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Receivables (Details) - USD ($)
$ in Thousands
6 Months Ended
Oct. 27, 2018
Apr. 28, 2018
Receivables    
Allowance for doubtful accounts $ 2,236 $ 2,151
Retainage on construction-type contracts, expected to be collected in one year 2,013 964
Financing Receivable    
Receivables    
Long-term contracts and lease receivables, present value 2,653 3,393
Long-term contracts and lease receivables, face amount $ 2,929 $ 3,733
Financing Receivable | Minimum    
Receivables    
Contract and lease receivables annual interest rates 4.80%  
Financing Receivable | Maximum    
Receivables    
Contract and lease receivables annual interest rates 9.00%