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Allowance For Doubtful Accounts (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2018
Sep. 24, 2017
Sep. 25, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Allowance for Doubtful Accounts Receivable $ 4,796 $ 4,327 $ 4,194
Provision for Doubtful Accounts 1,952 1,696 1,195
Allowance for Doubtful Accounts Receivable, Recoveries (1,942) (1,227) (1,062)
Allowance for Doubtful Accounts Receivable $ 4,806 $ 4,796 $ 4,327