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Summary of Significant Accounting Policies - Schedule of Estimated Amortization Expense (Detail)
$ in Millions
Sep. 30, 2017
USD ($)
Accounting Policies [Abstract]  
Fiscal 2018 $ 376.6
Fiscal 2019 364.9
Fiscal 2020 353.6
Fiscal 2021 332.2
Fiscal 2022 $ 319.8