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Product Warranties - Product Warranty Activity (Detail) - USD ($)
$ in Millions
9 Months Ended
Jun. 29, 2019
Jun. 30, 2018
Movement in Standard and Extended Product Warranty, Increase (Decrease) [Roll Forward]    
Balance at Beginning of Period $ 15.9 $ 17.0
Provisions 10.1 13.1
Settlements/ Adjustments (11.1) (14.5)
Balance at End of Period $ 14.9 $ 15.6