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Receivables - (Details) - USD ($)
$ in Thousands
12 Months Ended
Apr. 30, 2016
May 02, 2015
Receivables    
Allowance for doubtful accounts $ 2,797 $ 2,316
Retainage on construction-type contracts, expected to be collected in one year 437 385
Financing Receivable    
Receivables    
Long-term contracts and lease receivables, present value 7,038 9,874
Long-term contracts and lease receivables, face amount $ 7,236 $ 10,976
Financing Receivable | Minimum    
Receivables    
Contract and lease receivables annual interest rates 4.80%  
Financing Receivable | Maximum    
Receivables    
Contract and lease receivables annual interest rates 10.00%