Consolidated Statements of Shareholders' Equity (USD $) In Thousands, unless otherwise specified	Total	Common Stock $1 par value [Member]	Class B Stock $1 par value [Member]	Common Stock $1 par value [Member]	Class B Stock $1 par value [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Retained Earnings [Member] Common Stock $1 par value [Member]	Retained Earnings [Member] Class B Stock $1 par value [Member]	Accumulated Other Comprehensive Income (Loss) [Member]
Balance at Jun. 30, 2009	$ 609,383			$ 35,934	$ 9,133	$ 53,938	$ 542,006			$ (31,628)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	103,963						103,963
Other comprehensive income (loss), net of tax	3,623									3,623
Total comprehensive income	107,586
Share-based incentive plan transactions	9,573			536		9,037
Purchases of Company stock	(6,274)			(187)	(1)	(6,086)	0
Share-based compensation	(10,836)					(10,836)
Conversion of Class B to common stock				46	(46)
Dividends paid		(33,056)	(8,289)					(33,056)	(8,289)
Tax benefit from incentive plans	1,414					(1,414)
Balance at Jun. 30, 2010	688,345			36,329	9,086	66,311	604,624			(28,005)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	127,432						127,432
Other comprehensive income (loss), net of tax	11,842									11,842
Total comprehensive income	139,274
Share-based incentive plan transactions	8,676			410		8,266
Purchases of Company stock	(24,895)			(744)	(23)	(24,128)	0
Share-based compensation	8,940					(8,940)
Conversion of Class B to common stock	0			287	(287)
Dividends paid		(35,597)	(8,643)					(35,597)	(8,643)
Tax benefit from incentive plans	1,115					(1,115)
Balance at Jun. 30, 2011	774,985			36,282	8,776	58,274	687,816			(16,163)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	104,372						104,372
Other comprehensive income (loss), net of tax	(6,952)									(6,952)
Total comprehensive income	97,420
Share-based incentive plan transactions	5,908			425		5,483
Purchases of Company stock	(26,881)			(975)	(1)	(19,489)	(6,416)
Share-based compensation	(10,459)					(10,459)
Conversion of Class B to common stock	0			59	(59)
Dividends paid		(50,725)	(12,269)					(50,725)	(12,269)
Tax benefit from incentive plans	1,452					(1,452)
Balance at Jun. 30, 2012	$ 797,445			$ 35,791	$ 8,716	$ 53,275	$ 722,778			$ (23,115)