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Summary of Foreign Currency Exchange Gains (Losses) by Geographic Area (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Apr. 29, 2018 | Apr. 30, 2017 | May 01, 2016
Foreign Currency Exchange Gain And Loss [Line Items] |  |  |
Foreign currency exchange gains (losses) | $ (306) | $ (9) | $ 6
China [Member] |  |  |
Foreign Currency Exchange Gain And Loss [Line Items] |  |  |
Foreign currency exchange gains (losses) | (298) | 111 | (70)
Canada [Member] |  |  |
Foreign Currency Exchange Gain And Loss [Line Items] |  |  |
Foreign currency exchange gains (losses) | $ (8) | $ (120) | $ 76

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- Definition Amount before tax of foreign currency transaction realized and unrealized gain (loss) recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450222&loc=d3e30840-110895 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64836518&loc=d3e30700-110894 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=64836518&loc=d3e30690-110894 + Details
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