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General and Summary of Significant Accounting Policies (Detail)
 3 Months Ended 12 Months Ended
Oct. 30, 2016
USD ($)
Apr. 30, 2017
USD ($)
Segment
May 01, 2016
USD ($)
May 03, 2015
USD ($)
Jan. 01, 2017
Apr. 27, 2014
USD ($)
Organization And Summary Of Significant Accounting Policies [Line Items]            
Number of business segments | Segment   2        
short-term investments   $ 2,443,000 $ 4,359,000      
long-term investments - rabbi trust   5,466,000 4,025,000      
purchase of long-term investments (held-to-maturity) $ 31,020,000 31,020,000        
long-term investments - held-to-maturity   30,945,000        
Fair value of held-to-maturity investments   $ 30,831,000        
Inventory aging categories   Inventory aging categories are six, nine, twelve, and fifteen months        
Interest costs incurred on long-term debt and lines of credit   $ 158,000 58,000 $ 235,000    
Interest cost capitalized   158,000 58,000 171,000    
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   4,600,000 4,200,000 $ 3,800,000    
Short-Term Investments [Member]            
Organization And Summary Of Significant Accounting Policies [Line Items]            
Unrealized gain (loss) on investments   (47,000) (100,000)      
Long-Term Investments (Rabbi Trust) [Member]            
Organization And Summary Of Significant Accounting Policies [Line Items]            
Unrealized gain (loss) on investments   $ 43,000 (44,000)      
Minimum [Member] | Long-Term Investments (Held-To-Maturity) [Member]            
Organization And Summary Of Significant Accounting Policies [Line Items]            
Investment maturity period   2 years        
Maximum [Member] | Long-Term Investments (Held-To-Maturity) [Member]            
Organization And Summary Of Significant Accounting Policies [Line Items]            
Investment maturity period   2 years 6 months        
CLIH [Member]            
Organization And Summary Of Significant Accounting Policies [Line Items]            
Equity method investment, ownership percentage   50.00%     50.00%  
Mattress Fabrics [Member]            
Organization And Summary Of Significant Accounting Policies [Line Items]            
goodwill   $ 11,462,000 $ 11,462,000