Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
Revenue (Details) - USD ($) $ in Thousands	Jun. 28, 2025	Jun. 29, 2024	Jun. 28, 2025	Jun. 29, 2024
Disaggregation of Revenue [Line Items]
Net sales	$ 398,011	$ 333,367	$ 1,070,734	$ 996,942
Diesel buses
Disaggregation of Revenue [Line Items]
Net sales	125,872	109,797	367,855	318,239
Alternative fuel buses
Disaggregation of Revenue [Line Items]
Net sales	234,373	185,453	582,757	560,944
Other
Disaggregation of Revenue [Line Items]
Net sales	12,699	13,393	44,471	42,081
Parts
Disaggregation of Revenue [Line Items]
Net sales	$ 25,067	$ 24,724	$ 75,651	$ 75,678

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.

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+ Details

- Definition

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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+ Details

Blue Bird Corp 10-Q