Summary of Significant Accounting Policies - Disaggregation of revenue (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2020 USD ($)	Mar. 31, 2019 USD ($)	Mar. 31, 2020 USD ($) item	Mar. 31, 2019 USD ($)
Summary of Significant Accounting Policies
Number of lines of business | item			3
Total Revenues	$ 257,154	$ 253,252	$ 771,834	$ 759,438
Managed Public School Programs
Summary of Significant Accounting Policies
Total Revenues	228,335	222,645	685,446	665,981
Institutional
Summary of Significant Accounting Policies
Total Revenues	16,753	21,306	57,038	66,913
Non-managed Public School Programs
Summary of Significant Accounting Policies
Total Revenues	8,173	12,776	26,792	37,398
Institutional Software & Services
Summary of Significant Accounting Policies
Total Revenues	8,580	8,530	30,246	29,515
Private Pay Schools and Other
Summary of Significant Accounting Policies
Total Revenues	$ 12,066	$ 9,301	$ 29,350	$ 26,544