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Stock Repurchases (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Oct. 31, 2019
Apr. 30, 2021
Apr. 30, 2020
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]      
Options Exercised   1,148,000  
Weighted Average Exercise Price   $ 25.12  
Employee Stock-Based Tax Withholding (in 000s)     $ 101,300
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 Employee 1,902,686    
Weighted Average Share Price for Withholding $ 82.29    
Employee Stock-Based Tax Withholding (in 000s) $ 101,348