STOCKHOLDERS’ EQUITY (Details) |
Jan. 31, 2017
vote
class
$ / shares
shares
|
Sep. 30, 2016
vote
class
|
|---|---|---|
| Class of Stock [Line Items] | ||
| Preferred stock, shares authorized (in shares) | 200,000,000 | |
| Preferred stock, par value (in dollars per share) | $ / shares | $ 0.000025 | |
| Preferred stock, shares issued (in shares) | 0 | |
| Preferred stock, shares outstanding (in shares) | 0 | |
| Common stock, number of classes of stock | class | 2 | 2 |
| Common stock, par value (in dollars per share) | $ / shares | $ 0.000025 | |
| Common Class A | ||
| Class of Stock [Line Items] | ||
| Common stock, shares authorized (in shares) | 1,000,000,000 | |
| Common stock, shares issued (in shares) | 33,500,377 | |
| Common stock number of votes per share | vote | 1 | 1 |
| Common Class B | ||
| Class of Stock [Line Items] | ||
| Common stock, shares authorized (in shares) | 200,000,000 | |
| Common stock, shares issued (in shares) | 109,713,179 | |
| Common stock number of votes per share | vote | 10 | 10 |