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Condensed Consolidated Statements of Stockholders' Equity - USD ($)
shares in Thousands, $ in Thousands
Total
Common Stock
Additional Paid-In Capital
Treasury Stock
Accumulated Other Comprehensive Income (Loss)
Accumulated Deficit
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Cumulative-effect adjustment to Accumulated deficit related to the adoption of ASU | Accounting Standards Update 2016-16           $ 427
Cumulative-effect adjustment to Accumulated deficit related to the adoption of ASU | Accounting Standards Update 2018-07     $ 0     0
Balance, shares at Jan. 31, 2018   211        
Balance at Jan. 31, 2018     3,354,423 $ 0 $ (46,413) (1,727,856)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Issuance of common stock under employee equity plans (in shares)   2        
Issuance of common stock under employee equity plans     41,297      
Vested restricted stock units (in shares)   4        
Vested restricted stock units     (4)      
Share-based compensation     279,722      
Exercise of convertible senior notes hedges     193,679 (193,679)    
Settlement of convertible senior notes (in shares)   1        
Settlement of convertible senior notes     (6)      
Other comprehensive income (loss) $ 33,982       33,982  
Net loss (160,566)         (160,566)
Balance, shares at Jul. 31, 2018   218        
Balance at Jul. 31, 2018 1,775,224   3,869,111 (193,679) (12,431) (1,887,995)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Cumulative-effect adjustment to Accumulated deficit related to the adoption of ASU | Accounting Standards Update 2016-16           0
Cumulative-effect adjustment to Accumulated deficit related to the adoption of ASU | Accounting Standards Update 2018-07     0     0
Balance, shares at Apr. 30, 2018   215        
Balance at Apr. 30, 2018     3,489,690 0 (30,766) (1,801,839)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Issuance of common stock under employee equity plans (in shares)   1        
Issuance of common stock under employee equity plans     38,686      
Vested restricted stock units (in shares)   1        
Vested restricted stock units     (1)      
Share-based compensation     147,063      
Exercise of convertible senior notes hedges     193,679 (193,679)    
Settlement of convertible senior notes (in shares)   1        
Settlement of convertible senior notes     (6)      
Other comprehensive income (loss) 18,335       18,335  
Net loss (86,156)         (86,156)
Balance, shares at Jul. 31, 2018   218        
Balance at Jul. 31, 2018 1,775,224   3,869,111 (193,679) (12,431) (1,887,995)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Cumulative-effect adjustment to Accumulated deficit related to the adoption of ASU | Accounting Standards Update 2016-16           0
Cumulative-effect adjustment to Accumulated deficit related to the adoption of ASU | Accounting Standards Update 2018-07     381     (381)
Balance, shares at Jan. 31, 2019   221        
Balance at Jan. 31, 2019 1,958,442   4,105,334 0 (809) (2,146,304)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Issuance of common stock under employee equity plans (in shares)   2        
Issuance of common stock under employee equity plans     61,538      
Vested restricted stock units (in shares)   4        
Vested restricted stock units     (4)      
Share-based compensation     394,023      
Exercise of convertible senior notes hedges     0 0    
Settlement of convertible senior notes (in shares)   0        
Settlement of convertible senior notes     0      
Other comprehensive income (loss) 33,267       33,267  
Net loss (236,987)         (236,987)
Balance, shares at Jul. 31, 2019   227        
Balance at Jul. 31, 2019 2,210,285   4,561,272 0 32,458 (2,383,672)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Cumulative-effect adjustment to Accumulated deficit related to the adoption of ASU | Accounting Standards Update 2016-16           0
Cumulative-effect adjustment to Accumulated deficit related to the adoption of ASU | Accounting Standards Update 2018-07     0     0
Balance, shares at Apr. 30, 2019   225        
Balance at Apr. 30, 2019     4,294,370 0 13,113 (2,262,960)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Issuance of common stock under employee equity plans (in shares)   1        
Issuance of common stock under employee equity plans     58,084      
Vested restricted stock units (in shares)   1        
Vested restricted stock units     (1)      
Share-based compensation     208,819      
Exercise of convertible senior notes hedges     0 0    
Settlement of convertible senior notes (in shares)   0        
Settlement of convertible senior notes     0      
Other comprehensive income (loss) 19,345       19,345  
Net loss (120,712)         (120,712)
Balance, shares at Jul. 31, 2019   227        
Balance at Jul. 31, 2019 $ 2,210,285   $ 4,561,272 $ 0 $ 32,458 $ (2,383,672)