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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]
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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Amount of cash inflow for proceeds from settlement of insurance claim, classified as investing activities. Excludes insurance settlement classified as operating activities.

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