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Stock-Based Benefit Plans (Details 4) (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended 6 Months Ended 12 Months Ended
Apr. 30, 2014
Apr. 30, 2013
Apr. 30, 2014
Apr. 30, 2013
Oct. 31, 2013
Dec. 20, 2013
Dec. 17, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Stock based expense recognized $ 4,625 $ 4,343 $ 12,294 $ 10,027      
Non-Performance Based Restricted Stock Units [Member]
             
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Restricted stock units issued     99,336   94,080    
Closing Price of Company Common Stock at Issuance Date           $ 35.16 $ 32.22
Fair value of restricted stock units issued     3,493   3,031    
Stock based expense recognized 591 472 1,902 1,584      
Summary of aggregate number and unamortized value of outstanding stock price based RSUs              
Aggregate outstanding RSUs 307,606   307,606   225,252    
Unamortized value of RSUs $ 3,248   $ 3,248   $ 1,706