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Accounts Receivable (Detail) (USD $)
In Thousands, unless otherwise specified
Nov. 02, 2014
Apr. 27, 2014
Oct. 27, 2013
Apr. 28, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Customers $ 26,082 $ 28,461 $ 26,022  
Accounts receivable, net 25,045 27,409 [1] 24,937  
Allowance for doubtful accounts [Member]
       
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Valuation allowance, balance (442) (573) (513) (780)
Reserve for returns and allowances and discounts [Member]
       
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Valuation allowance, balance $ (595) $ (479) $ (572) $ (543)
[1] Derived from audited financial statements.