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, 2016	$ 41,976	$ 52,374	$ 678,002	$ (117,975)	$ (284,418)	$ 369,959
Balance (in shares) at Jun. 30, 2016					15,310
Stock issued for employee stock option and purchase plans, including related income tax benefit and other		(614)			$ 1,462	848
Stock issued for employee stock option and purchase plans, including related income tax benefit and other (in shares)					(78)
Stock-based compensation		5,023				5,023
Treasury stock acquired (in shares)					90
Treasury stock acquired					$ (7,806)	(7,806)
Net Loss			46,545			46,545
Foreign currency translation gains (losses)				(472)		(472)
Pension and OPEB adjustments, net of tax				6,052		6,052
Change in fair value of derivatives, net of tax				(3,543)		(3,543)
Dividends declared			(7,942)			(7,942)
Balance at Jun. 30, 2017	41,976	56,783	716,605	(115,938)	$ (290,762)	408,664
Balance (in shares) at Jun. 30, 2017					15,322
Stock issued for employee stock option and purchase plans, including related income tax benefit and other		(417)			$ 1,334	917
Stock issued for employee stock option and purchase plans, including related income tax benefit and other (in shares)					(70)
Stock-based compensation		4,962				4,962
Treasury stock acquired (in shares)					27
Treasury stock acquired					$ (2,652)	(2,652)
Net Loss			36,604			36,604
Foreign currency translation gains (losses)				94		93
Pension and OPEB adjustments, net of tax				8,748		8,748
Change in fair value of derivatives, net of tax				2,452		2,452
Dividends declared			(8,994)			(8,994)
Adoption of ASU 2018-02			17,215	(17,215)
Balance at Jun. 30, 2018	41,976	61,328	761,430	(121,859)	$ (292,080)	450,795
Balance (in shares) at Jun. 30, 2018					15,279
Stock issued for employee stock option and purchase plans, including related income tax benefit and other		(163)			$ 1,292	1,129
Stock issued for employee stock option and purchase plans, including related income tax benefit and other (in shares)					(67)
Treasury stock acquired (in shares)					438
Treasury stock acquired					$ (33,394)	(33,394)
Net Loss			67,914			67,914
Foreign currency translation gains (losses)				(2,645)		(2,645)
Pension and OPEB adjustments, net of tax				(12,268)		(12,268)
Change in fair value of derivatives, net of tax				(506)		(506)
Dividends declared			(9,955)			(9,955)
Stock-based compensation		4,350				4,350
Adoption of ASC 606			(1,107)			(1,107)
Balance at Jun. 30, 2019	$ 41,976	$ 65,515	$ 818,282	$ (137,278)	$ (324,182)	$ 464,313
Balance (in shares) at Jun. 30, 2019					15,650