Revenue recognition - Contract assets and liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Jun. 30, 2020
Revenue from Contract with Customer [Abstract]
Contract assets, current (included within Prepaid expenses and other)	$ 32,401	$ 30,827
Contract assets, noncurrent (included within Investments and other assets)	1,908	1,497
Total contract assets	34,309	32,324
Contract liabilities, current (included within Other accrued liabilities)	(49,360)	(51,278)
Contract liabilities, noncurrent (included within Other liabilities)	(3,420)	(3,232)
Total contract liabilities	(52,780)	(54,510)
Net contract liabilities	$ (18,471)	$ (22,186)