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Product Warranties - Product Warranty Activity (Detail) - USD ($)
$ in Millions
9 Months Ended
Jun. 27, 2020
Jun. 29, 2019
Movement in Standard and Extended Product Warranty, Increase (Decrease) [Roll Forward]    
Balance at Beginning of Period $ 13.9 $ 15.9
Provisions 8.0 10.1
Standard and Extended Product Warranty Accrual, Additions from Business Acquisition 0.5 0.0
Standard Product Warranty Accrual, Period Increase (Decrease) (6.1) 0.0
Settlements/ Adjustments (7.2) (11.1)
Balance at End of Period $ 9.1 $ 14.9