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Receivables - (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Apr. 26, 2014
Apr. 27, 2013
Apr. 26, 2014
Financing Receivable
Apr. 27, 2013
Financing Receivable
Apr. 26, 2014
Financing Receivable
Minimum
Apr. 26, 2014
Financing Receivable
Maximum
Receivables            
Allowance for doubtful accounts $ 2,539 $ 2,729        
Long-term contracts and lease receivables, present value     13,112 16,132    
Contract and lease receivables annual interest rates         5.00% 10.00%
Long-term contracts and lease receivables, face amount     14,892 18,731    
Retainage on construction-type contracts, expected to be collected in one year $ 2,098 $ 803