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CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($)
$ in Thousands
Common Stock [Member]
Class A [Member]
Common Stock [Member]
Class A [Member]
Cumulative Effect, Period of Adoption, Adjustment [Member]
Common Stock [Member]
Class B [Member]
Common Stock [Member]
Class B [Member]
Cumulative Effect, Period of Adoption, Adjustment [Member]
Additional Paid-in Capital [Member]
Additional Paid-in Capital [Member]
Cumulative Effect, Period of Adoption, Adjustment [Member]
Additional Paid-in Capital [Member]
Class A [Member]
Additional Paid-in Capital [Member]
Class B [Member]
Retained Earnings [Member]
Retained Earnings [Member]
Cumulative Effect, Period of Adoption, Adjustment [Member]
Retained Earnings [Member]
Class A [Member]
Retained Earnings [Member]
Class B [Member]
Treasury Stock [Member]
Treasury Stock [Member]
Cumulative Effect, Period of Adoption, Adjustment [Member]
Treasury Stock [Member]
Class A [Member]
Treasury Stock [Member]
Class B [Member]
Accumulated Other Comprehensive Loss [Member]
Accumulated Other Comprehensive Loss [Member]
Cumulative Effect, Period of Adoption, Adjustment [Member]
Accumulated Other Comprehensive Loss [Member]
Class A [Member]
Accumulated Other Comprehensive Loss [Member]
Class B [Member]
Total
Cumulative Effect, Period of Adoption, Adjustment [Member]
Class A [Member]
Class B [Member]
Balance at Apr. 30, 2018 $ 70,111   $ 13,071   $ 407,120       $ 1,834,057       $ (694,222)       $ (439,580)       $ 1,190,557      
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                                
Restricted shares issued under stock-based compensation plans 0   0   (8,544)       3       8,826       0       285      
Net proceeds/(payments) from stock-based compensation and other 0   0   4,837       0       (1,086)       0       3,751      
Stock-based compensation expense 0   0   18,327       0       0       0       18,327      
Purchase of treasury shares 0   0   0       0       (59,994)       0       (59,994)      
Common stock dividends 0   0       $ 0 $ 0     $ (63,684) $ (12,068)     $ 0 $ 0     $ 0 $ 0     $ (63,684) $ (12,068)
Common stock class conversions 16   (16)   0       0       0       0       0      
Issuance of warrants related to acquisition of a business 0   0   565       0       0       0       565      
Adjustment due to adoption of new revenue standard | New Revenue Standard [Member]   $ 0   $ 0   $ 0       $ 4,503       $ 0       $ 0       $ 4,503    
Comprehensive income (loss), net of tax 0   0   0       168,263       0       (69,158)       99,105      
Balance at Apr. 30, 2019 70,127   13,055   422,305       1,931,074       (746,476)       (508,738)       1,181,347      
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                                
Restricted shares issued under stock-based compensation plans 0   0   (10,992)       0       11,347       0       355      
Net proceeds/(payments) from stock-based compensation and other 0   0   358       0       (4,152)       0       (3,794)      
Stock-based compensation expense 0   0   20,009       0       0       0       20,009      
Purchase of treasury shares 0   0   0       0       (46,589)       0       (46,589)      
Common stock dividends 0   0       0 0     (64,264) (12,394)     0 0     0 0     (64,264) (12,394)
Common stock class conversions 39   (39)   0       0       0       0       0      
Comprehensive income (loss), net of tax 0   0   0       (74,287)       0       (66,759)       (141,046)      
Balance at Apr. 30, 2020 70,166 $ 0 13,016 $ 0 431,680 $ 0     1,780,129 $ (1,390)     (785,870) $ 0     (575,497) $ 0     933,624 $ (1,390)    
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                                
Restricted shares issued under stock-based compensation plans 0   0   (10,206)       1       10,454       0       249      
Net proceeds/(payments) from stock-based compensation and other 0   0   902       0       (4,336)       0       (3,434)      
Stock-based compensation expense 0   0   21,982       0       0       0       21,982      
Purchase of treasury shares 0   0   0       0       (15,765)       0       (15,765)      
Common stock dividends 0   0       $ 0 $ 0     $ (67,614) $ (9,324)     $ 0 $ 0     $ 0 $ 0     $ (67,614) $ (9,324)
Common stock class conversions 42   (42)   0       0       0       0       0      
Comprehensive income (loss), net of tax     0   0       148,256       0       84,707       232,963      
Balance at Apr. 30, 2021 $ 70,208   $ 12,974   $ 444,358       $ 1,850,058       $ (795,517)       $ (490,790)       $ 1,091,291