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Long-Term Debt and Lines of Credit - Long-Term Debt - Narrative (Detail) (USD $)
 6 Months Ended
Nov. 02, 2014
Payment
Apr. 27, 2014
Oct. 27, 2013
Aug. 11, 2008
Debt Instrument [Line Items]        
Long-term debt $ 2,200,000 $ 4,400,000 $ 4,400,000  
Unsecured senior 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      
Date of first required principal payment Aug. 11, 2011      
Required debt payment frequency Annual      
Average term period for remaining principal payments, in years 9 months 18 days      
Maturity date Aug. 11, 2015      
Remaining annual payment 2,200,000      
Number of annual payment remaining 1      
Long-term debt, fair value $ 2,300,000 $ 4,600,000 $ 4,600,000