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Revenue from Contracts with Customers (Details) - USD ($)
$ in Thousands
9 Months Ended
Jun. 30, 2022
Sep. 30, 2021
Revenue from Contract with Customer [Abstract]    
Revenue recognition period 12 months  
Receivables, which includes tuition and notes receivable $ 55,172 $ 46,489
Deferred revenue $ 42,682 $ 57,648