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Equity Incentive Plans - Restricted Stock (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended
Mar. 31, 2018
Oct. 31, 2018
Oct. 31, 2017
Oct. 31, 2018
Oct. 31, 2017
Jan. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock-based compensation expense   $ 58,329 $ 38,863 $ 155,938 $ 107,920  
Restricted Stock Units            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Converted (in shares) 1,375,210     1,142,838    
Issued (in shares)       11,098,371    
Compensation cost, weighted average term       3 years    
Number of Restricted Stock Outstanding            
Unvested, Beginning balance (in shares)       17,682,646    
Vested (in shares)       (6,429,146)    
Unvested, Ending balance (in shares)   19,489,304   19,489,304    
Weighted-Average Grant Date Fair Value            
Beginning balance (in dollars per share)       $ 12.60    
Vested (in dollars per share)       12.84    
Ending balance (in dollars per share)   $ 17.92   $ 17.92    
Aggregate Intrinsic Value   $ 393,270   $ 393,270   $ 356,117
Restricted Stock            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock-based compensation expense   7,500   17,700    
Unrecognized stock-based compensation expense   $ 26,300   $ 26,300    
Compensation cost, weighted average term       2 years 4 months 17 days    
Number of Restricted Stock Outstanding            
Unvested, Beginning balance (in shares)       0    
Granted and converted (in shares)       3,330,118    
Vested (in shares)       (116,186)    
Unvested, Ending balance (in shares)   3,213,932   3,213,932    
Weighted-Average Grant Date Fair Value            
Beginning balance (in dollars per share)       $ 0.00    
Granted and converted (in dollars per share)       19.25    
Vested (in dollars per share)       12.84    
Ending balance (in dollars per share)   $ 19.49   $ 19.49    
Aggregate Intrinsic Value   $ 64,857   $ 64,857   $ 0
Restricted Stock | Performance Vesting Conditions            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Converted (in shares) 697,116          
Restricted Stock | Service Vesting Conditions            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Converted (in shares) 678,094          
Restricted Stock | Performance Vesting at Maximum            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Issued (in shares)       1,954,908    
Restricted Stock | Maximum | Performance Vesting at Maximum            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Award vesting rights, percentage       180.00%    
Restricted Stock | Minimum | Performance Vesting at Maximum            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Award vesting rights, percentage       0.00%