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Other Balance Sheet Information - Other Balance Sheet Information of Inventories (Detail) - USD ($)
$ in Millions
Dec. 26, 2015
Sep. 26, 2015
Balance Sheet Related Disclosures [Abstract]    
Raw materials $ 103.1 $ 98.3
Work-in-process 58.7 58.7
Finished goods 124.6 126.1
Inventories $ 286.4 $ 283.1