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Long-Term Debt and Lines of Credit - Long-Term Debt - Narrative (Detail)
 12 Months Ended
May. 03, 2015
USD ($)
Payment
Apr. 27, 2014
USD ($)
Apr. 28, 2013
USD ($)
Aug. 11, 2008
USD ($)
Debt Instrument [Line Items]        
Interest paid $ 268,000 $ 466,000 $ 666,000  
Unsecured senior term notes [Member]        
Debt Instrument [Line Items]        
Issuance of unsecured senior term notes       $ 11,000,000
Fixed interest rate       8.01%
Term of the note agreement 7 years      
Required amount of principal payment installments $ 2,200,000      
Date of first required principal payment Aug. 11, 2011      
Required debt payment frequency Annual      
Average term period for remaining principal payments, in years 3 months 18 days      
Maturity date Aug. 11, 2015      
Remaining annual payment due on August 11, 2015 $ 2,200,000      
Number of annual payment remaining | Payment 1