Summary of Significant Accounting Policies - Revenue Recognition (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		21 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2024
Summary of Significant Accounting Policies
Revenues	$ 520,837	$ 470,284	$ 1,505,886	$ 1,353,869
Percentage of impact on total revenue					2.00%
School operating losses included in the entity's revenue	3,300	2,700	$ 11,600	19,200
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	$ 147,600	$ 126,000	$ 426,300	$ 374,300