Consolidated Statements of Shareholders' Equity - USD ($) $ in Thousands	Total	Common Stock [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Loss
Beginning balance (in shares) at Jun. 30, 2015		28,214,153
Beginning balance, amount at Jun. 30, 2015	$ 808,985	$ 157,172	$ 716,315	$ (64,502)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	63,619		63,619
Unrealized gain on hedged transaction, net of tax	0
Foreign currency translation adjustment	(8,185)			(8,185)
Exercise of stock options and shares issued under share-based compensation plans, net of shares withheld for employee taxes (in shares)		284,730
Exercise of stock options and shares issued under share-based compensation plans, net of shares withheld for employee taxes	3,994	$ 3,994
Common stock repurchased (in shares)		(2,884,210)
Common stock repurchased	(100,751)	$ (100,751)
Share based compensation	7,093	7,093
Tax shortfall from exercise or vesting of share-based payment arrangements	(259)	$ (259)
Ending balance (in shares) at Jun. 30, 2016		25,614,673
Ending balance, amount at Jun. 30, 2016	774,496	$ 67,249	779,934	(72,687)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	69,246		69,246
Unrealized gain on hedged transaction, net of tax	13			13
Foreign currency translation adjustment	(530)			(530)
Exercise of stock options and shares issued under share-based compensation plans, net of shares withheld for employee taxes (in shares)		394,815
Exercise of stock options and shares issued under share-based compensation plans, net of shares withheld for employee taxes	$ 8,208	$ 8,208
Common stock repurchased (in shares)	(600,000)	(577,643)
Common stock repurchased	$ (20,335)	$ (20,335)
Share based compensation	6,578	6,578
Tax shortfall from exercise or vesting of share-based payment arrangements	$ (531)	$ (531)
Ending balance (in shares) at Jun. 30, 2017	25,431,845	25,431,845
Ending balance, amount at Jun. 30, 2017	$ 837,145	$ 61,169	849,180	(73,204)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	33,153		33,153
Unrealized gain on hedged transaction, net of tax	1,089			1,089
Foreign currency translation adjustment	(12,062)			(12,062)
Exercise of stock options and shares issued under share-based compensation plans, net of shares withheld for employee taxes (in shares)		161,277
Exercise of stock options and shares issued under share-based compensation plans, net of shares withheld for employee taxes	$ 636	$ 636
Common stock repurchased (in shares)	0
Share based compensation	$ 6,415	$ 6,415
Ending balance (in shares) at Jun. 30, 2018	25,593,122	25,593,122
Ending balance, amount at Jun. 30, 2018	$ 866,376	$ 68,220	$ 882,333	$ (84,177)