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Summary of Significant Accounting Policies - Product Warranty (Detail) - USD ($)
$ in Millions
12 Months Ended
Sep. 24, 2016
Sep. 26, 2015
Movement in Standard Product Warranty Accrual [Roll Forward]    
Balance at Beginning of Period $ 5.4 $ 6.3
Provisions 7.1 6.1
Settlements/ Adjustments (7.5) (7.0)
Balance at End of Period $ 5.0 $ 5.4