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Long-Term Debt and Lines of Credit (Detail) (USD $) In Thousands, unless otherwise specified	Apr. 28, 2013	Apr. 29, 2012
Debt Instrument [Line Items]
Long-term debt	$ 6,600	$ 9,123
current maturities of long-term debt	(2,200)	(2,404)
long-term debt, less current maturities	4,400	6,719
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		$ 323

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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