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Long-Term Debt and Lines of Credit - Long-Term Debt - Narrative (Detail) - USD ($)
 12 Months Ended
Aug. 11, 2015
May 01, 2016
May 03, 2015
Apr. 27, 2014
Aug. 11, 2008
Debt Instrument [Line Items]          
Interest paid   $ 95,000 $ 268,000 $ 466,000  
Unsecured term notes [Member]          
Debt Instrument [Line Items]          
Issuance of unsecured 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      
Required debt payment frequency   Annual      
Date of first required principal payment   Aug. 11, 2011      
Last annual payment paid $ 2,200,000