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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 6 Months Ended
Jul. 31, 2014
Jul. 31, 2013
Jul. 31, 2014
Jul. 31, 2013
Earnings Per Share [Line Items]        
Basic weighted-average common shares outstanding 136,453,663 147,038,073 140,201,489 146,670,110
Effect of dilutive stock options, stock appreciation rights, performance stock units and restricted stock units 1,723,447 2,323,059 1,777,162 2,416,182
Diluted weighted-average common shares outstanding 138,177,110 149,361,132 141,978,651 149,086,292