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Contract Assets and Contract Liabilities (Details) - USD ($)
$ in Thousands
Sep. 26, 2020
Dec. 28, 2019
Contract with Customer, Contract Asset, Contract Liability, and Receivable [Abstract]    
Costs incurred on uncompleted contracts $ 33,565 $ 23,846
Estimated earnings on uncompleted contracts 3,467 5,188
Earned revenues 37,032 29,034
Less: billings to date 36,709 30,610
Net costs and estimated earnings in excess of billings (billings in excess of costs) on uncompleted contracts 323 (1,576)
Contract assets 3,055 3,862
Contract liabilities (2,732) (5,438)
Net contract assets $ 323 $ (1,576)