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Stockholder's Equity (Details Textuals) - 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
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Payments for Employee Stock-Based Tax Withholdings | $ 45,565 | $ 0 | $ 134,615 | $ 46,888 | $ 1,115 | $ 135,433 |
Stockholders' Equity, Number of Shares, Par Value and Other Disclosures [Abstract] |  |  |  |  |  |  |
Common stock, shares authorized |  |  |  | 400,000,000 | 400,000,000 |  | 400,000,000
Common stock par value (in dollars per share) |  |  |  | $ 0.0001 | $ 0.0001 |  | $ 0.0001
Common stock, shares outstanding |  |  |  | 229,790,268 | 233,898,841 |  | 229,790,268
Common stock, reserved for issuance of stock options |  |  |  | 20,502,335 | 25,621,327 |  | 20,502,335
Common stock, shares issued |  |  |  | 229,790,268 | 233,898,841 |  | 229,790,268
Preferred stock, shares authorized |  |  |  | 5,000,000,000,000 | 5,000,000 |  | 5,000,000,000,000
Preferred stock par value (in dollars per share) |  |  |  | $ 0.0001 | $ 0.0001 |  | $ 0.0001
Preferred stock, shares issued |  |  |  | 0 | 0 |  | 0
Preferred stock, shares outstanding |  |  |  | 0 | 0 |  | 0
Employee Stock Purchase Plan |  |  |  |  |  |  |
Stockholders' Equity, Number of Shares, Par Value and Other Disclosures [Abstract] |  |  |  |  |  |  |
Common stock, reserved for issuance of stock options |  |  |  | 1,426,698 | 1,603,741 |  | 1,426,698
Stock Repurchase Program 2011 [Member] |  |  |  |  |  |  |
Stockholders' Equity, Number of Shares, Par Value and Other Disclosures [Abstract] |  |  |  |  |  |  |
Stock Repurchased and Retired During Period, 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] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Payments for Employee Stock-Based Tax Withholdings |  |  |  | $ 45,600 | $ 0 | $ 134,600 |

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