Summary of Significant Accounting Policies - Property and Equipment and Leases (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2023	Dec. 31, 2022
Property and equipment
Equipment expense	$ 1,400	$ 600	$ 3,000	$ 1,800
Capitalized software development costs			$ 18,402	21,399
Capitalized Curriculum Development Costs
Amortization period of capitalized development costs			5 years
Capitalized curriculum development additions			$ 8,731	9,527
Minimum
Operating Leases
Operating leases initial term	1 year		1 year
Maximum
Finance Leases
Finance lease term	3 years		3 years
Operating Leases
Operating leases initial term	10 years		10 years
Instructional costs and services
Property and equipment
Depreciation expense	$ 7,700	10,300	$ 17,000	20,600
Amortization expense	8,400	7,400	16,700	13,100
Capitalized Curriculum Development Costs
Amortization expense	4,400	4,100	9,000	8,200
Selling, general and administrative expenses
Property and equipment
Depreciation expense	1,000	1,000	2,100	2,600
Amortization expense	1,900	1,300	3,600	2,700
Student and state testing computers and printers
Property and equipment
Accelerated depreciation	$ 1,300	$ 1,400	$ 2,300	$ 3,100
Student and state testing computers and printers | Minimum
Property and equipment
Useful Life	3 years		3 years
Student and state testing computers and printers | Maximum
Property and equipment
Useful Life	5 years		5 years
Computer hardware | Minimum
Property and equipment
Useful Life	3 years		3 years
Computer hardware | Maximum
Property and equipment
Useful Life	7 years		7 years
Computer software | Minimum
Property and equipment
Useful Life	3 years		3 years
Computer software | Maximum
Property and equipment
Useful Life	5 years		5 years
Web site development
Property and equipment
Useful Life	3 years		3 years
Office equipment
Property and equipment
Useful Life	5 years		5 years
Furniture and fixtures
Property and equipment
Useful Life	7 years		7 years
Capitalized software
Property and equipment
Useful Life	3 years		3 years
Buildings | Minimum
Operating Leases
Operating leases initial term	1 year		1 year
Buildings | Maximum
Operating Leases
Operating leases initial term	10 years		10 years