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Fair Value Measurements - Narrative (Details) $ in Thousands, £ in Millions | 3 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Mar. 31, 2024 USD ($) | Mar. 31, 2024 GBP (£) | Sep. 30, 2024 USD ($) | Sep. 30, 2023 USD ($) | Sep. 30, 2022 USD ($) | Sep. 30, 2023 GBP (£) | Jan. 31, 2022 USD ($) | Jan. 31, 2022 GBP (£) | Oct. 31, 2021 USD ($) | Oct. 06, 2021 USD ($)
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items] |  |  |  |  |  |  |  |  |  |
Payments of contingent consideration |  |  | $ 10,977 | $ 9,431 | $ 1,369 |  |  |  |  |
Impairment, Long-Lived Asset, Held-for-Use, Statement of Income or Comprehensive Income [Extensible Enumeration] |  |  | Amortization of intangible assets | Amortization of intangible assets | Amortization of intangible assets |  |  |  |  |
Australia, Dollars | Foreign currency translation adjustment |  |  |  |  |  |  |  |  |  |
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items] |  |  |  |  |  |  |  |  |  |
Shareholders' equity |  |  | $ 18,200 |  |  |  |  |  |  |
United Kingdom, Pounds | Foreign currency translation adjustment |  |  |  |  |  |  |  |  |  |
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items] |  |  |  |  |  |  |  |  |  |
Shareholders' equity |  |  | 13,300 |  |  |  |  |  |  |
Aidvantage |  |  |  |  |  |  |  |  |  |
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items] |  |  |  |  |  |  |  |  |  |
Maximum payment |  |  |  |  |  |  |  |  | $ 65,000 |
Contingent consideration liability |  |  | 7,500 | $ 7,500 |  |  |  |  |  | $ 18,500
BZ Bodies Limited |  |  |  |  |  |  |  |  |  |
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items] |  |  |  |  |  |  |  |  |  |
Maximum payment |  |  |  |  |  |  | $ 2,500 | £ 2.0 |  |
Contingent consideration liability |  |  |  | 2,500 |  | £ 2.0 |  |  |  |
Payments of contingent consideration | $ 2,500 | £ 2.0 |  |  |  |  |  |  |  |
U.S. Services and Outside the U.S. Services |  |  |  |  |  |  |  |  |  |
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items] |  |  |  |  |  |  |  |  |  |
Impairment of long-lived assets held-for-use |  |  | $ 0 | $ 9,500 | $ 0 |  |  |  |  |

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