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Condensed Consolidated Statements of Stockholders' Equity Condensed Consolidated Statements of Stockholders' Equity - USD ($)
$ in Thousands
Total
Common Stock
Additional Paid-In Capital
Accumulated Other Comprehensive Income (Loss)
Accumulated Deficit
Balance, shares at Jan. 31, 2018   211,977,495      
Balance at Jan. 31, 2018 $ 1,580,365 $ 211 $ 3,354,423 $ (46,413) $ (1,727,856)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Issuance of common stock under employee equity plans (in shares)   516,354      
Issuance of common stock under employee equity plans 2,612 $ 1 2,611    
Vested restricted stock units (in shares)   2,639,972      
Vested restricted stock units 0 $ 3      
Vested restricted stock units     (3)    
Share-based compensation 132,659   132,659    
Other comprehensive income (loss) 15,647     15,647  
Net loss (74,410)       (74,410)
Balance, shares at Apr. 30, 2018   215,133,821      
Balance at Apr. 30, 2018 1,657,300 $ 215 3,489,690 (30,766) (1,801,839)
Balance, shares at Jan. 31, 2019   222,052,063      
Balance at Jan. 31, 2019 1,958,442 $ 221 4,105,334 (809) (2,146,304)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Issuance of common stock under employee equity plans (in shares)   718,832      
Issuance of common stock under employee equity plans 3,455 $ 1 3,454    
Vested restricted stock units (in shares)   2,666,099      
Vested restricted stock units 0 $ 3      
Vested restricted stock units     (3)    
Share-based compensation 185,204   185,204    
Other comprehensive income (loss) 13,922     13,922  
Net loss (116,275)       (116,275)
Balance, shares at Apr. 30, 2019   225,436,994      
Balance at Apr. 30, 2019 $ 2,044,748 $ 225 $ 4,294,370 $ 13,113 $ (2,262,960)