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Summary of Significant Accounting Policies - Product Warranty (Detail) - USD ($)
$ in Millions
12 Months Ended
Sep. 25, 2021
Sep. 26, 2020
Movement in Standard Product Warranty Accrual [Roll Forward]    
Balance at Beginning of Period $ 9.9 $ 13.9
Provisions 7.7 11.7
Standard and Extended Product Warranty Accrual, Additions from Business Acquisition 0.3 0.5
Standard Product Warranty Accrual, Period Increase (Decrease) 0.0 (6.1)
Settlements/ Adjustments (9.1) (10.1)
Balance at End of Period $ 8.8 $ 9.9