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General and Summary of Significant Accounting Policies (Detail)
 12 Months Ended
May 03, 2015
USD ($)
May 01, 2016
USD ($)
Segment
May 03, 2015
USD ($)
Apr. 27, 2014
USD ($)
Apr. 28, 2013
USD ($)
Organization And Summary Of Significant Accounting Policies [Line Items]          
Number of business segments | Segment   2      
short-term investments $ 10,004,000 $ 4,359,000 $ 10,004,000    
long-term investments 2,415,000 $ 4,025,000 2,415,000    
Inventory aging categories   Inventory aging categories are six, nine, twelve, and fifteen months      
Interest costs incurred on long-term debt and lines of credit   $ 58,000 235,000 $ 427,000  
Interest cost capitalized   58,000 171,000 0  
goodwill 11,462,000 11,462,000 11,462,000 11,462,000 $ 11,462,000
Accounting Standards Update 2015-17 [Member]          
Organization And Summary Of Significant Accounting Policies [Line Items]          
Increased noncurrent deferred income taxes 4,700,000        
Decreased noncurrent deferred tax liabilities (68,000)        
Short-Term Investments [Member]          
Organization And Summary Of Significant Accounting Policies [Line Items]          
Unrealized gain (loss) on investments (95,000) (100,000) (95,000)    
Long-Term Investments [Member]          
Organization And Summary Of Significant Accounting Policies [Line Items]          
Unrealized gain (loss) on investments   (44,000)      
Selling, general and administrative expenses [Member]          
Organization And Summary Of Significant Accounting Policies [Line Items]          
Handling costs   $ 4,200,000 3,800,000 $ 3,500,000  
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 $ 11,500,000