Maximus, Inc. Quarterly report pursuant to Section 13 or 15(d)

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 ($)
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