SCHEDULE II VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($) $ in Thousands		12 Months Ended
		Sep. 28, 2019	Sep. 29, 2018	Sep. 30, 2017
Allowance for Doubtful Accounts [Member]
Valuation And Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period		$ 3,629	$ 3,044	$ 2,441
Charged (credited) to Costs and Expenses		2,580	4,443	3,545
Other Additions		0	0	0
Deductions	[1]	(3,636)	(3,858)	(2,942)
Balance at End of Period		2,573	3,629	3,044
Valuation Allowance of Deferred Tax Assets [Member]
Valuation And Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period		37,881	59,188	58,782
Charged (credited) to Costs and Expenses		115	(1,366)	406
Other Additions		0	0	0
Deductions	[1]	0	(19,941)	0
Balance at End of Period		$ 37,996	$ 37,881	$ 59,188

[1] Represents amounts that did not impact earnings.