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Uncompleted Contracts - Summary (Details) - USD ($)
$ in Thousands
Apr. 29, 2017
Apr. 30, 2016
Contractors [Abstract]    
Costs incurred $ 508,993 $ 530,594
Estimated earnings 161,611 173,356
Costs and estimated earnings on uncompleted contracts 670,604 703,950
Less billings to date 645,098 684,111
Costs in excess of billings, net $ 25,506 $ 19,839