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Fair Value Hierarchy for Financial Assets and Liabilities Measured at Fair Value (Detail) (USD $)
In Thousands, unless otherwise specified
Jul. 31, 2012
Oct. 31, 2011
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Derivatives $ 3,104 $ 1,197
Derivatives 447 1,609
Level 1
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Deferred Compensation 834 741
Deferred Compensation      
Level 2
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Derivatives 3,104 1,197
Derivatives $ 447 $ 1,609