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Note 2 - Correction of Immaterial Errors (Details) - Financial Revisions - Quarterly Statement of Income Data (unaudited) (Incomplete) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended
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Apr. 30, 2014 | Jan. 31, 2014 | Oct. 31, 2013 | Jul. 31, 2013 | Apr. 30, 2013 | Jan. 31, 2013 | Oct. 31, 2012 | Jul. 31, 2012 | Apr. 30, 2012 | Jan. 31, 2012 | Oct. 31, 2011 | Jul. 31, 2011 | Oct. 31, 2013 | Jan. 31, 2014 | Apr. 30, 2014 | Apr. 30, 2013 | Apr. 30, 2012
Cost of goods sold |  | $ 1,513,365 | $ 1,696,600 | $ 1,772,328 |  |  |  |  |  |  |  |  | $ 3,468,928 | $ 4,982,293 | $ 6,618,239 | $ 6,179,771 | $ 5,987,659
Interest, net |  | 10,123 | 9,896 | 9,576 |  |  |  |  |  |  |  |  | 19,472 | 29,595 | 39,915 | 35,265 | 35,192
Federal and state income taxes |  | 6,556 | 21,014 | 32,575 |  |  |  |  |  |  |  |  | 53,589 | 60,145 | 66,824 | 59,802 | 65,276
Net income | 20,932 | 12,653 | 39,430 | 53,795 | 21,604 | 13,757 | 31,146 | 37,307 | 21,509 | 16,162 | 37,632 | 39,391 | 93,225 | 105,878 | 126,820 | 103,814 | 114,694
Basic (in Dollars per share) | $ 0.54 | $ 0.33 | $ 1.03 | $ 1.40 | $ 0.56 | $ 0.36 | $ 0.81 | $ 0.98 | $ 0.56 | $ 0.42 | $ 0.99 | $ 1.04 | $ 2.43 | $ 2.76 | $ 3.30 | $ 2.71 | $ 3.01
Diluted (in Dollars per share) | $ 0.54 | $ 0.33 | $ 1.01 | $ 1.39 | $ 0.56 | $ 0.36 | $ 0.81 | $ 0.97 | $ 0.56 | $ 0.42 | $ 0.98 | $ 1.03 | $ 2.40 | $ 2.73 | $ 3.26 | $ 2.69 | $ 2.99
Scenario, Previously Reported [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost of goods sold |  | 1,510,182 | 1,693,584 | 1,769,239 |  |  |  |  |  |  |  |  | 3,462,823 | 4,973,005 | 6,605,996 | 6,168,475 | 5,984,114
Interest, net |  | 9,947 | 9,748 | 9,456 |  |  |  |  |  |  |  |  | 19,204 | 29,151 | 39,270 | 35,048 | 35,192
Federal and state income taxes |  | 7,899 | 22,289 | 33,869 |  |  |  |  |  |  |  |  | 56,158 | 64,057 | 72,018 | 64,504 | 66,724
Net income |  | $ 14,669 | $ 41,319 | $ 55,710 |  |  |  |  |  |  |  |  | $ 97,029 | $ 111,698 | $ 134,514 | $ 110,625 | $ 116,791
Basic (in Dollars per share) |  | $ 0.38 | $ 1.07 | $ 1.45 |  |  |  |  |  |  |  |  | $ 2.53 | $ 2.91 | $ 3.50 | $ 2.89 | $ 3.07
Diluted (in Dollars per share) |  | $ 0.38 | $ 1.06 | $ 1.43 |  |  |  |  |  |  |  |  | $ 2.50 | $ 2.87 | $ 3.46 | $ 2.86 | $ 3.04

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- Definition Total costs related to goods produced and sold during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 2 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.2(a)) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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