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ACQUISITIONS - Finite-Lived and Indefinite-Lived Intangible Assets Acquired as Part of Business Combination (Details) - EdgeRock Technology Holdings, Inc - USD ($) | 9 Months Ended |
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Sep. 27, 2020 | Feb. 03, 2020
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Intangible assets | $ 11,274,000 | $ 11,274,000
Covenants not to compete |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Finite-lived intangible assets acquired | $ 302,000 |
Useful life | 5 years |
Client partner lists |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Finite-lived intangible assets acquired | $ 3,972,000 |
Useful life | 5 years |
Trade name |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Indefinite-lived intangible assets acquired | $ 7,000,000 |

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