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Summary of Short-Term Investments by Geographic Area (Detail) - USD ($) $ in Thousands | May. 03, 2015 | Apr. 27, 2014
--- | --- | ---
Schedule of Investments [Line Items] |  |
short-term investments | $ 10,004 | $ 6,294
Canada [Member] |  |
Schedule of Investments [Line Items] |  |
short-term investments | 7,333 | 5,247
China [Member] |  |
Schedule of Investments [Line Items] |  |
short-term investments | 1,612 |
United States [Member] |  |
Schedule of Investments [Line Items] |  |
short-term investments | $ 1,059 | $ 1,047

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- Definition Investments which are intended to be sold in the short term (usually less than one year or the normal operating cycle, whichever is longer) including trading securities, available-for-sale securities, held-to-maturity securities, and other short-term investments not otherwise listed in the existing taxonomy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Subparagraph g -Article 7 + Details
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