Finance and Operating Leases - Lease cost and other information (Details) $ in Thousands	3 Months Ended	9 Months Ended
	Mar. 31, 2020 USD ($)	Mar. 31, 2020 USD ($)
Finance lease cost:
Amortization of right-of-use assets	$ 4,232	$ 12,418
Interest on lease liabilities	276	657
Operating lease cost	4,035	7,370
Short-term lease cost	280	987
Sublease income	(215)	(531)
Total lease cost	8,608	20,901
Cash paid for amounts included in the measurement of lease liabilities
Operating cash flows from operating leases	(4,062)	(8,151)
Financing cash flows from finance leases	(6,644)	(21,603)
Right-of-use assets obtained in exchange for new finance lease liabilities	3,715	16,490
Right-of-use assets obtained in exchange for new operating lease liabilities	$ 502	$ 5,349
Weighted-average remaining lease term - finance leases	10 months 24 days	10 months 24 days
Weighted-average remaining lease term - operating leases	7 years 3 months 25 days	7 years 3 months 25 days
Weighted-average discount rate - finance leases	2.88%	2.88%
Weighted-average discount rate - operating leases	2.78%	2.78%