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Uncompleted Contracts - Costs in Excess of Billings (Details) - USD ($)
$ in Thousands
Apr. 29, 2017
Apr. 30, 2016
Contractors [Abstract]    
Costs and estimated earnings in excess of billings $ 36,403 $ 30,200
Billings in excess of costs and estimated earnings (10,897) (10,361)
Costs in excess of billings, net $ 25,506 $ 19,839