Summary of Significant Accounting Policies - Disaggregation of revenue (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2024 USD ($) item	Mar. 31, 2023 USD ($)	Mar. 31, 2024 USD ($) item	Mar. 31, 2023 USD ($)
Summary of Significant Accounting Policies
Number of lines of revenue | item	2		2
Total Revenues	$ 520,837	$ 470,284	$ 1,505,886	$ 1,353,869
General Education
Summary of Significant Accounting Policies
Percentage of revenues from funding-based contracts	94.00%	90.00%	93.00%	90.00%
Total Revenues	$ 328,894	$ 289,566
Career Learning
Summary of Significant Accounting Policies
Total Revenues	$ 191,943	$ 180,718
Middle - High School
Summary of Significant Accounting Policies
Percentage of revenues from funding-based contracts	99.00%	99.00%	100.00%	99.00%
Total Revenues	$ 167,919	$ 150,772
Adult
Summary of Significant Accounting Policies
Total Revenues	$ 24,024	$ 29,946