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Contracts - Schedule of Costs Estimated Earnings and Billings on Uncompleted Contracts (Details) - USD ($)
$ in Thousands
Dec. 29, 2018
Dec. 30, 2017
Contractors [Abstract]    
Costs incurred on uncompleted contracts $ 34,800 $ 57,916
Estimated earnings on uncompleted contracts 6,921 15,423
Earned revenues 41,721 73,339
Less: billings to date 39,150 69,400
Net costs in excess of billings on uncompleted contracts 2,571 3,939
Costs and estimated earnings in excess of billings on uncompleted contracts 3,175 5,273
Billings in excess of costs and estimated earnings on uncompleted contracts (604) (1,334)
Net costs in excess of billings on uncompleted contracts $ 2,571 $ 3,939