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Fair Value Measurements - Narrative (Details) $ in Thousands, £ in Millions | Dec. 31, 2022 USD ($) segment | Dec. 31, 2022 GBP (£) segment | Sep. 30, 2022 USD ($) | Sep. 30, 2022 GBP (£) | Oct. 06, 2021 USD ($)
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Fair Value, Recurring |  |  |  |  |
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items] |  |  |  |  |
Contingent consideration | $ 16,439 |  |  |  |
Fair Value, Recurring | Interest Rate Swap |  |  |  |  |
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items] |  |  |  |  |
Number of instruments | segment | 2 | 2 |  |  |
Aidvantage |  |  |  |  |
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items] |  |  |  |  |
Contingent consideration | $ 14,000 |  | $ 13,800 |  |
BZ Bodies Limited |  |  |  |  |
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items] |  |  |  |  |
Contingent consideration | $ 2,400 | £ 2.0 | $ 2,400 | £ 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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