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Long Term Debt (Details) - USD ($)
1 Months Ended 9 Months Ended
Nov. 03, 2020
Sep. 30, 2023
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Debt Instrument [Line Items]          
Money market funds   $ 167,707,000 $ 167,707,000 $ 262,757,000 $ 213,667,000
Repayments of revolving credit facility     40,000,000 0  
Revolving Credit Facility          
Debt Instrument [Line Items]          
Repayments of revolving credit facility   40,000,000      
Revolving credit facility, outstanding   61,200,000 61,200,000   101,400,000
Interest paid     5,400,000 $ 3,000,000  
Revolving Credit Facility | Australia, Dollars          
Debt Instrument [Line Items]          
Revolving credit facility, outstanding   $ 3,200,000 $ 3,200,000   $ 3,400,000
Revolving Credit Facility | Minimum          
Debt Instrument [Line Items]          
Unused commitment fee 0.20%        
Revolving Credit Facility | Minimum | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate          
Debt Instrument [Line Items]          
Margin rate 1.50%        
Revolving Credit Facility | Maximum          
Debt Instrument [Line Items]          
Unused commitment fee 0.30%        
Revolving Credit Facility | Maximum | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate          
Debt Instrument [Line Items]          
Margin rate 2.00%        
Amended Credit Facility | Revolving Credit Facility          
Debt Instrument [Line Items]          
Revolving credit facility, value $ 350,000,000        
Maximum aggregate incremental term loans $ 300,000,000        
Percentage of consolidated EBITDA to be funded 100.00%        
Maximum leverage ratio allowed in order to increase obligation 1.75        
Debt financing costs $ 1,900,000        
Debt instrument term 5 years        
Maximum total leverage ratio 2.00        
Money market funds $ 150,000,000        
Minimum coverage ratio 1.75        
Minimum department of education financial composite score 1.0        
Minimum department of education financial composite score for two consecutive fiscal years 1.5        
Amendment to the Credit Facility, Subfacility for Borrowings in Foreign Currencies | Revolving Credit Facility          
Debt Instrument [Line Items]          
Revolving credit facility, value $ 150,000,000