3.20.1 html 250 641 1 false 74 0 false 8 false false R1.htm 0001000 - Document - Cover page Sheet http://bjs.com/role/CoverPage Cover page Cover 1 false false R2.htm 1001000 - Statement - Consolidated Balance Sheets Sheet http://bjs.com/role/ConsolidatedBalanceSheets Consolidated Balance Sheets Statements 2 false false R3.htm 1001501 - Statement - Consolidated Balance Sheets (Parenthetical) Sheet http://bjs.com/role/ConsolidatedBalanceSheetsParenthetical Consolidated Balance Sheets (Parenthetical) Statements 3 false false R4.htm 1002000 - Statement - Consolidated Statements Of Operations And Comprehensive Income Sheet http://bjs.com/role/ConsolidatedStatementsOfOperationsAndComprehensiveIncome Consolidated Statements Of Operations And Comprehensive Income Statements 4 false false R5.htm 1002501 - Statement - Consolidated Statements Of Operations And Comprehensive Income (Parenthetical) Sheet http://bjs.com/role/ConsolidatedStatementsOfOperationsAndComprehensiveIncomeParenthetical Consolidated Statements Of Operations And Comprehensive Income (Parenthetical) Statements 5 false false R6.htm 1003000 - Statement - Consolidated Statements Of Contingently Redeemable Common Stock And Stockholders' Deficit Sheet http://bjs.com/role/ConsolidatedStatementsOfContingentlyRedeemableCommonStockAndStockholdersDeficit Consolidated Statements Of Contingently Redeemable Common Stock And Stockholders' Deficit Statements 6 false false R7.htm 1004000 - Statement - Consolidated Statements Of Cash Flows Sheet http://bjs.com/role/ConsolidatedStatementsOfCashFlows Consolidated Statements Of Cash Flows Statements 7 false false R8.htm 2101100 - Disclosure - Description of Business Sheet http://bjs.com/role/DescriptionOfBusiness Description of Business Notes 8 false false R9.htm 2102100 - Disclosure - Summary of Significant Accounting Policies Sheet http://bjs.com/role/SummaryOfSignificantAccountingPolicies Summary of Significant Accounting Policies Notes 9 false false R10.htm 2103100 - Disclosure - Related Party Transactions Sheet http://bjs.com/role/RelatedPartyTransactions Related Party Transactions Notes 10 false false R11.htm 2104100 - Disclosure - Leases Sheet http://bjs.com/role/Leases Leases Notes 11 false false R12.htm 2105100 - Disclosure - Dividend Recapitalization Sheet http://bjs.com/role/DividendRecapitalization Dividend Recapitalization Notes 12 false false R13.htm 2106100 - Disclosure - Debt and Credit Arrangements Sheet http://bjs.com/role/DebtAndCreditArrangements Debt and Credit Arrangements Notes 13 false false R14.htm 2107100 - Disclosure - Interest Expense, net Sheet http://bjs.com/role/InterestExpenseNet Interest Expense, net Notes 14 false false R15.htm 2108100 - Disclosure - Intangible Assets and Liabilities Sheet http://bjs.com/role/IntangibleAssetsAndLiabilities Intangible Assets and Liabilities Notes 15 false false R16.htm 2109100 - Disclosure - Commitments and Contingencies Sheet http://bjs.com/role/CommitmentsAndContingencies Commitments and Contingencies Notes 16 false false R17.htm 2110100 - Disclosure - Contingently Redeemable Common Stock Sheet http://bjs.com/role/ContingentlyRedeemableCommonStock Contingently Redeemable Common Stock Notes 17 false false R18.htm 2111100 - Disclosure - Stock Incentive Plans Sheet http://bjs.com/role/StockIncentivePlans Stock Incentive Plans Notes 18 false false R19.htm 2112100 - Disclosure - Income Taxes Sheet http://bjs.com/role/IncomeTaxes Income Taxes Notes 19 false false R20.htm 2113100 - Disclosure - Retirement Plans Sheet http://bjs.com/role/RetirementPlans Retirement Plans Notes 20 false false R21.htm 2114100 - Disclosure - Postretirement Medical Benefits Sheet http://bjs.com/role/PostretirementMedicalBenefits Postretirement Medical Benefits Notes 21 false false R22.htm 2115100 - Disclosure - Asset Retirement Obligations Sheet http://bjs.com/role/AssetRetirementObligations Asset Retirement Obligations Notes 22 false false R23.htm 2116100 - Disclosure - Accrued Expenses and Other Current Liabilities Sheet http://bjs.com/role/AccruedExpensesAndOtherCurrentLiabilities Accrued Expenses and Other Current Liabilities Notes 23 false false R24.htm 2117100 - Disclosure - Other Non-current Liabilities Sheet http://bjs.com/role/OtherNonCurrentLiabilities Other Non-current Liabilities Notes 24 false false R25.htm 2118100 - Disclosure - Book Overdrafts Sheet http://bjs.com/role/BookOverdrafts Book Overdrafts Notes 25 false false R26.htm 2119100 - Disclosure - Derivative Financial Instruments Sheet http://bjs.com/role/DerivativeFinancialInstruments Derivative Financial Instruments Notes 26 false false R27.htm 2120100 - Disclosure - Fair Value Measurements Sheet http://bjs.com/role/FairValueMeasurements Fair Value Measurements Notes 27 false false R28.htm 2121100 - Disclosure - Earnings Per Share Sheet http://bjs.com/role/EarningsPerShare Earnings Per Share Notes 28 false false R29.htm 2122100 - Disclosure - Condensed Financial Information of Registrant (Parent Company Only) Sheet http://bjs.com/role/CondensedFinancialInformationOfRegistrantParentCompanyOnly Condensed Financial Information of Registrant (Parent Company Only) Notes 29 false false R30.htm 2123100 - Disclosure - Selected Quarterly Financial Data (Unaudited) Sheet http://bjs.com/role/SelectedQuarterlyFinancialDataUnaudited Selected Quarterly Financial Data (Unaudited) Notes 30 false false R31.htm 2202201 - Disclosure - Summary of Significant Accounting Policies (Policies) Sheet http://bjs.com/role/SummaryOfSignificantAccountingPoliciesPolicies Summary of Significant Accounting Policies (Policies) Policies http://bjs.com/role/SummaryOfSignificantAccountingPolicies 31 false false R32.htm 2302302 - Disclosure - Summary of Significant Accounting Policies (Tables) Sheet http://bjs.com/role/SummaryOfSignificantAccountingPoliciesTables Summary of Significant Accounting Policies (Tables) Tables http://bjs.com/role/SummaryOfSignificantAccountingPolicies 32 false false R33.htm 2304301 - Disclosure - Leases (Tables) Sheet http://bjs.com/role/LeasesTables Leases (Tables) Tables http://bjs.com/role/Leases 33 false false R34.htm 2306301 - Disclosure - Debt and Credit Arrangements (Tables) Sheet http://bjs.com/role/DebtAndCreditArrangementsTables Debt and Credit Arrangements (Tables) Tables http://bjs.com/role/DebtAndCreditArrangements 34 false false R35.htm 2307301 - Disclosure - Interest Expense, net (Tables) Sheet http://bjs.com/role/InterestExpenseNetTables Interest Expense, net (Tables) Tables http://bjs.com/role/InterestExpenseNet 35 false false R36.htm 2308301 - Disclosure - Intangible Assets and Liabilities (Tables) Sheet http://bjs.com/role/IntangibleAssetsAndLiabilitiesTables Intangible Assets and Liabilities (Tables) Tables http://bjs.com/role/IntangibleAssetsAndLiabilities 36 false false R37.htm 2311301 - Disclosure - Stock Incentive Plans (Tables) Sheet http://bjs.com/role/StockIncentivePlansTables Stock Incentive Plans (Tables) Tables http://bjs.com/role/StockIncentivePlans 37 false false R38.htm 2312301 - Disclosure - Income Taxes (Tables) Sheet http://bjs.com/role/IncomeTaxesTables Income Taxes (Tables) Tables http://bjs.com/role/IncomeTaxes 38 false false R39.htm 2314301 - Disclosure - Postretirement Medical Benefits (Tables) Sheet http://bjs.com/role/PostretirementMedicalBenefitsTables Postretirement Medical Benefits (Tables) Tables http://bjs.com/role/PostretirementMedicalBenefits 39 false false R40.htm 2315301 - Disclosure - Asset Retirement Obligations (Tables) Sheet http://bjs.com/role/AssetRetirementObligationsTables Asset Retirement Obligations (Tables) Tables http://bjs.com/role/AssetRetirementObligations 40 false false R41.htm 2316301 - Disclosure - Accrued Expenses and Other Current Liabilities (Tables) Sheet http://bjs.com/role/AccruedExpensesAndOtherCurrentLiabilitiesTables Accrued Expenses and Other Current Liabilities (Tables) Tables http://bjs.com/role/AccruedExpensesAndOtherCurrentLiabilities 41 false false R42.htm 2317301 - Disclosure - Other Non-current Liabilities (Tables) Sheet http://bjs.com/role/OtherNonCurrentLiabilitiesTables Other Non-current Liabilities (Tables) Tables http://bjs.com/role/OtherNonCurrentLiabilities 42 false false R43.htm 2319301 - Disclosure - Derivative Financial Instruments (Tables) Sheet http://bjs.com/role/DerivativeFinancialInstrumentsTables Derivative Financial Instruments (Tables) Tables http://bjs.com/role/DerivativeFinancialInstruments 43 false false R44.htm 2320301 - Disclosure - Fair Value Measurements (Tables) Sheet http://bjs.com/role/FairValueMeasurementsTables Fair Value Measurements (Tables) Tables http://bjs.com/role/FairValueMeasurements 44 false false R45.htm 2321301 - Disclosure - Earnings Per Share (Tables) Sheet http://bjs.com/role/EarningsPerShareTables Earnings Per Share (Tables) Tables http://bjs.com/role/EarningsPerShare 45 false false R46.htm 2322301 - Disclosure - Condensed Financial Information of Registrant (Parent Company Only) (Tables) Sheet http://bjs.com/role/CondensedFinancialInformationOfRegistrantParentCompanyOnlyTables Condensed Financial Information of Registrant (Parent Company Only) (Tables) Tables http://bjs.com/role/CondensedFinancialInformationOfRegistrantParentCompanyOnly 46 false false R47.htm 2323301 - Disclosure - Selected Quarterly Financial Data (Unaudited) (Tables) Sheet http://bjs.com/role/SelectedQuarterlyFinancialDataUnauditedTables Selected Quarterly Financial Data (Unaudited) (Tables) Tables http://bjs.com/role/SelectedQuarterlyFinancialDataUnaudited 47 false false R48.htm 2401401 - Disclosure - Description of Business (Details) Sheet http://bjs.com/role/DescriptionOfBusinessDetails Description of Business (Details) Details http://bjs.com/role/DescriptionOfBusiness 48 false false R49.htm 2402403 - Disclosure - Summary of Significant Accounting Policies - Stock Offerings, Stock Split and Deferred Offering Costs (Details) Sheet http://bjs.com/role/SummaryOfSignificantAccountingPoliciesStockOfferingsStockSplitAndDeferredOfferingCostsDetails Summary of Significant Accounting Policies - Stock Offerings, Stock Split and Deferred Offering Costs (Details) Details 49 false false R50.htm 2402404 - Disclosure - Summary of Significant Accounting Policies - Net Sales by Category (Detail) Sheet http://bjs.com/role/SummaryOfSignificantAccountingPoliciesNetSalesByCategoryDetail Summary of Significant Accounting Policies - Net Sales by Category (Detail) Details 50 false false R51.htm 2402405 - Disclosure - Summary of Significant Accounting Policies - Concentration Risk and Accounts Receivable (Details) Sheet http://bjs.com/role/SummaryOfSignificantAccountingPoliciesConcentrationRiskAndAccountsReceivableDetails Summary of Significant Accounting Policies - Concentration Risk and Accounts Receivable (Details) Details 51 false false R52.htm 2402406 - Disclosure - Summary of Significant Accounting Policies - Long-Lived Assets and Deferred Issuance Costs (Details) Sheet http://bjs.com/role/SummaryOfSignificantAccountingPoliciesLongLivedAssetsAndDeferredIssuanceCostsDetails Summary of Significant Accounting Policies - Long-Lived Assets and Deferred Issuance Costs (Details) Details 52 false false R53.htm 2402407 - Disclosure - Summary of Significant Accounting Policies - Revenue Recognition and Related, and Advertising Costs (Details) Sheet http://bjs.com/role/SummaryOfSignificantAccountingPoliciesRevenueRecognitionAndRelatedAndAdvertisingCostsDetails Summary of Significant Accounting Policies - Revenue Recognition and Related, and Advertising Costs (Details) Details 53 false false R54.htm 2402408 - Disclosure - Summary of Significant Accounting Policies - Leases and Recently Adopted Accounting Pronouncements (Details) Sheet http://bjs.com/role/SummaryOfSignificantAccountingPoliciesLeasesAndRecentlyAdoptedAccountingPronouncementsDetails Summary of Significant Accounting Policies - Leases and Recently Adopted Accounting Pronouncements (Details) Details 54 false false R55.htm 2403401 - Disclosure - Related Party Transactions (Details) Sheet http://bjs.com/role/RelatedPartyTransactionsDetails Related Party Transactions (Details) Details http://bjs.com/role/RelatedPartyTransactions 55 false false R56.htm 2404402 - Disclosure - Leases - Additional Information (Details) Sheet http://bjs.com/role/LeasesAdditionalInformationDetails Leases - Additional Information (Details) Details 56 false false R57.htm 2404403 - Disclosure - Leases - Components of Net Lease Cost (Details) Sheet http://bjs.com/role/LeasesComponentsOfNetLeaseCostDetails Leases - Components of Net Lease Cost (Details) Details 57 false false R58.htm 2404404 - Disclosure - Leases - Weighted Average Remaining Lease Term and Discount Rate (Details) Sheet http://bjs.com/role/LeasesWeightedAverageRemainingLeaseTermAndDiscountRateDetails Leases - Weighted Average Remaining Lease Term and Discount Rate (Details) Details 58 false false R59.htm 2404405 - Disclosure - Leases - Cash Paid For Amounts Included in the Measurement of Lease Liabilities (Details) Sheet http://bjs.com/role/LeasesCashPaidForAmountsIncludedInMeasurementOfLeaseLiabilitiesDetails Leases - Cash Paid For Amounts Included in the Measurement of Lease Liabilities (Details) Details 59 false false R60.htm 2404406 - Disclosure - Leases - Maturities of Operating and Finance Lease Liabilities (Details) Sheet http://bjs.com/role/LeasesMaturitiesOfOperatingAndFinanceLeaseLiabilitiesDetails Leases - Maturities of Operating and Finance Lease Liabilities (Details) Details 60 false false R61.htm 2404407 - Disclosure - Leases - Future Minimum Payments Due (Details) Sheet http://bjs.com/role/LeasesFutureMinimumPaymentsDueDetails Leases - Future Minimum Payments Due (Details) Details 61 false false R62.htm 2405401 - Disclosure - Dividend Recapitalization (Details) Sheet http://bjs.com/role/DividendRecapitalizationDetails Dividend Recapitalization (Details) Details http://bjs.com/role/DividendRecapitalization 62 false false R63.htm 2406402 - Disclosure - Debt and Credit Arrangements - Schedule of Debt (Details) Sheet http://bjs.com/role/DebtAndCreditArrangementsScheduleOfDebtDetails Debt and Credit Arrangements - Schedule of Debt (Details) Details 63 false false R64.htm 2406403 - Disclosure - Debt and Credit Arrangements - Additional Information (Details) Sheet http://bjs.com/role/DebtAndCreditArrangementsAdditionalInformationDetails Debt and Credit Arrangements - Additional Information (Details) Details 64 false false R65.htm 2406404 - Disclosure - Debt and Credit Arrangements - Future Minimum Principal Payments (Details) Sheet http://bjs.com/role/DebtAndCreditArrangementsFutureMinimumPrincipalPaymentsDetails Debt and Credit Arrangements - Future Minimum Principal Payments (Details) Details 65 false false R66.htm 2407402 - Disclosure - Interest Expense, net (Details) Sheet http://bjs.com/role/InterestExpenseNetDetails Interest Expense, net (Details) Details http://bjs.com/role/InterestExpenseNetTables 66 false false R67.htm 2408402 - Disclosure - Intangible Assets and Liabilities - Goodwill and Intangible Assets and Liabilities (Details) Sheet http://bjs.com/role/IntangibleAssetsAndLiabilitiesGoodwillAndIntangibleAssetsAndLiabilitiesDetails Intangible Assets and Liabilities - Goodwill and Intangible Assets and Liabilities (Details) Details 67 false false R68.htm 2408403 - Disclosure - Intangible Assets and Liabilities - Additional Information (Details) Sheet http://bjs.com/role/IntangibleAssetsAndLiabilitiesAdditionalInformationDetails Intangible Assets and Liabilities - Additional Information (Details) Details 68 false false R69.htm 2408404 - Disclosure - Intangible Assets and Liabilities - Amortization Expense Related to Intangible Assets and Liabilities (Details) Sheet http://bjs.com/role/IntangibleAssetsAndLiabilitiesAmortizationExpenseRelatedToIntangibleAssetsAndLiabilitiesDetails Intangible Assets and Liabilities - Amortization Expense Related to Intangible Assets and Liabilities (Details) Details 69 false false R70.htm 2410401 - Disclosure - Contingently Redeemable Common Stock (Details) Sheet http://bjs.com/role/ContingentlyRedeemableCommonStockDetails Contingently Redeemable Common Stock (Details) Details http://bjs.com/role/ContingentlyRedeemableCommonStock 70 false false R71.htm 2411402 - Disclosure - Stock Incentive Plans - Additional Information (Details) Sheet http://bjs.com/role/StockIncentivePlansAdditionalInformationDetails Stock Incentive Plans - Additional Information (Details) Details 71 false false R72.htm 2411403 - Disclosure - Stock Incentive Plans - Weighted-Average Assumptions Used To Estimate Fair Value of Options (Details) Sheet http://bjs.com/role/StockIncentivePlansWeightedAverageAssumptionsUsedToEstimateFairValueOfOptionsDetails Stock Incentive Plans - Weighted-Average Assumptions Used To Estimate Fair Value of Options (Details) Details 72 false false R73.htm 2411404 - Disclosure - Stock Incentive Plans - Stock Option Activity (Details) Sheet http://bjs.com/role/StockIncentivePlansStockOptionActivityDetails Stock Incentive Plans - Stock Option Activity (Details) Details 73 false false R74.htm 2411405 - Disclosure - Stock Incentive Plans - Restricted Stock and Restricted Stock Units Activity (Details) Sheet http://bjs.com/role/StockIncentivePlansRestrictedStockAndRestrictedStockUnitsActivityDetails Stock Incentive Plans - Restricted Stock and Restricted Stock Units Activity (Details) Details 74 false false R75.htm 2412402 - Disclosure - Income Taxes - Provision (Benefit) for Income Taxes from Continuing Operations (Details) Sheet http://bjs.com/role/IncomeTaxesProvisionBenefitForIncomeTaxesFromContinuingOperationsDetails Income Taxes - Provision (Benefit) for Income Taxes from Continuing Operations (Details) Details 75 false false R76.htm 2412403 - Disclosure - Income Taxes - Effective Income Tax Rate Reconciliation (Details) Sheet http://bjs.com/role/IncomeTaxesEffectiveIncomeTaxRateReconciliationDetails Income Taxes - Effective Income Tax Rate Reconciliation (Details) Details 76 false false R77.htm 2412404 - Disclosure - Income Taxes - Deferred Tax Assets and Liabilities (Details) Sheet http://bjs.com/role/IncomeTaxesDeferredTaxAssetsAndLiabilitiesDetails Income Taxes - Deferred Tax Assets and Liabilities (Details) Details 77 false false R78.htm 2412405 - Disclosure - Income Taxes - Unrecognized Tax Benefits (Details) Sheet http://bjs.com/role/IncomeTaxesUnrecognizedTaxBenefitsDetails Income Taxes - Unrecognized Tax Benefits (Details) Details 78 false false R79.htm 2412406 - Disclosure - Income Taxes - Additional Information (Details) Sheet http://bjs.com/role/IncomeTaxesAdditionalInformationDetails Income Taxes - Additional Information (Details) Details 79 false false R80.htm 2413401 - Disclosure - Retirement Plans (Details) Sheet http://bjs.com/role/RetirementPlansDetails Retirement Plans (Details) Details http://bjs.com/role/RetirementPlans 80 false false R81.htm 2414402 - Disclosure - Postretirement Medical Benefits - Change in Obligation and Funded Status (Details) Sheet http://bjs.com/role/PostretirementMedicalBenefitsChangeInObligationAndFundedStatusDetails Postretirement Medical Benefits - Change in Obligation and Funded Status (Details) Details 81 false false R82.htm 2414403 - Disclosure - Postretirement Medical Benefits - Net Periodic Postretirement Benefit Cost (Details) Sheet http://bjs.com/role/PostretirementMedicalBenefitsNetPeriodicPostretirementBenefitCostDetails Postretirement Medical Benefits - Net Periodic Postretirement Benefit Cost (Details) Details 82 false false R83.htm 2414404 - Disclosure - Postretirement Medical Benefits - Change in Accumulated Other Comprehensive Income (Details) Sheet http://bjs.com/role/PostretirementMedicalBenefitsChangeInAccumulatedOtherComprehensiveIncomeDetails Postretirement Medical Benefits - Change in Accumulated Other Comprehensive Income (Details) Details 83 false false R84.htm 2414405 - Disclosure - Postretirement Medical Benefits - Weighted-Average Assumptions Used to Determine Postretirement Benefit Obligations (Details) Sheet http://bjs.com/role/PostretirementMedicalBenefitsWeightedAverageAssumptionsUsedToDeterminePostretirementBenefitObligationsDetails Postretirement Medical Benefits - Weighted-Average Assumptions Used to Determine Postretirement Benefit Obligations (Details) Details 84 false false R85.htm 2414406 - Disclosure - Postretirement Medical Benefits - Effects of One-Percentage Point Change in Assumed Health Care Cost Trend Rates (Details) Sheet http://bjs.com/role/PostretirementMedicalBenefitsEffectsOfOnePercentagePointChangeInAssumedHealthCareCostTrendRatesDetails Postretirement Medical Benefits - Effects of One-Percentage Point Change in Assumed Health Care Cost Trend Rates (Details) Details 85 false false R86.htm 2414407 - Disclosure - Postretirement Medical Benefits - Estimated Future Benefit Payments for Postretirement Plan (Details) Sheet http://bjs.com/role/PostretirementMedicalBenefitsEstimatedFutureBenefitPaymentsForPostretirementPlanDetails Postretirement Medical Benefits - Estimated Future Benefit Payments for Postretirement Plan (Details) Details 86 false false R87.htm 2414408 - Disclosure - Postretirement Medical Benefits - Additional Information (Details) Sheet http://bjs.com/role/PostretirementMedicalBenefitsAdditionalInformationDetails Postretirement Medical Benefits - Additional Information (Details) Details 87 false false R88.htm 2415402 - Disclosure - Asset Retirement Obligations (Details) Sheet http://bjs.com/role/AssetRetirementObligationsDetails Asset Retirement Obligations (Details) Details http://bjs.com/role/AssetRetirementObligationsTables 88 false false R89.htm 2416402 - Disclosure - Accrued Expenses and Other Current Liabilities - Major Components of Accrued Expenses and Other Current Liabilities (Details) Sheet http://bjs.com/role/AccruedExpensesAndOtherCurrentLiabilitiesMajorComponentsOfAccruedExpensesAndOtherCurrentLiabilitiesDetails Accrued Expenses and Other Current Liabilities - Major Components of Accrued Expenses and Other Current Liabilities (Details) Details 89 false false R90.htm 2416403 - Disclosure - Accrued Expenses and Other Current Liabilities - Deferred Membership Fee Income Activity (Details) Sheet http://bjs.com/role/AccruedExpensesAndOtherCurrentLiabilitiesDeferredMembershipFeeIncomeActivityDetails Accrued Expenses and Other Current Liabilities - Deferred Membership Fee Income Activity (Details) Details 90 false false R91.htm 2417402 - Disclosure - Other Non-current Liabilities (Details) Sheet http://bjs.com/role/OtherNonCurrentLiabilitiesDetails Other Non-current Liabilities (Details) Details http://bjs.com/role/OtherNonCurrentLiabilitiesTables 91 false false R92.htm 2418401 - Disclosure - Book Overdrafts (Details) Sheet http://bjs.com/role/BookOverdraftsDetails Book Overdrafts (Details) Details http://bjs.com/role/BookOverdrafts 92 false false R93.htm 2419402 - Disclosure - Derivative Financial Instruments - Additional Information (Details) Sheet http://bjs.com/role/DerivativeFinancialInstrumentsAdditionalInformationDetails Derivative Financial Instruments - Additional Information (Details) Details 93 false false R94.htm 2419403 - Disclosure - Derivative Financial Instruments - Fair Value and Location of Derivative Instruments (Details) Sheet http://bjs.com/role/DerivativeFinancialInstrumentsFairValueAndLocationOfDerivativeInstrumentsDetails Derivative Financial Instruments - Fair Value and Location of Derivative Instruments (Details) Details 94 false false R95.htm 2420402 - Disclosure - Fair Value Measurements (Details) Sheet http://bjs.com/role/FairValueMeasurementsDetails Fair Value Measurements (Details) Details http://bjs.com/role/FairValueMeasurementsTables 95 false false R96.htm 2421402 - Disclosure - Earnings Per Share - Reconciliation of Weighted-Average Shares Outstanding (Details) Sheet http://bjs.com/role/EarningsPerShareReconciliationOfWeightedAverageSharesOutstandingDetails Earnings Per Share - Reconciliation of Weighted-Average Shares Outstanding (Details) Details 96 false false R97.htm 2421403 - Disclosure - Earnings Per Share - Additional Information (Details) Sheet http://bjs.com/role/EarningsPerShareAdditionalInformationDetails Earnings Per Share - Additional Information (Details) Details 97 false false R98.htm 2422402 - Disclosure - Condensed Financial Information of Registrant (Parent Company Only) - Balance Sheets (Details) Sheet http://bjs.com/role/CondensedFinancialInformationOfRegistrantParentCompanyOnlyBalanceSheetsDetails Condensed Financial Information of Registrant (Parent Company Only) - Balance Sheets (Details) Details http://bjs.com/role/CondensedFinancialInformationOfRegistrantParentCompanyOnlyTables 98 false false R99.htm 2422403 - Disclosure - Condensed Financial Information of Registrant (Parent Company Only) - Balance Sheets - Additional Information (Details) Sheet http://bjs.com/role/CondensedFinancialInformationOfRegistrantParentCompanyOnlyBalanceSheetsAdditionalInformationDetails Condensed Financial Information of Registrant (Parent Company Only) - Balance Sheets - Additional Information (Details) Details http://bjs.com/role/CondensedFinancialInformationOfRegistrantParentCompanyOnlyTables 99 false false R100.htm 2422404 - Disclosure - Condensed Financial Information of Registrant (Parent Company Only) - Statements of Operations and Comprehensive Income (Details) Sheet http://bjs.com/role/CondensedFinancialInformationOfRegistrantParentCompanyOnlyStatementsOfOperationsAndComprehensiveIncomeDetails Condensed Financial Information of Registrant (Parent Company Only) - Statements of Operations and Comprehensive Income (Details) Details http://bjs.com/role/CondensedFinancialInformationOfRegistrantParentCompanyOnlyTables 100 false false R101.htm 2422405 - Disclosure - Condensed Financial Information of Registrant (Parent Company Only) - Additional Information (Details) Sheet http://bjs.com/role/CondensedFinancialInformationOfRegistrantParentCompanyOnlyAdditionalInformationDetails Condensed Financial Information of Registrant (Parent Company Only) - Additional Information (Details) Details http://bjs.com/role/CondensedFinancialInformationOfRegistrantParentCompanyOnlyTables 101 false false R102.htm 2423402 - Disclosure - Selected Quarterly Financial Data (Unaudited) (Details) Sheet http://bjs.com/role/SelectedQuarterlyFinancialDataUnauditedDetails Selected Quarterly Financial Data (Unaudited) (Details) Details http://bjs.com/role/SelectedQuarterlyFinancialDataUnauditedTables 102 false false All Reports Book All Reports bj-20200201.xml bj-20200201.xsd bj-20200201_cal.xml bj-20200201_def.xml bj-20200201_lab.xml bj-20200201_pre.xml http://xbrl.sec.gov/stpr/2018-01-31 http://fasb.org/us-gaap/2019-01-31 http://xbrl.sec.gov/dei/2019-01-31 http://fasb.org/srt/2019-01-31 true true