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Summary of Significant Accounting Policies - Product Warranty (Detail) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2023
Sep. 24, 2022
Movement in Standard Product Warranty Accrual [Roll Forward]    
Balance at Beginning of Period $ 8.0 $ 8.8
Provisions 6.8 6.3
Standard and Extended Product Warranty Accrual, Additions from Business Acquisition 0.8 0.0
Settlements/ Adjustments (7.3) (7.1)
Balance at End of Period $ 8.3 $ 8.0