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Fair Value Measurements - Narrative (Details) $ in Thousands, £ in Millions | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2024 USD ($) | Mar. 31, 2024 GBP (£) | Mar. 31, 2024 USD ($) | Mar. 31, 2023 USD ($) | Sep. 30, 2023 USD ($) | Sep. 30, 2023 GBP (£) | Oct. 31, 2021 USD ($)
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items] |  |  |  |  |  |  |
Payments of contingent consideration |  |  | $ 8,168 | $ 4,041 |  |  |
Aidvantage |  |  |  |  |  |  |
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items] |  |  |  |  |  |  |
Contingent consideration | $ 2,800 |  | $ 2,800 |  | $ 7,500 |  |
BZ Bodies Limited |  |  |  |  |  |  |
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items] |  |  |  |  |  |  |
Contingent consideration |  |  |  |  | $ 2,500 | £ 2.0 |
Payments of contingent consideration | $ 2,500 | £ 2.0 |  |  |  |  |
Maximum | Navient |  |  |  |  |  |  |
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items] |  |  |  |  |  |  |
Contingent consideration |  |  |  |  |  |  | $ 65,000

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