Consolidated Statements Of Stockholders' Equity And Comprehensive Income (USD $) In Thousands, except Share data	Treasury Stock [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Retained Earnings [Member]	Comprehensive Income [Member]	Total
Balance, value at Jul. 31, 2008	$ (73,684)	$ 5,732	$ 93,683	$ (1,963)	$ 675,928
Balance, shares at Jul. 31, 2008	1,877,339	57,317,263
Net income					17,143	17,143	17,143
Stock option activity, shares		1,000					1,000
Stock option activity, value			27
Cash dividends					(15,523)
Unrealized appreciation on investments, net of tax				3,118		3,118
Foreign currency translation adjustment, net of tax				(85)		(85)
Compensation expense			657
Balance, value at Jul. 31, 2009	(73,684)	5,732	94,367	1,070	677,548	20,176
Balance, shares at Jul. 31, 2009	1,877,339	57,318,263
Net income					110,064	110,064	110,064
Shares purchased, value	(115,420)
Shares purchased, shares	3,980,000
Stock option activity, shares		586					586
Stock option activity, value			16
Cash dividends					(42,408)
Unrealized appreciation on investments, net of tax				368		368
Foreign currency translation adjustment, net of tax				(1,762)		(1,762)
Compensation expense			1,387
Balance, value at Jul. 31, 2010	(189,104)	5,732	95,770	(324)	745,204	108,670
Balance, shares at Jul. 31, 2010	5,857,339	57,318,849
Net income					106,273	106,273	106,273
Stock option activity, shares		78,500					78,500
Stock option activity, value		8	1,549
Cash dividends					(22,329)
Unrealized appreciation on investments, net of tax				257		257
Heartland acquisition, value		430	90,101
Heartland acquisition, shares		4,300,000
Compensation expense			2,707
Balance, value at Jul. 31, 2011	$ (189,104)	$ 6,170	$ 190,127	$ (67)	$ 829,148	$ 106,530
Balance, shares at Jul. 31, 2011	5,857,339	61,697,349