Consolidated Statements of Stockholders' Equity (USD $) In Thousands, except Share data	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Treasury Stock [Member]	Total
Balance, June 30 at Jun. 30, 2011	$ 41,976	$ 33,228	$ 477,726	$ (44,928)	$ (262,389)	$ 245,613
Balance, June 30 (in Shares) at Jun. 30, 2011					15,536,000
Stock issued for employee stock option and purchase plans, including related income tax benefit		(2,156)			3,875	1,719
Stock issued for employee stock option and purchase plans, including related income tax benefit (in Shares)					(229,000)
Stock-based compensation		3,856				3,856
Treasury stock acquired					(5,521)	(5,521)
Treasury stock acquired (in Shares)					154,000
Net Income			30,905			30,905
Foreign currency translation adjustment				(7,847)		(7,847)
Pension and OPEB adjustments, net of tax of				(21,625)		(21,625)
Change in fair value of derivatives, net of tax of				(725)		(725)
Dividends paid			(3,468)			(3,468)
Balance, June 30 at Jun. 30, 2012	41,976	34,928	505,163	(75,125)	(264,035)	242,907
Balance, June 30 (in Shares) at Jun. 30, 2012					15,461,000
Stock issued for employee stock option and purchase plans, including related income tax benefit		(1,072)			3,606	2,534
Stock issued for employee stock option and purchase plans, including related income tax benefit (in Shares)					(210,000)
Stock-based compensation		3,343				3,343
Treasury stock acquired					(8,509)	(8,509)
Treasury stock acquired (in Shares)					184,000
Net Income			44,848			44,848
Foreign currency translation adjustment				(4,025)		(4,025)
Pension and OPEB adjustments, net of tax of				13,340		13,340
Change in fair value of derivatives, net of tax of				530		530
Dividends paid			(3,980)			(3,980)
Balance, June 30 at Jun. 30, 2013	41,976	37,199	546,031	(65,280)	(268,938)	290,988
Balance, June 30 (in Shares) at Jun. 30, 2013					15,435,000
Stock issued for employee stock option and purchase plans, including related income tax benefit		(441)			3,895	3,454
Stock issued for employee stock option and purchase plans, including related income tax benefit (in Shares)					(222,000)
Stock-based compensation		6,630				6,630
Treasury stock acquired					(7,790)	(7,790)
Treasury stock acquired (in Shares)					132,000
Net Income			42,866			42,866
Foreign currency translation adjustment				6,055		6,055
Pension and OPEB adjustments, net of tax of				2,889		2,889
Change in fair value of derivatives, net of tax of				517		517
Dividends paid			(4,883)			(4,883)
Balance, June 30 at Jun. 30, 2014	$ 41,976	$ 43,388	$ 584,014	$ (55,819)	$ (272,833)	$ 340,726
Balance, June 30 (in Shares) at Jun. 30, 2014					15,345,000