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Fair Value of Financial Instruments - Narrative (Detail) (USD $)	Apr. 28, 2013	Apr. 29, 2012
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	$ 6,600,000	$ 9,123,000
Long-term debt, fair value	$ 7,000,000	$ 8,100,000

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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