Condensed Consolidated Statement of Shareholders' Equity (USD $) In Thousands, unless otherwise specified	Total	Common Stock [Member]	Common Class B [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]
Balance at Jun. 30, 2014	$ 891,652			$ 36,776	$ 7,700	$ 41,884	$ 814,050			$ (8,758)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	94,212						94,212
Other comprehensive loss, net of income taxes	(2,126)									(2,126)
Share-based incentive plan transactions	35,472			946		34,526
Purchases of Company stock	(41,957)			(833)	(1)	(41,123)
Share-based compensation	10,907					10,907
Conversion of Class B to common stock	0			674	(674)
Dividends paid		(49,871)	(9,519)					(49,871)	(9,519)
Tax benefit from share-based awards	967					967
Balance at Mar. 31, 2015	$ 929,737			$ 37,563	$ 7,025	$ 47,161	$ 848,872			$ (10,884)