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Contract Assets and Contract Liabilities (Details) - USD ($)
$ in Thousands
Mar. 28, 2020
Dec. 28, 2019
Contract with Customer, Contract Asset, Contract Liability, and Receivable [Abstract]    
Costs incurred on uncompleted contracts $ 21,869 $ 23,846
Estimated earnings on uncompleted contracts 2,848 5,188
Earned revenues 24,717 29,034
Less: billings to date 22,580 30,610
Net costs and estimated earnings in excess of billings (billings in excess of costs) on uncompleted contracts 2,137 (1,576)
Contract assets 5,774 3,862
Contract liabilities (3,637) (5,438)
Net contract assets $ 2,137 $ (1,576)