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Insurance Recoveries - Additional Information (Detail) - USD ($) $ in Millions | 12 Months Ended
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Sep. 30, 2023 | Sep. 30, 2022
Business Interruption Loss [Line Items] |  |
Insurance proceeds | $ 14 |
Cash provided by investing activities | 12 |
Gain Recognized Rrelated to lost margin and replacement of fixed assets | 9 |
Flood [Member] |  |
Business Interruption Loss [Line Items] |  |
Cash provided by operating activities | 2 |
Cash provided by investing activities | 12 | $ 19
Pepinster, Belgium [Member] | Flood [Member] |  |
Business Interruption Loss [Line Items] |  |
Insurance proceeds | $ 33 |

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