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RESTRICTED CASH AND INVESTMENTS (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 26, 2022 | Jun. 27, 2021 | Jun. 26, 2022 | Jun. 27, 2021 | Dec. 26, 2021
Restricted Cash and Investments [Line Items] |  |  |  |  |
Cash collateral held by insurance carriers | $ 29,179 |  | $ 29,179 |  | $ 28,957
Cash and cash equivalents held in Trust | 27,745 |  | 27,745 |  | 21,590
Investments held in Trust | 121,447 |  | 121,447 |  | 135,419
Company owned life insurance policies | 26,759 |  | 26,759 |  | 32,318
Other restricted cash and cash equivalents | 639 |  | 639 |  | 2,742
Restricted cash and investments | 205,769 |  | 205,769 |  | 221,026
Held-to-maturity Securities, Reconciliation to Fair Value [Abstract] |  |  |  |  |
Amortized cost of held-to-maturity investments | 121,447 |  | 121,447 |  | 135,419
Gross unrealized gains | 153 |  | 153 |  | 3,228
Gross unrealized losses | (3,335) |  | (3,335) |  | (563)
Fair value | 118,265 |  | 118,265 |  | 138,084
Held-to-maturity securities, amortized cost [Abstract] |  |  |  |  |
Amortized cost of held-to-maturity investments | 121,447 |  | 121,447 |  | 135,419
Held-to-maturity securities, fair value [Abstract] |  |  |  |  |
Fair value | 118,265 |  | 118,265 |  | 138,084
Unrealized gains (losses) on Investments | (3,549) | $ (1,549) | 5,560 | $ 2,426 |
Municipal debt securities |  |  |  |  |
Held-to-maturity Securities, Reconciliation to Fair Value [Abstract] |  |  |  |  |
Amortized cost of held-to-maturity investments | 52,362 |  | 52,362 |  | 56,346
Gross unrealized gains | 141 |  | 141 |  | 2,159
Gross unrealized losses | (237) |  | (237) |  | 0
Fair value | 52,266 |  | 52,266 |  | 58,505
Held-to-maturity securities, amortized cost [Abstract] |  |  |  |  |
Amortized cost of held-to-maturity investments | 52,362 |  | 52,362 |  | 56,346
Held-to-maturity securities, fair value [Abstract] |  |  |  |  |
Fair value | 52,266 |  | 52,266 |  | 58,505
Corporate debt securities |  |  |  |  |
Held-to-maturity Securities, Reconciliation to Fair Value [Abstract] |  |  |  |  |
Amortized cost of held-to-maturity investments | 67,999 |  | 67,999 |  | 77,925
Gross unrealized gains | 12 |  | 12 |  | 995
Gross unrealized losses | (3,083) |  | (3,083) |  | (563)
Fair value | 64,928 |  | 64,928 |  | 78,357
Held-to-maturity securities, amortized cost [Abstract] |  |  |  |  |
Amortized cost of held-to-maturity investments | 67,999 |  | 67,999 |  | 77,925
Held-to-maturity securities, fair value [Abstract] |  |  |  |  |
Fair value | 64,928 |  | 64,928 |  | 78,357
Agency mortgage-backed securities |  |  |  |  |
Held-to-maturity Securities, Reconciliation to Fair Value [Abstract] |  |  |  |  |
Amortized cost of held-to-maturity investments | 86 |  | 86 |  | 148
Gross unrealized gains | 0 |  | 0 |  | 4
Gross unrealized losses | (1) |  | (1) |  | 0
Fair value | 85 |  | 85 |  | 152
Held-to-maturity securities, amortized cost [Abstract] |  |  |  |  |
Amortized cost of held-to-maturity investments | 86 |  | 86 |  | 148
Held-to-maturity securities, fair value [Abstract] |  |  |  |  |
Fair value | 85 |  | 85 |  | 152
U.S. government and agency securities |  |  |  |  |
Held-to-maturity Securities, Reconciliation to Fair Value [Abstract] |  |  |  |  |
Amortized cost of held-to-maturity investments | 1,000 |  | 1,000 |  | 1,000
Gross unrealized gains | 0 |  | 0 |  | 70
Gross unrealized losses | (14) |  | (14) |  | 0
Fair value | 986 |  | 986 |  | 1,070
Held-to-maturity securities, amortized cost [Abstract] |  |  |  |  |
Amortized cost of held-to-maturity investments | 1,000 |  | 1,000 |  | 1,000
Held-to-maturity securities, fair value [Abstract] |  |  |  |  |
Fair value | 986 |  | 986 |  | $ 1,070
Restricted cash and investments |  |  |  |  |
Held-to-maturity Securities, Reconciliation to Fair Value [Abstract] |  |  |  |  |
Amortized cost of held-to-maturity investments | 121,447 |  | 121,447 |  |
Fair value | 118,265 |  | 118,265 |  |
Held-to-maturity securities, amortized cost [Abstract] |  |  |  |  |
Due in one year or less | 22,399 |  | 22,399 |  |
Due after one year through five years | 99,048 |  | 99,048 |  |
Amortized cost of held-to-maturity investments | 121,447 |  | 121,447 |  |
Held-to-maturity securities, fair value [Abstract] |  |  |  |  |
Due in one year or less | 22,381 |  | 22,381 |  |
Due after one year through five years | 95,884 |  | 95,884 |  |
Fair value | $ 118,265 |  | $ 118,265 |  |

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