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Consolidated Statements of Shareholders' Equity (Parentheticals) |  |  |  | 12 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Apr. 28, 2012 Preferred Stock [Member] Series C Preferred Stock [Member] | Apr. 30, 2011 Preferred Stock [Member] Series C Preferred Stock [Member] | May 01, 2010 Preferred Stock [Member] Series C Preferred Stock [Member] | Apr. 27, 2013 Preferred Stock [Member] Series D Preferred Stock [Member] | Apr. 27, 2013 Common Stock [Member] | Apr. 28, 2012 Common Stock [Member] | Apr. 30, 2011 Common Stock [Member] | Apr. 27, 2013 Preferred Treasury Stock [Member] | Apr. 28, 2012 Preferred Treasury Stock [Member] | Apr. 30, 2011 Preferred Treasury Stock [Member] | Apr. 27, 2013 Common Treasury Stock [Member] | Apr. 28, 2012 Common Treasury Stock [Member] | Apr. 30, 2011 Common Treasury Stock [Member]
Beginning of period | 150,000 | 150,000 | 150,000 |  | 50,322,000 | 50,262,000 | 50,189,000 | 150,000 | 150,000 | 150,000 | 4,033,000 | 4,033,000 | 4,033,000
Beginning of period |  |  |  | 400,000 |  |  |  |  |  |  |  |  |
End of period | 150,000 | 150,000 | 150,000 | 400,000 |  | 50,322,000 | 50,262,000 | 150,000 | 150,000 | 150,000 | 4,033,000 | 4,033,000 | 4,033,000
Options exercised |  |  |  |  | 40,000 | 60,000 | 73,000 |  |  |  |  |  |

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- Definition Number of shares of stock issued as of the balance sheet date, including shares that had been issued and were previously outstanding but which are now held in the treasury. + References Reference 1: 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 Number of new stock issued during the 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 SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + 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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