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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 (5,304)     0     0     5,603     299                  
Impact of Tax Withholding on Stock-Based Compensation and Other 0 0 355     0     0     (1,951)     (1,596)                  
Stock-based Compensation Expense 0 0 15,662     0     0     0     15,662                  
Purchase of Treasury Shares 0 0 0     0     0     (35,000)     (35,000)                  
Common Stock Dividends 0 0   $ 0 $ 0   $ (48,331) $ (9,301)   $ 0 $ 0   $ 0 $ 0   $ (48,331) $ (9,301)              
Common Stock Class Conversions 29 (29) 0     0     0     0     0                  
Comprehensive Income, Net of Tax 0 0 0     83,757     10,398     0     94,155                  
Balance at Jan. 31, 2020 70,156 13,026 433,018     1,957,199     (498,340)     (777,824)     1,197,235     $ 70,156 $ 13,026 $ 433,018 $ 1,957,199 $ (498,340) $ (777,824) $ 1,197,235
Balance at Oct. 31, 2019 70,149 13,033 429,968     1,940,902     (505,026)     (770,030)     1,178,996                  
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                                
Restricted Shares Issued Under Stock-Based Compensation Plans 0 0 (2,512)     0     0     2,597     85                  
Impact of Tax Withholding on Stock-Based Compensation and Other 0 0 189     0     0     (391)     (202)                  
Stock-based Compensation Expense 0 0 5,373     0     0     0     5,373                  
Purchase of Treasury Shares 0 0 0     0     0     (10,000)     (10,000)                  
Common Stock Dividends 0 0   0 0   (16,049) (3,097)   0 0   0 0   (16,049) (3,097)              
Common Stock Class Conversions 7 (7) 0     0     0     0     0                  
Comprehensive Income, Net of Tax 0 0 0     35,443     6,686     0     42,129                  
Balance at Jan. 31, 2020 70,156 13,026 433,018     1,957,199     (498,340)     (777,824)     1,197,235     70,156 13,026 433,018 1,957,199 (498,340) (777,824) 1,197,235
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 (5,392)     2     0     5,575     185                  
Impact of Tax Withholding on Stock-Based Compensation and Other 0 0 371     0     0     (1,762)     (1,391)                  
Stock-based Compensation Expense 0 0 14,744     0     0     0     14,744                  
Purchase of Treasury Shares 0 0 0     0     0     (7,063)     (7,063)                  
Common Stock Dividends 0 0   0 0   (48,477) (9,325)   0 0   0 0   (48,477) (9,325)              
Common Stock Class Conversions 42 (42) 0     0     0     0     0                  
Comprehensive Income, Net of Tax 0 0 0     106,927     75,968     0     182,895                  
Balance at Jan. 31, 2021 70,208 12,974 441,403     1,827,866     (499,529)     (789,120)     1,063,802                  
Balance at Oct. 31, 2020 70,179 13,003 435,851     1,825,025     (541,642)     (782,203)     1,020,213                  
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                                
Restricted Shares Issued Under Stock-Based Compensation Plans 0 0 (128)     2     0     193     67                  
Impact of Tax Withholding on Stock-Based Compensation and Other 0 0 2     0     0     (47)     (45)                  
Stock-based Compensation Expense 0 0 5,678     0     0     0     5,678                  
Purchase of Treasury Shares 0 0 0     0     0     (7,063)     (7,063)                  
Common Stock Dividends 0 0   $ 0 $ 0   $ (16,220) $ (3,102)   $ 0 $ 0   $ 0 $ 0   $ (16,220) $ (3,102)              
Common Stock Class Conversions 29 (29) 0     0     0     0     0                  
Comprehensive Income, Net of Tax 0 0 0     22,161     42,113     0     64,274                  
Balance at Jan. 31, 2021 $ 70,208 $ 12,974 $ 441,403     $ 1,827,866     $ (499,529)     $ (789,120)     $ 1,063,802