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Stock Repurchase Activities (Parenthetical) (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
12 Months Ended 3 Months Ended
Oct. 31, 2011
Jan. 31, 2012
Foreign Currency Derivative Contracts
Share Repurchases [Line Items]    
Settlement of equity forward contract $ 33,335  
Common stock issued for settlement of equity forward contract   1,105,457