Annual report pursuant to Section 13 and 15(d)

Allowance for Doubtful Accounts - Schedule of Allowance for Doubtful Accounts (Detail)

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Allowance for Doubtful Accounts - Schedule of Allowance for Doubtful Accounts (Detail) - USD ($)
$ in Thousands
12 Months Ended
Sep. 24, 2016
Sep. 26, 2015
Sep. 27, 2014
Allowance for Doubtful Accounts Receivable [Roll Forward]      
Balances at Beginning of Period $ 19,296 $ 25,212 $ 21,158
Charged/ (Credited) to Costs and Expenses 6,041 741 8,988
Asset Write-Offs, Less Recoveries (4,268) (6,657) (4,934)
Balances at End of Period $ 21,069 $ 19,296 $ 25,212