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Commitments and Contingencies (Details) - USD ($)
12 Months Ended
Sep. 24, 2017
Sep. 25, 2016
Sep. 27, 2015
Loss Contingencies [Line Items]      
Operating Leases, Rent Expense $ 3,866,000 $ 3,792,000 $ 3,415,000
Other Commitment $ 503,000