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Investment in Unconsolidated Affiliate - Equity Method Investment (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2018
Increase (Decrease) In Equity Investment [Roll Forward]      
Balance at beginning of period $ 4,338 $ 4,206  
Equity in earnings of unconsolidated affiliate 0 399 $ 385
Return of capital contribution from unconsolidated affiliate (261) (267) (291)
Balance at end of period 4,494 4,338 4,206
Other (expense) income, net      
Increase (Decrease) In Equity Investment [Roll Forward]      
Equity in earnings of unconsolidated affiliate   $ 399 $ 400
Education services and facilities      
Increase (Decrease) In Equity Investment [Roll Forward]      
Equity in earnings of unconsolidated affiliate $ 417