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Note K - Stock-Based Compensation Plans (Details) - Stock Option Activity (USD $) In Thousands, except Share data, unless otherwise specified | 12 Months Ended
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Apr. 30, 2014 | Apr. 30, 2013 | Apr. 30, 2012 | Apr. 30, 2011
Note K - Stock-Based Compensation Plans (Details) - Stock Option Activity [Line Items] |  |  |  |
Number of Shares (in Shares) | 1,117,000 | 1,122,500 | 1,118,250 | 1,133,147
Intrinsic Value (in Dollars) | $ 24,294 | $ 23,892 | $ 22,881 | $ 21,897
Weighted Average Exercise Price per Share | $ 21.75 | $ 21.28 | $ 20.46 | $ 19.32
Number of Shares (in Shares) | 25,000 | 40,000 | 73,750 |
Exercise Price per Share | $ 44.90 | $ 45.02 | $ 31.93 |
Intrinsic Value (in Dollars) | 1,122 | 1,801 | 2,355 |
Weighted Average Exercise Price per Share | $ 44.90 | $ 45.02 | $ 31.93 |
Number of Shares (in Shares) | (30,500) | (35,750) | (88,647) |
Exercise Price per Share | $ 23.58 | $ 22.13 | $ 15.46 |
Intrinsic Value (in Dollars) | $ (720) | $ (790) | $ (1,371) |
Weighted Average Exercise Price per Share | $ 23.58 | $ 22.13 | $ 15.46 |
Minimum [Member] |  |  |  |
Note K - Stock-Based Compensation Plans (Details) - Stock Option Activity [Line Items] |  |  |  |
Exercise Price per Share | $ 11.90 | $ 11.90 | $ 11.83 | $ 6.59
Exercise Price per Share | $ 44.52 | $ 44.14 | $ 24.69 |
Weighted Average Exercise Price per Share | $ 44.52 | $ 44.14 | $ 24.69 |
Exercise Price per Share | $ 23.34 | $ 11.83 | $ 6.59 |
Weighted Average Exercise Price per Share | $ 23.34 | $ 11.83 | $ 6.59 |
Maximum [Member] |  |  |  |
Note K - Stock-Based Compensation Plans (Details) - Stock Option Activity [Line Items] |  |  |  |
Exercise Price per Share | $ 46.44 | $ 45.72 | $ 45.72 | $ 24.47
Exercise Price per Share | $ 46.44 | $ 45.46 | $ 45.72 |
Weighted Average Exercise Price per Share | $ 46.44 | $ 45.46 | $ 45.72 |
Exercise Price per Share | $ 23.75 | $ 23.34 | $ 24.69 |
Weighted Average Exercise Price per Share | $ 23.75 | $ 23.34 | $ 24.69 |

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- Definition The cash inflow associated with the amount received from holders on the exercise of granted stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately. + References No definition available. + Details
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- Definition The cash inflow associated with the amount received from holders on the exercise of outstanding stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately. + References No definition available. + Details
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- Definition The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which option holders acquired shares when converting their stock options into shares. + References No definition available. + Details
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- Definition Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options. + References No definition available. + Details
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- Definition The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of share options (or share units) exercised during the current period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: 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 Reference 3: 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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.28,29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
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