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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

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- Definition

Amount of interest paid on finance lease liability.

+ References

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Amount of cash outflow for principal payment on finance lease.

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Amount of cash outflow from operating lease, excluding payments to bring another asset to condition and location necessary for its intended use.

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Amount of increase in right-of-use asset obtained in exchange for operating lease liability.

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