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Intangible Assets and Goodwill - Additional Information (Detail) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2021
Goodwill and Intangible Assets Disclosure [Abstract]      
Amortization expense related to finite-lived intangible assets $ 76 $ 90 $ 83