Finance and Operating Leases - Lease cost and other information (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2022
Finance lease cost:
Amortization of right-of-use assets	$ 31,099	$ 39,312	$ 34,719
Interest on lease liabilities	2,639	2,080	1,769
Total lease cost	48,749	56,911	57,329
Cash paid for amounts included in the measurement of lease liabilities
Operating cash flows from operating leases	(14,990)	(12,243)	(20,742)
Financing cash flows from finance leases	(40,919)	(42,956)	(33,011)
Right-of-use assets obtained in exchange for new finance lease liabilities	35,652	30,514	23,232
Right-of-use assets obtained in exchange for new operating lease liabilities	$ 864	$ 1,619	$ 10,589
Weighted-average remaining lease term - finance leases	2 years 7 days	1 year 8 months 19 days	1 year 10 months 6 days
Weighted-average remaining lease term - operating leases	5 years 7 months 28 days	6 years 1 month 6 days	6 years 6 months 14 days
Weighted-average discount rate - finance leases	5.62%	3.86%	2.47%
Weighted-average discount rate - operating leases	2.92%	2.81%	2.75%
Instructional costs and services
Finance lease cost:
Operating lease cost	$ 9,605	$ 12,028	$ 15,718
Short-term lease cost	56	103	67
Sublease income	(328)	(1,081)	(955)
Selling, general and administrative expenses
Finance lease cost:
Operating lease cost	6,019	4,616	6,253
Short-term lease cost	150	259	125
Sublease income	$ (491)	$ (406)	$ (367)