Income Taxes - Reconciliation of unrecognized tax benefits (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance July 1	$ 147,506	$ 139,907	$ 145,688
Additions for tax positions related to current year	4,195	4,735	7,025
Additions for tax positions of prior years	8,333	2,618	2,582
Additions for acquisitions	0	3,939	0
Reductions for tax positions of prior years	(3,790)	(1,175)	(627)
Reductions for settlements	(315)	(3,020)	(10,284)
Reductions for expiration of statute of limitations	(4,480)	(2,792)	(4,142)
Effect of foreign currency translation - increase	1,642	3,294
Effect of foreign currency translation - decrease			(335)
Balance June 30	$ 153,091	$ 147,506	$ 139,907