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Summary of Significant Accounting Policies - Schedule of Inventories (Detail) - USD ($)
$ in Millions
Sep. 25, 2021
Sep. 26, 2020
Accounting Policies [Abstract]    
Raw materials $ 163.3 $ 152.3
Work-in-process 53.0 46.5
Finished goods 284.9 196.3
Inventories $ 501.2 $ 395.1