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FAIR VALUE - Fair Value of Assets and Liabilities (Details) - Fair Value, Recurring - USD ($) $ in Thousands | Jun. 26, 2021 | Dec. 26, 2020
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash equivalents | $ 1,592 | $ 2,273
Other assets: |  |
Life insurance policies | 40,652 | 35,770
Total assets measured at fair value | 42,244 | 38,043
Other current liabilities measured at fair value: |  |
Contingent consideration | 23,531 |
Other long-term liabilities measured at fair value: |  |
Contingent consideration | 13,776 | 2,328
Total liabilities measured at fair value | 37,307 | 2,328
Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash equivalents | 0 | 0
Other assets: |  |
Life insurance policies | 0 | 0
Total assets measured at fair value | 0 | 0
Other current liabilities measured at fair value: |  |
Contingent consideration | 0 |
Other long-term liabilities measured at fair value: |  |
Contingent consideration | 0 | 0
Total liabilities measured at fair value | 0 | 0
Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash equivalents | 1,592 | 2,273
Other assets: |  |
Life insurance policies | 40,652 | 35,770
Total assets measured at fair value | 42,244 | 38,043
Other current liabilities measured at fair value: |  |
Contingent consideration | 0 |
Other long-term liabilities measured at fair value: |  |
Contingent consideration | 0 | 0
Total liabilities measured at fair value | 0 | 0
Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash equivalents | 0 | 0
Other assets: |  |
Life insurance policies | 0 | 0
Total assets measured at fair value | 0 | 0
Other current liabilities measured at fair value: |  |
Contingent consideration | 23,531 |
Other long-term liabilities measured at fair value: |  |
Contingent consideration | 13,776 | 2,328
Total liabilities measured at fair value | $ 37,307 | $ 2,328

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