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, 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)
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 from incentive plans	277					277
Balance at Jun. 30, 2015	951,850			6,963	37,657	49,019	870,859			(12,648)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	33,937						33,937
Other comprehensive income (loss), net of tax	(15,853)									(15,853)
Stock issued under various incentive plans, net of forfeitures	20,879				587	20,292
Purchases of Company stock	(31,080)			(3)	(648)	(30,429)
Share-based compensation	12,757					12,757
Conversion of Class B to common stock	0			1,676	1,676
Dividends paid		(13,216)	(72,874)					(13,216)	(72,874)
Tax benefit from incentive plans	2,643					2,643
Balance at Jun. 30, 2016	889,043			5,284	39,272	54,282	818,706			(28,501)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	188,928						188,928
Other comprehensive income (loss), net of tax	9,492									9,492
Stock issued under various incentive plans, net of forfeitures	38,061				937	37,124
Purchases of Company stock	(53,399)			0	(941)	(52,458)
Share-based compensation	12,737					12,737
Conversion of Class B to common stock	0			165	165
Dividends paid		$ (10,512)	$ (81,419)					$ (10,512)	$ (81,419)
Tax benefit from incentive plans	3,041					3,041
Balance at Jun. 30, 2017	$ 995,972			$ 5,119	$ 39,433	$ 54,726	$ 915,703			$ (19,009)