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RESTRICTED CASH AND INVESTMENTS (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 28, 2021 | Mar. 29, 2020 | Dec. 27, 2020
Restricted Cash and Investments [Line Items] |  |  |
Cash collateral held by insurance carriers | $ 26,745 |  | $ 26,025
Cash and cash equivalents held in Trust | 25,586 |  | 29,410
Investments held in Trust | 145,244 |  | 152,247
Deferred compensation investments | 5,821 |  | 5,915
Company owned life insurance policies | 26,950 |  | 26,267
Other restricted cash and cash equivalents | 832 |  | 670
Restricted cash and investments | 231,178 |  | 240,534
Held-to-maturity Securities, Reconciliation to Fair Value [Abstract] |  |  |
Amortized cost of held-to-maturity investments | 145,244 |  | 152,247
Gross unrealized gains | 4,968 |  | 6,090
Gross unrealized losses | (276) |  | (41)
Fair value | 149,936 |  | 158,296
Held-to-maturity securities, amortized cost [Abstract] |  |  |
Amortized cost of held-to-maturity investments | 145,244 |  | 152,247
Held-to-maturity securities, fair value [Abstract] |  |  |
Fair value | 149,936 |  | 158,296
Unrealized gains (losses) on Investments | (877) | $ (4,841) |
Municipal debt securities |  |  |
Held-to-maturity Securities, Reconciliation to Fair Value [Abstract] |  |  |
Amortized cost of held-to-maturity investments | 65,840 |  | 67,287
Gross unrealized gains | 2,880 |  | 3,436
Gross unrealized losses | 0 |  | 0
Fair value | 68,720 |  | 70,723
Held-to-maturity securities, amortized cost [Abstract] |  |  |
Amortized cost of held-to-maturity investments | 65,840 |  | 67,287
Held-to-maturity securities, fair value [Abstract] |  |  |
Fair value | 68,720 |  | 70,723
Corporate debt securities |  |  |
Held-to-maturity Securities, Reconciliation to Fair Value [Abstract] |  |  |
Amortized cost of held-to-maturity investments | 78,056 |  | 83,467
Gross unrealized gains | 1,974 |  | 2,511
Gross unrealized losses | (276) |  | (41)
Fair value | 79,754 |  | 85,937
Held-to-maturity securities, amortized cost [Abstract] |  |  |
Amortized cost of held-to-maturity investments | 78,056 |  | 83,467
Held-to-maturity securities, fair value [Abstract] |  |  |
Fair value | 79,754 |  | 85,937
Agency mortgage-backed securities |  |  |
Held-to-maturity Securities, Reconciliation to Fair Value [Abstract] |  |  |
Amortized cost of held-to-maturity investments | 351 |  | 493
Gross unrealized gains | 14 |  | 19
Gross unrealized losses | 0 |  | 0
Fair value | 365 |  | 512
Held-to-maturity securities, amortized cost [Abstract] |  |  |
Amortized cost of held-to-maturity investments | 351 |  | 493
Held-to-maturity securities, fair value [Abstract] |  |  |
Fair value | 365 |  | 512
U.S. government and agency securities |  |  |
Held-to-maturity Securities, Reconciliation to Fair Value [Abstract] |  |  |
Amortized cost of held-to-maturity investments | 997 |  | 1,000
Gross unrealized gains | 100 |  | 124
Gross unrealized losses | 0 |  | 0
Fair value | 1,097 |  | 1,124
Held-to-maturity securities, amortized cost [Abstract] |  |  |
Amortized cost of held-to-maturity investments | 997 |  | 1,000
Held-to-maturity securities, fair value [Abstract] |  |  |
Fair value | 1,097 |  | $ 1,124
Restricted cash and investments |  |  |
Held-to-maturity Securities, Reconciliation to Fair Value [Abstract] |  |  |
Amortized cost of held-to-maturity investments | 145,244 |  |
Fair value | 149,936 |  |
Held-to-maturity securities, amortized cost [Abstract] |  |  |
Due in one year or less | 22,519 |  |
Due after one year through five years | 109,541 |  |
Due after five years through ten years | 13,184 |  |
Amortized cost of held-to-maturity investments | 145,244 |  |
Held-to-maturity securities, fair value [Abstract] |  |  |
Due in one year or less | 22,675 |  |
Due after one year through five years | 113,285 |  |
Due after five years through ten years | 13,976 |  |
Fair value | $ 149,936 |  |

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