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Related Party Transactions (Details) - Future of School - USD ($)
$ in Millions
12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2018
Related Party Transactions      
Contributions made to related party $ 1.2 $ 1.4 $ 0.3
Due to related party $ 1.3    
Accrued contributions to related party   $ 2.5