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Reconciliation of Weighted Average Common Shares Outstanding Used for Computation of Basic and Diluted Net Income Per Common Share (Detail)
3 Months Ended 9 Months Ended
Oct. 31, 2014
Oct. 31, 2013
Oct. 31, 2014
Oct. 31, 2013
Earnings Per Share [Line Items]        
Basic weighted-average common shares outstanding 134,267,259 147,405,769 138,201,670 146,918,029
Effect of dilutive stock options, stock appreciation rights, performance stock units and restricted stock units 1,681,195 2,111,377 1,745,173 2,314,580
Diluted weighted-average common shares outstanding 135,948,454 149,517,146 139,946,843 149,232,609