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STOCKHOLDERS’ EQUITY (Details) | Jul. 31, 2018 vote $ / shares shares | Jul. 31, 2017 $ / shares shares | Nov. 01, 2016 vote class | Oct. 31, 2016 class shares | Jul. 31, 2016 shares
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Class of Stock [Line Items] |  |  |  |  |
Preferred stock, shares authorized (in shares) | 200,000,000 | 200,000,000 |  |  |
Preferred stock, par value (in dollars per share) | $ / shares | $ 0.000025 | $ 0.000025 |  |  |
Preferred stock, shares issued (in shares) | 0 | 0 |  |  |
Common stock, number of classes of stock | class |  |  | 2 | 2 |
Common stock, shares authorized (in shares) | 1,200,000,000 | 1,200,000,000 |  |  |
Common stock, par value (in dollars per share) | $ / shares | $ 0.000025 | $ 0.000025 |  |  |
Common stock, shares issued (in shares) | 172,858,082 | 154,636,520 |  |  |
Common stock, shares outstanding (in shares) | 172,858,082 | 154,636,520 |  |  |
Options outstanding (in shares) | 11,332,554 | 20,334,531 |  |  | 26,166,968
Shares reserved for future issuance (in shares) | 47,815,755 |  |  |  |
2016 Plan |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Shares reserved for future issuance (in shares) | 46,133,294 |  |  |  |
RSUs |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
RSUs outstanding (in shares) | 23,597,499 | 17,376,090 |  |  | 12,265,369
Convertible preferred stock warrants | Common Class B Warrant |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Warrants or issued (in shares) | 34,180 |  |  |  |
Common Class A |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Common stock, shares authorized (in shares) | 1,000,000,000 | 1,000,000,000 |  |  |
Common stock, shares issued (in shares) | 135,109,672 | 93,570,171 |  |  |
Common stock, shares outstanding (in shares) | 135,109,672 | 93,570,171 |  |  |
Common stock number of votes per share | vote | 1 |  | 1 |  |
Common Class A | 2016 Plan |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Number of shares available for grant (in shares) | 11,169,061.000 |  |  |  |
Shares reserved for future issuance (in shares) |  |  |  | 22,400,000 |
Common Class B |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Common stock, shares authorized (in shares) | 200,000,000 | 200,000,000 |  |  |
Common stock, shares issued (in shares) | 37,748,410 | 61,066,349 |  |  |
Common stock, shares outstanding (in shares) | 37,748,410 | 61,066,349 |  |  |
Common stock number of votes per share | vote | 10 |  | 10 |  |
Employee stock purchase plan |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Shares reserved for future issuance (in shares) | 1,682,461.000 |  |  |  |

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