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Segment Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Jun. 30, 2022
Mar. 31, 2022
Dec. 31, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Jun. 30, 2022
Jun. 30, 2021
Sep. 30, 2021
Segment Reporting Information [Line Items]                  
Revenues $ 100,966     $ 83,768     $ 308,127 $ 237,602  
Income (loss) from operations 1,954     3,052     18,909 2,166  
Depreciation and amortization 4,561     3,619     12,124 10,470  
Net income 843 $ 7,354 $ 14,822 3,000 $ (1,547) $ 1,083 23,019 2,536  
Total assets 540,282           540,282   $ 512,570
Depreciation of training equipment obtained in exchange for services 200     300     691 922  
Operating Segments | Postsecondary Education                  
Segment Reporting Information [Line Items]                  
Revenues 97,511     80,736     297,863 229,142  
Income (loss) from operations 2,308     2,994     20,331 2,776  
Depreciation and amortization 4,534     3,599     12,045 10,404  
Net income 1,197     2,942     24,441 3,146  
Total assets 537,325           537,325   504,934
Corporate, Non-Segment | Other                  
Segment Reporting Information [Line Items]                  
Revenues 3,455     3,032     10,264 8,460  
Income (loss) from operations (354)     58     (1,422) (610)  
Depreciation and amortization 27     20     79 66  
Net income (354)     $ 58     (1,422) $ (610)  
Total assets $ 2,957           $ 2,957   $ 7,636