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Goodwill and Intangible Assets - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2026 | Jun. 30, 2025 | Jun. 30, 2026 | Jun. 30, 2025
Goodwill And Intangible Assets [Line Items] |  |  |  |
Amortization of intangible assets | $ 2 | $ 2 | $ 5 | $ 5
Amortization expense estimated for year one | 7 |  | 7 |
Amortization expense estimated for year two | 7 |  | 7 |
Amortization expense estimated for year three | 7 |  | 7 |
Amortization expense estimated for year four | 7 |  | 7 |
Amortization expense estimated for year five | $ 7 |  | $ 7 |
Minimum [Member] |  |  |  |
Goodwill And Intangible Assets [Line Items] |  |  |  |
Useful life of intangible assets | 10 years |  | 10 years |
Maximum [Member] |  |  |  |
Goodwill And Intangible Assets [Line Items] |  |  |  |
Useful life of intangible assets | 25 years |  | 25 years |
Weighted Average [Member] |  |  |  |
Goodwill And Intangible Assets [Line Items] |  |  |  |
Useful life of intangible assets | 16 years |  | 16 years |

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