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RESTRICTED CASH AND INVESTMENTS (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 29, 2024 | Sep. 24, 2023 | Sep. 29, 2024 | Sep. 24, 2023 | Dec. 31, 2023
Restricted Cash and Investments [Line Items] |  |  |  |  |
Cash collateral held by insurance carriers | $ 22,215 |  | $ 22,215 |  | $ 23,598
Cash and cash equivalents held in Trust | 12,187 |  | 12,187 |  | 12,703
Investments held in Trust | 103,627 |  | 103,627 |  | 122,659
Company owned life insurance policies | 41,726 |  | 41,726 |  | 32,905
Other restricted cash and cash equivalents | 369 |  | 369 |  | 1,120
Restricted cash and investments | 180,124 |  | 180,124 |  | 192,985
Held-to-maturity Securities, Reconciliation to Fair Value [Abstract] |  |  |  |  |
Amortized cost of held-to-maturity investments | 103,627 |  | 103,627 |  | 122,659
Gross unrealized gains | 1,097 |  | 1,097 |  | 533
Gross unrealized losses | (964) |  | (964) |  | (2,279)
Fair value | 103,760 |  | 103,760 |  | 120,913
Held-to-maturity securities, amortized cost [Abstract] |  |  |  |  |
Amortized cost of held-to-maturity investments | 103,627 |  | 103,627 |  | 122,659
Held-to-maturity securities, fair value [Abstract] |  |  |  |  |
Fair value | 103,760 |  | 103,760 |  | 120,913
Unrealized gains (losses) on Investments | 2,099 | $ (493) | 4,821 | $ 1,482 |
Municipal debt securities |  |  |  |  |
Held-to-maturity Securities, Reconciliation to Fair Value [Abstract] |  |  |  |  |
Amortized cost of held-to-maturity investments | 23,632 |  | 23,632 |  | 32,042
Gross unrealized gains | 8 |  | 8 |  | 4
Gross unrealized losses | (94) |  | (94) |  | (242)
Fair value | 23,546 |  | 23,546 |  | 31,804
Held-to-maturity securities, amortized cost [Abstract] |  |  |  |  |
Amortized cost of held-to-maturity investments | 23,632 |  | 23,632 |  | 32,042
Held-to-maturity securities, fair value [Abstract] |  |  |  |  |
Fair value | 23,546 |  | 23,546 |  | 31,804
Corporate debt securities |  |  |  |  |
Held-to-maturity Securities, Reconciliation to Fair Value [Abstract] |  |  |  |  |
Amortized cost of held-to-maturity investments | 67,780 |  | 67,780 |  | 76,578
Gross unrealized gains | 810 |  | 810 |  | 333
Gross unrealized losses | (854) |  | (854) |  | (1,999)
Fair value | 67,736 |  | 67,736 |  | 74,912
Held-to-maturity securities, amortized cost [Abstract] |  |  |  |  |
Amortized cost of held-to-maturity investments | 67,780 |  | 67,780 |  | 76,578
Held-to-maturity securities, fair value [Abstract] |  |  |  |  |
Fair value | 67,736 |  | 67,736 |  | 74,912
Agency mortgage-backed securities |  |  |  |  |
Held-to-maturity Securities, Reconciliation to Fair Value [Abstract] |  |  |  |  |
Amortized cost of held-to-maturity investments | 11,216 |  | 11,216 |  | 13,039
Gross unrealized gains | 279 |  | 279 |  | 196
Gross unrealized losses | 0 |  | 0 |  | 0
Fair value | 11,495 |  | 11,495 |  | 13,235
Held-to-maturity securities, amortized cost [Abstract] |  |  |  |  |
Amortized cost of held-to-maturity investments | 11,216 |  | 11,216 |  | 13,039
Held-to-maturity securities, fair value [Abstract] |  |  |  |  |
Fair value | 11,495 |  | 11,495 |  | 13,235
U.S. government and agency securities |  |  |  |  |
Held-to-maturity Securities, Reconciliation to Fair Value [Abstract] |  |  |  |  |
Amortized cost of held-to-maturity investments | 999 |  | 999 |  | 1,000
Gross unrealized gains | 0 |  | 0 |  | 0
Gross unrealized losses | (16) |  | (16) |  | (38)
Fair value | 983 |  | 983 |  | 962
Held-to-maturity securities, amortized cost [Abstract] |  |  |  |  |
Amortized cost of held-to-maturity investments | 999 |  | 999 |  | 1,000
Held-to-maturity securities, fair value [Abstract] |  |  |  |  |
Fair value | 983 |  | 983 |  | $ 962
Restricted cash and investments |  |  |  |  |
Held-to-maturity Securities, Reconciliation to Fair Value [Abstract] |  |  |  |  |
Amortized cost of held-to-maturity investments | 103,627 |  | 103,627 |  |
Fair value | 103,760 |  | 103,760 |  |
Held-to-maturity securities, amortized cost [Abstract] |  |  |  |  |
Due in one year or less | 28,069 |  | 28,069 |  |
Due after one year through five years | 63,408 |  | 63,408 |  |
Due after five years through ten years | 6,212 |  | 6,212 |  |
Due after ten years | 5,938 |  | 5,938 |  |
Amortized cost of held-to-maturity investments | 103,627 |  | 103,627 |  |
Held-to-maturity securities, fair value [Abstract] |  |  |  |  |
Due in one year or less | 27,869 |  | 27,869 |  |
Due after one year through five years | 63,346 |  | 63,346 |  |
Due after five years through ten years | 6,415 |  | 6,415 |  |
Due after ten years | 6,130 |  | 6,130 |  |
Fair value | $ 103,760 |  | $ 103,760 |  |

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