3.22.0.1 html 120 317 1 false 61 0 false 5 false false R1.htm 0001001 - Document - Document and Entity Information Sheet http://www.blue-bird.com/role/DocumentandEntityInformation Document and Entity Information Cover 1 false false R2.htm 1001002 - Statement - Condensed Consolidated Balance Sheets Sheet http://www.blue-bird.com/role/CondensedConsolidatedBalanceSheets Condensed Consolidated Balance Sheets Statements 2 false false R3.htm 1002003 - Statement - Condensed Consolidated Balance Sheets (Parenthetical) Sheet http://www.blue-bird.com/role/CondensedConsolidatedBalanceSheetsParenthetical Condensed Consolidated Balance Sheets (Parenthetical) Statements 3 false false R4.htm 1003004 - Statement - Condensed Consolidated Statements of Operations Sheet http://www.blue-bird.com/role/CondensedConsolidatedStatementsofOperations Condensed Consolidated Statements of Operations Statements 4 false false R5.htm 1004005 - Statement - Condensed Consolidated Statements of Comprehensive Income Sheet http://www.blue-bird.com/role/CondensedConsolidatedStatementsofComprehensiveIncome Condensed Consolidated Statements of Comprehensive Income Statements 5 false false R6.htm 1005006 - Statement - Condensed Consolidated Statements of Cash Flows Sheet http://www.blue-bird.com/role/CondensedConsolidatedStatementsofCashFlows Condensed Consolidated Statements of Cash Flows Statements 6 false false R7.htm 1006007 - Statement - Consolidated Statement of Stockholders' Deficit Statement Sheet http://www.blue-bird.com/role/ConsolidatedStatementofStockholdersDeficitStatement Consolidated Statement of Stockholders' Deficit Statement Statements 7 false false R8.htm 2101101 - Disclosure - Nature of Business and Basis of Presentation Sheet http://www.blue-bird.com/role/NatureofBusinessandBasisofPresentation Nature of Business and Basis of Presentation Notes 8 false false R9.htm 2103102 - Disclosure - Summary of Significant Accounting Policies and Recently Issued Accounting Standards Sheet http://www.blue-bird.com/role/SummaryofSignificantAccountingPoliciesandRecentlyIssuedAccountingStandards Summary of Significant Accounting Policies and Recently Issued Accounting Standards Notes 9 false false R10.htm 2104103 - Disclosure - Supplemental Financial Information Sheet http://www.blue-bird.com/role/SupplementalFinancialInformation Supplemental Financial Information Notes 10 false false R11.htm 2114104 - Disclosure - Debt Sheet http://www.blue-bird.com/role/Debt Debt Notes 11 false false R12.htm 2121105 - Disclosure - Income Taxes Sheet http://www.blue-bird.com/role/IncomeTaxes Income Taxes Notes 12 false false R13.htm 2123106 - Disclosure - Guarantees, Commitments and Contingencies Sheet http://www.blue-bird.com/role/GuaranteesCommitmentsandContingencies Guarantees, Commitments and Contingencies Notes 13 false false R14.htm 2125107 - Disclosure - Segment Information Sheet http://www.blue-bird.com/role/SegmentInformation Segment Information Notes 14 false false R15.htm 2129108 - Disclosure - Revenue Sheet http://www.blue-bird.com/role/Revenue Revenue Notes 15 false false R16.htm 2132109 - Disclosure - Earnings Per Share Sheet http://www.blue-bird.com/role/EarningsPerShare Earnings Per Share Notes 16 false false R17.htm 2136110 - Disclosure - Accumulated Other Comprehensive Loss Sheet http://www.blue-bird.com/role/AccumulatedOtherComprehensiveLoss Accumulated Other Comprehensive Loss Notes 17 false false R18.htm 2139111 - Disclosure - Stockholders' Equity (Deficit) Sheet http://www.blue-bird.com/role/StockholdersEquityDeficit Stockholders' Equity (Deficit) Notes 18 false false R19.htm 2202201 - Disclosure - Nature of Business and Basis of Presentation (Policies) Sheet http://www.blue-bird.com/role/NatureofBusinessandBasisofPresentationPolicies Nature of Business and Basis of Presentation (Policies) Policies http://www.blue-bird.com/role/SummaryofSignificantAccountingPoliciesandRecentlyIssuedAccountingStandards 19 false false R20.htm 2305301 - Disclosure - Supplemental Financial Information (Tables) Sheet http://www.blue-bird.com/role/SupplementalFinancialInformationTables Supplemental Financial Information (Tables) Tables http://www.blue-bird.com/role/SupplementalFinancialInformation 20 false false R21.htm 2315302 - Disclosure - Debt (Tables) Sheet http://www.blue-bird.com/role/DebtTables Debt (Tables) Tables http://www.blue-bird.com/role/Debt 21 false false R22.htm 2326303 - Disclosure - Segment Information (Tables) Sheet http://www.blue-bird.com/role/SegmentInformationTables Segment Information (Tables) Tables http://www.blue-bird.com/role/SegmentInformation 22 false false R23.htm 2330304 - Disclosure - Revenue (Tables) Sheet http://www.blue-bird.com/role/RevenueTables Revenue (Tables) Tables http://www.blue-bird.com/role/Revenue 23 false false R24.htm 2333305 - Disclosure - Earnings Per Share (Tables) Sheet http://www.blue-bird.com/role/EarningsPerShareTables Earnings Per Share (Tables) Tables http://www.blue-bird.com/role/EarningsPerShare 24 false false R25.htm 2337306 - Disclosure - Accumulated Other Comprehensive Loss (Tables) Sheet http://www.blue-bird.com/role/AccumulatedOtherComprehensiveLossTables Accumulated Other Comprehensive Loss (Tables) Tables http://www.blue-bird.com/role/AccumulatedOtherComprehensiveLoss 25 false false R26.htm 2406401 - Disclosure - Supplemental Financial Information - Inventories (Details) Sheet http://www.blue-bird.com/role/SupplementalFinancialInformationInventoriesDetails Supplemental Financial Information - Inventories (Details) Details 26 false false R27.htm 2407402 - Disclosure - Supplemental Financial Information - Product Warranty Rollforward (Details) Sheet http://www.blue-bird.com/role/SupplementalFinancialInformationProductWarrantyRollforwardDetails Supplemental Financial Information - Product Warranty Rollforward (Details) Details 27 false false R28.htm 2408403 - Disclosure - Supplemental Financial Information - Extended Warranty Income (Details) Sheet http://www.blue-bird.com/role/SupplementalFinancialInformationExtendedWarrantyIncomeDetails Supplemental Financial Information - Extended Warranty Income (Details) Details 28 false false R29.htm 2409404 - Disclosure - Supplemental Financial Information Remaining Performance Obligation (Details) Sheet http://www.blue-bird.com/role/SupplementalFinancialInformationRemainingPerformanceObligationDetails Supplemental Financial Information Remaining Performance Obligation (Details) Details 29 false false R30.htm 2410405 - Disclosure - Supplemental Financial Information - Self Insurance (Details) Sheet http://www.blue-bird.com/role/SupplementalFinancialInformationSelfInsuranceDetails Supplemental Financial Information - Self Insurance (Details) Details 30 false false R31.htm 2411406 - Disclosure - Supplemental Financial Information - Narrative (Details) Sheet http://www.blue-bird.com/role/SupplementalFinancialInformationNarrativeDetails Supplemental Financial Information - Narrative (Details) Details 31 false false R32.htm 2412407 - Disclosure - Supplemental Financial Information - Pension Expense (Details) Sheet http://www.blue-bird.com/role/SupplementalFinancialInformationPensionExpenseDetails Supplemental Financial Information - Pension Expense (Details) Details 32 false false R33.htm 2413408 - Disclosure - Supplemental Financial Information Supplemental Financial Information - Derivative Instruments (Details) Sheet http://www.blue-bird.com/role/SupplementalFinancialInformationSupplementalFinancialInformationDerivativeInstrumentsDetails Supplemental Financial Information Supplemental Financial Information - Derivative Instruments (Details) Details 33 false false R34.htm 2416409 - Disclosure - Debt - Narrative (Details) Sheet http://www.blue-bird.com/role/DebtNarrativeDetails Debt - Narrative (Details) Details 34 false false R35.htm 2417410 - Disclosure - Debt - Schedule of Long-term Debt (Details) Sheet http://www.blue-bird.com/role/DebtScheduleofLongtermDebtDetails Debt - Schedule of Long-term Debt (Details) Details 35 false false R36.htm 2418411 - Disclosure - Debt - Maturity Schedule (Details) Sheet http://www.blue-bird.com/role/DebtMaturityScheduleDetails Debt - Maturity Schedule (Details) Details 36 false false R37.htm 2419412 - Disclosure - Debt - Schedule of Debt Covenant Requirements (Details) Sheet http://www.blue-bird.com/role/DebtScheduleofDebtCovenantRequirementsDetails Debt - Schedule of Debt Covenant Requirements (Details) Details 37 false false R38.htm 2420413 - Disclosure - Debt - Covenants (Details) Sheet http://www.blue-bird.com/role/DebtCovenantsDetails Debt - Covenants (Details) Details 38 false false R39.htm 2422414 - Disclosure - Income Taxes (Details) Sheet http://www.blue-bird.com/role/IncomeTaxesDetails Income Taxes (Details) Details http://www.blue-bird.com/role/IncomeTaxes 39 false false R40.htm 2424415 - Disclosure - Guarantees, Commitments and Contingencies Guarantees, Commitments and Contingencies - Narrative (Details) Sheet http://www.blue-bird.com/role/GuaranteesCommitmentsandContingenciesGuaranteesCommitmentsandContingenciesNarrativeDetails Guarantees, Commitments and Contingencies Guarantees, Commitments and Contingencies - Narrative (Details) Details 40 false false R41.htm 2427416 - Disclosure - Segment Information (Details) Sheet http://www.blue-bird.com/role/SegmentInformationDetails Segment Information (Details) Details http://www.blue-bird.com/role/SegmentInformationTables 41 false false R42.htm 2428417 - Disclosure - Segment Information - Reconciliation of Segment Gross Profit (Details) Sheet http://www.blue-bird.com/role/SegmentInformationReconciliationofSegmentGrossProfitDetails Segment Information - Reconciliation of Segment Gross Profit (Details) Details 42 false false R43.htm 2431418 - Disclosure - Revenue (Details) Sheet http://www.blue-bird.com/role/RevenueDetails Revenue (Details) Details http://www.blue-bird.com/role/RevenueTables 43 false false R44.htm 2434419 - Disclosure - Earnings Per Share - Summary of Basic and Diluted Earnings Per Share (Details) Sheet http://www.blue-bird.com/role/EarningsPerShareSummaryofBasicandDilutedEarningsPerShareDetails Earnings Per Share - Summary of Basic and Diluted Earnings Per Share (Details) Details 44 false false R45.htm 2435420 - Disclosure - Earnings Per Share - Narrative (Details) Sheet http://www.blue-bird.com/role/EarningsPerShareNarrativeDetails Earnings Per Share - Narrative (Details) Details 45 false false R46.htm 2438421 - Disclosure - Accumulated Other Comprehensive Loss (Details) Sheet http://www.blue-bird.com/role/AccumulatedOtherComprehensiveLossDetails Accumulated Other Comprehensive Loss (Details) Details http://www.blue-bird.com/role/AccumulatedOtherComprehensiveLossTables 46 false false R47.htm 2440422 - Disclosure - Stockholders' Equity (Deficit) (Details) Sheet http://www.blue-bird.com/role/StockholdersEquityDeficitDetails Stockholders' Equity (Deficit) (Details) Details http://www.blue-bird.com/role/StockholdersEquityDeficit 47 false false All Reports Book All Reports blbd-20220101.htm a10q2022q1ex311.htm a10q2022q1ex312.htm a10q2022q1ex321.htm blbd-20220101.xsd blbd-20220101_cal.xml blbd-20220101_def.xml blbd-20220101_lab.xml blbd-20220101_pre.xml http://fasb.org/us-gaap/2021-01-31 http://xbrl.sec.gov/dei/2021 true true