Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements - Narrative (Details)

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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