Significant Accounting Policies - Accounts receivable Allowances (Details) - USD ($) $ in Thousands	12 Months Ended
	Oct. 02, 2021	Oct. 03, 2020	Sep. 28, 2019
Accounts Receivable, Allowance for Doubtful Accounts [Roll Forward]
Beginning balance	$ 7,630	$ 8,690	$ 4,568
Additions charged to expenses	1,261	2,630	5,210
Deductions from reserves	(2,286)	(3,690)	(1,088)
Ending balance	$ 6,605	$ 7,630	$ 8,690