Consolidated Statements of Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Treasury Stock [Member]	Total
Balance at Jun. 30, 2013	$ 41,976	$ 37,199	$ 546,031	$ (65,280)	$ (268,938)	$ 290,988
Balance (in shares) at Jun. 30, 2013					15,435
Stock issued for employee stock option and purchase plans, including related income tax benefit and other		(441)			$ 3,895	3,454
Stock issued for employee stock option and purchase plans, including related income tax benefit and other (in shares)					(222)
Stock-based compensation		6,630				6,630
Treasury stock acquired (in shares)					132
Treasury stock acquired					$ (7,790)	(7,790)
Net income			42,866			42,866
Foreign currency translation gains (losses)				6,055		6,055
Pension and OPEB adjustments, net of tax				2,889		2,889
Change in fair value of derivatives, net of tax				517		517
Dividends declared			(4,883)			(4,883)
Balance at Jun. 30, 2014	41,976	43,388	584,014	(55,819)	$ (272,833)	340,726
Balance (in shares) at Jun. 30, 2014					15,345
Stock issued for employee stock option and purchase plans, including related income tax benefit and other		102			$ 2,682	2,784
Stock issued for employee stock option and purchase plans, including related income tax benefit and other (in shares)					(150)
Stock-based compensation		3,764				3,764
Treasury stock acquired (in shares)					138
Treasury stock acquired					$ (10,356)	(10,356)
Net income			54,743			54,743
Foreign currency translation gains (losses)				(23,133)		(23,133)
Pension and OPEB adjustments, net of tax				(14,280)		(14,280)
Change in fair value of derivatives, net of tax				215		215
Dividends declared			(5,893)			(5,893)
Balance at Jun. 30, 2015	41,976	47,254	632,864	(93,017)	$ (280,507)	348,570
Balance (in shares) at Jun. 30, 2015					15,333
Stock issued for employee stock option and purchase plans, including related income tax benefit and other		31			$ 1,725	1,756
Stock issued for employee stock option and purchase plans, including related income tax benefit and other (in shares)					(94)
Stock-based compensation		5,089				5,089
Treasury stock acquired (in shares)					71
Treasury stock acquired					$ (5,636)	(5,636)
Net income			52,056			52,056
Foreign currency translation gains (losses)				(11,303)		(11,303)
Pension and OPEB adjustments, net of tax				(13,450)		(13,450)
Change in fair value of derivatives, net of tax				(205)		(205)
Dividends declared			(6,918)			(6,918)
Balance at Jun. 30, 2016	$ 41,976	$ 52,374	$ 678,002	$ (117,975)	$ (284,418)	$ 369,959
Balance (in shares) at Jun. 30, 2016					15,310