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Fair Value of Interest Rate Contracts (Detail) (USD $)
Apr. 28, 2012
Apr. 30, 2011
Other Noncurrent Assets
   
Derivatives, Fair Value [Line Items]    
Interest rate contracts, fair value $ 200 $ 5,500
Other Noncurrent Liabilities
   
Derivatives, Fair Value [Line Items]    
Interest rate contracts, fair value $ 200 $ 5,600