Condensed Consolidated Statement of Shareholders' Equity - 3 months ended Sep. 30, 2016 - USD ($) $ in Thousands	Total	Common Stock [Member]	Common Class B [Member]	Common Stock [Member] Common Stock [Member]	Common Stock [Member] Common Class B [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Retained Earnings [Member] Common Stock [Member]	Retained Earnings [Member] Common Class B [Member]	Accumulated Other Comprehensive Loss [Member]
Beginning balance at Jun. 30, 2016	$ 889,043			$ 39,272	$ 5,284	$ 54,282	$ 818,706			$ (28,501)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	33,973						33,973
Other comprehensive income, net of income taxes	2,006									2,006
Shares issued under incentive plans, net of forfeitures	13,019			317		12,702
Purchases of Company stock	(18,378)			(339)		(18,039)
Share-based compensation	6,358					6,358
Conversion of Class B to common stock	0			(26)	(26)
Dividends paid		$ (19,817)	$ (2,615)					$ (19,817)	$ (2,615)
Tax benefit from share-based awards	852					852
Ending balance at Sep. 30, 2016	$ 904,441			$ 39,276	$ 5,258	$ 56,155	$ 830,247			$ (26,495)