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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 | (5,121) |  |  | 1 |  |  | 0 |  |  | 5,184 |  |  | 64 |  |  |  |  |  |  |  |  |
Impact of tax withholding on stock-based compensation and other | 0 | 0 | 368 |  |  | 0 |  |  | 0 |  |  | (1,687) |  |  | (1,319) |  |  |  |  |  |  |  |  |
Stock-based compensation expense | 0 | 0 | 4,314 |  |  | 0 |  |  | 0 |  |  | 0 |  |  | 4,314 |  |  |  |  |  |  |  |  |
Common stock dividends | 0 | 0 |  | $ 0 | $ 0 |  | $ (16,149) | $ (3,112) |  | $ 0 | $ 0 |  | $ 0 | $ 0 |  | $ (16,149) | $ (3,112) |  |  |  |  |  |  |
Common stock class conversions | 11 | (11) | 0 |  |  | 0 |  |  | 0 |  |  | 0 |  |  | 0 |  |  |  |  |  |  |  |  |
Comprehensive income, net of tax | 0 | 0 | 0 |  |  | 16,334 |  |  | 41,379 |  |  | 0 |  |  | 57,713 |  |  |  |  |  |  |  |  |
Balance at Jul. 31, 2020 | 70,177 | 13,005 | 431,241 |  |  | 1,775,813 |  |  | (534,118) |  |  | (782,373) |  |  | 973,745 |  |  |  |  |  |  |  |  |
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 | (6,342) |  |  | (3) |  |  | 0 |  |  | 6,409 |  |  | 64 |  |  |  |  |  |  |  |  |
Impact of tax withholding on stock-based compensation and other | 0 | 0 | 310 |  |  | 0 |  |  | 0 |  |  | (4,470) |  |  | (4,160) |  |  |  |  |  |  |  |  |
Stock-based compensation expense | 0 | 0 | 7,364 |  |  | 0 |  |  | 0 |  |  | 0 |  |  | 7,364 |  |  |  |  |  |  |  |  |
Purchase of treasury shares | 0 | 0 | 0 |  |  | 0 |  |  | 0 |  |  | (7,367) |  |  | (7,367) |  |  |  |  |  |  |  |  |
Common stock dividends | 0 | 0 |  | $ 0 | $ 0 |  | $ (16,185) | $ (3,122) |  | $ 0 | $ 0 |  | $ 0 | $ 0 |  | $ (16,185) | $ (3,122) |  |  |  |  |  |  |
Common stock class conversions | 3 | (3) | 0 |  |  | 0 |  |  | 0 |  |  | 0 |  |  | 0 |  |  |  |  |  |  |  |  |
Comprehensive income, net of tax | 0 | 0 | 0 |  |  | 13,830 |  |  | (3,810) |  |  | 0 |  |  | 10,020 |  |  |  |  |  |  |  |  |
Balance at Jul. 31, 2021 | $ 70,211 | $ 12,971 | $ 445,690 |  |  | $ 1,844,578 |  |  | $ (494,600) |  |  | $ (800,945) |  |  | $ 1,077,905 |  |  |  |  |  |  |  |  |

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