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Income Taxes - Reconciliation Using U.S. Statutory Rate (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021
Income Tax Disclosure [Abstract] |  |  |
Computed tax expense at the federal statutory rate | $ 95 | $ 70 | $ 85
Foreign impact of taxation at different rates, repatriation, valuation allowance, and other | 30 | 38 | 8
Global Intangible Low Taxed Income (GILTI) | 15 | 23 | 18
Purification Solutions business divestiture |  | (179) |
Impact of the Coronavirus Aid, Relief, and Economic Security ("CARES") Act of 2020 |  |  | 10
Impact of increase (decrease) in valuation allowance on U.S. deferred taxes | (156) | 160 | (1)
U.S. and state benefits from research and experimentation activities | (2) | (2) | (2)
Provision (settlement) of unrecognized tax benefits | 2 | 1 | 1
Permanent differences, net | (4) | 10 | 7
State taxes, net of federal effect | (8) | (19) | (3)
Provision (benefit) for income taxes | $ (28) | $ 102 | $ 123

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