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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
Apr. 30, 2015
Apr. 30, 2014
Earnings Per Share [Line Items]    
Basic weighted-average common shares outstanding 131,202,740us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 144,075,666us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Effect of dilutive options, stock appreciation rights, performance stock units and restricted stock units 1,633,404us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment 1,830,878us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment
Diluted weighted-average shares outstanding 132,836,144us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 145,906,544us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding