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RESTRICTED CASH AND INVESTMENTS (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 26, 2021 | Dec. 27, 2020 | Dec. 29, 2019
Restricted Cash and Investments [Line Items] |  |  |
Cash collateral held by insurance carriers | $ 28,957 | $ 26,025 |
Cash and cash equivalents held in Trust | 21,590 | 29,410 |
Investments held in Trust | 135,419 | 152,247 |
Deferred compensation investments | 0 | 5,915 |
Company-owned life insurance policies | 32,318 | 26,267 |
Other restricted cash and cash equivalents | 2,742 | 670 |
Total restricted cash and investments | 221,026 | 240,534 |
Amortized cost | 135,419 | 152,247 |
Gross unrealized gain | 3,228 | 6,090 |
Gross unrealized losses | (563) | (41) |
Fair value | 138,084 | 158,296 |
Amortized cost |  |  |
Total held-to-maturity investments | 135,419 | 152,247 |
Fair value |  |  |
Total held-to-maturity investments | 138,084 | 158,296 |
Unrealized gains (losses) | 1,061 | 723 | $ 2,814
Municipal debt securities |  |  |
Restricted Cash and Investments [Line Items] |  |  |
Amortized cost | 56,346 | 67,287 |
Gross unrealized gain | 2,159 | 3,436 |
Gross unrealized losses | 0 | 0 |
Fair value | 58,505 | 70,723 |
Amortized cost |  |  |
Total held-to-maturity investments | 56,346 | 67,287 |
Fair value |  |  |
Total held-to-maturity investments | 58,505 | 70,723 |
Corporate debt securities |  |  |
Restricted Cash and Investments [Line Items] |  |  |
Amortized cost | 77,925 | 83,467 |
Gross unrealized gain | 995 | 2,511 |
Gross unrealized losses | (563) | (41) |
Fair value | 78,357 | 85,937 |
Amortized cost |  |  |
Total held-to-maturity investments | 77,925 | 83,467 |
Fair value |  |  |
Total held-to-maturity investments | 78,357 | 85,937 |
Agency mortgage-backed securities |  |  |
Restricted Cash and Investments [Line Items] |  |  |
Amortized cost | 148 | 493 |
Gross unrealized gain | 4 | 19 |
Gross unrealized losses | 0 | 0 |
Fair value | 152 | 512 |
Amortized cost |  |  |
Total held-to-maturity investments | 148 | 493 |
Fair value |  |  |
Total held-to-maturity investments | 152 | 512 |
U.S. government and agency securities |  |  |
Restricted Cash and Investments [Line Items] |  |  |
Amortized cost | 1,000 | 1,000 |
Gross unrealized gain | 70 | 124 |
Gross unrealized losses | 0 | 0 |
Fair value | 1,070 | 1,124 |
Amortized cost |  |  |
Total held-to-maturity investments | 1,000 | 1,000 |
Fair value |  |  |
Total held-to-maturity investments | 1,070 | $ 1,124 |
Restricted Cash and Investments |  |  |
Restricted Cash and Investments [Line Items] |  |  |
Amortized cost | 135,419 |  |
Fair value | 138,084 |  |
Amortized cost |  |  |
Due in one year or less | 23,828 |  |
Due after one year through five years | 109,572 |  |
Due after five years through ten years | 2,019 |  |
Total held-to-maturity investments | 135,419 |  |
Fair value |  |  |
Due in one year or less | 24,023 |  |
Due after one year through five years | 112,010 |  |
Due after five years through ten years | 2,051 |  |
Total held-to-maturity investments | $ 138,084 |  |

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