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Summary of Significant Accounting Policies - Schedule of Inventories (Detail) - USD ($)
$ in Millions
Sep. 30, 2017
Sep. 24, 2016
Accounting Policies [Abstract]    
Raw materials $ 95.7 $ 96.4
Work-in-process 45.0 51.7
Finished goods 190.9 126.6
Inventories $ 331.6 $ 274.7