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Other Balance Sheet Information - Other Balance Sheet Information of Inventories (Detail) - USD ($)
$ in Millions
Jul. 01, 2017
Sep. 24, 2016
Balance Sheet Related Disclosures [Abstract]    
Raw materials $ 106.4 $ 96.4
Work-in-process 50.5 51.7
Finished goods 200.1 126.6
Inventories $ 357.0 $ 274.7