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Long-Term Debt and Lines of Credit (Detail) (USD $) In Thousands, unless otherwise specified	Jan. 27, 2013	Apr. 29, 2012		Jan. 29, 2012
Debt Instrument [Line Items]
Long-term debt	$ 6,766	$ 9,123
Current maturities of long-term debt	(2,366)	(2,404)	[1]	(2,400)
Long-term debt, less current maturities of long-term debt	4,400	6,719	[1]	6,766
Unsecured senior term notes [Member]
Debt Instrument [Line Items]
Long-term debt	6,600	8,800
Government Of Quebec Term Loan [Member]
Debt Instrument [Line Items]
Long-term debt	$ 166	$ 323
[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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Carrying amount of long-term debt, net of 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.

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