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CONDENSED CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - UNAUDITED - USD ($)
$ in Thousands
Common Stock [Member]
Class A [Member]
Common Stock [Member]
Class B [Member]
Additional Paid-in Capital [Member]
Additional Paid-in Capital [Member]
Class A [Member]
Additional Paid-in Capital [Member]
Class B [Member]
Retained Earnings [Member]
Retained Earnings [Member]
Class A [Member]
Retained Earnings [Member]
Class B [Member]
Accumulated Other Comprehensive Loss [Member]
Accumulated Other Comprehensive Loss [Member]
Class A [Member]
Accumulated Other Comprehensive Loss [Member]
Class B [Member]
Treasury Stock [Member]
Treasury Stock [Member]
Class A [Member]
Treasury Stock [Member]
Class B [Member]
Total
Class A [Member]
Class B [Member]
Cumulative Effect, Period of Adoption, Adjustment [Member]
Common Stock [Member]
Class A [Member]
Cumulative Effect, Period of Adoption, Adjustment [Member]
Common Stock [Member]
Class B [Member]
Cumulative Effect, Period of Adoption, Adjustment [Member]
Additional Paid-in Capital [Member]
Cumulative Effect, Period of Adoption, Adjustment [Member]
Retained Earnings [Member]
Cumulative Effect, Period of Adoption, Adjustment [Member]
Accumulated Other Comprehensive Loss [Member]
Cumulative Effect, Period of Adoption, Adjustment [Member]
Treasury Stock [Member]
Cumulative Effect, Period of Adoption, Adjustment [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 (2,793)     0     0     3,006     213                  
Impact of tax withholding on stock-based compensation and other 0 0 167     0     0     (1,560)     (1,393)                  
Stock-based Compensation Expense 0 0 10,289     0     0     0     10,289                  
Purchase of Treasury Shares 0 0 0     0     0     (25,000)     (25,000)                  
Common Stock Dividends 0 0   $ 0 $ 0   $ (32,278) $ (6,208)   $ 0 $ 0   $ 0 $ 0   $ (32,278) $ (6,208)              
Common Stock Class Conversions 22 (22) 0     0     0     0     0                  
Comprehensive Income, Net of Tax 0 0 0     48,314     3,712     0     52,026                  
Balance at Oct. 31, 2019 70,149 13,033 429,968     1,940,902     (505,026)     (770,030)     1,178,996     $ 70,149 $ 13,033 $ 429,968 $ 1,940,902 $ (505,026) $ (770,030) $ 1,178,996
Balance at Jul. 31, 2019 70,139 13,043 424,904     1,915,445     (536,024)     (755,501)     1,132,006                  
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                                
Restricted Shares Issued under Stock-based Compensation Plans 0 0 (681)     1     0     787     107                  
Impact of tax withholding on stock-based compensation and other 0 0 60     0     0     (316)     (256)                  
Stock-based Compensation Expense 0 0 5,685     0     0     0     5,685                  
Purchase of Treasury Shares 0 0 0     0     0     (15,000)     (15,000)                  
Common Stock Dividends 0 0   0 0   (16,130) (3,104)   0 0   0 0   (16,130) (3,104)              
Common Stock Class Conversions 10 (10) 0     0     0     0     0                  
Comprehensive Income, Net of Tax 0 0 0     44,690     30,998     0     75,688                  
Balance at Oct. 31, 2019 70,149 13,033 429,968     1,940,902     (505,026)     (770,030)     1,178,996     70,149 13,033 429,968 1,940,902 (505,026) (770,030) 1,178,996
Balance at Apr. 30, 2020 70,166 13,016 431,680     1,780,129     (575,497)     (785,870)     933,624     $ 0 $ 0 $ 0 $ (1,390) $ 0 $ 0 $ (1,390)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                                
Restricted Shares Issued under Stock-based Compensation Plans 0 0 (5,264)     0     0     5,382     118                  
Impact of tax withholding on stock-based compensation and other 0 0 369     0     0     (1,715)     (1,346)                  
Stock-based Compensation Expense 0 0 9,066     0     0     0     9,066                  
Common Stock Dividends 0 0   0 0   (32,257) (6,223)   0 0   0 0   (32,257) (6,223)              
Common Stock Class Conversions 13 (13) 0     0     0     0     0                  
Comprehensive Income, Net of Tax 0 0 0     84,766     33,855     0     118,621                  
Balance at Oct. 31, 2020 70,179 13,003 435,851     1,825,025     (541,642)     (782,203)     1,020,213                  
Balance at Jul. 31, 2020 70,177 13,005 431,241     1,775,813     (534,118)     (782,373)     973,745                  
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                                
Restricted Shares Issued under Stock-based Compensation Plans 0 0 (143)     (1)     0     198     54                  
Impact of tax withholding on stock-based compensation and other 0 0 1     0     0     (28)     (27)                  
Stock-based Compensation Expense 0 0 4,752     0     0     0     4,752                  
Common Stock Dividends 0 0   $ 0 $ 0   $ (16,108) $ (3,111)   $ 0 $ 0   $ 0 $ 0   $ (16,108) $ (3,111)              
Common Stock Class Conversions 2 (2) 0     0     0     0     0                  
Comprehensive Income, Net of Tax 0 0 0     68,432     (7,524)     0     60,908                  
Balance at Oct. 31, 2020 $ 70,179 $ 13,003 $ 435,851     $ 1,825,025     $ (541,642)     $ (782,203)     $ 1,020,213