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Common Stock Repurchases (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended
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Oct. 31, 2015 | Jul. 31, 2015 | Apr. 30, 2015 | Oct. 31, 2014
Share-Based Compensation Arrangement By Share-Based Payment Award, Options Exercisable [Abstract] |  |  |  |
Options Exercised | 31,000 |  |  |
Weighted Average Exercise Price | $ 12.02 |  |  |
Common Stock [Member] |  |  |  |
Share-Based Compensation Arrangement By Share-Based Payment Award, Options Exercisable [Abstract] |  |  |  |
Options Exercised |  | 200,000 | 139,690 | 201,333
Weighted Average Exercise Price |  | $ 12.02 | $ 20.27 | $ 19.59
Shares Net Settled for Exercise |  | 66,602 | 76,021 | 124,621
Shares Withheld for Taxes |  | 52,158 | 20,656 | 35,416
Net Shares to Employees |  | 81,240 | 43,013 | 41,296
Weighted Average Share Price for Withholding |  | $ 36.08 | $ 37.27 | $ 31.65
Tax Withholdings (in 000s) |  | $ 1,882 | $ 770 | $ 1,121

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- Definition Represents the number of net impact on number of shares settled resulting from exercise. + References No definition available. + Details
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