Consolidated Statements of Shareholders' Equity (USD $) In Thousands	Total	Company Common Stock [Member]	Common Class B [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Company Common Stock [Member]	Company Common Stock [Member] Retained Earnings [Member]	Common Class B [Member]	Common Class B [Member] Retained Earnings [Member]
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	21,627				21,627
Other comprehensive income, net	228					228
Total comprehensive income	21,855
Share-based incentive plan transactions	1,182	251		931
Purchases of Company stock	(8,966)	(342)		(8,624)
Share-based compensation	4,023			4,023
Conversion of Class B to common stock	0	3	(3)
Dividends paid							(9,277)	(9,277)	(2,237)	(2,237)
Tax benefit from incentive plans	(1,476)			(1,476)
Balance at Sep. 30, 2011	$ 780,089	$ 36,194	$ 8,773	$ 53,128	$ 697,929	$ (15,935)