Finance and Operating Leases - Lease cost and other information (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2021
Finance lease cost:
Amortization of right-of-use assets	$ 39,312	$ 34,719	$ 28,647
Interest on lease liabilities	2,080	1,769	1,111
Total lease cost	56,911	57,329	51,563
Cash paid for amounts included in the measurement of lease liabilities
Operating cash flows from operating leases	(12,243)	(20,742)	(21,025)
Financing cash flows from finance leases	(42,956)	(33,011)	(24,315)
Right-of-use assets obtained in exchange for new finance lease liabilities	30,514	23,232	66,861
Right-of-use assets obtained in exchange for new operating lease liabilities	$ 1,619	$ 10,589	$ 1,643
Weighted-average remaining lease term - finance leases	1 year 8 months 19 days	1 year 10 months 6 days	2 years 6 months 7 days
Weighted-average remaining lease term - operating leases	6 years 1 month 6 days	6 years 6 months 14 days	6 years 6 months 29 days
Weighted-average discount rate - finance leases	3.86%	2.47%	2.45%
Weighted-average discount rate - operating leases	2.81%	2.75%	2.75%
Instructional Costs and Services
Finance lease cost:
Operating lease cost	$ 12,028	$ 15,718	$ 15,877
Short-term lease cost	103	67	181
Sublease income	(1,081)	(955)	(920)
Selling, general and administrative expenses
Finance lease cost:
Operating lease cost	4,616	6,253	6,681
Short-term lease cost	259	125	970
Sublease income	$ (406)	$ (367)	$ (984)