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Supplemental Financial Information - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Oct. 02, 2021 | Oct. 03, 2020 | Sep. 28, 2019
Product Warranty Liability [Line Items] |  |  |
Extended product warranty, period | 12 months |  |
Shipping and handling revenue | $ 13.4 | $ 16.9 | $ 19.4
Shipping and handling costs | $ 11.7 | $ 14.5 | $ 17.0
Minimum |  |  |
Product Warranty Liability [Line Items] |  |  |
Extended product warranty, period | 2 years |  |
Maximum |  |  |
Product Warranty Liability [Line Items] |  |  |
Extended product warranty, period | 5 years |  |

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- Definition Extended Product Warranty, Period + References No definition available. + Details
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Namespace Prefix: | blbd_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Shipping Handling And Transportation Costs1 + References No definition available. + Details
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Namespace Prefix: | blbd_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Shipping and Handling Revenue1 + References No definition available. + Details
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Namespace Prefix: | blbd_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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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
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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: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |