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Receivables (Details) - USD ($)
$ in Thousands
9 Months Ended
Jan. 28, 2017
Apr. 30, 2016
Receivables    
Allowance for doubtful accounts $ 2,512 $ 2,797
Retainage on construction-type contracts, expected to be collected in one year 1,302 437
Financing Receivable    
Receivables    
Long-term contracts and lease receivables, present value 5,105 7,038
Long-term contracts and lease receivables, face amount $ 5,635 $ 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%