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Schedule of Share Based Awards granted and Weighted Average Fair Value (Detail) (USD $)
3 Months Ended
Apr. 30, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Awards Granted 103,500
Stock Appreciation Rights (SARs)
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Awards Granted 27,500
Weighted Average Fair Value 14.11
Performance Share Units
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Awards Granted 66,000
Weighted Average Fair Value 24.38
Restricted Stock
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Awards Granted 10,000
Weighted Average Fair Value 39.06