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Product Warranties - Product Warranty (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jun. 25, 2016
Jul. 01, 2017
Jun. 25, 2016
Movement in Standard and Extended Product Warranty, Increase (Decrease) [Roll Forward]      
Balance at Beginning of Period $ 9.1 $ 5.0 $ 5.4
Provisions   12.1 8.5
Standard and Extended Product Warranty Accrual, Additions from Business Acquisition   9.9 0.0
Settlements/ Adjustments   (9.3) $ (4.8)
Balance at End of Period   $ 17.7