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Revenue from Contracts with Clients - Narrative (Details)	12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Disaggregation of Revenue [Line Items]
Term of risk management consulting contracts	6 months
Clients | Revenue from Contract with Customer Benchmark | Customer Concentration Risk
Disaggregation of Revenue [Line Items]
Concentration risk (as a percent)	2.20%	5.70%	5.50%

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Revenue, Term Of Risk Management Consulting Contract

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