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Stock-Based Compensation, Performance-Based and Other Restricted Stock Activity (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
12 Months Ended
Apr. 30, 2022
Apr. 30, 2021
Apr. 30, 2020
Apr. 30, 2019
Apr. 30, 2018
Apr. 30, 2017
Apr. 30, 2016
Restricted Stock, Additional Disclosures [Abstract]              
Stock-based compensation expense $ 25,705 $ 21,982 $ 20,009        
Restricted Stock Awards [Member]              
Restricted Shares [Roll Forward]              
Nonvested shares at beginning of year (in shares) 1,280 943 756        
Granted (in shares) 658 706 759        
Change in shares due to performance (in shares)     (70)        
Change in shares due to performance (in shares) (3) 118          
Vested and issued (in shares) (432) (362) (329)        
Forfeited (in shares) (229) (125) (173)        
Nonvested shares at end of year (in shares) 1,274 1,280 943 756      
Weighted Average Grant Date Value [Abstract]              
Nonvested shares at beginning of year (in dollars per share) $ 45.73            
Granted (in dollars per share) 56.53            
Change in shares due to performance (in dollars per share) 30.41            
Vested and issued (in dollars per share) 50.87            
Forfeited (in dollars per share) 48.23            
Nonvested shares at end of year (in dollars per share) $ 49.17 $ 45.73          
Restricted Stock, Additional Disclosures [Abstract]              
Unrecognized share-based compensation expense $ 39,200            
Award vesting period 4 years            
Weighted average recognition period for unrecognized share-based compensation 2 years 4 months 24 days            
Total grant date fair value of restricted shares vested $ 22,000 $ 17,600 $ 17,500        
Restricted Stock Awards [Member] | Key Employees [Member] | Annual Vesting on Anniversary of Grant [Member]              
Stock-Based Compensation [Abstract]              
Award vesting percentage             25.00%
Performance-based Restricted Stock Awards [Member]              
Stock-Based Compensation [Abstract]              
Period for achievement of performance-based targets 3 years            
Performance-based Restricted Stock Awards [Member] | Vesting on June 30 Following End of Performance Cycle [Member]              
Stock-Based Compensation [Abstract]              
Award vesting percentage           50.00%  
Performance-based Restricted Stock Awards [Member] | Vesting on April 30 of Following Year [Member]              
Stock-Based Compensation [Abstract]              
Award vesting percentage           50.00%  
Performance-based Restricted Stock Awards [Member] | Key Employees [Member] | Vesting on June 30 Following End of Performance Cycle [Member]              
Stock-Based Compensation [Abstract]              
Award vesting percentage 100.00% 100.00% 100.00% 100.00% 100.00%