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Restructuring - Narrative (Details) $ in Millions	1 Months Ended	12 Months Ended
	Mar. 31, 2023 USD ($) employee	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2021 USD ($)
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 40	$ 40	$ 0	$ 0
Employee Severance
Restructuring Cost and Reserve [Line Items]
Expected number of positions to eliminated | employee	270
Expected number of positions to eliminated as a percentage (as a percent)	4.00%
Restructuring charges		$ 40

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- Definition

The expected number of positions to be eliminated as a result of restructuring activities.

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