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Common Stock Repurchases (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jul. 31, 2015 | Apr. 30, 2015 | Jan. 31, 2015 | Jan. 31, 2016
Share-Based Compensation Arrangement By Share-Based Payment Award, Options Exercisable [Abstract] |  |  |  |
Options Exercised |  |  |  | 100,000
Weighted Average Exercise Price |  |  |  | $ 17.42
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(1) | 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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- Definition Amount of Tax Expenses Paid by Company releated to the Share-based Compensation to the taxing authority. + References No definition available. + Details
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