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Receivables (Details) (USD $)
In Thousands, unless otherwise specified
9 Months Ended
Jan. 26, 2013
Apr. 28, 2012
Jan. 26, 2013
Financing Receivable [Member]
Apr. 28, 2012
Financing Receivable [Member]
Jan. 26, 2013
Financing Receivable [Member]
Minimum
Jan. 26, 2013
Financing Receivable [Member]
Maximum
Receivables            
Allowance for doubtful accounts $ 2,201 $ 2,398        
Long-term contracts and lease receivables, present value     17,304 18,452    
Contract and lease receivables annual interest rates         5.80% 10.00%
Long-term contracts and lease receivables, face amount     20,249 21,494    
Retainage on construction-type contracts, expected to be collected in one year $ 275 $ 783