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Receivables (Details) - USD ($)
$ in Thousands
3 Months Ended
Jul. 30, 2016
Apr. 30, 2016
Receivables    
Allowance for doubtful accounts $ 2,263 $ 2,797
Retainage on construction-type contracts, expected to be collected in one year 293 437
Financing Receivable    
Receivables    
Long-term contracts and lease receivables, present value 6,606 7,038
Long-term contracts and lease receivables, face amount $ 6,585 $ 7,236
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%