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CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($)
$ in Thousands
 12 Months Ended
Apr. 30, 2023
Apr. 30, 2022
Apr. 30, 2021
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Balance $ 1,142,269 $ 1,091,291 $ 933,624
Restricted shares issued under stock-based compensation plans 287 274 249
Issuance of Class A common stock related to the acquisition of a business   7,363  
Impact of tax withholding on stock-based compensation and other (8,002) (7,110) (3,434)
Stock-based compensation expense 26,520 26,703 21,982
Purchases of treasury shares (35,000) (30,000)  
Common stock class conversions 0 0 0
Comprehensive income, net of tax (3,523) 130,953 232,963
Balance 1,045,027 1,142,269 1,091,291
Cumulative Effect of Change in Accounting Principle      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Balance     (1,390)
Class A      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Purchases of treasury shares     (15,765)
Common stock dividends (64,973) (64,724) (67,614)
Class B      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Common stock dividends (12,551) (12,481) (9,324)
Common Stock | Class A      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Balance 70,226 70,208 70,166
Common stock class conversions 5 18 42
Balance 70,231 70,226 70,208
Common Stock | Class B      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Balance 12,956 12,974 13,016
Common stock class conversions (5) (18) (42)
Balance 12,951 12,956 12,974
Additional paid-in capital      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Balance 459,297 444,358 431,680
Restricted shares issued under stock-based compensation plans (16,152) (12,578) (10,206)
Impact of tax withholding on stock-based compensation and other 137 814 902
Stock-based compensation expense 26,520 26,703 21,982
Balance 469,802 459,297 444,358
Retained earnings      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Balance 1,921,160 1,850,058 1,780,129
Restricted shares issued under stock-based compensation plans 3 (2) 1
Comprehensive income, net of tax 17,233 148,309 148,256
Balance 1,860,872 1,921,160 1,850,058
Retained earnings | Cumulative Effect of Change in Accounting Principle      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Balance     (1,390)
Retained earnings | Class A      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Common stock dividends (64,973) (64,724) (67,614)
Retained earnings | Class B      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Common stock dividends (12,551) (12,481) (9,324)
Accumulated other comprehensive loss, net of tax      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Balance (508,146) (490,790) (575,497)
Comprehensive income, net of tax (20,756) (17,356) 84,707
Balance (528,902) (508,146) (490,790)
Treasury stock      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Balance (813,224) (795,517) (785,870)
Restricted shares issued under stock-based compensation plans 16,436 12,854 10,454
Issuance of Class A common stock related to the acquisition of a business   7,363  
Impact of tax withholding on stock-based compensation and other (8,139) (7,924) (4,336)
Purchases of treasury shares (35,000) (30,000)  
Balance $ (839,927) $ (813,224) (795,517)
Treasury stock | Class A      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Purchases of treasury shares     $ (15,765)