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Receivables (Details) - USD ($)
$ in Thousands
3 Months Ended
Jul. 29, 2017
Apr. 29, 2017
Receivables    
Allowance for doubtful accounts $ 2,612 $ 2,610
Retainage on construction-type contracts, expected to be collected in one year 1,724 1,857
Financing Receivable    
Receivables    
Long-term contracts and lease receivables, present value 4,403 4,890
Long-term contracts and lease receivables, face amount $ 4,753 $ 5,201
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%