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Receivables (Details) (USD $)
In Thousands, unless otherwise specified
6 Months Ended
Oct. 26, 2013
Apr. 27, 2013
Oct. 26, 2013
Financing Receivable
Apr. 27, 2013
Financing Receivable
Oct. 26, 2013
Financing Receivable
Minimum
Oct. 26, 2013
Financing Receivable
Maximum
Receivables            
Allowance for doubtful accounts $ 3,181 $ 2,729        
Long-term contracts and lease receivables, present value     15,751 16,132    
Contract and lease receivables annual interest rates         5.00% 10.00%
Long-term contracts and lease receivables, face amount     17,971 18,731    
Retainage on construction-type contracts, expected to be collected in one year $ 2,149 $ 803