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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]
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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 |  |  | 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 |  |  | $ 70,179 | $ 13,003 | $ 435,851 | $ 1,825,025 | $ (541,642) | $ (782,203) | $ 1,020,213
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 | (6,976) |  |  | (1) |  |  | 0 |  |  | 7,114 |  |  | 137 |  |  |  |  |  |  |  |  |
Impact of tax withholding on stock-based compensation and other | 0 | 0 | 349 |  |  | 0 |  |  | 0 |  |  | (5,581) |  |  | (5,232) |  |  |  |  |  |  |  |  |
Stock-based compensation expense | 0 | 0 | 14,077 |  |  | 0 |  |  | 0 |  |  | 0 |  |  | 14,077 |  |  |  |  |  |  |  |  |
Purchase of treasury shares | 0 | 0 | 0 |  |  | 0 |  |  | 0 |  |  | (17,367) |  |  | (17,367) |  |  |  |  |  |  |  |  |
Common stock dividends | 0 | 0 |  | 0 | 0 |  | (32,375) | (6,244) |  | 0 | 0 |  | 0 | 0 |  | (32,375) | (6,244) |  |  |  |  |  |  |
Common stock class conversions | 3 | (3) |  |  | 0 |  |  | 0 |  |  | 0 |  |  | 0 |  |  | 0 |  |  |  |  |  |  |
Comprehensive income, net of tax | 0 | 0 | 0 |  |  | 69,797 |  |  | (7,419) |  |  | 0 |  |  | 62,378 |  |  |  |  |  |  |  |  |
Balance at Oct. 31, 2021 | 70,211 | 12,971 | 451,808 |  |  | 1,881,235 |  |  | (498,209) |  |  | (811,351) |  |  | 1,106,665 |  |  |  |  |  |  |  |  |
Balance at Jul. 31, 2021 | 70,211 | 12,971 | 445,690 |  |  | 1,844,578 |  |  | (494,600) |  |  | (800,945) |  |  | 1,077,905 |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted shares issued under stock-based compensation plans | 0 | 0 | (634) |  |  | 2 |  |  | 0 |  |  | 705 |  |  | 73 |  |  |  |  |  |  |  |  |
Impact of tax withholding on stock-based compensation and other | 0 | 0 | 39 |  |  | 0 |  |  | 0 |  |  | (1,111) |  |  | (1,072) |  |  |  |  |  |  |  |  |
Stock-based compensation expense | 0 | 0 | 6,713 |  |  | 0 |  |  | 0 |  |  | 0 |  |  | 6,713 |  |  |  |  |  |  |  |  |
Purchase of treasury shares | 0 | 0 | 0 |  |  | 0 |  |  | 0 |  |  | (10,000) |  |  | (10,000) |  |  |  |  |  |  |  |  |
Common stock dividends | 0 | 0 |  | $ 0 | $ 0 |  | $ (16,190) | $ (3,122) |  | $ 0 | $ 0 |  | $ 0 | $ 0 |  | $ (16,190) | $ (3,122) |  |  |  |  |  |  |
Comprehensive income, net of tax | 0 | 0 | 0 |  |  | 55,967 |  |  | (3,609) |  |  | 0 |  |  | 52,358 |  |  |  |  |  |  |  |  |
Balance at Oct. 31, 2021 | $ 70,211 | $ 12,971 | $ 451,808 |  |  | $ 1,881,235 |  |  | $ (498,209) |  |  | $ (811,351) |  |  | $ 1,106,665 |  |  |  |  |  |  |  |  |

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- Definition Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(22)) -URI http://asc.fasb.org/extlink&oid=120400993&loc=SL114874131-224263 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(24)) -URI http://asc.fasb.org/extlink&oid=123367319&loc=SL114868664-224227 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=124509347&loc=d3e557-108580 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(26)) -URI http://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1B -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=124509347&loc=SL7669625-108580 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1A -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=124509347&loc=SL7669619-108580 + Details
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- Definition Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(g)(1)(ii)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 852 -SubTopic 10 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=84165509&loc=d3e56426-112766 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 4.E) -URI http://asc.fasb.org/extlink&oid=122038336&loc=d3e74512-122707 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(31)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(30)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 7: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 28 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=123596393&loc=d3e14064-108612 Reference 8: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571 + Details
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