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Long-Lived Assets - Intangible Assets (Details) (USD $) In Thousands, unless otherwise specified | Apr. 27, 2013 | Apr. 28, 2012
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Schedule of Definite-Lived Intangible and Indefinite-Lived Intangible Assets [Line Items] |  |
Accumulated Amortization | $ 1,502 | $ 1,274
Indefinite-lived assets | 401 | 401
Definite-lived and Indefinite lived, Gross Carrying Amount | 2,683 | 2,683
Intangibles, net | 1,181 | 1,409
Patents |  |
Schedule of Definite-Lived Intangible and Indefinite-Lived Intangible Assets [Line Items] |  |
Definite-lived, Gross Carrying Amount | 2,282 | 2,282
Accumulated Amortization | 1,502 | 1,274
Definite-lived, Net Value | $ 780 | $ 1,008

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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=7658586&loc=d3e16323-109275 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 45 -Subparagraph a(1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=7658586&loc=d3e16323-109275 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 45 -Subparagraph a(1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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