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Income Taxes - Deferred Income Taxes - Narrative (Detail) (USD $) |  |  |  |  |  | 12 Months Ended |  |  |  |
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Apr. 27, 2014 | Apr. 28, 2013 | Apr. 27, 2014 U.S. Tax Authorities [Member] | Apr. 28, 2013 U.S. Tax Authorities [Member] | Apr. 29, 2012 U.S. Tax Authorities [Member] | Apr. 27, 2014 U.S. Tax Authorities [Member] Minimum [Member] | Apr. 27, 2014 U.S. Tax Authorities [Member] Maximum [Member] | Apr. 27, 2014 China [Member] | Apr. 28, 2013 China [Member] | Apr. 27, 2014 Canada [Member] | Apr. 28, 2013 Canada [Member]
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating loss carryforwards |  |  | $ 45,700,000 | $ 50,700,000 | $ 59,900,000 |  |  |  |  |  |
Operating loss carryforwards, expiration period |  |  |  |  |  | 11 years | 18 years |  |  |  |
Current deferred tax asset | 6,230,000 | 7,709,000 | 5,800,000 | 7,400,000 |  |  |  | 372,000 | 325,000 |  |
Non-current deferred tax asset | 2,040,000 | 753,000 | 1,400,000 |  |  |  |  | 572,000 | 753,000 |  |
Non-current deferred tax liability | $ 1,013,000 | $ 3,075,000 |  | $ 2,000,000 |  |  |  |  |  | $ 1,000,000 | $ 1,100,000

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- Definition Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards, net of deferred tax liability attributable to taxable temporary differences expected to be realized or consumed within one year or operating cycle, if longer. + References Reference 1: 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=21917399&loc=d3e31917-109318 Reference 2: 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 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=21917399&loc=d3e31931-109318 + Details
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- Definition Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards, net of deferred tax liability attributable to taxable temporary differences expected to be realized or consumed after one year (or the normal operating cycle, if longer). + References Reference 1: 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=21917399&loc=d3e31917-109318 Reference 2: 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 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=21917399&loc=d3e31931-109318 + Details
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- Definition Amount of deferred tax liability attributable to taxable temporary differences, net of deferred tax asset attributable to deductible temporary differences and carryforwards net of valuation allowances expected to be realized or consumed after one year (or the normal operating cycle, if longer). + References Reference 1: 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=21917399&loc=d3e31917-109318 Reference 2: 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=21917399&loc=d3e31931-109318 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=21917399&loc=d3e31958-109318 + Details
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