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Marketable Securities - Available-for-sale Securities (Details) (USD $) In Thousands, unless otherwise specified | Apr. 26, 2014 | Apr. 27, 2013
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Schedule of Available-for-sale Securities |  |
Amortized Cost | $ 25,392 | $ 24,024
Unrealized Gains | 14 | 28
Unrealized Losses | (8) | 0
Fair Value | 25,398 | 24,052
Certificates of deposit |  |
Schedule of Available-for-sale Securities |  |
Amortized Cost | 7,734 | 4,677
Unrealized Gains | 0 | 0
Unrealized Losses | 0 | 0
Fair Value | 7,734 | 4,677
U.S. Government securities |  |
Schedule of Available-for-sale Securities |  |
Amortized Cost | 2,000 | 4,999
Unrealized Gains | 2 | 19
Unrealized Losses | 0 | 0
Fair Value | 2,002 | 5,018
U.S. Government sponsored entities |  |
Schedule of Available-for-sale Securities |  |
Amortized Cost | 8,349 | 4,752
Unrealized Gains | 0 | 0
Unrealized Losses | (8) | 0
Fair Value | 8,341 | 4,752
Municipal obligations |  |
Schedule of Available-for-sale Securities |  |
Amortized Cost | 7,309 | 9,596
Unrealized Gains | 12 | 9
Unrealized Losses | 0 | 0
Fair Value | $ 7,321 | $ 9,605

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- Definition Available-for-sale Securities, Gross Unrealized Gain Accumulated in Investment + References No definition available. + Details
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- Definition Available-for-sale Securities, Gross Unrealized Loss Accumulated in Investment + References No definition available. + Details
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- Definition This item represents the cost of debt securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References No definition available. + Details
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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 + Details
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