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Consolidated Statements of Stockholders' Equity (USD $)
In Thousands, except Share data
Total
Treasury Stock
Common Stock
Additional Paid-in Capital
Retained Earnings
Accumulated Other Comprehensive Income (Loss)
Beginning Balance at Jul. 31, 2011   $ (189,104) $ 6,170 $ 190,127 $ 829,148 $ (67)
Beginning Balance (in shares) at Jul. 31, 2011   5,857,339 61,697,349      
Net income 121,739       121,739  
Shares purchased (in shares)   3,000,000        
Shares purchased   (77,000)        
Stock option and restricted stock activity (in shares)     80,500      
Stock option and restricted stock activity     8 1,433    
Cash dividends - $.60 in 2012, $0.72 in 2013, $0.92 in 2014 per common share         (32,322)  
Unrealized appreciation on investments, net of tax 7         7
Stock compensation expense       688    
Ending Balance at Jul. 31, 2012   (266,104) 6,178 192,248 918,565 (60)
Ending Balance (in shares) at Jul. 31, 2012   8,857,339 61,777,849      
Net income 152,862       152,862  
Stock option and restricted stock activity (in shares)   941 203,951      
Stock option and restricted stock activity   (43) 21 5,783    
Special dividend - $1.50 in 2013, $ 1.00 in 2014 per common share         (79,525)  
Cash dividends - $.60 in 2012, $0.72 in 2013, $0.92 in 2014 per common share         (38,162)  
Cashless exercises of stock options (in shares)     63,464      
Cashless exercises of stock options     6 (2,009)    
Unrealized appreciation on investments, net of tax 38         38
Stock compensation expense       2,816    
Ending Balance at Jul. 31, 2013 892,614 (266,147) 6,205 198,838 953,740 (22)
Ending Balance (in shares) at Jul. 31, 2013   8,858,280 62,045,264      
Net income 179,002       179,002  
Stock option and restricted stock activity (in shares)   1,831 101,313      
Stock option and restricted stock activity   (101) 10 3,674    
Restricted stock unit activity (in shares)   20,766 63,852      
Restricted stock unit activity   (1,205) 6 758    
Special dividend - $1.50 in 2013, $ 1.00 in 2014 per common share         (53,290)  
Cash dividends - $.60 in 2012, $0.72 in 2013, $0.92 in 2014 per common share         (49,024)  
Unrealized appreciation on investments, net of tax 22         22
Stock compensation expense       5,231    
Ending Balance at Jul. 31, 2014 $ 977,697 $ (267,453) $ 6,221 $ 208,501 $ 1,030,428  
Ending Balance (in shares) at Jul. 31, 2014   8,880,877 62,210,429