Consolidated Statements of Shareholders' Equity - USD ($) $ in Thousands	Total	Common Stock [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]
Beginning Balance, Shares at Jun. 30, 2013		27,971,809
Beginning Balance, Amount at Jun. 30, 2013	$ 695,956	$ 149,821	$ 569,107	$ (22,972)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	81,789		81,789
Foreign currency translation adjustment	6,272			6,272
Exercise of stock options and shares issued under share-based compensation plans, net of shares withheld for employee taxes, shares		567,672
Exercise of stock options and shares issued under share-based compensation plans, net of shares withheld for employee taxes	12,581	$ 12,581
Share based compensation	5,328	5,328
Tax benefit (shortfall) of deductible compensation arising from exercise or vesting of share based payment arrangements	717	$ 717
Ending Balance, Shares at Jun. 30, 2014		28,539,481
Ending Balance, Amount at Jun. 30, 2014	802,643	$ 168,447	650,896	(16,700)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	65,419		65,419
Foreign currency translation adjustment	(47,802)			(47,802)
Exercise of stock options and shares issued under share-based compensation plans, net of shares withheld for employee taxes, shares		154,497
Exercise of stock options and shares issued under share-based compensation plans, net of shares withheld for employee taxes	760	$ 760
Common stock repurchased, shares		(479,825)
Common stock repurchased	(18,768)	$ (18,768)
Share based compensation	6,517	6,517
Tax benefit (shortfall) of deductible compensation arising from exercise or vesting of share based payment arrangements	$ 216	$ 216
Ending Balance, Shares at Jun. 30, 2015	28,214,153	28,214,153
Ending 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
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, 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, shares		(2,884,210)
Common stock repurchased	(100,751)	$ (100,751)
Share based compensation	7,093	7,093
Tax benefit (shortfall) of deductible compensation arising from exercise or vesting of share based payment arrangements	$ (259)	$ (259)
Ending Balance, Shares at Jun. 30, 2016	25,614,673	25,614,673
Ending Balance, Amount at Jun. 30, 2016	$ 774,496	$ 67,249	$ 779,934	$ (72,687)