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FAIR VALUE - Narrative (Details) - Level 3 - Contingent Consideration - USD ($) $ in Thousands | Sep. 25, 2021 | Dec. 26, 2020 | Sep. 26, 2020 | Dec. 28, 2019
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair value of contingent consideration | $ 61,329 | $ 2,328 | $ 2,220 | $ 712
Weighted average probability percentage of achieving maximum target | 60.00% |  |  |
Average Volatility |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Contingent consideration, measurement input | 0.35 |  |  |
Weighted Average Cost of Capital |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Contingent consideration, measurement input | 0.14 |  |  |
Maximum |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair value of contingent consideration | $ 102,000 |  |  |

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