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Fair Value Measurements - Narrative (Details) £ in Millions, $ in Millions | Dec. 31, 2023 USD ($) | Dec. 31, 2023 GBP (£) | Sep. 30, 2023 USD ($) | Sep. 30, 2023 GBP (£) | Oct. 31, 2021 USD ($)
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Aidvantage |  |  |  |  |
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items] |  |  |  |  |
Contingent consideration | $ 5.6 |  | $ 7.5 |  |
BZ Bodies Limited |  |  |  |  |
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items] |  |  |  |  |
Contingent consideration | $ 2.5 | £ 2.0 | $ 2.5 | £ 2.0 |
Maximum | Navient |  |  |  |  |
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items] |  |  |  |  |
Contingent consideration |  |  |  |  | $ 65.0

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