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Summary of Significant Accounting Policies - Concentration Risk and Inventories (Details) - USD ($)
$ in Thousands
12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2018
Concentration of revenues      
Accounts receivable $ 236,134 $ 191,639  
Deposits and other assets 71,824 48,330  
Current and long-term balance 18,600    
Inventories      
Inventory deemed long-term and included in deposits and other assets 5,200 4,100  
Increase (decrease) in provision for excess and obsolete inventory 700 600 $ 1,200
Excess and obsolete inventory reserve $ 4,800 $ 4,100  
Revenue | Customer Concentration Risk      
Concentration of revenues      
Concentration risk (as a percent) 10.00% 10.00% 10.00%
Revenue | Customer Concentration Risk | Managed Schools      
Concentration of revenues      
Concentration risk (as a percent) 88.00% 88.00% 85.00%
Number of customers with concentration 0 1 0
Agora      
Concentration of revenues      
Accounts receivable     $ 28,700
Settlement repayment period     4 years
Deposits and other assets     $ 23,200