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Contracts (Details) - USD ($)
$ in Thousands
Dec. 26, 2020
Dec. 28, 2019
Contract with Customer, Contract Asset, Contract Liability, and Receivable [Abstract]    
Costs incurred on uncompleted contracts $ 39,154 $ 23,846
Estimated earnings on uncompleted contracts 4,388 5,188
Earned revenues 43,542 29,034
Less: billings to date 40,710 30,610
Net costs and estimated earnings in excess of billings 2,832 (1,576)
Costs and estimated earnings in excess of billings on uncompleted contracts 4,090 3,862
Billings in excess of costs and estimated earnings on uncompleted contracts (1,258) (5,438)
Net costs in excess of billings on uncompleted contracts $ 2,832 $ (1,576)