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Earnings Per Share - Additional Information (Detail) - shares
shares in Millions
3 Months Ended 6 Months Ended
Jan. 31, 2017
Jan. 31, 2016
Jan. 31, 2017
Jan. 31, 2016
Computation of Earnings Per Share [Line Items]        
Common stock equivalent shares excluded from the denominator in the calculation of diluted earnings per share 14.2 21.9 14.5 21.8