Finance and Operating Leases - Lease cost and other information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2024	Mar. 31, 2023
Finance lease cost:
Amortization of right-of-use assets	$ 7,775	$ 9,853	$ 23,760	$ 29,804
Interest on lease liabilities	887	609	1,870	1,504
Total lease cost	12,008	13,572	37,344	41,427
Cash paid for amounts included in the measurement of lease liabilities
Operating cash flows from operating leases	(3,108)	(2,636)	(11,695)	(8,602)
Financing cash flows from finance leases	(9,721)	(11,300)	(32,212)	(31,238)
Right-of-use assets obtained in exchange for new finance lease liabilities	6,220	$ 4,213	32,497	29,425
Right-of-use assets obtained in exchange for new operating lease liabilities	$ 180		$ 805	$ 576
Weighted-average remaining lease term - finance leases	2 years 1 month 2 days	1 year 10 months 2 days	2 years 1 month 2 days	1 year 10 months 2 days
Weighted-average remaining lease term - operating leases	5 years 9 months 18 days	6 years 3 months	5 years 9 months 18 days	6 years 3 months
Weighted-average discount rate - finance leases	5.45%	3.66%	5.45%	3.66%
Weighted-average discount rate - operating leases	2.93%	2.78%	2.93%	2.78%
Instructional costs and services
Finance lease cost:
Operating lease cost	$ 2,363	$ 2,837	$ 7,284	$ 9,191
Short-term lease cost	10	24	42	79
Sublease income	(66)	(265)	(263)	(817)
Selling, general and administrative expenses
Finance lease cost:
Operating lease cost	1,146	584	4,891	1,756
Short-term lease cost	16	53	128	193
Sublease income	$ (123)	$ (123)	$ (368)	$ (283)