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Segment Information (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Apr. 01, 2023 USD ($)	Apr. 02, 2022 USD ($)	Apr. 01, 2023 USD ($) segment	Apr. 02, 2022 USD ($)
Segment Reporting Information [Line Items]
Number of Operating Segments | segment			2
Net sales	$ 299,814	$ 207,659	$ 535,546	$ 336,882
Gross profit	35,649	3,157	43,106	19,354
United States
Segment Reporting Information [Line Items]
Net sales	264,281	194,245	468,822	294,792
Canada
Segment Reporting Information [Line Items]
Net sales	32,234	12,193	62,755	38,497
Rest of world
Segment Reporting Information [Line Items]
Net sales	3,299	1,221	3,969	3,593
Operating Segments
Segment Reporting Information [Line Items]
Gross profit	35,649	3,157	43,106	19,354
Operating Segments | Bus
Segment Reporting Information [Line Items]
Net sales	273,472	188,484	486,721	300,921
Gross profit	23,099	(3,984)	19,368	5,658
Operating Segments | Parts
Segment Reporting Information [Line Items]
Net sales	26,342	19,175	48,825	35,961
Gross profit	12,550	7,141	23,738	13,696
Intersegment Eliminations | Parts
Segment Reporting Information [Line Items]
Net sales	$ 1,300	$ 1,100	$ 2,400	$ 1,900

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