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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, 2017
Apr. 30, 2016
Earnings Per Share [Line Items]    
Basic weighted-average common shares outstanding 116,276,289 117,304,736
Effect of dilutive options, stock appreciation rights, performance stock units and restricted stock units 263,016 282,273
Diluted weighted-average shares outstanding 116,539,305 117,587,009