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Other Assets - Narrative (Detail) (USD $)
 9 Months Ended
Jan. 26, 2014
Jan. 27, 2013
Apr. 28, 2013
Other Assets Noncurrent [Line Items]      
Non-compete agreement carrying amount $ 1,047,000 $ 222,000 $ 185,000
Other assets [Member]
      
Other Assets Noncurrent [Line Items]      
Gross carrying amount of non-compete agreement 2,000,000 1,100,000 1,100,000
Gross carrying amount of customer relationships 868,000    
Number of life insurance contracts owned 2 3 2
Life insurance contracts, death benefits to insured 4,400,000 4,900,000 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 25,000    
Final payment date 2014-05    
Accumulated amortization 996,000 890,000 940,000
Amortization expense 56,000 148,000  
Remaining amortization expense for the remaining fiscal year 18,000    
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 754,000    
Weighted average remaining amortization period 14 years 3 months 18 days    
Other assets [Member] | Asset Purchase Agreement Dated August 11, 2008 [Member]
      
Other Assets Noncurrent [Line Items]      
Non-compete agreement carrying amount 209,000    
Other assets [Member] | Asset Purchase Agreement Dated May 8, 2013 [Member]
      
Other Assets Noncurrent [Line Items]      
Non-compete agreement carrying amount 838,000    
Other assets [Member] | Customer Relationships [Member]
      
Other Assets Noncurrent [Line Items]      
Useful life 17 years    
Accumulated amortization 38,000    
Amortization expense 38,000    
Remaining amortization expense for the remaining fiscal year 13,000    
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 $ 613,000    
Weighted average remaining amortization period 16 years 3 months 18 days