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GOODWILL AND OTHER INTANGIBLE ASSETS - Gross Amount and Amortization (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 27, 2019 | Dec. 28, 2018 | Dec. 29, 2017
Goodwill and other intangible assets |  |  |
Gross Amount | $ 98,158,000 | $ 52,374,000 |
Gross Amount of Intangible Assets | 98,158,000 | 54,064,000 |
Accumulated Amortization | 21,321,000 | 9,700,000 |
Amortization expense for acquired identifiable intangible assets | 11,600,000 | 4,500,000 | $ 2,400,000
Estimated amortization expense for acquired identifiable intangible assets |  |  |
2020 | 13,025,000 |  |
2021 | 11,622,000 |  |
2022 | 11,233,000 |  |
2023 | 9,962,000 |  |
2024 | 6,871,000 |  |
Thereafter | 24,124,000 |  |
Total estimated amortization expense | 76,837,000 |  |
Goodwill impairment |  |  |
Goodwill impairment | 0 | 0 | $ 0
Backlog |  |  |
Goodwill and other intangible assets |  |  |
Gross Amount | 7,134,000 | 2,514,000 |
Accumulated Amortization | $ 3,763,000 | 2,155,000 |
Amortization Period (in years) | 1 year |  |
Tradename |  |  |
Goodwill and other intangible assets |  |  |
Gross Amount | $ 13,351,000 | 10,301,000 |
Accumulated Amortization | $ 4,882,000 | 3,118,000 |
Tradename | Minimum |  |  |
Goodwill and other intangible assets |  |  |
Amortization Period (in years) | 2 years 6 months |  |
Tradename | Maximum |  |  |
Goodwill and other intangible assets |  |  |
Amortization Period (in years) | 6 years |  |
Non-compete agreements |  |  |
Goodwill and other intangible assets |  |  |
Gross Amount | $ 2,320,000 | 1,420,000 |
Accumulated Amortization | $ 1,384,000 | 1,042,000 |
Non-compete agreements | Minimum |  |  |
Goodwill and other intangible assets |  |  |
Amortization Period (in years) | 4 years |  |
Non-compete agreements | Maximum |  |  |
Goodwill and other intangible assets |  |  |
Amortization Period (in years) | 5 years |  |
Developed technology |  |  |
Goodwill and other intangible assets |  |  |
Gross Amount | $ 14,620,000 | 12,920,000 |
Accumulated Amortization | $ 3,227,000 | 944,000 |
Amortization Period (in years) | 8 years |  |
In-process research and technology |  |  |
Goodwill and other intangible assets |  |  |
Gross Amount of Indefinite Lived Intangible Assets |  | 1,690,000 |
Customer relationships |  |  |
Goodwill and other intangible assets |  |  |
Gross Amount | $ 60,733,000 | 25,219,000 |
Accumulated Amortization | $ 8,065,000 | $ 2,441,000 |
Customer relationships | Minimum |  |  |
Goodwill and other intangible assets |  |  |
Amortization Period (in years) | 5 years |  |
Customer relationships | Maximum |  |  |
Goodwill and other intangible assets |  |  |
Amortization Period (in years) | 8 years |  |

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