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Other Assets - Narrative (Detail) (USD $)
 3 Months Ended
Jul. 28, 2013
Jul. 29, 2012
Apr. 28, 2013
Other Assets Noncurrent [Line Items]      
Non-compete agreement carrying amount $ 1,061,000   $ 185,000
Other assets [Member]
      
Other Assets Noncurrent [Line Items]      
Gross carrying amount of non-compete agreement 2,000,000   1,100,000
Gross carrying amount of customer relationships 868,000    
Number of life insurance contracts owned 2   2
Life insurance contracts, death benefits to insured 4,400,000   4,400,000
Other assets [Member] | Non-compete Agreement [Member]
      
Other Assets Noncurrent [Line Items]      
Useful life 15 years    
Quarterly payments 12,500    
Total remaining non-compete payments 50,000    
Final payment date 2014-05    
Accumulated amortization 958,000   940,000
Amortization expense 19,000 49,000  
Remaining amortization expense for the remaining fiscal year 53,000    
Remaining amortization expense for the second fiscal year 75,000    
Remaining amortization expense for the third fiscal year 75,000    
Remaining amortization expense for the fourth fiscal year 75,000    
Remaining amortization expense for the fifth fiscal year 75,000    
Remaining amortization expense for the fiscal year thereafter 758,000    
Weighted average remaining amortization period 14 years 9 months 18 days    
Other assets [Member] | Asset Purchase Agreement Dated August 11, 2008 [Member]
      
Other Assets Noncurrent [Line Items]      
Non-compete agreement carrying amount 194,000    
Other assets [Member] | Asset Purchase Agreement Dated May 8, 2013 [Member]
      
Other Assets Noncurrent [Line Items]      
Non-compete agreement carrying amount 867,000    
Other assets [Member] | Customer Relationships [Member]
      
Other Assets Noncurrent [Line Items]      
Useful life 17 years    
Accumulated amortization 13,000    
Amortization expense 13,000    
Remaining amortization expense for the remaining fiscal year 39,000    
Remaining amortization expense for the second fiscal year 51,000    
Remaining amortization expense for the third fiscal year 51,000    
Remaining amortization expense for the fourth fiscal year 51,000    
Remaining amortization expense for the fifth fiscal year 51,000    
Remaining amortization expense for the fiscal year thereafter $ 612,000    
Weighted average remaining amortization period 16 years 9 months 18 days