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Summary of Significant Accounting Policies - Schedule of Estimated Amortization Expense (Detail)
$ in Millions
Sep. 26, 2015
USD ($)
Accounting Policies [Abstract]  
Fiscal 2016 $ 377.0
Fiscal 2017 365.6
Fiscal 2018 355.1
Fiscal 2019 343.5
Fiscal 2020 $ 332.3