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Other Balance Sheet Information - Inventories (Detail) - USD ($)
$ in Millions
Mar. 30, 2019
Sep. 29, 2018
Balance Sheet Related Disclosures [Abstract]    
Raw materials $ 162.8 $ 134.9
Work-in-process 55.0 52.1
Finished goods 225.6 197.1
Inventories $ 443.4 $ 384.1