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Segment Information (Details) $ in Thousands	12 Months Ended
	Oct. 02, 2021 USD ($) segment	Oct. 03, 2020 USD ($)	Sep. 28, 2019 USD ($)
Segment Reporting Information [Line Items]
Number of operating segments | segment	2
Net sales	$ 683,995	$ 879,221	$ 1,018,874
Net sales	683,995	879,221	1,018,874
Segment gross profit	72,141	96,200	133,474
United States
Segment Reporting Information [Line Items]
Net sales	601,751	795,207	929,523
Canada
Segment Reporting Information [Line Items]
Net sales	75,644	79,442	80,056
Rest of world
Segment Reporting Information [Line Items]
Net sales	6,600	4,572	9,295
Intersegment Eliminations | Parts
Segment Reporting Information [Line Items]
Net sales	3,800	4,100	3,500
Operating Segments
Segment Reporting Information [Line Items]
Net sales	683,995	879,221	1,018,874
Segment gross profit	72,141	96,200	133,474
Operating Segments | Bus
Segment Reporting Information [Line Items]
Net sales	625,198	822,616	952,242
Segment gross profit	50,394	76,059	110,015
Operating Segments | Parts
Segment Reporting Information [Line Items]
Net sales	58,797	56,605	66,632
Segment gross profit	$ 21,747	$ 20,141	$ 23,459

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