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Reconciliation of Weighted Average Shares Outstanding Used for Computation of Basic and Diluted Net Income Per Common Share (Detail)
3 Months Ended
Apr. 30, 2013
Apr. 30, 2012
Earnings Per Share [Line Items]    
Basic weighted-average common shares outstanding 146,289,751 144,709,199
Effect of dilutive options, stock appreciation rights, performance stock units and restricted stock units 2,509,305 859,468
Diluted weighted-average common shares outstanding 148,799,056 145,568,667