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Equity Incentive Plans - Restricted Stock Units (Details) - USD ($)
1 Months Ended 3 Months Ended
Aug. 31, 2017
Mar. 30, 2017
Apr. 30, 2018
Apr. 30, 2017
Jan. 31, 2018
Weighted-Average Grant Date Fair Value          
Compensation cost, weighted average term     2 years 2 months 12 days    
Stock-based compensation expense     $ 43,955,000 $ 32,219,000  
Restricted Stock Units          
Number of Restricted Stock Units Outstanding          
Unvested, Beginning balance (in shares)     17,682,646    
Granted (in shares)     6,364,772    
Vested (in shares)     (2,013,408)    
Forfeited (in shares)     (437,921)    
Converted (in shares)     (1,142,838)    
Unvested, Ending balance (in shares)     20,453,251    
Weighted-Average Grant Date Fair Value          
Beginning balance (in dollars per share)     $ 12.60    
Granted (in dollars per share)     20.06    
Vested (in dollars per share)     11.70    
Forfeited (in dollars per share)     13.68    
Converted (in dollars per share)     11.86    
Ending balance (in dollars per share)     $ 15.01    
Aggregate Intrinsic Value     $ 413,588,000   $ 356,117,000
Compensation not yet recognized     $ 275,700,000    
Compensation cost, weighted average term     3 years 1 month 6 days    
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     $ 700,000 $ 500,000  
Performance Shares | Granted March 2017 | Minimum          
Number of Restricted Stock Units Outstanding          
Award vesting rights, percentage   0.00%      
Performance Shares | Granted March 2017 | Maximum          
Number of Restricted Stock Units Outstanding          
Award vesting rights, percentage   150.00%      
Performance Shares | Granted August 2017          
Number of Restricted Stock Units Outstanding          
Granted (in shares) 464,744        
Award vesting rights, percentage 100.00%        
Weighted-Average Grant Date Fair Value          
Stock-based compensation expense     $ 0    
Performance Shares | Granted August 2017 | Minimum          
Number of Restricted Stock Units Outstanding          
Award vesting rights, percentage 0.00%        
Performance Shares | Granted August 2017 | Maximum          
Number of Restricted Stock Units Outstanding          
Award vesting rights, percentage 150.00%