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Acquisitions - Narrative (Details)
 12 Months Ended
Dec. 01, 2022
USD ($)
student
campus
program
state
Nov. 01, 2021
USD ($)
Sep. 30, 2024
USD ($)
state
campus
Sep. 30, 2023
USD ($)
Sep. 30, 2022
USD ($)
Sep. 30, 2021
USD ($)
Business Combination Segment Allocation [Line Items]            
Number of campuses through which undergraduate degree, diploma and certificate programs are offered | campus     16      
Number of states | state     9      
Goodwill     $ 28,459,000 $ 28,459,000 $ 16,859,000  
Concorde            
Business Combination Segment Allocation [Line Items]            
Number of campuses through which undergraduate degree, diploma and certificate programs are offered | campus 17          
Number of states | state 8          
Number of students | student 7,600          
Number of programs | program 20          
Base purchase price $ 50,000,000          
Working capital 1,900,000          
Purchase consideration 48,100,000          
Transaction costs 5,300,000     $ 2,300,000 3,000,000  
Adjustment to income tax receivable     100,000      
Adjustment to deferred income taxes     600,000      
Adjustment to property and equipment     $ 700,000      
Goodwill 11,600,000          
Goodwill expected to be deductible for tax purposes 0          
Receivables acquired 2,300,000          
Allowance for credit losses on PCD assets $ 1,000,000          
MIAT College Of Technology            
Business Combination Segment Allocation [Line Items]            
Base purchase price   $ 26,000,000        
Working capital   2,800,000        
Purchase consideration   28,800,000        
Transaction costs   1,700,000     $ 900,000 $ 800,000
Goodwill   8,637,000        
Goodwill expected to be deductible for tax purposes   $ 600,000