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Fair Values and Balance Sheet Presentation of Derivative Instruments (Detail) (USD $)
In Thousands, unless otherwise specified
Oct. 31, 2011
Jan. 31, 2011
Asset Derivatives    
Asset derivatives   $ 1,700
Liability Derivatives    
Liability derivatives   (874)
Derivatives not designated as hedging instruments
   
Liability Derivatives    
Liability derivatives (527) (460)
Derivatives not designated as hedging instruments | Other receivables
   
Asset Derivatives    
Asset derivatives 2,038 1,125
Derivatives designated as hedging instruments | Cash flow forwards
   
Liability Derivatives    
Liability derivatives   (414)
Derivatives designated as hedging instruments | Cash flow forwards | Other receivables
   
Asset Derivatives    
Asset derivatives   $ 575