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Uncompleted Contracts - Summary (Details) - USD ($)
$ in Thousands
Apr. 30, 2016
May 02, 2015
Contractors [Abstract]    
Costs incurred $ 530,594 $ 708,029
Estimated earnings 173,356 237,239
Costs and estimated earnings on uncompleted contracts 703,950 945,268
Less billings to date 684,111 933,997
Costs in excess of billings, net $ 19,839 $ 11,271