Segment Information - Reconciliation of Segment Gross Profit (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jul. 04, 2020	Jun. 29, 2019	Jul. 04, 2020	Jun. 29, 2019
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Segment gross profit	$ 21,082	$ 41,782	$ 66,551	$ 86,846
Selling, general and administrative expenses	(17,793)	(20,996)	(58,146)	(61,197)
Interest expense	(2,406)	(3,369)	(9,961)	(10,241)
Interest income	27	0	27	9
Other income (expense), net	181	(410)	555	(1,034)
Income (loss) before income taxes	1,091	17,007	(974)	14,383
Operating Segments
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Segment gross profit	21,082	41,782	66,551	86,846
Segment Reconciling Items
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Selling, general and administrative expenses	(17,793)	(20,996)	(58,146)	(61,197)
Interest expense	(2,406)	(3,369)	(9,961)	(10,241)
Interest income	27	0	27	9
Other income (expense), net	$ 181	$ (410)	$ 555	$ (1,034)