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CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) $ in Thousands | Common Stock [Member] Class A [Member] | Common Stock [Member] Class B [Member] | Additional Paid-in Capital [Member] | Retained Earnings [Member] | Retained Earnings [Member] Class A [Member] | Retained Earnings [Member] Class B [Member] | Treasury Stock [Member] | Accumulated Other Comprehensive Loss [Member] | Total | Class A [Member] | Class B [Member]
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Balance at Apr. 30, 2014 | $ 69,798 | $ 13,392 | $ 327,588 | $ 1,489,069 |  |  | $ (527,308) | $ (190,291) | $ 1,182,248 |  |
Restricted Shares Issued under Stock-based Compensation Plans |  |  | (3,471) |  |  |  | 4,085 |  | 614 |  |
Net (Payments)/Proceeds from Exercise of Stock Options and Other |  |  | 12,093 |  |  |  | 13,230 |  | 25,323 |  |
Excess Tax Benefits from Stock-based Compensation |  |  | 3,191 |  |  |  |  |  | 3,191 |  |
Stock-based Compensation Expense |  |  | 13,617 |  |  |  |  |  | 13,617 |  |
Purchase of Treasury Shares |  |  |  |  |  |  | (61,981) |  | (61,981) |  |
Common Stock Dividends |  |  |  |  | $ (57,541) | $ (10,957) |  |  |  | $ (57,541) | $ (10,957)
Comprehensive Income (Loss) |  |  |  | 176,868 |  |  |  | (216,342) | (39,474) |  |
Balance at Apr. 30, 2015 | 69,798 | 13,392 | 353,018 | 1,597,439 |  |  | (571,974) | (406,633) | 1,055,040 |  |
Restricted Shares Issued under Stock-based Compensation Plans |  |  | (3,152) |  |  |  | 3,325 |  | 173 |  |
Net (Payments)/Proceeds from Exercise of Stock Options and Other |  |  | 1,700 |  |  |  | (1,795) |  | (95) |  |
Excess Tax Benefits from Stock-based Compensation |  |  | 1,027 |  |  |  |  |  | 1,027 |  |
Stock-based Compensation Expense |  |  | 16,105 |  |  |  |  |  | 16,105 |  |
Purchase of Treasury Shares |  |  |  |  |  |  | (69,977) |  | (69,977) |  |
Common Stock Dividends |  |  |  |  | (58,658) | (11,238) |  |  |  | (58,658) | (11,238)
Comprehensive Income (Loss) |  |  |  | 145,782 |  |  |  | (41,053) | 104,729 |  |
Balance at Apr. 30, 2016 | 69,798 | 13,392 | 368,698 | 1,673,325 |  |  | (640,421) | (447,686) | 1,037,106 |  |
Restricted Shares Issued under Stock-based Compensation Plans |  |  | (7,617) |  |  |  | 8,013 |  | 396 |  |
Net (Payments)/Proceeds from Exercise of Stock Options and Other |  |  | 8,849 |  |  |  | 6,657 |  | 15,506 |  |
Excess Tax Benefits from Stock-based Compensation |  |  | 414 |  |  |  |  |  | 414 |  |
Stock-based Compensation Expense |  |  | 17,552 |  |  |  |  |  | 17,552 |  |
Purchase of Treasury Shares |  |  |  |  |  |  | (50,326) |  | (50,326) |  |
Common Stock Dividends |  |  |  |  | $ (60,143) | $ (11,402) |  |  |  | $ (60,143) | $ (11,402)
Common Stock Class Conversions | 288 | (296) |  |  |  |  |  |  | (8) |  |
Comprehensive Income (Loss) |  |  |  | 113,643 |  |  |  | (59,601) | 54,042 |  |
Balance at Apr. 30, 2017 | $ 70,086 | $ 13,096 | $ 387,896 | $ 1,715,423 |  |  | $ (676,077) | $ (507,287) | $ 1,003,137 |  |

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- Definition This element represents the amount of recognized equity-based compensation during the period, that is, the amount recognized as expense in the income statement (or as asset if compensation is capitalized). Alternate captions include the words "stock-based compensation". + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 35 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=66904339&loc=d3e4534-113899 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 20 -Section 55 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=65896087&loc=d3e11149-113907 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 20 -Section 55 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=65896087&loc=d3e11178-113907 + Details
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- Definition Amount of increase in additional paid in capital (APIC) resulting from a tax benefit associated with share-based compensation plan other than an employee stock ownership plan (ESOP). Includes, but is not limited to, excess tax benefit. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 740 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=65880886&loc=d3e23524-113945 Reference 2: http://www.xbrl.org/2003/role/presentationRef -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 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 + Details
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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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Other Comprehensive Income -URI http://asc.fasb.org/extlink&oid=51831270 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Comprehensive Income -URI http://asc.fasb.org/extlink&oid=51831223 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=66004124&loc=d3e557-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Net Income -URI http://asc.fasb.org/extlink&oid=51831255 + Details
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- Definition Value of stock (or other type of equity) issued during the period as a result of any equity-based compensation plan other than an employee stock ownership plan (ESOP), net of stock value of such awards forfeited. Stock issued could result from the issuance of restricted stock, the exercise of stock options, stock issued under employee stock purchase plans, and/or other employee benefit plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -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 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + 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/2003/role/presentationRef -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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -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 3: http://www.xbrl.org/2003/role/presentationRef -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 4: http://www.xbrl.org/2003/role/presentationRef -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 + Details
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