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Product Warranties - Product Warranty Activity (Detail) - USD ($)
$ in Millions
3 Months Ended
Dec. 28, 2019
Dec. 29, 2018
Movement in Standard and Extended Product Warranty, Increase (Decrease) [Roll Forward]    
Balance at Beginning of Period $ 13.9 $ 15.9
Provisions 3.8 2.6
Standard and Extended Product Warranty Accrual, Additions from Business Acquisition 0.5 0.0
Settlements/ Adjustments (4.1) (3.4)
Balance at End of Period $ 14.1 $ 15.1