Consolidated Statements Of Shareholders' Equity - USD ($) $ in Thousands	Total	Common Stock Outstanding [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Loss [Member]	Treasury Stock [Member]
Balance (in shares) at Jun. 30, 2012		27,287,000
Balance at Jun. 30, 2012	$ 564,267	$ 100,015	$ 1,208,027	$ (12,162)	$ (731,613)
Net income	109,249		109,249
Net pension and postretirement benefit gains (losses), net of tax effect	3,771			3,771
Cash dividends - common stock	(178,063)		(178,063)
Purchase of treasury stock (in shares)		(8,000)
Purchase of treasury stock	(609)				(609)
Stock-based plans, including excess tax benefits (in shares)		45,000
Stock-based plans, including excess tax benefits	(294)	$ (294)
Stock-based compensation expense	2,901	$ 2,901
Balance (in shares) at Jun. 30, 2013		27,324,000
Balance at Jun. 30, 2013	501,222	$ 102,622	1,139,213	(8,391)	(732,222)
Net income	74,986		74,986
Net pension and postretirement benefit gains (losses), net of tax effect	330			330
Cash dividends - common stock	(46,988)		(46,988)
Purchase of treasury stock (in shares)		(42,000)
Purchase of treasury stock	(3,120)				(3,120)
Stock-based plans, including excess tax benefits (in shares)		57,000
Stock-based plans, including excess tax benefits	(305)	$ (305)
Stock-based compensation expense	$ 2,472	$ 2,472
Balance (in shares) at Jun. 30, 2014	27,339,421	27,339,000
Balance at Jun. 30, 2014	$ 528,597	$ 104,789	1,167,211	(8,061)	(735,342)
Net income	101,686		101,686
Net pension and postretirement benefit gains (losses), net of tax effect	(1,996)			(1,996)
Cash dividends - common stock	(49,778)		(49,778)
Purchase of treasury stock (in shares)		(6,000)
Purchase of treasury stock	(569)				(569)
Stock-based plans, including excess tax benefits (in shares)		28,000
Stock-based plans, including excess tax benefits	(62)	$ (62)
Stock-based compensation expense	$ 3,040	$ 3,040
Balance (in shares) at Jun. 30, 2015	27,360,581	27,361,000
Balance at Jun. 30, 2015	$ 580,918	$ 107,767	$ 1,219,119	$ (10,057)	$ (735,911)