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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 9 Months Ended
Oct. 31, 2016
Oct. 31, 2015
Oct. 31, 2016
Oct. 31, 2015
Earnings Per Share [Line Items]        
Basic weighted-average common shares outstanding 116,829,912 123,442,931 117,087,696 127,478,092
Effect of dilutive options, stock appreciation rights, performance stock units and restricted stock units 563,798 282,650 365,309 1,028,863
Diluted weighted-average shares outstanding 117,393,710 123,725,581 117,453,005 128,506,955