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Other Balance Sheet Information - Inventories (Detail) - USD ($)
$ in Millions
Dec. 26, 2020
Sep. 26, 2020
Balance Sheet Related Disclosures [Abstract]    
Raw materials $ 152.6 $ 152.3
Work-in-process 60.1 46.5
Finished goods 207.5 196.3
Inventories $ 420.2 $ 395.1