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Stockholder's Equity (Details Textuals) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended | 82 Months Ended
--- | --- | --- | ---
Jan. 31, 2018 | Oct. 31, 2016 | Jul. 31, 2016 | Jul. 31, 2018 | Jul. 31, 2017 | Jul. 31, 2016 | Jul. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Payments Related to Tax Withholding for Share-based Compensation | $ 0 | $ 134,615 | $ 15,039 | $ 1,115 | $ 135,433 | $ 15,039 |
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 |  |  |  | 233,898,841 | 230,488,296 |  | 233,898,841
Common stock, reserved for issuance of stock options |  |  |  | 25,621,327 | 28,878,913 |  | 25,621,327
Common stock, shares issued |  |  |  | 233,898,841 | 230,488,296 |  | 233,898,841
Preferred stock, shares authorized |  |  |  | 5,000,000 | 5,000,000 |  | 5,000,000
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
Stock Repurchased and Retired During Period, Shares |  |  |  | 0 |  | 5,877,038 | 106,913,602
Adjustments Related to Tax Withholding for Share-based Compensation |  |  |  | $ 0 |  |  |
Employee Stock Purchase Plan (ESPP) |  |  |  |  |  |  |
Stockholders' Equity, Number of Shares, Par Value and Other Disclosures [Abstract] |  |  |  |  |  |  |
Common stock, reserved for issuance of stock options |  |  |  | 1,603,741 | 1,788,909 |  | 1,603,741
Settlement with Taxing Authority [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Payments Related to Tax Withholding for Share-based Compensation |  |  |  |  | $ 134,600 |  |

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