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Income Taxes - Provision for Income Taxes (Detail) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2017
Sep. 24, 2016
Sep. 26, 2015
Federal:      
Current $ 701.1 $ 209.0 $ 185.2
Deferred (276.9) (122.7) (137.0)
Federal, Total 424.2 86.3 48.2
State:      
Current 53.1 16.6 3.5
Deferred (15.9) (22.7) (11.0)
State, Total 37.2 (6.1) (7.5)
Foreign:      
Current 13.9 14.7 5.7
Deferred (0.3) (10.4) (0.8)
Foreign, Total 13.6 4.3 4.9
Provision for income taxes $ 475.0 $ 84.5 $ 45.6