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Allowance For Doubtful Accounts (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 25, 2016
Sep. 27, 2015
Sep. 28, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Allowance for Doubtful Accounts Receivable $ 4,194 $ 4,526 $ 4,501
Provision for Doubtful Accounts 1,195 1,307 1,754
Allowance for Doubtful Accounts Receivable, Recoveries (1,062) (1,639) (1,729)
Allowance for Doubtful Accounts Receivable $ 4,327 $ 4,194 $ 4,526