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Stock-Based Compensation (Narrative) (Details) - USD ($)
$ in Thousands, shares in Millions
12 Months Ended
Apr. 30, 2021
Apr. 30, 2020
Apr. 30, 2019
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]      
Stock based compensation expense $ 28,271 $ 28,045 $ 23,767
Tax benefit 1,802 7,175 6,076
Realized tax benefit $ 1,690 5,856 3,416
Shares reserved for future awards under stock-based compensation plans (in shares) 11.2    
Vesting period (in years), minimum 3 years    
Maximum contractual term 10 years    
Performance-Based Nonvested Share Units      
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]      
Vesting period (in years), minimum 3 years    
Nonvested Shares      
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]      
Fair value of shares vesting during period $ 16,100 $ 22,100 $ 17,900
Unrecognized compensation cost $ 37,900    
Weighted-average period of recognition (years) 2 years    
Minimum | 2003 Long-Term Executive Compensation Plan      
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]      
Percentage of performance-based share units that ultimately vest 0.00%    
Maximum | 2003 Long-Term Executive Compensation Plan      
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]      
Percentage of performance-based share units that ultimately vest 20000.00%