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Equity Incentive Plans - Restricted Stock (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended
Jan. 31, 2019
Jul. 31, 2019
Jul. 31, 2018
Jul. 31, 2019
Jul. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock-based compensation expense   $ 58,404 $ 53,654 $ 120,561 $ 97,609
Restricted Stock Units          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Issued (in shares)       8,792,982  
Compensation cost (in years)       3 years  
Number of Restricted Stock Outstanding          
Unvested, Beginning balance (in shares)       21,917,550  
Vested (in shares)       (4,352,885)  
Unvested, Ending balance (in shares) 21,917,550 25,032,953   25,032,953  
Weighted-Average Grant Date Fair Value          
Beginning balance (in dollars per share)       $ 17.94  
Vested (in dollars per share)       16.38  
Ending balance (in dollars per share) $ 17.94 $ 18.84   $ 18.84  
Aggregate Intrinsic Value $ 392,515 $ 378,999   $ 378,999  
Restricted Stock          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock-based compensation expense   7,400 $ 6,700 14,800 $ 10,200
Unrecognized stock-based compensation expense   $ 30,600   $ 30,600  
Compensation cost (in years)       2 years 3 months 18 days  
Number of Restricted Stock Outstanding          
Unvested, Beginning balance (in shares)       2,267,569  
Granted and converted (in shares)       1,399,688  
Vested (in shares)       (843,321)  
Unvested, Ending balance (in shares) 2,267,569 2,823,936   2,823,936  
Weighted-Average Grant Date Fair Value          
Beginning balance (in dollars per share)       $ 18.70  
Granted and converted (in dollars per share)       20.30  
Vested (in dollars per share)       19.85  
Ending balance (in dollars per share) $ 18.70 $ 19.25   $ 19.25  
Aggregate Intrinsic Value $ 40,612 $ 42,754   $ 42,754  
Restricted Stock | Performance Vesting at Maximum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Issued (in shares) 183,902 60,716   1,291,194  
Award vesting rights (as a percent) 100.00%        
Restricted Stock | Maximum | Performance Vesting at Maximum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting rights (as a percent) 160.00%        
Restricted Stock | Minimum | Performance Vesting at Maximum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting rights (as a percent) 0.00%