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Summary of Significant Accounting Policies - Schedule of Estimated Amortization Expense (Detail)
$ in Millions
Sep. 30, 2023
USD ($)
Accounting Policies [Abstract]  
Fiscal 2024 $ 203.2
Fiscal 2025 188.5
Fiscal 2026 158.6
Fiscal 2027 71.5
Fiscal 2028 $ 68.5