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Equity Incentive Plans - Restricted Stock Units (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 12 Months Ended
Mar. 31, 2018
Aug. 31, 2017
Mar. 30, 2017
Jan. 31, 2019
Jan. 31, 2018
Jan. 31, 2017
Jan. 31, 2019
Jan. 31, 2018
Weighted-Average Grant Date Fair Value                
Stock-based compensation expense       $ 210,645 $ 150,673 $ 116,668    
Unrecognized compensation cost related to stock awards, weighted-average period       1 year 9 months 18 days        
Unvested restricted stock units                
Number of RSUs Outstanding                
Unvested, beginning balance (in shares)       17,682,646        
Granted (in shares)       15,891,112        
Vested (in shares)       (8,403,422)        
Forfeited (in shares)       (2,109,948)        
Converted (in shares) (1,375,210)     (1,142,838)        
Unvested, ending balance (in shares)       21,917,550 17,682,646      
Weighted-Average Grant Date Fair Value                
Unvested, beginning balance (in dollars per share)       $ 12.60        
Granted (in dollars per share)       20.73        
Vested (in dollars per share)       13.24        
Forfeited (in dollars per share)       16.09        
Unvested, ending balance (in dollars per share)       $ 17.94 $ 12.60      
Aggregate Intrinsic Value (in thousands)             $ 392,515 $ 356,117
Unrecognized employee compensation cost             $ 355,800  
Unrecognized compensation cost related to stock awards, weighted-average period       3 years        
Awards outstanding (in shares)       17,682,646 17,682,646   21,917,550 17,682,646
Share-based Compensation Arrangement By Share-based Payment Award, Equity Instruments Other Than Options, Conversions, Weighted Average Grant Date Fair Value       $ 11.86        
Performance Shares                
Weighted-Average Grant Date Fair Value                
Share-based Compensation Arrangement By Share-based Payment Award, Equity Instruments Other Than Options, Earned In Period       1,172,945        
Stock-based compensation expense       $ 300 $ 600 3,300    
Performance And Service Based [Member]                
Weighted-Average Grant Date Fair Value                
Share-based Compensation Arrangement By Share-based Payment Award, Equity Instruments Other Than Options, Earned In Period       183,902        
Restricted Stock                
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                
Total grant date fair value of options vested       $ 3,600        
Number of RSUs Outstanding                
Unvested, beginning balance (in shares)       0        
Granted (in shares)       2,138,810        
Granted and converted (in shares)       3,514,020        
Vested (in shares)       (145,232)        
Forfeited (in shares)       (1,101,219)        
Unvested, ending balance (in shares)       2,267,569 0      
Weighted-Average Grant Date Fair Value                
Unvested, beginning balance (in dollars per share)       $ 0.00        
Granted and converted (in dollars per share)       19.25        
Vested (in dollars per share)       12.84        
Forfeited (in dollars per share)       21.15        
Unvested, ending balance (in dollars per share)       $ 18.70 $ 0.00      
Aggregate Intrinsic Value (in thousands)             $ 40,612 $ 0
Stock-based compensation expense       $ 23,300        
Unrecognized stock-based compensation expense             $ 18,500  
Awards outstanding (in shares)       0 0   2,267,569 0
Granted March 2017 | Performance Shares                
Number of RSUs Outstanding                
Granted (in shares)     750,000          
Forfeited (in shares)     (77,000)          
Weighted-Average Grant Date Fair Value                
Award vesting rights, percentage     100.00%          
Share-based Compensation Arrangement By Share-based Payment Award, Equity Instruments Other Than Options, Earned In Period 780,000              
Stock-based compensation expense       $ 2,200 $ 4,200      
Unrecognized compensation cost related to stock awards, weighted-average period         2 years 2 months 12 days      
Granted August 2017 | Performance Shares                
Number of RSUs Outstanding                
Granted (in shares)   464,744            
Weighted-Average Grant Date Fair Value                
Award vesting rights, percentage   100.00%            
Minimum | Granted March 2017 | Performance Shares                
Weighted-Average Grant Date Fair Value                
Award vesting rights, percentage     0.00%          
Minimum | Granted August 2017 | Performance Shares                
Weighted-Average Grant Date Fair Value                
Award vesting rights, percentage   0.00%            
Maximum | Granted March 2017 | Performance Shares                
Weighted-Average Grant Date Fair Value                
Award vesting rights, percentage     150.00%          
Maximum | Granted August 2017 | Performance Shares                
Weighted-Average Grant Date Fair Value                
Award vesting rights, percentage   150.00%            
Performance Vesting Conditions | Restricted Stock                
Number of RSUs Outstanding                
Converted (in shares) (697,116)              
Service Vesting Conditions | Restricted Stock                
Number of RSUs Outstanding                
Converted (in shares) (678,094)              
Earned | Restricted Stock                
Number of RSUs Outstanding                
Converted (in shares) (486,501)              
Performance Vesting At Maximum | Restricted Stock                
Number of RSUs Outstanding                
Granted (in shares)       1,954,908        
Performance Vesting At Maximum | Minimum | Performance And Service Based [Member]                
Weighted-Average Grant Date Fair Value                
Award vesting rights, percentage       0.00%        
Performance Vesting At Maximum | Minimum | Restricted Stock                
Weighted-Average Grant Date Fair Value                
Award vesting rights, percentage       0.00%        
Performance Vesting At Maximum | Maximum | Performance And Service Based [Member]                
Weighted-Average Grant Date Fair Value                
Award vesting rights, percentage       160.00%        
Performance Vesting At Maximum | Maximum | Restricted Stock                
Weighted-Average Grant Date Fair Value                
Award vesting rights, percentage       180.00%        
Fair value | Unvested restricted stock units                
Weighted-Average Grant Date Fair Value                
Unrecognized employee compensation cost           $ 14,800 $ 184,800 $ 75,500