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Summary of Significant Accounting Policies (Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2017
Accounting Policies [Abstract]      
Revenue consisted of tuition 99.00% 98.00% 98.00%
Expenses Incurred with bank and other services $ 1,100 $ 1,300 $ 1,300
Goodwill 8,222 8,222 9,005
Accrued Insurance 4,500    
Advertising Expenses 41,200 44,800 38,600
Stock Based Compensation Expenses 1,440 1,864 2,995
Tax Benefit 360 466 1,144
Cash and cash equivalents 65,442 58,104 50,138
Restricted cash $ 15,113 $ 14,055 $ 14,822
Maximum maturity period 90 days    
Percentage of cash basis revenue collected from funds distributed under Title IV programs 67.00%    
Percentage of Cash Basis Revenue Collected from Funds Distributed Under Veterans Benefits Programs 15.00%