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Receivables - (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Apr. 27, 2013
Apr. 28, 2012
Apr. 27, 2013
Financing Receivable
Apr. 28, 2012
Financing Receivable
Apr. 27, 2013
Financing Receivable
Minimum
Apr. 27, 2013
Financing Receivable
Maximum
Receivables            
Allowance for doubtful accounts $ 2,729 $ 2,398        
Long-term contracts and lease receivables, present value     16,132 18,452    
Contract and lease receivables annual interest rates         5.80% 10.00%
Long-term contracts and lease receivables, face amount     18,731 21,494    
Retainage on construction-type contracts, expected to be collected in one year $ 803 $ 783