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Stockholder's Equity (Details Textuals 1) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended | 68 Months Ended |
--- | --- | --- | --- | ---
Oct. 31, 2019 | Apr. 30, 2019 | Jan. 31, 2018 | Jul. 31, 2020 | Jul. 31, 2019 | Jul. 31, 2018 | Jul. 31, 2020 | Sep. 22, 2011
Targeted or Tracking Stock, Stock [Line Items] |  |  |  |  |  |  |  |
Document Period End Date |  |  |  | Jul. 31, 2020 |  |  |  |
Stock Repurchase [Abstract] |  |  |  |  |  |  |  |
Stock repurchase price per share (in dollars per share) |  |  |  |  | $ 47.81 |  |  |
Company repurchased common stock |  |  |  |  | $ 365,000 |  |  |
Payments for Employee Stock-Based Tax Withholdings | $ 101,348 | $ 45,565 | $ 0 | $ 103,451 | $ 46,888 | $ 1,115 |  |
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 |
Settlement with Taxing Authority [Member] |  |  |  |  |  |  |  |
Stock Repurchase [Abstract] |  |  |  |  |  |  |  |
Payments for Employee Stock-Based Tax Withholdings |  |  |  | $ 101,300 | $ 45,600 | $ 0 |  |

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- Definition The end date of the period reflected on the cover page if a periodic report. For all other reports and registration statements containing historical data, it is the date up through which that historical data is presented. If there is no historical data in the report, use the filing date. The format of the date is YYYY-MM-DD. + References No definition available. + Details
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