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Stock Repurchases (Details Textual) - USD ($) $ in Millions | 3 Months Ended | 79 Months Ended |
--- | --- | --- | ---
Oct. 31, 2018 | Apr. 30, 2018 | Sep. 22, 2011
Remittance to taxing authorities under statutory withholding | $ 0.0 |  |
Number of stock options exercised | 62,000 |  |
Stock Repurchase Program 2011 |  |  |
Stock Repurchase Program Additional Number Of Shares Authorized Approved |  |  | 80,000,000
Stock Repurchased and Retired During Period, Shares |  | 106,913,602 |
Number of shares available for repurchase under stock repurchase program | 89,086,398 |  |
Common Stock | Stock Repurchase Program 2011 |  |  |
Common stock authorized for repurchase (in shares) |  |  | 196,000,000

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