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Stock Repurchases (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Oct. 31, 2019
Apr. 30, 2019
Apr. 30, 2020
Apr. 30, 2019
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]        
Options Exercised     6,898,000  
Weighted Average Exercise Price     $ 18.40  
Employee Stock-Based Tax Withholding (in 000s)     $ 101,300 $ 45,600
Chief Executive Officer [Member] | Common Stock        
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]        
Options Exercised 4,000,000      
Weighted Average Exercise Price $ 17.81      
Shares Net Settled for Exercise 865,719      
Shares Withheld for Taxes(1) 1,231,595      
Net Shares to Employees 1,902,686      
Weighted Average Share Price for Withholding $ 82.29      
Employee Stock-Based Tax Withholding (in 000s) $ 101,348      
President | Common Stock        
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]        
Options Exercised   3,000,000    
Weighted Average Exercise Price   $ 17.81    
Shares Net Settled for Exercise   945,162    
Shares Withheld for Taxes(1)   806,039    
Net Shares to Employees   1,248,799    
Weighted Average Share Price for Withholding   $ 56.53    
Employee Stock-Based Tax Withholding (in 000s)   $ 45,565