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Stockholders' Equity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended
Jul. 31, 2015
Apr. 30, 2015
Oct. 31, 2014
Oct. 31, 2013
Jan. 31, 2013
Share-Based Compensation Arrangement By Share-Based Payment Award, Options Exercisable [Abstract]          
Options Exercised 200,000 139,690 201,333 14,000 73,228
Exercise Price $ 12.02 $ 20.27 $ 19.59 $ 16.43 $ 8.89
Shares Net Settled for Exercise 66,602 76,021 124,621 7,241 18,127
Shares Withheld for Taxes 52,158 20,656 35,416 2,519 17,461
Net Shares to Employee 81,240 43,013 41,296 4,240 37,640
Share Price for Withholding $ 36.08 $ 37.27 $ 31.65 $ 31.77 $ 35.91
Tax Withholding (in 000's) $ 1,882 $ 770 $ 1,121 $ 80 $ 627