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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 |  |  |  |  |  |  |  |  |

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