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Income Taxes - Deferred Income Taxes - Narrative (Detail) - USD ($) $ in Thousands | 12 Months Ended |
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May 01, 2016 | May 03, 2015
Income Taxes [Line Items] |  |
Non-current deferred income tax asset | $ 2,319 | $ 5,169
Non-current deferred income tax liability | 1,483 | 982
U.S. Tax Authorities [Member] |  |
Income Taxes [Line Items] |  |
Operating loss carryforwards | 18,000 |
Operating loss carryforwards, related future tax benefits | $ 6,900 |
U.S. foreign income tax credits, expiration period | 10 years |
U.S. foreign income tax credits, expiration fiscal year | 2026 |
Non-current deferred income tax asset | $ 1,700 | 4,300
U.S. Tax Authorities [Member] | Minimum [Member] |  |
Income Taxes [Line Items] |  |
Operating loss carryforwards, expiration period | 10 years |
U.S. Tax Authorities [Member] | Maximum [Member] |  |
Income Taxes [Line Items] |  |
Operating loss carryforwards, expiration period | 19 years |
China [Member] |  |
Income Taxes [Line Items] |  |
Non-current deferred income tax asset | $ 572 | 868
Canada [Member] |  |
Income Taxes [Line Items] |  |
Non-current deferred income tax liability | $ 1,483 | $ 982

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- Definition Amount, after allocation of valuation allowances and deferred tax liability, of deferred tax asset attributable to deductible differences and carryforwards, netted by jurisdiction and classified as noncurrent. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=37586315&loc=d3e31917-109318 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=37586315&loc=d3e31931-109318 + Details
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