FAIR VALUE - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Dec. 25, 2021	Dec. 26, 2020
Current assets measured at fair value:
Cash equivalents	$ 893	$ 2,273
Other assets:
Life insurance policies	42,918	35,770
Total assets measured at fair value	43,811	38,043
Other current liabilities measured at fair value:
Contingent consideration	11,794	2,328
Other long-term liabilities measured at fair value:
Contingent consideration	25,450
Total liabilities measured at fair value	37,244	2,328
Level 1
Current assets measured at fair value:
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	0
Other long-term liabilities measured at fair value:
Contingent consideration	0
Total liabilities measured at fair value	0	0
Level 2
Current assets measured at fair value:
Cash equivalents	893	2,273
Other assets:
Life insurance policies	42,918	35,770
Total assets measured at fair value	43,811	38,043
Other current liabilities measured at fair value:
Contingent consideration	0	0
Other long-term liabilities measured at fair value:
Contingent consideration	0
Total liabilities measured at fair value	0	0
Level 3
Current assets measured at fair value:
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	11,794	2,328
Other long-term liabilities measured at fair value:
Contingent consideration	25,450
Total liabilities measured at fair value	$ 37,244	$ 2,328