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Subsequent Events - Minimum Liquidity (Details) - Credit Facility - Fourth Admendment to Credit Agreement - Subsequent Event | Nov. 24, 2021 USD ($)
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Limited Availability Period One |
Debt Instrument [Line Items] |
Minimum Liquidity | $ 10.0
Limited Availability Period Two |
Debt Instrument [Line Items] |
Minimum Liquidity | 5.0
Limited Availability Period Three |
Debt Instrument [Line Items] |
Minimum Liquidity | 15.0
Limited Availability Period Four |
Debt Instrument [Line Items] |
Minimum Liquidity | $ 20.0

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- Definition Debt Instrument, Covenant, Liquidity, Minimum + References No definition available. + Details
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Namespace Prefix: | blbd_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_DebtInstrumentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_LongtermDebtTypeAxis=us-gaap_LineOfCreditMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_DebtInstrumentAxis=blbd_FourthAdmendmentToCreditAgreementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | blbd_DebtInstrumentLimitedAvailabilityPeriodAxis=blbd_LimitedAvailabilityPeriodTwoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | blbd_DebtInstrumentLimitedAvailabilityPeriodAxis=blbd_LimitedAvailabilityPeriodThreeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | blbd_DebtInstrumentLimitedAvailabilityPeriodAxis=blbd_LimitedAvailabilityPeriodFourMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |