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Accounts Receivable (Detail) (USD $)
In Thousands, unless otherwise specified
Aug. 03, 2014
Apr. 27, 2014
Jul. 28, 2013
Apr. 28, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Customers $ 25,212 $ 28,461 $ 25,829  
Accounts receivable, net 24,239 27,409 [1] 24,493  
Allowance for doubtful accounts [Member]
       
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Valuation allowance, balance (438) (573) (743) (780)
Reserve for returns and allowances and discounts [Member]
       
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Valuation allowance, balance $ (535) $ (479) $ (593) $ (543)
[1] Derived from audited financial statements.