Summary of Significant Accounting Policies - Revenue Recognition (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2021	Dec. 31, 2020
Summary of Significant Accounting Policies
Revenues	$ 409,507	$ 376,145	$ 809,733	$ 747,105
School operating losses included in the entity's revenue	12,300	24,200	$ 25,200	44,200
Minimum
Summary of Significant Accounting Policies
Duration of contracts providing access to curriculum via the entity's Web site			1 year
Maximum
Summary of Significant Accounting Policies
Duration of contracts providing access to curriculum via the entity's Web site			2 years
Primary Obligor
Summary of Significant Accounting Policies
Revenues	$ 117,700	$ 102,400	$ 231,600	$ 212,100