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LEASES - Supplemental cash flow information (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 27, 2019
Dec. 28, 2018
Dec. 29, 2017
Cash paid for amounts included in the measurement of lease liabilities:      
Operating cash flow from operating leases $ 5,151    
Operating cash flow from finance leases 36    
Financing cash flow from finance leases 639 $ 367 $ 390
Right-of-use assets obtained in exchange for lease liabilities for operating leases $ 4,918