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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 6 Months Ended
Jul. 31, 2015
Jul. 31, 2014
Jul. 31, 2015
Jul. 31, 2014
Earnings Per Share [Line Items]        
Basic weighted-average common shares outstanding 127,910,026 136,453,663 129,529,108 140,201,489
Effect of dilutive options, stock appreciation rights, performance stock units and restricted stock units 1,170,568 1,723,447 1,401,985 1,777,162
Diluted weighted-average shares outstanding 129,080,594 138,177,110 130,931,093 141,978,651