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Other Assets - Narrative (Detail) (Other assets [Member], USD $)
 3 Months Ended
Jul. 29, 2012
Jul. 31, 2011
Apr. 29, 2012
Other Assets Noncurrent [Line Items]      
Number of life insurance contracts owned 4   4
Life insurance contracts, death benefits to insured $ 12,900,000   $ 12,900,000
Non-compete agreement from Bodet & Horst [Member]
      
Other Assets Noncurrent [Line Items]      
Useful life 6 years    
Quarterly payments 12,500    
Total remaining non-compete payments 100,000    
Non-compete agreements [Member]
      
Other Assets Noncurrent [Line Items]      
Gross carrying amount 1,100,000   1,100,000
Accumulated amortization 790,000   741,000
Amortization expense 49,000 49,000  
Remaining amortization expense for the remaining fiscal year 148,000    
Remaining amortization expense for the second fiscal year 198,000    
Remaining amortization expense for the third fiscal year $ 49,000    
Weighted average remaining amortization period 2.0 years