Condensed Consolidated Statement of Shareholders' Equity - 6 months ended Dec. 31, 2015 - 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, 2015	$ 951,850			$ 37,657	$ 6,963	$ 49,019	$ 870,859			$ (12,648)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	43,548						43,548
Other comprehensive loss, net of income taxes	(49)									(49)
Shares issued under incentive plans, net of forfeitures	6,455			182		6,273
Purchases of Company stock	(6,538)			(139)		(6,399)
Share-based compensation	8,804					8,804
Conversion of Class B to common stock	0			22	(22)
Dividends paid		$ (35,007)	$ (6,355)					$ (35,007)	$ (6,355)
Tax benefit from share-based awards	1,292					1,292
Ending balance at Dec. 31, 2015	$ 964,000			$ 37,722	$ 6,941	$ 58,989	$ 873,045			$ (12,697)