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CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY Statement - USD ($)
$ in Thousands
Total
Common Stock
Additional Paid-In Capital
Accumulated Other Comprehensive Loss
Accumulated Deficit
Stockholders' equity, beginning balance (in shares) at Jul. 31, 2018   172,858,000      
Stockholders' equity, beginning balance at Jul. 31, 2018 $ 326,779 $ 4 $ 1,355,907 $ (1,002) $ (1,028,130)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Issuance of common stock through employee equity incentive plans, net of repurchases (in shares)   2,629,000      
Issuance of common stock through employee equity incentive plans 3,680   3,680    
Issuance of common stock from ESPP purchase (in shares)   1,128,000      
Issuance of common stock from ESPP purchase 26,318   26,318    
Issuance of common stock in connection with an acquisition (in shares)   2,451,000      
Issuance of common stock in connection with an acquisition 102,978   102,978    
Stock-based compensation 65,925   65,925    
Vesting of early exercised stock options 70   70    
Other comprehensive income (loss) (166)     (166)  
Net loss (94,265)       (94,265)
Stockholders' equity, ending balance (in shares) at Oct. 31, 2018   179,066,000      
Stockholders' equity, ending balance at Oct. 31, 2018 431,319 $ 4 1,554,878 (1,168) (1,122,395)
Stockholders' equity, beginning balance (in shares) at Jul. 31, 2018   172,858,000      
Stockholders' equity, beginning balance at Jul. 31, 2018 326,779 $ 4 1,355,907 (1,002) (1,028,130)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net loss (426,841)        
Stockholders' equity, ending balance (in shares) at Apr. 30, 2019   185,900,000      
Stockholders' equity, ending balance at Apr. 30, 2019 305,446 $ 5 1,760,083 329 (1,454,971)
Stockholders' equity, beginning balance (in shares) at Oct. 31, 2018   179,066,000      
Stockholders' equity, beginning balance at Oct. 31, 2018 431,319 $ 4 1,554,878 (1,168) (1,122,395)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Issuance of common stock through employee equity incentive plans, net of repurchases (in shares)   2,968,000      
Issuance of common stock through employee equity incentive plans 3,341   3,341    
Stock-based compensation 72,565   72,565    
Vesting of early exercised stock options 50   50    
Other comprehensive income (loss) 1,019     1,019  
Net loss (122,763)       (122,763)
Stockholders' equity, ending balance (in shares) at Jan. 31, 2019   182,034,000      
Stockholders' equity, ending balance at Jan. 31, 2019 385,531 $ 4 1,630,834 (149) (1,245,158)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Issuance of common stock through employee equity incentive plans, net of repurchases (in shares)   2,980,000      
Issuance of common stock through employee equity incentive plans 3,154   3,154    
Issuance of common stock from ESPP purchase (in shares)   880,000      
Issuance of common stock from ESPP purchase 30,900 $ 1 30,899    
Issuance of common stock in connection with an acquisition (in shares)   6,000      
Issuance of common stock in connection with an acquisition 327   327    
Stock-based compensation 94,832   94,832    
Vesting of early exercised stock options 37   37    
Other comprehensive income (loss) 478     478  
Net loss (209,813)       (209,813)
Stockholders' equity, ending balance (in shares) at Apr. 30, 2019   185,900,000      
Stockholders' equity, ending balance at Apr. 30, 2019 $ 305,446 $ 5 1,760,083 329 (1,454,971)
Stockholders' equity, beginning balance (in shares) at Jul. 31, 2019 188,595,000 188,595,000      
Stockholders' equity, beginning balance at Jul. 31, 2019 $ 186,893 $ 5 1,835,528 669 (1,649,309)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Issuance of common stock through employee equity incentive plans, net of repurchases (in shares)   2,620,000      
Issuance of common stock through employee equity incentive plans 2,608   2,608    
Issuance of common stock from ESPP purchase (in shares)   959,000      
Issuance of common stock from ESPP purchase 21,337   21,337    
Stock-based compensation 81,426   81,426    
Other comprehensive income (loss) 565     565  
Net loss (229,300)       (229,300)
Stockholders' equity, ending balance (in shares) at Oct. 31, 2019   192,174,000      
Stockholders' equity, ending balance at Oct. 31, 2019 $ 63,529 $ 5 1,940,899 1,234 (1,878,609)
Stockholders' equity, beginning balance (in shares) at Jul. 31, 2019 188,595,000 188,595,000      
Stockholders' equity, beginning balance at Jul. 31, 2019 $ 186,893 $ 5 1,835,528 669 (1,649,309)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net loss $ (687,535)        
Stockholders' equity, ending balance (in shares) at Apr. 30, 2020 199,526,000 199,526,000      
Stockholders' equity, ending balance at Apr. 30, 2020 $ (184,039) $ 5 2,151,175 1,625 (2,336,844)
Stockholders' equity, beginning balance (in shares) at Oct. 31, 2019   192,174,000      
Stockholders' equity, beginning balance at Oct. 31, 2019 63,529 $ 5 1,940,899 1,234 (1,878,609)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Issuance of common stock through employee equity incentive plans, net of repurchases (in shares)   2,480,000      
Issuance of common stock through employee equity incentive plans 2,414   2,414    
Stock-based compensation 85,615   85,615    
Other comprehensive income (loss) (96)     (96)  
Net loss (217,564)       (217,564)
Stockholders' equity, ending balance (in shares) at Jan. 31, 2020   194,654,000      
Stockholders' equity, ending balance at Jan. 31, 2020 (66,102) $ 5 2,028,928 1,138 (2,096,173)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Issuance of common stock through employee equity incentive plans, net of repurchases (in shares)   2,512,000      
Issuance of common stock through employee equity incentive plans 858   858    
Issuance of common stock from ESPP purchase (in shares)   2,360,000      
Issuance of common stock from ESPP purchase 29,293   29,293    
Stock-based compensation 92,096   92,096    
Other comprehensive income (loss) 487     487  
Net loss $ (240,671)       (240,671)
Stockholders' equity, ending balance (in shares) at Apr. 30, 2020 199,526,000 199,526,000      
Stockholders' equity, ending balance at Apr. 30, 2020 $ (184,039) $ 5 $ 2,151,175 $ 1,625 $ (2,336,844)