Income Taxes - Reconciliation of unrecognized tax benefits (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2018
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance July 1	$ 140,662	$ 153,091	$ 147,506
Additions for tax positions related to current year	4,955	2,272	4,195
Additions for tax positions of prior years	798	45	8,333
Additions for acquisitions	43,532		0
Reductions for tax positions of prior years	(41,726)	(927)	(3,790)
Reductions for settlements	(53,520)	(832)	(315)
Reductions for expiration of statute of limitations	(3,820)	(9,388)	(4,480)
Effect of foreign currency translation - decrease	(4,604)	(3,599)
Effect of foreign currency translation - increase			1,642
Balance June 30	$ 86,277	$ 140,662	$ 153,091