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Income Taxes - Income (Loss) Before Income Taxes (Detail) - USD ($)
$ in Millions
12 Months Ended
Sep. 28, 2019
Sep. 29, 2018
Sep. 30, 2017
Income Tax Disclosure [Abstract]      
Domestic $ (174.3) $ (581.9) $ 1,105.8
Foreign (83.4) 163.3 124.7
(Loss) income before income taxes $ (257.7) $ (418.6) $ 1,230.5