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Summary of Significant Accounting Policies - Schedule of Estimated Amortization Expense (Detail)
$ in Millions
Sep. 24, 2016
USD ($)
Accounting Policies [Abstract]  
Fiscal 2017 $ 365.8
Fiscal 2018 355.0
Fiscal 2019 343.1
Fiscal 2020 331.4
Fiscal 2021 $ 312.0