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REVENUE RECOGNITION - Percentage of completion (Details) - USD ($)
$ in Thousands
Mar. 28, 2020
Dec. 28, 2019
Mar. 30, 2019
REVENUE RECOGNITION      
Cost and Earnings in Excess of Billings $ 5,744 $ 4,960 $ 7,880
Billings in Excess of Cost and Earnings $ 9,920 $ 6,622 $ 5,020