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Receivables (Details) (USD $)
In Thousands, unless otherwise specified
9 Months Ended
Jan. 25, 2014
Apr. 27, 2013
Jan. 25, 2014
Financing Receivable
Apr. 27, 2013
Financing Receivable
Jan. 25, 2014
Financing Receivable
Minimum
Jan. 25, 2014
Financing Receivable
Maximum
Receivables            
Allowance for doubtful accounts $ 2,769 $ 2,729        
Long-term contracts and lease receivables, present value     13,929 16,132    
Contract and lease receivables annual interest rates         5.00% 10.00%
Long-term contracts and lease receivables, face amount     15,907 18,731    
Retainage on construction-type contracts, expected to be collected in one year $ 3,538 $ 803