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Fair Value Measurements - Narrative (Details) $ in Thousands, £ in Millions | 3 Months Ended | 9 Months Ended |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2024 USD ($) | Jun. 30, 2024 GBP (£) | Jun. 30, 2024 USD ($) | Jun. 30, 2023 USD ($) | Mar. 31, 2024 USD ($) | Dec. 31, 2023 USD ($) | Sep. 30, 2023 USD ($) | Sep. 30, 2023 GBP (£) | Mar. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Sep. 30, 2022 USD ($) | Oct. 31, 2021 USD ($)
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Shareholders' equity | $ 1,818,715 |  | $ 1,818,715 | $ 1,632,853 | $ 1,789,143 | $ 1,717,806 | $ 1,667,835 |  | $ 1,601,722 | $ 1,581,007 | $ 1,549,371 |
Payments of contingent consideration |  |  | 10,977 | $ 6,662 |  |  |  |  |  |  |  |
Aidvantage |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration |  |  |  |  |  |  | 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
Foreign currency translation adjustment |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Shareholders' equity | (46,405) |  | (46,405) |  |  |  | $ (50,484) |  |  |  |  |
Australia, Dollars | Foreign currency translation adjustment |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Shareholders' equity | 18,900 |  | 18,900 |  |  |  |  |  |  |  |  |
United Kingdom, Pounds | Foreign currency translation adjustment |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Shareholders' equity | $ 19,400 |  | $ 19,400 |  |  |  |  |  |  |  |  |

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