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Income Taxes - Income (Loss) Before Income Taxes (Detail) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Sep. 30, 2017
Sep. 29, 2018
Sep. 30, 2017
Sep. 24, 2016
Income Tax Disclosure [Abstract]        
Domestic $ 1,105.8 $ (581.9)   $ 310.7
Foreign 124.7 163.3   104.6
(Loss) income before income taxes $ 1,230.5 $ (418.6) $ 1,230.5 $ 415.3