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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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