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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, Net of Tax [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]
Class A [Member]
Treasury Stock [Member]
Class B [Member]
Total
Class A [Member]
Class B [Member]
Cumulative Effect of Change in Accounting Principle, Net of Tax [Member]
Common Stock [Member]
Class A [Member]
Cumulative Effect of Change in Accounting Principle, Net of Tax [Member]
Common Stock [Member]
Class B [Member]
Cumulative Effect of Change in Accounting Principle, Net of Tax [Member]
Additional Paid-in Capital [Member]
Cumulative Effect of Change in Accounting Principle, Net of Tax [Member]
Retained Earnings [Member]
Cumulative Effect of Change in Accounting Principle, Net of Tax [Member]
Accumulated Other Comprehensive Loss, Net of Tax [Member]
Cumulative Effect of Change in Accounting Principle, Net of Tax [Member]
Treasury Stock [Member]
Cumulative Effect of Change in Accounting Principle, Net of Tax [Member]
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                  
Purchases 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                  
Purchases 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                  
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 (7,920)     0     0     8,129     209                  
Issuance of Class A common stock related to the acquisition of a business 0   0     0     0     7,363     7,363                  
Impact of tax withholding on stock-based compensation and other 0 0 351     0     0     (5,819)     (5,468)                  
Stock-based compensation expense 0 0 20,376     0     0     0     20,376                  
Purchases of treasury shares 0 0 0     0     0     (24,867)     (24,867)                  
Common stock dividends 0 0   0 0   (48,537) (9,363)   0 0   0 0   (48,537) (9,363)              
Common stock class conversions 10 (10) 0     0     0     0     0                  
Comprehensive income, net of tax 0 0 0     105,163     (16,649)     0     88,514                  
Balance at Jan. 31, 2022 70,218 12,964 457,165     1,897,321     (507,439)     (810,711)     1,119,518                  
Balance at Oct. 31, 2021 70,211 12,971 451,808     1,881,235     (498,209)     (811,351)     1,106,665                  
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                                
Restricted shares issued under stock-based compensation plans 0 0 (944)     1     0     1,015     72                  
Issuance of Class A common stock related to the acquisition of a business 0   0     0     0     7,363     7,363                  
Impact of tax withholding on stock-based compensation and other 0 0 2     0     0     (238)     (236)                  
Stock-based compensation expense 0 0 6,299     0     0     0     6,299                  
Purchases of treasury shares 0 0 0     0     0     (7,500)     (7,500)                  
Common stock dividends 0 0   $ 0 $ 0   $ (16,162) $ (3,119)   $ 0 $ 0   $ 0 $ 0   $ (16,162) $ (3,119)              
Common stock class conversions 7 (7) 0     0     0     0     0                  
Comprehensive income, net of tax 0 0 0     35,366     (9,230)     0     26,136                  
Balance at Jan. 31, 2022 $ 70,218 $ 12,964 $ 457,165     $ 1,897,321     $ (507,439)     $ (810,711)     $ 1,119,518