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Employee Benefit Plans (Details) - USD ($) $ in Thousands	12 Months Ended
Employee Benefit Plans (Details) - USD ($) $ in Thousands	Sep. 26, 2015	Sep. 27, 2014	Sep. 28, 2013
Investment Profit Sharing Plan [Member]
Postemployment and Postretirement Benefit Plans [Line Items]
Operating and administrative expenses	$ 1,600	$ 1,400	$ 1,300
Nonqualified Investment Plan [Member]
Postemployment and Postretirement Benefit Plans [Line Items]
Operating and administrative expenses	99	84	77
Cash Bonuses [Member]
Postemployment and Postretirement Benefit Plans [Line Items]
Operating and administrative expenses	$ 10,100	$ 9,200	$ 9,000