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

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