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Long-Term Debt and Lines of Credit (Detail) (USD $) In Thousands, unless otherwise specified	Jan. 26, 2014	Apr. 28, 2013		Jan. 27, 2013
Debt Instrument [Line Items]
Long-term debt	$ 4,400	$ 6,600		$ 6,766
Current maturities of long-term debt	(2,200)	(2,200)	[1]	(2,366)
Long-term debt, less current maturities of long-term debt	2,200	4,400	[1]	4,400
Unsecured senior term notes [Member]
Debt Instrument [Line Items]
Long-term debt	4,400	6,600		6,600
Canadian government loan [Member]
Debt Instrument [Line Items]
Long-term debt				$ 166
[1] Derived from audited financial statements.

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Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Amount of long-term debt, after unamortized discount or premium, scheduled to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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-Topic 210

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

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