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Summary of Significant Accounting Policies - Schedule of Inventories (Detail) - USD ($)
$ in Millions
Sep. 29, 2018
Sep. 30, 2017
Accounting Policies [Abstract]    
Raw materials $ 134.9 $ 95.7
Work-in-process 52.1 45.0
Finished goods 197.1 190.9
Inventories $ 384.1 $ 331.6