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Summary of Significant Accounting Policies - Product Warranty (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Sep. 27, 2014
Sep. 28, 2013
Movement in Standard Product Warranty Accrual [Roll Forward]    
Balance at Beginning of Period $ 9.3 $ 6.2
Provisions 7.1 12.8
Settlements/ Adjustments (10.1) (9.7)
Balance at End of Period $ 6.3 $ 9.3