Finance and Operating Leases - Lease cost and other information (Details) - USD ($) $ in Thousands	3 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Finance lease cost:
Amortization of right-of-use assets	$ 9,934	$ 7,620
Interest on lease liabilities	388	417
Total lease cost	14,379	13,200
Cash paid for amounts included in the measurement of lease liabilities
Operating cash flows from operating leases	(2,605)	(5,321)
Financing cash flows from finance leases	(9,314)	(7,020)
Right-of-use assets obtained in exchange for new finance lease liabilities	19,907	13,983
Right-of-use assets obtained in exchange for new operating lease liabilities	$ 576	$ 6,805
Weighted-average remaining lease term - finance leases	1 year 9 months 25 days	2 years 3 months 21 days
Weighted-average remaining lease term - operating leases	6 years 6 months 3 days	6 years 9 months 18 days
Weighted-average discount rate - finance leases	3.00%	2.37%
Weighted-average discount rate - operating leases	2.77%	2.79%
Instructional Costs and Services
Finance lease cost:
Operating lease cost	$ 3,715	$ 3,935
Short-term lease cost	24	18
Sublease income	(282)	(332)
Selling, general and administrative expenses
Finance lease cost:
Operating lease cost	586	1,667
Short-term lease cost	94	4
Sublease income	$ (80)	$ (129)