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Commitments and Contingencies (Narrative) (Details)
$ in Thousands
 12 Months Ended
Sep. 30, 2018
USD ($)
Campus
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Operating Leased Assets [Line Items]      
Number Of Campus Properties Leased From Related Party | Campus 1    
Operating Leases, Rent Expense, Minimum Rentals $ 29,100 $ 27,800 $ 27,900
Rent expense includes rent paid to related parties 2,000 2,000 2,000
Educational Services And Facilities 182,589 181,027 194,395
Maximum License costs over seven years 2,300    
Net Prepaid Expenses from Excess of Credits Earned Over Credits Used 6,800 7,900  
Accrued tool sets 2,397 2,764  
Liability to vendor for vouchers redeemed by students 1,900 1,700  
Severance agreement amount committed $ 9,400    
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 $ 4,400    
Cash Surrender Value of Life Insurance 5,300 5,100  
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 $ 700 900 900
Licensing Agreement 2 [Member]      
Operating Leased Assets [Line Items]      
Educational Services And Facilities 1,600 1,600 1,700
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 $ 400 $ 400 $ 500
Surety Bond [Member]      
Operating Leased Assets [Line Items]      
Debt Instrument, Face Amount 19,500    
Debt Instrument, Collateral Amount 11,500    
Minimum [Member]      
Operating Leased Assets [Line Items]      
Employee agreement amount committed $ 1,800    
Severance agreement, term of benefits 6 months    
Maximum [Member]      
Operating Leased Assets [Line Items]      
Employee agreement amount committed $ 3,800    
Severance agreement, term of benefits 12 months