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Common Stock Repurchases (Details Textual) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Oct. 31, 2015 | Jan. 31, 2015 | Oct. 31, 2014 | Sep. 22, 2011
Remittance to taxing authorities under statutory withholding |  |  | $ 1.1 |
Number of stock options exercised | 31,000 |  |  |
Stock Repurchase Program 2011 [Member] |  |  |  |
Additional common stock authorized for repurchase (in shares) |  |  |  | 40,000,000
Common stock authorized for repurchase (in shares) |  |  |  | 98,000,000
Number of shares repurchased under the program | 50,518,282 |  |  |
Number of shares available for repurchase under stock repurchase program | 47,481,718 |  |  |
Executive Officers and Certain Employees [Member] |  |  |  |
Number of stock options exercised | 0 | 0 |  |

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