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Environmnetal Matters (Details) (USD $)
 12 Months Ended
May 03, 2014
site
Apr. 27, 2013
Apr. 28, 2012
Site Contingency [Line Items]      
Number of plant sites subject to environmental investigation and/or remediation 2    
Accruals for environmental matters $ 2,700,000 $ 2,800,000  
Spent on remediation clean-ups and related studies 400,000 400,000 1,500,000
Other accrued expenses
      
Site Contingency [Line Items]      
Accruals for environmental matters $ 400,000 $ 500,000