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STOCKHOLDERS’ EQUITY (Details)
Oct. 31, 2017
vote
$ / shares
shares
Jul. 31, 2017
$ / shares
shares
Sep. 30, 2016
class
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  
Preferred stock, shares outstanding (in shares) 0 0  
Common stock, number of classes of stock | class     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) 159,887,325 154,636,520  
Common stock, shares outstanding (in shares) 159,887,325 154,636,520  
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) 108,173,525 93,570,171  
Common stock, shares outstanding (in shares) 108,173,525 93,570,171  
Common stock number of votes per share | vote 1    
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) 51,713,800 61,066,349  
Common stock, shares outstanding (in shares) 51,713,800 61,066,349  
Common stock number of votes per share | vote 10