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Shareholders' Equity (Summary of Operating Expense Line and the Impact on Net Income) (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total stock-based compensation expense $ 1,864 $ 2,995 $ 4,904
Income tax benefit 466 1,144 1,873
Educational Services and Facilities [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total stock-based compensation expense 0 166 280
Selling, General and Administrative Expenses [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total stock-based compensation expense $ 1,864 $ 2,829 $ 4,624