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General and Summary of Significant Accounting Policies (Detail) (USD $)
 12 Months Ended
Apr. 27, 2014
Segment
Apr. 28, 2013
Apr. 29, 2012
May 01, 2011
Organization And Summary Of Significant Accounting Policies [Line Items]        
Number of business segments 2      
cash and cash equivalents $ 29,303,000 $ 23,530,000 $ 25,023,000 $ 23,181,000
Accumulated unrealized (loss) gain on short-term investments (60,000) 54,000    
short-term investments 6,294,000 5,286,000    
Long-term investments at fair value 765,000      
Inventory aging categories Inventory aging categories are six, nine, twelve, and fifteen months.      
Interest costs 0 0 0  
Foreign currency exchange gain (loss) (626,000) (222,000) 215,000  
goodwill 11,462,000 11,462,000 11,462,000 11,462,000
Mattress Fabrics [Member]
        
Organization And Summary Of Significant Accounting Policies [Line Items]        
goodwill 11,462,000 11,462,000    
Selling, general and administrative expense [Member]
        
Organization And Summary Of Significant Accounting Policies [Line Items]        
Handling costs 3,500,000 3,200,000 2,600,000  
United States [Member]
        
Organization And Summary Of Significant Accounting Policies [Line Items]        
short-term investments 1,000,000 1,000,000    
Subsidiaries [Member] | China [Member]
        
Organization And Summary Of Significant Accounting Policies [Line Items]        
cash and cash equivalents 15,300,000 10,200,000    
short-term investments 0 0    
Foreign currency exchange gain (loss) (571,000) (158,000) 320,000  
Subsidiaries [Member] | Canada [Member]
        
Organization And Summary Of Significant Accounting Policies [Line Items]        
cash and cash equivalents 9,100,000 5,000,000    
short-term investments 5,300,000 4,200,000    
Foreign currency exchange gain (loss) (44,000) (10,000) (19,000)  
Subsidiaries [Member] | Poland [Member]
        
Organization And Summary Of Significant Accounting Policies [Line Items]        
cash and cash equivalents 162,000 100,000    
short-term investments 0 0    
Foreign currency exchange gain (loss) $ (50,000) $ (40,000) $ (145,000)