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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 | (5,392) |  |  | 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 |  |  |  |  |  |  |  |  |

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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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