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Consolidated Statements of Stockholders' Equity (Parenthetical) - Retained Earnings - $ / shares
12 Months Ended
Jul. 31, 2016
Jul. 31, 2015
Jul. 31, 2014
Special dividends, per common share     $ 1.00
Cash dividends, per common share $ 1.20 $ 1.08 $ 0.92