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Insurance Recoveries - Additional Information (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021
Business Interruption Loss [Line Items] |  |  |
Cash provided by investing activities | $ 12 | $ 1 | $ 2
Gain Recognized Rrelated to lost margin and replacement of fixed assets | 9 |  |
Pepinster, Belgium [Member] |  |  |
Business Interruption Loss [Line Items] |  |  |
Insurance proceeds | 14 | 11 | 8
Pepinster, Belgium [Member] | Flood [Member] |  |  |
Business Interruption Loss [Line Items] |  |  |
Flood-related expenses | 0 | 6 | 17
Insurance proceeds | 33 |  |
Cash provided by operating activities | 2 | 10 | 6
Cash provided by investing activities | $ 12 | 1 | $ 2
Franklin, Louisiana [Member] | Equipment Failure [Member] |  |  |
Business Interruption Loss [Line Items] |  |  |
Insurance proceeds |  | $ 8 |

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