Schedule II - Valuation and Qualifying Accounts - Schedule of Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Oct. 03, 2020	Sep. 28, 2019	Sep. 29, 2018
Allowance for losses on accounts receivable (deducted from the asset to which it relates)
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of period	$ 1,537	$ 885	$ 980
Additions charged to costs and expenses	4,051	1,189	380
Additions charged to other accounts	0	0	0
Deductions	(1,991)	(537)	(475)
Balance at end of period	3,597	1,537	885
Valuation allowance on deferred income tax assets (deducted from the asset to which it relates)
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of period	29,170	28,369	61,668
Additions charged to costs and expenses	5,778	2,213	1,107
Additions charged to other accounts	0	0	0
Deductions	0	(1,412)	(34,406)
Balance at end of period	$ 34,948	$ 29,170	$ 28,369