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Summary of Significant Accounting Policies - Accounts Receivable Reserve Activity (Detail) - USD ($)
 12 Months Ended
Sep. 25, 2021
Sep. 26, 2020
Sep. 28, 2019
Allowance for Doubtful Accounts Receivable [Roll Forward]      
Balance at Beginning of Period $ 31,600,000 $ 17,800,000 $ 16,200,000
Charged to Costs and Expenses 15,000,000.0 26,800,000 4,400,000
Accounts receivable reserve divested 0 (5,800,000) 0
Write- offs and Payments (6,100,000) (7,200,000) (2,800,000)
Balance at End of Period $ 40,500,000 $ 31,600,000 $ 17,800,000