Leases - Lease expense and supplemental cash flow information (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Mar. 31, 2020	Mar. 31, 2020
Leases [Abstract]
Operating lease expense	$ 13,218	$ 38,048
Short-term lease cost	1,814	6,248
Variable lease cost	999	3,958
Total lease cost	16,031	48,254
Cash paid for amounts included in the measurement of operating lease liabilities	12,522	37,104
Right-of-use assets obtained in exchange for operating lease obligations	$ 3,262	$ 29,209