Summary of Significant Accounting Policies - Disaggregation of revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2023	Dec. 31, 2022
Summary of Significant Accounting Policies
Total Revenues	$ 504,868	$ 458,435	$ 985,049	$ 883,585
General Education
Summary of Significant Accounting Policies
Percentage of revenues from funding-based contracts	93.00%	90.00%	93.00%	90.00%
Total Revenues	$ 313,902	$ 274,764
Career Learning
Summary of Significant Accounting Policies
Total Revenues	$ 190,966	$ 183,671
Middle - High School
Summary of Significant Accounting Policies
Percentage of revenues from funding-based contracts	99.00%	100.00%	100.00%	99.00%
Total Revenues	$ 165,080	$ 153,795
Adult
Summary of Significant Accounting Policies
Total Revenues	$ 25,886	$ 29,876