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Stockholder's Equity (Details Textuals 1) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended | 118 Months Ended |
--- | --- | --- | ---
Jul. 31, 2021 | Jul. 31, 2019 | Jul. 31, 2021 | Sep. 22, 2011
Targeted or Tracking Stock, Stock [Line Items] |  |  |  |
Document Period End Date | Jul. 31, 2021 |  |  |
Stock Repurchase [Abstract] |  |  |  |
Stock repurchase price per share (in dollars per share) |  | $ 47.81 |  |
Company repurchased common stock |  | $ 365.0 |  |
Stock Repurchase Program 2011 [Member] |  |  |  |
Stock Repurchase [Abstract] |  |  |  |
Additional common stock authorized for repurchase (in shares) |  |  |  | 80,000,000
Common stock authorized for repurchase (in shares) |  |  |  | 196,000,000
Company repurchased common stock (in shares) |  | 7,635,596 | 114,549,198 |
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased | 81,450,802 |  | 81,450,802 |

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