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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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