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Income Taxes - Income (Loss) Before Income Taxes (Detail) - USD ($)
$ in Millions
12 Months Ended
Sep. 25, 2021
Sep. 26, 2020
Sep. 28, 2019
Income Tax Disclosure [Abstract]      
Domestic $ 2,267.8 $ 921.1 $ (174.3)
Foreign 93.3 80.8 (83.4)
Income (loss) before income taxes $ 2,361.1 $ 1,001.9 $ (257.7)