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General and Summary of Significant Accounting Policies (Detail)
 12 Months Ended
May. 03, 2015
USD ($)
Segment
Apr. 27, 2014
USD ($)
Apr. 28, 2013
USD ($)
Apr. 29, 2012
USD ($)
Organization And Summary Of Significant Accounting Policies [Line Items]        
Number of business segments | Segment 2      
Accumulated unrealized (loss) gain on short-term investments $ (95,000) $ (60,000)    
short-term investments 10,004,000 6,294,000    
Long-term investments at fair value $ 2,415,000 765,000    
Inventory aging categories Inventory aging categories are six, nine, twelve, and fifteen months      
Interest costs $ 171,000 0 $ 0  
goodwill 11,462,000 11,462,000 11,462,000 $ 11,462,000
Selling, general and administrative expenses [Member]        
Organization And Summary Of Significant Accounting Policies [Line Items]        
Handling costs $ 3,800,000 3,500,000 $ 3,200,000  
Minimum [Member]        
Organization And Summary Of Significant Accounting Policies [Line Items]        
Short-term investments, maturity period 3 months      
Mattress Fabrics [Member]        
Organization And Summary Of Significant Accounting Policies [Line Items]        
goodwill $ 11,500,000 $ 11,500,000