SCHEDULE II VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($) $ in Thousands		12 Months Ended
		Sep. 29, 2018	Sep. 30, 2017	Sep. 24, 2016
Allowance for Doubtful Accounts [Member]
Valuation And Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period		$ 3,044	$ 2,441	$ 3,520
Charged (credited) to Costs and Expenses		4,443	3,545	1,146
Other Additions		0	0	0
Deductions	[1]	(3,858)	(2,942)	(2,225)
Balance at End of Period		3,629	3,044	2,441
Valuation Allowance of Deferred Tax Assets [Member]
Valuation And Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period		59,188	58,782	54,045
Charged (credited) to Costs and Expenses		(1,366)	406	4,737
Other Additions		0	0	0
Deductions	[1]	(19,941)	0	0
Balance at End of Period		$ 37,881	$ 59,188	$ 58,782

[1] Represents amounts that did not impact earnings.