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Summary of Significant Accounting Policies - Product Warranty (Detail) - USD ($)
$ in Millions
12 Months Ended
Sep. 28, 2019
Sep. 29, 2018
Movement in Standard Product Warranty Accrual [Roll Forward]    
Balance at Beginning of Period $ 15.9 $ 17.0
Provisions 14.1 18.3
Settlements/ Adjustments (16.1) (19.4)
Balance at End of Period $ 13.9 $ 15.9