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Uncompleted Contracts - Costs in Excess of Billings (Details) - USD ($)
$ in Thousands
Apr. 28, 2018
Apr. 29, 2017
Contractors [Abstract]    
Costs and estimated earnings in excess of billings $ 30,968 $ 36,403
Billings in excess of costs and estimated earnings (12,195) (10,897)
Costs in excess of billings, net $ 18,773 $ 25,506