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Stock Repurchases (Details Textual) - USD ($) $ / shares in Units, $ in Millions | 6 Months Ended | 12 Months Ended | 100 Months Ended |
--- | --- | --- | --- | ---
Jan. 31, 2020 | Jul. 31, 2019 | Jan. 31, 2020 | Sep. 22, 2011
Stock Repurchased and Retired During Period, Shares |  | 7,635,596 |  |
Stock Repurchased and Retired During Period, Value |  | $ 365.0 |  |
Stock Repurchased and Retired During Period Cost Per Share |  | $ 47.81 |  |
Remittance to taxing authorities under statutory withholding | $ 101.3 |  |  |
Number of stock options exercised | 5,852,000 |  |  |
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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