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Restricted Stock (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended
Jan. 31, 2019
Apr. 30, 2019
Apr. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based compensation expense   $ 62,157 $ 43,955
Restricted Stock Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Issued (in shares)   6,547,013  
Compensation cost (in years)   3 years 1 month 6 days  
Number of Restricted Stock Outstanding      
Unvested, Beginning balance (in shares)   21,917,550  
Vested (in shares)   (2,076,099)  
Unvested, Ending balance (in shares) 21,917,550 25,939,489  
Weighted-Average Grant Date Fair Value      
Beginning balance (in dollars per share)   $ 17.94  
Vested (in dollars per share)   15.25  
Ending balance (in dollars per share) $ 17.94 $ 18.90  
Aggregate Intrinsic Value $ 392,515 $ 592,933  
Restricted Stock      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based compensation expense   7,500 $ 3,500
Unrecognized stock-based compensation expense   $ 40,000  
Compensation cost (in years)   2 years 7 months 6 days  
Number of Restricted Stock Outstanding      
Unvested, Beginning balance (in shares)   2,267,569  
Granted and converted (in shares)   1,338,972  
Vested (in shares)   (622,662)  
Unvested, Ending balance (in shares) 2,267,569 2,983,879  
Weighted-Average Grant Date Fair Value      
Beginning balance (in dollars per share)   $ 18.70  
Granted and converted (in dollars per share)   20.48  
Vested (in dollars per share)   20.76  
Ending balance (in dollars per share) $ 18.70 $ 19.18  
Aggregate Intrinsic Value $ 40,612 $ 68,211  
Restricted Stock | Performance Vesting at Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Issued (in shares) 183,902 1,230,478  
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%