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Product Warranties - Product Warranty Activity (Detail) - USD ($)
$ in Millions
3 Months Ended
Dec. 29, 2018
Dec. 30, 2017
Movement in Standard and Extended Product Warranty, Increase (Decrease) [Roll Forward]    
Balance at Beginning of Period $ 15.9 $ 17.0
Provisions 2.6 4.3
Settlements/ Adjustments (3.4) (5.1)
Balance at End of Period $ 15.1 $ 16.2