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, 2014			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			27,361,000
Balance at Jun. 30, 2015	580,918		$ 107,767	1,219,119	(10,057)	(735,911)
Net income	121,764			121,764
Net pension and postretirement benefit gains (losses), net of tax effect	(1,293)				(1,293)
Cash dividends - common stock	(190,546)			(190,546)
Purchase of treasury stock (in shares)			(2,000)
Purchase of treasury stock	(155)					(155)
Stock-based plans, including excess tax benefits (in shares)			65,000
Stock-based plans, including excess tax benefits	(416)		$ (416)
Stock-based compensation expense	$ 3,326		$ 3,326
Balance (in shares) at Jun. 30, 2016	27,423,550		27,424,000
Balance at Jun. 30, 2016	$ 513,598		$ 110,677	1,150,337	(11,350)	(736,066)
Net income	115,314	[1]		115,314
Net pension and postretirement benefit gains (losses), net of tax effect	2,414				2,414
Cash dividends - common stock	(58,980)			(58,980)
Purchase of treasury stock (in shares)			(6,000)
Purchase of treasury stock	(866)					(866)
Stock-based plans, including excess tax benefits (in shares)			30,000
Stock-based plans, including excess tax benefits	249		$ 249
Stock-based compensation expense	$ 4,248		$ 4,248
Balance (in shares) at Jun. 30, 2017	27,448,424		27,448,000
Balance at Jun. 30, 2017	$ 575,977		$ 115,174	$ 1,206,671	$ (8,936)	$ (736,932)

[1] Included in the third quarter and fiscal year net income is expense of $11.5 million, net of taxes, or approximately $0.42 per diluted share, related to a multiemployer pension settlement and other benefit-related costs.