SCHEDULE II VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($) $ in Thousands		12 Months Ended
		Sep. 25, 2021	Sep. 26, 2020	Sep. 28, 2019
Allowance for Doubtful Accounts [Member]
Valuation And Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period		$ 4,473	$ 2,573	$ 3,629
Charged (credited) to Costs and Expenses		770	3,855	2,580
Other Additions		0	0	0
Deductions	[1]	(1,911)	(1,955)	(3,636)
Balance at End of Period		3,332	4,473	2,573
Valuation Allowance of Deferred Tax Assets [Member]
Valuation And Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period		37,698	37,996	37,881
Charged (credited) to Costs and Expenses		570	(298)	115
Other Additions		0	0	0
Deductions	[1]	0	0	0
Balance at End of Period		$ 38,268	$ 37,698	$ 37,996

[1] Represents amounts that did not impact earnings.