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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