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Summary of Significant Accounting Policies - Concentration Risk and Inventories (Details)
$ in Thousands
12 Months Ended
Jun. 30, 2019
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
Jun. 30, 2016
USD ($)
Jul. 01, 2018
USD ($)
Concentration of revenues          
Concentration risk (as a percent) 10.00% 10.00% 10.00%    
Accounts receivable $ 191,639 $ 176,319     $ 176,319
Deposits and other assets 48,330 41,887      
Current and long-term balance 25,100        
Inventories          
Inventory deemed long-term and included in deposits and other assets 4,100 5,200      
Increase (decrease) in provision for excess and obsolete inventory 600   $ (300) $ 1,200  
Excess and obsolete inventory reserve $ 4,100 3,500      
Agora          
Concentration of revenues          
Accounts receivable   $ 28,700      
Settlement repayment period   4 years      
Revenue | Customer Concentration Risk          
Concentration of revenues          
Number of customers with concentration 1 0 0    
Revenue | Customer Concentration Risk | Managed Schools          
Concentration of revenues          
Concentration risk (as a percent) 88.00% 85.00%   83.00%  
Agora          
Concentration of revenues          
Deposits and other assets   $ 23,200