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Receivables (Details) (USD $)
In Thousands, unless otherwise specified
6 Months Ended
Nov. 01, 2014
Apr. 26, 2014
Nov. 01, 2014
Financing Receivable
Apr. 26, 2014
Financing Receivable
Nov. 01, 2014
Financing Receivable
Minimum
Nov. 01, 2014
Financing Receivable
Maximum
Receivables            
Allowance for doubtful accounts $ 2,403 $ 2,539        
Long-term contracts and lease receivables, present value     10,893 13,112    
Contract and lease receivables annual interest rates         5.00% 10.00%
Long-term contracts and lease receivables, face amount     12,790 14,892    
Retainage on construction-type contracts, expected to be collected in one year $ 456 $ 2,098