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Summary of Significant Accounting Policies - Schedule of Estimated Amortization Expense (Detail)
$ in Millions
Sep. 28, 2019
USD ($)
Accounting Policies [Abstract]  
Fiscal 2020 $ 295.5
Fiscal 2021 274.2
Fiscal 2022 263.8
Fiscal 2023 166.2
Fiscal 2024 $ 143.1