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Accounts Receivable (Detail) (USD $)
In Thousands, unless otherwise specified
Jan. 26, 2014
Apr. 28, 2013
Jan. 27, 2013
Apr. 29, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Customers $ 27,424 $ 24,715 $ 25,533  
Accounts receivable, net 26,392 23,392 [1] 24,257  
Allowance for doubtful accounts [Member]
       
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Valuation allowance, balance (484) (780) (696) (567)
Reserve for returns and allowances and discounts [Member]
       
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Valuation allowance, balance $ (548) $ (543) $ (580) $ (478)
[1] Derived from audited financial statements.