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Summary of Significant Accounting Policies (Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2013
Sep. 30, 2012
Accounting Policies [Abstract]            
Revenue consisted of tuition 98.00% 98.00% 98.00%      
Expenses Incurred with bank and other services $ 1,300 $ 1,300 $ 1,500      
Maximum maturity period 90 days          
Goodwill $ 8,222 9,005 9,005      
Accrued Insurance 3,300          
Advertising Expenses 44,800 38,600 41,200      
Stock Based Compensation Expenses 1,864 2,995 4,904      
Tax Benefit 466 1,144 1,873      
Cash and cash equivalents 58,104 50,138 119,045 $ 29,438    
Restricted cash $ 14,055 14,822        
Percentage of cash basis revenue collected from funds distributed under Title IV programs 65.00%          
Percentage of Cash Basis Revenue Collected from Funds Distributed Under Veterans Benefits Programs 17.00%          
Equity Method Investments $ 4,206 $ 4,112 $ 4,036   $ 4,000 $ 4,000