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Income Taxes - Deferred Income Taxes - Narrative (Detail) (USD $)						12 Months Ended
	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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The period (in years) over which the net operating loss carryforwards will expire.

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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

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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).

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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).

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Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

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