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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] | Treasury Stock [Member] | Treasury Stock [Member] Class A [Member] | Treasury Stock [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] | Total | Class A [Member] | Class B [Member]
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Adjustment Due to Adoption of New Revenue Standard | $ 0 | $ 0 | $ 0 |  |  | $ 4,503 |  |  | $ 0 |  |  | $ 0 |  |  | $ 4,503 |  |
Balance at Apr. 30, 2018 | 70,111 | 13,071 | 407,120 |  |  | 1,834,057 |  |  | (694,222) |  |  | (439,580) |  |  | 1,190,557 |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted Shares Issued under Stock-based Compensation Plans | 0 | 0 | (2,156) |  |  | (1) |  |  | 2,203 |  |  | 0 |  |  | 46 |  |
Net (Payments)/Proceeds from Exercise of Stock Options and Other | 0 | 0 | 4,594 |  |  | 0 |  |  | 3,286 |  |  | 0 |  |  | 7,880 |  |
Stock-based Compensation Expense | 0 | 0 | 3,930 |  |  | 0 |  |  | 0 |  |  | 0 |  |  | 3,930 |  |
Purchase of Treasury Shares | 0 | 0 | 0 |  |  | 0 |  |  | (7,994) |  |  | 0 |  |  | (7,994) |  |
Common Stock Dividends | 0 | 0 |  | $ 0 | $ 0 |  | $ (16,022) | $ (3,021) |  | $ 0 | $ 0 |  | $ 0 | $ 0 |  | $ (16,022) | $ (3,021)
Common Stock Class Conversions | 4 | (4) | 0 |  |  | 0 |  |  | 0 |  |  | 0 |  |  | 0 |  |
Comprehensive (Loss) Income, Net of Tax | 0 | 0 | 0 |  |  | 26,295 |  |  | 0 |  |  | (32,166) |  |  | (5,871) |  |
Balance at Jul. 31, 2018 | 70,115 | 13,067 | 413,488 |  |  | 1,845,811 |  |  | (696,727) |  |  | (471,746) |  |  | 1,174,008 |  |
Balance at Apr. 30, 2019 | 70,127 | 13,055 | 422,305 |  |  | 1,931,074 |  |  | (746,476) |  |  | (508,738) |  |  | 1,181,347 |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted Shares Issued under Stock-based Compensation Plans | 0 | 0 | (2,112) |  |  | (1) |  |  | 2,219 |  |  | 0 |  |  | 106 |  |
Net (Payments)/Proceeds from Exercise of Stock Options and Other | 0 | 0 | 107 |  |  | 0 |  |  | (1,244) |  |  | 0 |  |  | (1,137) |  |
Stock-based Compensation Expense | 0 | 0 | 4,604 |  |  | 0 |  |  | 0 |  |  | 0 |  |  | 4,604 |  |
Purchase of Treasury Shares | 0 | 0 | 0 |  |  | 0 |  |  | (10,000) |  |  | 0 |  |  | (10,000) |  |
Common Stock Dividends | 0 | 0 |  | $ 0 | $ 0 |  | $ (16,148) | $ (3,104) |  | $ 0 | $ 0 |  | $ 0 | $ 0 |  | $ (16,148) | $ (3,104)
Common Stock Class Conversions | 12 | (12) | 0 |  |  | 0 |  |  | 0 |  |  | 0 |  |  | 0 |  |
Comprehensive (Loss) Income, Net of Tax | 0 | 0 | 0 |  |  | 3,624 |  |  | 0 |  |  | (27,286) |  |  | (23,662) |  |
Balance at Jul. 31, 2019 | $ 70,139 | $ 13,043 | $ 424,904 |  |  | $ 1,915,445 |  |  | $ (755,501) |  |  | $ (536,024) |  |  | $ 1,132,006 |  |

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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://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=118930883&loc=d3e557-108580 Reference 2: 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=118930883&loc=SL7669625-108580 Reference 3: 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=118930883&loc=SL7669619-108580 + Details
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- Definition Amount of paid and unpaid common stock dividends declared with the form of settlement in cash. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + 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://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=27010918&loc=d3e74512-122707 Reference 2: 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=6877327&loc=d3e13212-122682 Reference 3: 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=6877327&loc=d3e13212-122682 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(30)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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