Summary of Significant Accounting Policies - Disaggregation of revenue (Details) $ in Thousands	12 Months Ended
	Jun. 30, 2023 USD ($) item	Jun. 30, 2022 USD ($)	Jun. 30, 2021 USD ($)
Summary of Significant Accounting Policies
Number of lines of business | item	2
Total Revenues	$ 1,837,358	$ 1,686,666	$ 1,536,760
General Education
Summary of Significant Accounting Policies
Percentage of revenues from funding-based contracts	90.00%	89.00%	88.00%
Total Revenues	$ 1,131,391	$ 1,273,783	$ 1,280,199
Career Learning
Summary of Significant Accounting Policies
Total Revenues	$ 705,967	$ 412,883	$ 256,561
Middle - High School
Summary of Significant Accounting Policies
Percentage of revenues from funding-based contracts	99.00%	99.00%	98.00%
Total Revenues	$ 586,770	$ 321,416	$ 200,774
Adult
Summary of Significant Accounting Policies
Total Revenues	$ 119,197	$ 91,467	$ 55,787