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Fair Value of Financial Instruments - Narrative (Detail) (Short-term investments [Member], USD $) | Jan. 26, 2014 | Apr. 28, 2013 | Jan. 27, 2013
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Short-term investments [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Short-term bond funds | $ 6,300,000 | $ 5,300,000 | $ 5,200,000
Unrealized gain (loss) on short-term bond funds | $ (74,000) | $ 54,000 | $ 26,000

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- Definition Net amount of accumulated unrealized gains (losses) on investments in available-for-sale securities impacting investments. Represents the difference between the fair value and cost of investments in available-for-sale securities. + 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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