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Consolidated Statements of Stockholders' Equity (Parenthetical) (Retained Earnings, USD $)
12 Months Ended
Jul. 31, 2014
Jul. 31, 2013
Jul. 31, 2012
Retained Earnings
     
Special dividends, per common share $ 1.00 $ 1.50  
Cash dividends, per common share $ 0.92 $ 0.72 $ 0.60