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Revenue (Details) - USD ($) $ in Thousands	12 Months Ended
	Oct. 02, 2021	Oct. 03, 2020	Sep. 28, 2019
Disaggregation of Revenue [Line Items]
Net sales	$ 683,995	$ 879,221	$ 1,018,874
Diesel buses
Disaggregation of Revenue [Line Items]
Net sales	291,203	397,567	476,909
Alternative fuel buses
Disaggregation of Revenue [Line Items]
Net sales	300,706	381,555	426,508
Other
Disaggregation of Revenue [Line Items]
Net sales	34,875	45,191	50,906
Parts
Disaggregation of Revenue [Line Items]
Net sales	$ 57,211	$ 54,908	$ 64,551

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