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LEASES - Impact of Adoption (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 27, 2019 | Dec. 28, 2018 | Dec. 29, 2017
Operating leases: |  |  |
Right-of-use assets | $ 22,297,000 |  |
Lease liability | $ 5,550,000 |  |
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List] | Lease liability |  |
Lease liability, less current portion | $ 18,411,000 |  |
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] | Lease liability, less current portion |  |
Total lease obligations | $ 23,961,000 |  |
Operating Lease, Liability, Statement of Financial Position [Extensible List] | Total lease obligations |  |
Finance leases (included in equipment and leasehold improvements, net): |  |  |
Equipment and leasehold improvements, gross | $ 27,334,000 | $ 19,783,000 |
Accumulated depreciation | (15,283,000) | (11,785,000) |
Total equipment and leasehold improvements, net | 12,051,000 | 7,998,000 |
Finance lease obligations | 375,000 | 320,000 |
Finance lease obligations, less current portion | 191,000 | 224,000 |
Total lease obligations | $ 566,000 |  |
Operating Leases | 4 years 7 months 2 days |  |
Finance Leases | 1 year 5 months 19 days |  |
Operating Leases, discount rate | 5.14% |  |
Finance Leases, discount rate | 4.80% |  |
Opertaing lease, rent expense | $ 6,190,000 |  |
Operating Leases, Rent Expense, Net |  | $ 4,486,000 | $ 3,624,000
Finance Leases |  |  |
Finance leases (included in equipment and leasehold improvements, net): |  |  |
Equipment and leasehold improvements, gross | 1,957,000 |  |
Accumulated depreciation | (1,291,000) |  |
Total equipment and leasehold improvements, net | $ 666,000 |  |

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