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. 29, 2018
Sep. 30, 2017
Sep. 24, 2016
Allowance for Doubtful Accounts Receivable [Roll Forward]      
Balances at Beginning of Period $ 21,436 $ 21,069 $ 19,296
Charged/ (Credited) to Costs and Expenses 2,132 2,921 6,041
Asset Write-Offs   (2,554) (4,268)
Asset Recoveries 557    
Balances at End of Period 24,125 21,436 21,069
Reserves for expected returns $ 6,500 $ 6,900 $ 8,200