Consolidated Statements of Shareholders' Equity - USD ($) $ in Thousands	Total	Class B stock $1 par value [Member]	Common stock par value $1 per share [Member]	Common stock par value $1 per share [Member] Class B stock $1 par value [Member]	Common stock par value $1 per share [Member] Common stock par value $1 per share [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Retained Earnings [Member] Class B stock $1 par value [Member]	Retained Earnings [Member] Common stock par value $1 per share [Member]	Accumulated Other Comprehensive Income (Loss) [Member]
Balance at Jun. 30, 2012	$ 797,445			$ 8,716	$ 35,791	$ 53,275	$ 722,778			$ (23,115)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	123,650						123,650
Other comprehensive income (loss), net of tax	6,774									6,774
Stock issued under various incentive plans, net of forfeitures	39,519				1,537	37,982
Purchases of Company stock	(54,734)			(7)	(1,471)	(53,256)	0
Share-based compensation	11,518					11,518
Conversion of Class B to common stock	0			(385)	385
Dividends paid		$ (13,331)	$ (57,196)					$ (13,331)	$ (57,196)
Tax benefit (deficiency) from incentive plans	651					651
Balance at Jun. 30, 2013	854,296			8,324	36,242	50,170	775,901			(16,341)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	113,541						113,541
Other comprehensive income (loss), net of tax	7,583									7,583
Stock issued under various incentive plans, net of forfeitures	58,885				1,550	57,335
Purchases of Company stock	(78,226)			(1)	(1,639)	(76,586)	0
Share-based compensation	12,224					12,224
Conversion of Class B to common stock	0			(623)	623
Dividends paid		(13,443)	(61,949)					(13,443)	(61,949)
Tax benefit (deficiency) from incentive plans	(1,259)					(1,259)
Balance at Jun. 30, 2014	891,652			7,700	36,776	41,884	814,050			(8,758)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	136,791						136,791
Other comprehensive income (loss), net of tax	(3,890)									(3,890)
Stock issued under various incentive plans, net of forfeitures	41,251				1,069	40,182
Purchases of Company stock	(46,764)			(1)	(924)	(45,839)	0
Share-based compensation	12,515					12,515
Conversion of Class B to common stock	0			(736)	736
Dividends paid		$ (12,706)	$ (67,276)					$ (12,706)	$ (67,276)
Tax benefit (deficiency) from incentive plans	277					277
Balance at Jun. 30, 2015	$ 951,850			$ 6,963	$ 37,657	$ 49,019	$ 870,859			$ (12,648)