Segment Information (Details) $ in Thousands	3 Months Ended
	Dec. 30, 2023 USD ($) segment	Dec. 31, 2022 USD ($)
Segment Reporting Information [Line Items]
Number of Operating Segments | segment	2
Net sales	$ 317,660	$ 235,732
Gross profit	63,558	7,457
U.S.
Segment Reporting Information [Line Items]
Net sales	302,532	204,541
Canada
Segment Reporting Information [Line Items]
Net sales	15,119	30,521
Rest of world
Segment Reporting Information [Line Items]
Net sales	9	670
Operating Segments
Segment Reporting Information [Line Items]
Gross profit	63,558	7,457
Operating Segments | Bus
Segment Reporting Information [Line Items]
Net sales	293,437	213,249
Gross profit	51,294	(3,731)
Operating Segments | Parts
Segment Reporting Information [Line Items]
Net sales	24,223	22,483
Gross profit	12,264	11,188
Intersegment Eliminations | Parts
Segment Reporting Information [Line Items]
Net sales	$ 1,600	$ 1,100