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, 2019		27,491,000
Balance at Jun. 30, 2019	$ 726,873	$ 122,844	$ 1,359,782	$ (10,308)	$ (745,445)
Net income	136,983		136,983
Net pension and postretirement benefit (losses) gains, net of tax effect	(1,762)			(1,762)
Cash dividends - common stock	(75,644)		(75,644)
Purchase of treasury stock (in shares)		(38,000)
Purchase of treasury stock	(5,459)				(5,459)
Stock-based plans (in shares)		71,000
Stock-based plans	(3,806)	$ (3,806)
Stock-based compensation expense	6,115	$ 6,115
Balance (in shares) at Jun. 30, 2020		27,524,000
Balance at Jun. 30, 2020	783,300	$ 125,153	1,421,121	(12,070)	(750,904)
Net income	142,332		142,332
Net pension and postretirement benefit (losses) gains, net of tax effect	3,817			3,817
Cash dividends - common stock	(81,233)		(81,233)
Purchase of treasury stock (in shares)		(46,000)
Purchase of treasury stock	(8,533)				(8,533)
Stock-based plans (in shares)		53,000
Stock-based plans	(3,662)	$ (3,662)
Stock-based compensation expense	$ 7,126	$ 7,126
Balance (in shares) at Jun. 30, 2021	27,531,040	27,531,000
Balance at Jun. 30, 2021	$ 843,147	$ 128,617	1,482,220	(8,253)	(759,437)
Net income	89,586		89,586
Net pension and postretirement benefit (losses) gains, net of tax effect	(2,919)			(2,919)
Cash dividends - common stock	(86,761)		(86,761)
Purchase of treasury stock (in shares)		(45,000)
Purchase of treasury stock	(7,563)				(7,563)
Stock-based plans (in shares)		34,000
Stock-based plans	(366)	$ (366)
Stock-based compensation expense	$ 9,563	$ 9,563
Balance (in shares) at Jun. 30, 2022	27,520,237	27,520,000
Balance at Jun. 30, 2022	$ 844,687	$ 137,814	$ 1,485,045	$ (11,172)	$ (767,000)