SCHEDULE II VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($) $ in Thousands		12 Months Ended
		Sep. 26, 2015	Sep. 27, 2014	Sep. 28, 2013
Allowance for Doubtful Accounts [Member]
Valuation And Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period		$ 11,122	$ 6,786	$ 4,347
Charged (credited) to Costs and Expenses		(397)	11,933	6,717
Deductions	[1]	(7,205)	(7,597)	(4,278)
Balance at End of Period		3,520	11,122	6,786
Valuation Allowance of Deferred Tax Assets [Member]
Valuation And Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period		51,864	46,406	36,635
Charged (credited) to Costs and Expenses		2,181	5,458	9,771
Balance at End of Period		$ 54,045	$ 51,864	$ 46,406

[1] Represents amounts that did not impact earnings.