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Stock Compensation Plans - Additional Information (Detail) (USD $)
9 Months Ended
Jul. 31, 2011
Jul. 31, 2010
Nov. 02, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total stock based compensation expense $ 4,079,000 $ 6,506,000  
Employee Stock Purchase Plan
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Compensation cost 148,000 211,000  
Employee Stock Purchase Plan | Restricted Stock
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares purchased by participants 17,353    
Average price per share purchased by participants $ 43.13    
Matching shares issued 4,265    
Performance Based Awards
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Target number of common stock to be granted     86,725
Aggregate target number of shares outstanding 204,691    
Compensation cost 1,046,000 3,076,000  
Unvested Restricted Stock Grants
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Compensation cost $ 2,884,000 $ 3,219,000  
Unvested Restricted Stock Grants | Restricted Stock
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Aggregate number of shares outstanding related to all unvested restricted stock grants 567,188    
Unvested Restricted Stock Grants | Restricted Stock | Officers and Key Management Employees
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares of restricted stock granted 86,725    
Grant date fair value of restricted shares $ 43.70    
Vesting date of the restricted stock granted Nov. 01, 2014    
Unvested Restricted Stock Grants | Restricted Stock | Outside Directors
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares of restricted stock granted 25,300    
Grant date fair value of restricted shares $ 43.70    
Vesting period of the restricted stock granted from date of grant one, two or three years