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Segment Information (Details) - USD ($)
$ in Thousands
 3 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Sep. 30, 2020
Segment Reporting Information [Line Items]      
Revenues $ 76,125 $ 87,234  
Income (loss) from operations 775 4,254  
Depreciation and amortization 3,282 3,013  
Net income 1,083 4,684  
Total assets 434,587   $ 441,981
Depreciation of training equipment obtained in exchange for services 317 332  
Operating Segments | Postsecondary Education      
Segment Reporting Information [Line Items]      
Revenues 73,560 83,320  
Income (loss) from operations 1,104 4,601  
Depreciation and amortization 3,258 2,971  
Net income 1,412 5,031  
Total assets 428,295   435,144
Corporate, Non-Segment | Other      
Segment Reporting Information [Line Items]      
Revenues 2,565 3,914  
Income (loss) from operations (329) (347)  
Depreciation and amortization 24 42  
Net income (329) $ (347)  
Total assets $ 6,292   $ 6,837