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Stockholder's Equity (Details Textuals) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended | 118 Months Ended
--- | --- | ---
Jul. 31, 2021 | Jul. 31, 2020 | Jul. 31, 2019 | Jul. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Payments for Employee Stock-Based Tax Withholdings | $ 6,145 | $ 103,451 | $ 46,888 |
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 | 237,014,273 | 235,315,337 |  | 237,014,273
Common stock, reserved for issuance of stock options | 15,326,030 | 12,977,173 |  | 15,326,030
Common stock, shares issued | 237,014,273 | 235,315,337 |  | 237,014,273
Preferred Stock, Shares Authorized | 5,000,000 | 5,000,000 |  | 5,000,000
Preferred Stock, Shares Outstanding | 0 | 0 |  | 0
Preferred Stock, Shares Issued | 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 | 1,194,213 | 1,303,592 |  | 1,194,213
Stock Repurchase Program 2011 [Member] |  |  |  |
Stockholders' Equity, Number of Shares, Par Value and Other Disclosures [Abstract] |  |  |  |
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased | 81,450,802 |  |  | 81,450,802
Stock Repurchased and Retired During Period, Shares |  |  | 7,635,596 | 114,549,198
Settlement with Taxing Authority [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Payments for Employee Stock-Based Tax Withholdings | $ 3,800 | $ 101,300 | $ 45,600 |

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