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Product Warranties - Product Warranty Activity (Detail) - USD ($)
$ in Millions
9 Months Ended
Jun. 30, 2018
Jul. 01, 2017
Movement in Standard and Extended Product Warranty, Increase (Decrease) [Roll Forward]    
Balance at Beginning of Period $ 17.0 $ 5.0
Provisions 13.1 12.1
Acquired 0.0 9.9
Settlements/ Adjustments (14.5) (9.3)
Balance at End of Period $ 15.6 $ 17.7