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Equity Incentive Plans - Restricted Stock Units (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended
Mar. 31, 2018
Aug. 31, 2017
Mar. 30, 2017
Jul. 31, 2018
Jul. 31, 2017
Jul. 31, 2018
Jul. 31, 2017
Jan. 31, 2018
Weighted-Average Grant Date Fair Value                
Compensation cost, weighted average term           2 years 1 month 6 days    
Stock-based compensation expense       $ 53,654 $ 36,838 $ 97,609 $ 69,057  
Restricted Stock Units                
Number of Restricted Stock Units Outstanding                
Unvested, Beginning balance (in shares)           17,682,646    
Granted (in shares)           7,751,921    
Vested (in shares)           (4,117,282)    
Forfeited (in shares)           (858,561)    
Converted (in shares)           (1,142,838)    
Unvested, Ending balance (in shares) 1,375,210     19,315,886   19,315,886    
Weighted-Average Grant Date Fair Value                
Beginning balance (in dollars per share)           $ 12.60    
Granted (in dollars per share)           20.79    
Vested (in dollars per share)           12.50    
Forfeited (in dollars per share)           14.18    
Converted (in dollars per share)           11.86    
Ending balance (in dollars per share)       $ 15.87   $ 15.87    
Aggregate Intrinsic Value       $ 418,359   $ 418,359   $ 356,117
Compensation not yet recognized       273,300   $ 273,300    
Compensation cost, weighted average term           3 years    
Performance Shares | Granted March 2017                
Number of Restricted Stock Units Outstanding                
Granted (in shares)     750,000          
Forfeited (in shares)     (77,000)          
Weighted-Average Grant Date Fair Value                
Earned (in shares) 780,000              
Stock-based compensation expense       $ 500 $ 1,200 $ 1,500 $ 1,600  
Performance Shares | Granted March 2017 | Minimum                
Weighted-Average Grant Date Fair Value                
Award vesting rights, percentage     0.00%          
Performance Shares | Granted March 2017 | Maximum                
Weighted-Average Grant Date Fair Value                
Award vesting rights, percentage     150.00%          
Performance Shares | Granted August 2017                
Number of Restricted Stock Units Outstanding                
Granted (in shares)   464,744            
Weighted-Average Grant Date Fair Value                
Award vesting rights, percentage   100.00%            
Performance Shares | Granted August 2017 | Minimum                
Weighted-Average Grant Date Fair Value                
Award vesting rights, percentage   0.00%            
Performance Shares | Granted August 2017 | Maximum                
Weighted-Average Grant Date Fair Value                
Award vesting rights, percentage   150.00%