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Restructuring and Other Related Charges - Additional Information (Details) $ in Thousands	1 Months Ended	3 Months Ended		9 Months Ended		12 Months Ended
	Jun. 30, 2024 office_building	Sep. 30, 2024 USD ($)	Sep. 30, 2023 USD ($)	Sep. 30, 2024 USD ($)	Sep. 30, 2023 USD ($)	Dec. 31, 2025 USD ($)	Nov. 12, 2024 USD ($)
Restructuring Cost and Reserve [Line Items]
Restructuring charges				$ 8,840
Number of offices closed | office_building	2
Total impairment expense		$ 195,708	$ 3,600	677,239	$ 3,600
Restructuring payments				6,116
June 2024 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Restructuring charges		2,100		8,800
June 2024 Restructuring Plan | Minimum
Restructuring Cost and Reserve [Line Items]
Estimated additional restructuring charges		1,000		1,000
June 2024 Restructuring Plan | Maximum
Restructuring Cost and Reserve [Line Items]
Estimated additional restructuring charges		$ 2,000		2,000
November 2024 Restructuring Plan | Minimum | Forecast
Restructuring Cost and Reserve [Line Items]
Restructuring payments						$ 18,000
November 2024 Restructuring Plan | Minimum | Subsequent Event
Restructuring Cost and Reserve [Line Items]
Expected cost restructuring plan							$ 22,000
November 2024 Restructuring Plan | Maximum | Forecast
Restructuring Cost and Reserve [Line Items]
Restructuring payments						$ 22,000
November 2024 Restructuring Plan | Maximum | Subsequent Event
Restructuring Cost and Reserve [Line Items]
Expected cost restructuring plan							$ 26,000
Facility Closing
Restructuring Cost and Reserve [Line Items]
Total impairment expense				2,200
Impairment of ROU asset				1,100
Impairment of leasehold improvements				$ 1,100

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Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

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The adjustment to reduce the value of existing agreements that specify the lessee's rights to use the leased property. This expense is charged when the estimates of future profits generated by the leased property are reduced.

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