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Stock Repurchases (Details Textual) - shares | 6 Months Ended | 232 Months Ended |
--- | --- | --- | ---
Jan. 31, 2021 | Jan. 31, 2021 | Sep. 22, 2011
Number of stock options exercised | 889,000 |  |
Stock Repurchase Program 2011 |  |  |
Stock Repurchase Program Additional Number Of Shares Authorized Approved |  |  | 80,000,000
Stock Repurchased and Retired During Period, Shares |  | 114,549,198 |
Number of shares available for repurchase under stock repurchase program | 81,450,802 | 81,450,802 |
Common Stock | Stock Repurchase Program 2011 |  |  |
Common stock authorized for repurchase (in shares) |  |  | 196,000,000

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