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Stock-Based Benefit Plans (Details Textual) (USD $)
In Millions, except Share data, unless otherwise specified
3 Months Ended 6 Months Ended
Apr. 30, 2012
Apr. 30, 2012
Oct. 31, 2011
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]      
Shares issued under stock-based benefit plans 660,967 1,601,295  
Aggregate unamortized value of outstanding stock based compensation awards $ 20.3 $ 20.3 $ 12.7
Performance Based Restricted Stock Units [Member]
     
Stock Based Benefit Plans (Textual) [Abstract]      
RSU vesting period   over a four-year period  
Non-Performance Based Restricted Stock Units [Member]
     
Stock Based Benefit Plans (Textual) [Abstract]      
RSU vesting period   over a four-year period  
Stock Price Based Restricted Stock Units [Member]
     
Stock Based Benefit Plans (Textual) [Abstract]      
Number of consecutive trading days   20 days  
Average closing price of company common stock   measured over any 20 consecutive trading days ending on or prior to five years from date of issuance  
Period of issuance of stock price based RSU   5 years  
Stock Based Benefit Plans (Additional Textual) [Abstract]      
Percentage increases over closing price   30.00%