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Reconciliation of Weighted Average Common Shares Outstanding Used for Computation of Basic and Diluted Net Income Per Common Share (Detail) - shares
3 Months Ended
Apr. 30, 2016
Apr. 30, 2015
Earnings Per Share [Line Items]    
Basic weighted-average common shares outstanding 117,304,736 131,202,740
Effect of dilutive options, stock appreciation rights, performance stock units and restricted stock units 282,273 1,633,404
Diluted weighted-average shares outstanding 117,587,009 132,836,144