLegalSettlements

Period End	2020-12-31	2019-12-26	2018-12-27	2017-12-28	2016-12-29
Value	120000.0	139000.0	172000.0	583000.0	5299000.0
Percentage of DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsLegalSettlements	100.0	100.0	100.0	100.0	100.0

us-gaap:DeferredTaxLiabilitiesLeasingArrangements

Period End	2020-12-31	2019-12-26
Value	227	203
Percentage of DeferredTaxLiabilitiesLeasingArrangements	100.0	100.0

us-gaap:DeferredTaxLiabilitiesOther

Period End	2020-12-31	2019-12-26	2018-12-27	2017-12-28	2016-12-29
Value	3560000.0	2651000.0	2976000.0	1416000.0	504000.0
Percentage of DeferredTaxLiabilitiesOther	100.0	100.0	100.0	100.0	100.0

us-gaap:DeferredTaxLiabilitiesOtherFiniteLivedAssets

Period End	2020-12-31	2019-12-26	2018-12-27	2017-12-28	2016-12-29
Value	27	26	27	26	41
Percentage of DeferredTaxLiabilitiesOtherFiniteLivedAssets	100.0	100.0	100.0	100.0	100.0

us-gaap:DeferredTaxLiabilitiesPropertyPlantAndEquipment

Period End	2020-12-31	2019-12-26	2018-12-27	2017-12-28	2016-12-29
Value	62	35	30	24	23
Percentage of DeferredTaxLiabilitiesPropertyPlantAndEquipment	100.0	100.0	100.0	100.0	100.0

us-gaap:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized us-gaap:AwardType

us-gaap:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized

us-gaap:EmployeeStockOption

Period End	2021-07-01	2021-04-01	2020-12-31	2020-09-24	2020-06-25	2020-03-26	2019-12-26	2018-12-27	2017-12-28
Value	14	16	16	17	20	22	19	26	19
Percentage of EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:RestrictedStock

Period End	2021-07-01	2021-04-01	2020-12-31	2020-09-24	2020-06-25	2020-03-26	2019-12-26	2018-12-27	2017-12-28
Value	14	15	15	16	18	20	1.093	0.489	0.27
Percentage of EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized	102.8	95.7	95.0	94.0	91.4	88.3	5.7	1.9	1.4

us-gaap:RestrictedStockUnitsRSU

Period End	2021-07-01	2021-04-01	2020-12-31	2020-09-24	2020-06-25	2020-03-26
Value	15	15	6.2	5.47	5.852	6.096
Percentage of EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized	109.2	91.5	38.8	30.5	29.0	26.8

us-gaap:FiniteLivedIntangibleAssetsAccumulatedAmortization

Period End	2020-12-31	2019-12-26	2018-12-27	2017-12-28	2016-12-29
Value	319000.0	289000.0	258000.0	226000.0	194000.0
Percentage of FiniteLivedIntangibleAssetsAccumulatedAmortization	100.0	100.0	100.0	100.0	100.0

us-gaap:FiniteLivedIntangibleAssetsAccumulatedAmortization us-gaap:FiniteLivedIntangibleAssetsByMajorClass

fnd:VendorRelationships

Period End	2020-12-31	2019-12-26	2018-12-27	2017-12-28	2016-12-29
Value	319000.0	289000.0	258000.0	226000.0	194000.0
Percentage of FiniteLivedIntangibleAssetsAccumulatedAmortization	100.0	100.0	100.0	100.0	100.0

us-gaap:IncomeTaxReceivable

Period End	2020-12-31
Value	28
Percentage of IncomeTaxReceivable	100.0

us-gaap:IncomeTaxReceivable us-gaap:StatementScenario

srt:ScenarioForecast

Period End	2020-12-25
Value	28
Percentage of IncomeTaxReceivable	0.0

us-gaap:IncomeTaxesReceivable

Period End	2020-09-24	2020-06-25	2020-03-26	2019-12-26	2019-09-26	2019-06-27	2019-03-28	2018-12-27	2018-09-27	2018-06-28	2018-03-29	2017-12-28	2017-09-28	2017-06-29	2016-12-29
Value	25	27	0.0	2.868	9.249	2.837	0.0	4.324	10	15	9.766	12	3.98	2.081	0.0
Percentage of IncomeTaxesReceivable	100.0	100.0	0.0	100.0	100.0	100.0	0.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	0.0

us-gaap:InventoryValuationReserves

Period End	2020-12-31	2019-12-26	2018-12-27	2017-12-28	2017-09-28	2017-06-29	2017-03-30	2016-12-29	2016-03-31
Value	5434000.0	4468000.0	4265000.0	2936000.0	3357000.0	2809000.0	2239000.0	2449000.0	2390000.0
Percentage of InventoryValuationReserves	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths

Period End	2021-07-01	2021-04-01	2020-12-31	2020-09-24
Value	156	141	145	139
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths	100.0	100.0	100.0	100.0

us-gaap:LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear

Period End	2021-07-01	2021-04-01	2020-09-24
Value	133	136	135
Percentage of LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear	100.0	100.0	100.0

us-gaap:LettersOfCreditOutstandingAmount us-gaap:DebtInstrument

us-gaap:LettersOfCreditOutstandingAmount

fnd:AssetBasedLoanFacility

Period End	2021-07-01
Value	21
Percentage of LettersOfCreditOutstandingAmount	100.0

us-gaap:RevolvingCreditFacility

Period End	2021-04-01	2020-12-31	2020-09-24
Value	21	21	20
Percentage of LettersOfCreditOutstandingAmount	0.0	0.0	0.0

us-gaap:LineOfCreditFacilityInterestRateAtPeriodEnd us-gaap:CreditFacility, us-gaap:DebtInstrument, us-gaap:ShortTermDebtType

us-gaap:LineOfCreditFacilityInterestRateAtPeriodEnd

us-gaap:RevolvingCreditFacility, fnd:SpartanRevolvingLineOfCreditFacility, us-gaap:LineOfCredit

Period End	2021-07-01
Value	2.63
Percentage of LineOfCreditFacilityInterestRateAtPeriodEnd	100.0

us-gaap:LineOfCreditFacilityInterestRateAtPeriodEnd us-gaap:DebtInstrument

fnd:TermLoanFacility

Period End	2021-07-01	2021-04-01	2020-12-31	2020-09-24	2020-06-25	2020-03-26	2019-12-26	2018-12-27
Value	2.1	2.12	2.15	2.2	0.022	0.036	0.0477	0.0448
Percentage of LineOfCreditFacilityInterestRateAtPeriodEnd	79.8	0.0	0.0	0.0	0.0	0.0	0.0	0.0

fnd:TermLoanFacilityB1

Period End	2020-12-31	2020-09-24	2020-06-25
Value	5.0	5.0	0.05
Percentage of LineOfCreditFacilityInterestRateAtPeriodEnd	0.0	0.0	0.0

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

us-gaap:LineOfCreditFacilityRemainingBorrowingCapacity

us-gaap:RevolvingCreditFacility, fnd:AssetBasedLoanFacility

Period End	2021-07-01
Value	370
Percentage of LineOfCreditFacilityRemainingBorrowingCapacity	100.0

us-gaap:RevolvingCreditFacility, fnd:SpartanRevolvingLineOfCreditFacility

Period End	2021-07-01
Value	4.6
Percentage of LineOfCreditFacilityRemainingBorrowingCapacity	1.2

us-gaap:LineOfCreditFacilityRemainingBorrowingCapacity us-gaap:DebtInstrument

us-gaap:RevolvingCreditFacility

Period End	2021-04-01	2020-12-31	2020-09-24
Value	370	378	357
Percentage of LineOfCreditFacilityRemainingBorrowingCapacity	0.0	0.0	0.0

us-gaap:LongTermDebtFairValue

Period End	2021-07-01	2021-04-01	2020-12-31	2020-09-24	2020-06-25	2019-12-26
Value	205	205	215	214	203	145
Percentage of LongTermDebtFairValue	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:LongTermDebtFairValue us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:FairValueInputsLevel3

Period End	2020-12-31	2020-03-26	2019-12-26	2019-09-26	2019-06-27	2019-03-28	2018-12-27	2018-09-27	2018-06-28	2018-03-29	2017-12-28	2017-09-28	2017-06-29	2017-03-30	2016-12-29
Value	215	397	145	145	146	148	147	149	164	177	193	191	186	365	400
Percentage of LongTermDebtFairValue	100.0	0.0	100.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive

Period End	2020-12-31
Value	207
Percentage of LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive	100.0

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive us-gaap:DebtInstrument

fnd:TermLoanFacility

Period End	2020-12-31
Value	136
Percentage of LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive	65.8

fnd:TermLoanFacilityB1

Period End	2020-12-31
Value	70
Percentage of LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive	34.2

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths

Period End	2021-07-01	2021-04-01	2020-12-31	2020-09-24
Value	2103000.0	2103000.0	1647000.0	1647000.0
Percentage of LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths	100.0	100.0	100.0	100.0

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive

Period End	2020-12-31
Value	2384000.0
Percentage of LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive	100.0

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour

Period End	2021-07-01	2021-04-01	2020-12-31	2020-09-24
Value	2103000.0	2103000.0	2196000.0	2196000.0
Percentage of LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour	100.0	100.0	100.0	100.0

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree

Period End	2021-07-01	2021-04-01	2020-12-31	2020-09-24
Value	2103000.0	2103000.0	2196000.0	2196000.0
Percentage of LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree	100.0	100.0	100.0	100.0

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo

Period End	2021-07-01	2021-04-01	2020-12-31	2020-09-24
Value	2103000.0	2103000.0	2196000.0	2196000.0
Percentage of LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo	100.0	100.0	100.0	100.0

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalRemainderOfFiscalYear

Period End	2021-07-01	2021-04-01	2020-09-24
Value	4417000.0	1577000.0	1098000.0
Percentage of LongTermDebtMaturitiesRepaymentsOfPrincipalRemainderOfFiscalYear	100.0	100.0	100.0

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalRemainderOfFiscalYear us-gaap:DebtInstrument

fnd:SpartanRevolvingLineOfCreditFacility

Period End	2021-07-01
Value	3366000.0
Percentage of LongTermDebtMaturitiesRepaymentsOfPrincipalRemainderOfFiscalYear	76.2

fnd:TermLoanFacility

Period End	2021-07-01
Value	1051000.0
Percentage of LongTermDebtMaturitiesRepaymentsOfPrincipalRemainderOfFiscalYear	23.8

us-gaap:LongTermLoansPayable

Period End	2021-07-01	2021-04-01	2020-12-31	2020-09-24	2020-06-25	2020-03-26	2019-12-26	2019-09-26	2019-06-27	2018-12-27
Value	195	195	207	206	206	138	142	143	140	141
Percentage of LongTermLoansPayable	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:OperatingLeaseWeightedAverageDiscountRatePercent

Period End	2021-07-01	2021-04-01	2020-12-31	2020-09-24	2020-06-25	2020-03-26	2019-12-26	2019-09-26	2019-06-27
Value	5.2	5.3	5.3	5.3	0.053	5.2	5.3	5.2	0.055
Percentage of OperatingLeaseWeightedAverageDiscountRatePercent	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:OperatingLossCarryforwards us-gaap:IncomeTaxAuthority

us-gaap:OperatingLossCarryforwards

us-gaap:StateAndLocalJurisdiction

Period End	2020-12-31
Value	3000000.0
Percentage of OperatingLossCarryforwards	100.0

us-gaap:SalesAndExciseTaxPayableCurrent

Period End	2020-12-31	2019-12-26	2018-12-27	2017-12-28
Value	21	14	12	9.171
Percentage of SalesAndExciseTaxPayableCurrent	100.0	100.0	100.0	100.0

us-gaap:SelfInsuranceReserveCurrent

Period End	2020-12-31	2019-12-26	2018-12-27	2017-12-28
Value	13	9.399	8.229	6.39
Percentage of SelfInsuranceReserveCurrent	100.0	100.0	100.0	100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue us-gaap:AwardType

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue

fnd:ServiceBasedShareAwards

Period End	2020-12-31	2019-12-26
Value	53.72	35.78
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue	100.0	100.0

fnd:TotalShareholderReturnAwards

Period End	2020-12-31
Value	44.28
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue	82.4

us-gaap:PerformanceShares

Period End	2020-12-31
Value	57.7
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue	107.4

us-gaap:RestrictedStockUnitsRSU

Period End	2020-12-31
Value	59.4
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue	110.6

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice

Period End	2021-07-01	2021-04-01	2020-12-31	2020-09-24	2019-12-26	2018-12-27	2017-12-28	2016-12-29	2015-12-31	2014-12-25
Value	17.33	15.03	13.22	11.03	8.25	5.21	4.52	4.2	4.0	3.85
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableAggregateIntrinsicValue

Period End	2020-12-31
Value	164
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableAggregateIntrinsicValue	100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingAggregateIntrinsicValue

Period End	2020-12-31
Value	269
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingAggregateIntrinsicValue	100.0

us-gaap:SharePrice

Period End	2020-08-13	2020-05-22	2019-12-26	2019-02-28	2018-12-27	2018-09-14	2018-05-29	2017-12-28	2017-11-20	2017-11-16	2017-07-25	2017-05-02
Value	67.6	44.55	50.3	37.5	26.01	37.25	45.8	49.59	36.0	36.0	40.0	21.0
Percentage of SharePrice	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:ShortTermBorrowings

Period End	2021-07-01
Value	3366000.0
Percentage of ShortTermBorrowings	100.0

us-gaap:ShortTermBorrowings us-gaap:CreditFacility, us-gaap:DebtInstrument, us-gaap:ShortTermDebtType

us-gaap:RevolvingCreditFacility, fnd:SpartanRevolvingLineOfCreditFacility, us-gaap:LineOfCredit

Period End	2021-07-01
Value	3366000.0
Percentage of ShortTermBorrowings	100.0

us-gaap:UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate

Period End	2020-12-31	2018-12-27	2017-12-28	2016-12-29	2015-12-31
Value	1900000.0	0	0	0	0
Percentage of UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	100.0	0.0	0.0	0.0	0.0

Line plots across dimensions of each concept

us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecurities
(None,)

TTM Greenblatt ROC
_
(None,)

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax
us-gaap:ProductOrService
(None,)

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax
us-gaap:ProductOrService, us-gaap:ConcentrationRiskByBenchmark, us-gaap:ConcentrationRiskByType
(None, 'us-gaap:RevenueFromContractWithCustomerProductAndServiceBenchmark', 'us-gaap:ProductConcentrationRisk')

us-gaap:StockholdersEquity
us-gaap:StatementEquityComponents
(None,)

us-gaap:PropertyPlantAndEquipmentGross
us-gaap:PropertyPlantAndEquipmentByType
(None,)

us-gaap:OperatingLeaseRightOfUseAsset
us-gaap:PropertyPlantAndEquipmentByType
(None,)

us-gaap:OperatingLeaseLiabilityCurrent
us-gaap:PropertyPlantAndEquipmentByType
(None,)

us-gaap:DeferredFinanceCostsNoncurrentNet
us-gaap:DebtInstrument
(None,)

us-gaap:OperatingLeaseLiabilityNoncurrent
us-gaap:PropertyPlantAndEquipmentByType
(None,)

us-gaap:StockholdersEquity
us-gaap:StatementEquityComponents
(None,)

FND

Table of contents

Plots across concepts

Tables

Common Stock Value

us-gaap:CommonStockValue us-gaap:StatementClassOfStock

us-gaap:CommonStockValue

us-gaap:CommonClassA

Common Stock Shares Issued

us-gaap:CommonStockSharesIssued us-gaap:StatementClassOfStock, us-gaap:StatementEquityComponents

us-gaap:CommonStockSharesIssued

us-gaap:CommonClassA, us-gaap:CommonStock

Weighted Average Number Of Diluted Shares Outstanding

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding

Weighted Average Number Of Shares Outstanding Basic

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic

Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount

us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecurities

us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount

us-gaap:EmployeeStockOption

us-gaap:RestrictedStock

us-gaap:RestrictedStockUnitsRSU

Earnings Per Share Basic

us-gaap:EarningsPerShareBasic

us-gaap:EarningsPerShareBasic

Earnings Per Share Diluted

us-gaap:EarningsPerShareDiluted

us-gaap:EarningsPerShareDiluted

Allocated Share Based Compensation Expense

us-gaap:AllocatedShareBasedCompensationExpense

us-gaap:AllocatedShareBasedCompensationExpense

Comprehensive Income Net Of Tax

us-gaap:ComprehensiveIncomeNetOfTax

us-gaap:ComprehensiveIncomeNetOfTax

Cost Of Goods And Services Sold

us-gaap:CostOfGoodsAndServicesSold

us-gaap:CostOfGoodsAndServicesSold

Cost Of Revenue

us-gaap:CostOfRevenue

us-gaap:CostOfRevenue

Gains Losses On Extinguishment Of Debt

us-gaap:GainsLossesOnExtinguishmentOfDebt

us-gaap:GainsLossesOnExtinguishmentOfDebt

General And Administrative Expense

us-gaap:GeneralAndAdministrativeExpense

us-gaap:GeneralAndAdministrativeExpense

Gross Profit

us-gaap:GrossProfit

us-gaap:GrossProfit

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

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest

Income Tax Expense Benefit

us-gaap:IncomeTaxExpenseBenefit

us-gaap:IncomeTaxExpenseBenefit

Income Taxes Paid Net

us-gaap:IncomeTaxesPaidNet

us-gaap:IncomeTaxesPaidNet

Interest Expense

us-gaap:InterestExpense

us-gaap:InterestExpense

Interest Paid Net

us-gaap:InterestPaidNet

us-gaap:InterestPaidNet

Net Income Loss

us-gaap:NetIncomeLoss

us-gaap:NetIncomeLoss

us-gaap:NetIncomeLoss us-gaap:StatementEquityComponents

us-gaap:RetainedEarnings

Operating Expenses

us-gaap:OperatingExpenses

us-gaap:OperatingExpenses

Operating Income Loss

us-gaap:OperatingIncomeLoss

us-gaap:OperatingIncomeLoss

Revenue From Contract With Customer Excluding Assessed Tax

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax