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Stock-Based Benefit Plans (Details 3) (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended 6 Months Ended
Apr. 30, 2013
Apr. 30, 2012
Apr. 30, 2013
Apr. 30, 2012
Oct. 31, 2012
Stock Price-Based RSUs issued          
Stock based expense recognized $ 4,343 $ 3,205 $ 10,027 $ 8,831  
Stock Price Based Restricted Stock Units [Member]
         
Stock Price-Based RSUs issued          
Stock based expense recognized 416 679 979 1,528  
Aggregate outstanding RSUs 306,000   306,000   506,000
Unamortized value of RSUs $ 1,064   $ 1,064   $ 2,042