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Commitments and Contingencies (Narrative) (Details)
$ in Thousands
12 Months Ended
Sep. 30, 2019
USD ($)
Campus
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Operating Leased Assets [Line Items]      
Number Of Campus Properties Leased From Related Party | Campus 1    
Operating Leases, Rent Expense, Minimum Rentals $ 28,500 $ 29,100 $ 27,800
Rent expense includes rent paid to related parties 2,000 2,000 2,000
Educational Services And Facilities 178,317 182,589 181,027
Maximum License costs over seven years 2,300    
Net Prepaid Expenses from Excess of Credits Earned Over Credits Used 6,400 6,800  
Accrued tool sets 2,586 2,397  
Liability to vendor for vouchers redeemed by students 2,100 1,900  
Severance agreement amount committed $ 8,300    
Maximum contribution per employee percentage of regular compensation 75.00%    
Maximum contribution per employee percentage of incentive compensation 100.00%    
Maximum contribution per non-employee percentage of cash compensation 100.00%    
Deferred compensation contributions, vesting period 5 years    
Obligation under the plan $ 4,300 4,400  
Cash Surrender Value of Life Insurance 4,800 5,300  
John C. and Cynthia L. White [Member]      
Operating Leased Assets [Line Items]      
Operating Leases, Rent Expense, Minimum Rentals $ 300    
Minimum Annual Rent Increase 4.00%    
Delegates LLC [Member]      
Operating Leased Assets [Line Items]      
Operating Leases, Rent Expense, Minimum Rentals $ 700    
Minimum Annual Rent Increase 4.00%    
Licensing Agreement 1 [Member]      
Operating Leased Assets [Line Items]      
Educational Services And Facilities $ 600 700 900
Licensing Agreement 2 [Member]      
Operating Leased Assets [Line Items]      
Educational Services And Facilities 1,400 1,600 1,600
Minimum Royalty Payments under Licensing Agreements 1,600    
Increase in Minimum Royalty Payments by Subsequent Year 50    
Licensing Agreement 3 [Member]      
Operating Leased Assets [Line Items]      
Educational Services And Facilities $ 100 100 100
Minimum notification of intent to terminate agreement 90 days    
Licensing Agreement Four [Member]      
Operating Leased Assets [Line Items]      
Educational Services And Facilities $ 200 $ 400 $ 400
Surety Bond [Member]      
Operating Leased Assets [Line Items]      
Debt Instrument, Face Amount 21,100    
Minimum      
Operating Leased Assets [Line Items]      
Employee agreement amount committed $ 2,000    
Severance agreement, term of benefits 6 months    
Maximum      
Operating Leased Assets [Line Items]      
Employee agreement amount committed $ 2,600    
Severance agreement, term of benefits 12 months