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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]
Accumulated Other Comprehensive Loss, Net of Tax [Member]
Accumulated Other Comprehensive Loss, Net of Tax [Member]
Cumulative Effect, Period of Adoption, Adjustment [Member]
Accumulated Other Comprehensive Loss, Net of Tax [Member]
Class A [Member]
Accumulated Other Comprehensive Loss, Net of Tax [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]
Total
Cumulative Effect, Period of Adoption, Adjustment [Member]
Class A [Member]
Class B [Member]
Balance at Apr. 30, 2019 $ 70,127   $ 13,055   $ 422,305       $ 1,931,074       $ (508,738)       $ (746,476)       $ 1,181,347      
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                                
Restricted shares issued under stock-based compensation plans 0   0   (10,992)       0       0       11,347       355      
Impact of tax withholding on stock-based compensation and other 0   0   358       0       0       (4,152)       (3,794)      
Stock-based compensation expense 0   0   20,009       0       0       0       20,009      
Purchases of treasury shares 0   0   0       0       0       (46,589)       (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, net of tax     0   0       (74,287)       (66,759)       0       (141,046)      
Balance at Apr. 30, 2020 70,166 $ 0 13,016 $ 0 431,680 $ 0     1,780,129 $ (1,390)     (575,497) $ 0     (785,870) $ 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       0       10,454       249      
Impact of tax withholding on stock-based compensation and other 0   0   902       0       0       (4,336)       (3,434)      
Stock-based compensation expense 0   0   21,982       0       0       0       21,982      
Purchases of treasury shares 0   0   0       0       0       (15,765)       (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, net of tax     0   0       148,256       84,707       0       232,963      
Balance at Apr. 30, 2021 70,208   12,974   444,358       1,850,058       (490,790)       (795,517)       1,091,291      
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                                
Restricted shares issued under stock-based compensation plans 0   0   (12,578)       (2)       0       12,854       274      
Issuance of Class A common stock related to the acquisition of a business 0   0   0       0       0       7,363       7,363      
Impact of tax withholding on stock-based compensation and other 0   0   814       0       0       (7,924)       (7,110)      
Stock-based compensation expense 0   0   26,703       0       0       0       26,703      
Purchases of treasury shares 0   0   0       0       0       (30,000)       (30,000)      
Common stock dividends 0   0       $ 0 $ 0     $ (64,724) $ (12,481)     $ 0 $ 0     $ 0 $ 0     $ (64,724) $ (12,481)
Common stock class conversions 18   (18)   0       0       0       0       0      
Comprehensive income, net of tax     0   0       148,309       (17,356)       0       130,953      
Balance at Apr. 30, 2022 $ 70,226   $ 12,956   $ 459,297       $ 1,921,160       $ (508,146)       $ (813,224)       $ 1,142,269