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Summary of Significant Accounting Policies - Narrative (Details) - USD ($)
12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
Dec. 01, 2022
Sep. 30, 2021
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Repayment term 10 years        
Loan processing fee $ 1,200,000 $ 1,000,000 $ 1,100,000    
Goodwill 28,459,000 $ 28,459,000 $ 16,859,000    
Accrued insurance $ 4,800,000        
Revenue consisted of tuition 99.00% 99.00% 99.00%    
Advertising and marketing expenses $ 78,300,000 $ 72,200,000 $ 54,500,000    
Stock based compensation expenses 8,560,000 3,848,000 4,412,000    
Tax benefit related to stock-based compensation 2,140,000 962,000 1,103,000    
Cash and cash equivalents 161,900,000 151,547,000 66,452,000   $ 133,721,000
Restricted cash 5,572,000 $ 5,377,000 $ 3,544,000   $ 12,256,000
Held-to-maturity investments $ 0        
Percentage of cash basis revenue collected from funds distributed under Title IV programs 78.00%        
Concorde          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Goodwill       $ 11,600,000  
Minimum          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Market interest rates 6.00%        
Retail installment contracts, stated interest rate 0.00%        
Minimum | Concorde          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Retail installment contracts, stated interest rate 0.00%        
Maximum          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Market interest rates 10.00%        
Retail installment contracts, stated interest rate 9.00%        
Maximum | Concorde          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Retail installment contracts, period due 5 years        
Retail installment contracts, stated interest rate 15.00%