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Summary of Foreign Currency Exchange Gains (Losses) by Geographic Area (Detail) - USD ($) $ in Thousands	12 Months Ended
	May. 03, 2015	Apr. 27, 2014	Apr. 28, 2013
Foreign Currency Exchange Gain And Loss [Line Items]
Foreign currency exchange gains (losses)	$ 131	$ (665)	$ (208)
China [Member]
Foreign Currency Exchange Gain And Loss [Line Items]
Foreign currency exchange gains (losses)	241	(571)	(158)
Canada [Member]
Foreign Currency Exchange Gain And Loss [Line Items]
Foreign currency exchange gains (losses)	(108)	(44)	(10)
Poland [Member]
Foreign Currency Exchange Gain And Loss [Line Items]
Foreign currency exchange gains (losses)	$ (2)	$ (50)	$ (40)

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- Definition

Foreign Currency Exchange Gain And Loss [Line Items]

+ References

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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



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-Section 45



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-URI http://asc.fasb.org/extlink&oid=6450189&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=6450189&loc=d3e30690-110894

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