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Summary of Significant Accounting Policies - Schedule of Inventories (Detail) - USD ($)
$ in Millions
Sep. 28, 2019
Sep. 29, 2018
Accounting Policies [Abstract]    
Raw materials $ 166.1 $ 134.9
Work-in-process 54.5 52.1
Finished goods 224.3 197.1
Inventories $ 444.9 $ 384.1