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Stock-Based Benefit Plans (Details Textual) (USD $)
6 Months Ended 6 Months Ended
Apr. 30, 2013
Oct. 31, 2012
Apr. 30, 2013
Performance Based Restricted Stock Units [Member]
Apr. 30, 2012
Performance Based Restricted Stock Units [Member]
Apr. 30, 2013
Stock Price Based Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Gross shares awarded related to restricted stock         200,000
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period     4 years    
Stock Based Benefit Plans (Textual) [Abstract]          
Minimum percentage of units issued to the recipients of the base award 90.00%        
Maximum percentage of units issued to the recipients of the base award 110.00%        
Stock Based Benefit Plans (Additional Textual) [Abstract]          
Aggregate unamortized value of outstanding stock based compensation awards $ 28,200,000 $ 14,200,000      
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures     $ 10,937,000 $ 7,371,000