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Quarterly Statement of Operations Information (Unaudited) - Summary of Quarterly Results of Operations (Parenthetical) (Detail) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Sep. 24, 2016
Mar. 26, 2016
Dec. 26, 2015
Sep. 26, 2015
Jun. 27, 2015
Dec. 27, 2014
Sep. 24, 2016
Sep. 26, 2015
Sep. 27, 2014
Quarterly Financial Information Disclosure [Abstract]                  
Restructuring charges $ 2.9 $ 3.8 $ 2.3 $ 6.5 $ 11.9 $ 8.0 $ 10.5 $ 28.5 $ 51.7
Gain (Loss) on Sale of Investments     $ 25.1       25.1 0.0 0.0
Debt extinguishment loss 0.8 $ 4.5   (37.8) $ 18.2 $ 6.7 $ 5.3 $ 62.7 $ 7.4
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities $ 1.1     $ 7.8