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Earnings Per Share (Details 1) - shares
shares in Thousands
3 Months Ended 6 Months Ended
Jan. 31, 2017
Jan. 31, 2016
Jan. 31, 2017
Jan. 31, 2016
Stock options excluded from the diluted earnings per share computations        
Shares excluded from the calculation of diluted earnings per share 3 265 18 266