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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

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