Condensed Consolidated Statements of Shareholders' Equity (Unaudited) - USD ($) $ in Thousands	Total	Common Stock [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Loss [Member]
Beginning balance (in shares) at Jun. 30, 2018		25,593,122
Beginning balance at Jun. 30, 2018	$ 866,376	$ 68,220	$ 882,333	$ (84,177)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	14,322		14,322
Unrealized loss on hedged transaction, net of tax	146			146
Foreign currency translation adjustment	(4,762)			(4,762)
Exercise of stock options and shares issued under share-based compensation plans, net of shares withheld for employee taxes (in shares)		14,542
Exercise of stock options and shares issued under share-based compensation plans, net of shares withheld for employee taxes	425	$ 425
Share-based compensation	1,390	$ 1,390
Ending balance (in shares) at Sep. 30, 2018		25,607,664
Ending balance at Sep. 30, 2018	877,897	$ 70,035	896,655	(88,793)
Beginning balance (in shares) at Jun. 30, 2018		25,593,122
Beginning balance at Jun. 30, 2018	866,376	$ 68,220	882,333	(84,177)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	46,019
Ending balance (in shares) at Mar. 31, 2019		25,705,842
Ending balance at Mar. 31, 2019	911,063	$ 72,903	928,352	(90,192)
Beginning balance (in shares) at Sep. 30, 2018		25,607,664
Beginning balance at Sep. 30, 2018	877,897	$ 70,035	896,655	(88,793)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	19,982		19,982
Unrealized loss on hedged transaction, net of tax	(615)			(615)
Foreign currency translation adjustment	1,363			1,363
Exercise of stock options and shares issued under share-based compensation plans, net of shares withheld for employee taxes (in shares)		104,065
Exercise of stock options and shares issued under share-based compensation plans, net of shares withheld for employee taxes	(321)	$ (321)
Common stock repurchased (in shares)		(9,387)
Common stock repurchased	(308)	$ (308)
Share-based compensation	1,506	$ 1,506
Ending balance (in shares) at Dec. 31, 2018		25,702,342
Ending balance at Dec. 31, 2018	899,504	$ 70,912	916,637	(88,045)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	11,715		11,715
Unrealized loss on hedged transaction, net of tax	(350)			(350)
Foreign currency translation adjustment	(1,797)			(1,797)
Exercise of stock options and shares issued under share-based compensation plans, net of shares withheld for employee taxes (in shares)		3,500
Exercise of stock options and shares issued under share-based compensation plans, net of shares withheld for employee taxes	(2)	$ (2)
Share-based compensation	1,993	$ 1,993
Ending balance (in shares) at Mar. 31, 2019		25,705,842
Ending balance at Mar. 31, 2019	911,063	$ 72,903	928,352	(90,192)
Beginning balance (in shares) at Jun. 30, 2019		25,408,397
Beginning balance at Jun. 30, 2019	914,129	$ 64,287	939,930	(90,088)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	11,530		11,530
Unrealized loss on hedged transaction, net of tax	(1,071)			(1,071)
Foreign currency translation adjustment	(14,639)			(14,639)
Exercise of stock options and shares issued under share-based compensation plans, net of shares withheld for employee taxes (in shares)		786
Exercise of stock options and shares issued under share-based compensation plans, net of shares withheld for employee taxes	(12)	$ (12)
Common stock repurchased (in shares)		(168,068)
Common stock repurchased	(5,432)	$ (5,432)
Share-based compensation	1,246	$ 1,246
Ending balance (in shares) at Sep. 30, 2019		25,241,115
Ending balance at Sep. 30, 2019	905,751	$ 60,089	951,460	(105,798)
Beginning balance (in shares) at Jun. 30, 2019		25,408,397
Beginning balance at Jun. 30, 2019	914,129	$ 64,287	939,930	(90,088)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	24,608
Unrealized loss on hedged transaction, net of tax	(4,217)
Ending balance (in shares) at Mar. 31, 2020		25,345,798
Ending balance at Mar. 31, 2020	897,678	$ 62,314	964,538	(129,174)
Beginning balance (in shares) at Sep. 30, 2019		25,241,115
Beginning balance at Sep. 30, 2019	905,751	$ 60,089	951,460	(105,798)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	11,366		11,366
Unrealized loss on hedged transaction, net of tax	900			900
Foreign currency translation adjustment	8,558			8,558
Exercise of stock options and shares issued under share-based compensation plans, net of shares withheld for employee taxes (in shares)		104,683
Exercise of stock options and shares issued under share-based compensation plans, net of shares withheld for employee taxes	(621)	$ (621)
Common stock repurchased	0
Share-based compensation	1,627	$ 1,627
Ending balance (in shares) at Dec. 31, 2019		25,345,798
Ending balance at Dec. 31, 2019	927,580	$ 61,095	962,825	(96,340)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	1,713		1,713
Unrealized loss on hedged transaction, net of tax	(4,046)			(4,046)
Foreign currency translation adjustment	(28,788)			(28,788)
Exercise of stock options and shares issued under share-based compensation plans, net of shares withheld for employee taxes (in shares)		0
Exercise of stock options and shares issued under share-based compensation plans, net of shares withheld for employee taxes	34	$ 34
Common stock repurchased	0
Share-based compensation	1,185	$ 1,185
Ending balance (in shares) at Mar. 31, 2020		25,345,798
Ending balance at Mar. 31, 2020	$ 897,678	$ 62,314	$ 964,538	$ (129,174)