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Stockholder's Equity (Details Textuals 1) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended | 94 Months Ended |
--- | --- | --- | --- | ---
Apr. 30, 2019 | Jan. 31, 2019 | Oct. 31, 2017 | Jul. 31, 2019 | Jul. 31, 2018 | Jul. 31, 2017 | Jul. 31, 2019 | Sep. 22, 2011
Targeted or Tracking Stock, Stock [Line Items] |  |  |  |  |  |  |  |
Document Period End Date |  |  |  | Jul. 31, 2019 |  |  |  |
Stock Repurchase [Abstract] |  |  |  |  |  |  |  |
Stock repurchase price per share (in dollars per share) |  |  |  | $ 47.81 |  |  | $ 47.81 |
Company repurchased common stock |  |  |  | $ 365,000 |  |  |  |
Payments for Employee Stock-Based Tax Withholdings | $ 45,565 | $ 0 | $ 134,615 | $ 46,888 | $ 1,115 | $ 135,433 |  |
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 |  |  |  | $ 45,600 | $ 0 | $ 134,600 |  |

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