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Acquisitions - Narrative (Details)
 7 Months Ended 12 Months Ended
Dec. 01, 2022
USD ($)
state
student
campus
Nov. 01, 2021
USD ($)
Jun. 30, 2023
USD ($)
state
campus
program
Sep. 30, 2022
USD ($)
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 $ 16,859,000 $ 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        
Business combination, acquisition related costs 5,300,000        
Transaction costs     $ 2,300,000 3,000,000  
Adjustment to operating lease liabilities     7,200,000    
Goodwill 11,600,000   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      
Intangible asset impairment charge       $ 2,000,000  
MIAT College of Technology | Trademarks, trade names and other          
Business Combination Segment Allocation [Line Items]          
Weighted Average Remaining Useful Life (Years)       4 years  
Fair value of intangible asset       $ 1,000,000