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Product Warranties - Product Warranty (Detail) - USD ($)
$ in Millions
3 Months Ended
Dec. 31, 2016
Dec. 26, 2015
Movement in Standard and Extended Product Warranty, Increase (Decrease) [Roll Forward]    
Balance at Beginning of Period $ 5.0 $ 5.4
Provisions 2.6 5.7
Settlements/ Adjustments (1.7) (1.7)
Balance at End of Period $ 5.9 $ 9.4