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FAIR VALUE - Asset Measured at Fair Value (Details) - USD ($) $ in Thousands | Dec. 26, 2020 | Dec. 28, 2019
--- | --- | ---
Money market funds | Cash and Cash Equivalents |  |
Fair Value |  |
Investments at fair value | $ 100 |
Money market funds | Restricted Investments |  |
Fair Value |  |
Investments at fair value | 4,600 |
Fixed Income | Restricted Investments |  |
Fair Value |  |
Investments at fair value | 16,500 |
Mutual funds, equity and alternative investments | Investments |  |
Fair Value |  |
Investments at fair value | 24,200 |
Money market and mutual funds | Other Assets |  |
Fair Value |  |
Investments at fair value | 600 |
Ardellis Insurance Ltd. |  |
Fair Value |  |
Total Fair Value | 40,777 | $ 34,256
Estimate of Fair Value Measurement | Recurring |  |
Fair Value |  |
Investments at fair value | 46,045 | 198,519
Assets at fair value | 46,045 | 198,519
Estimate of Fair Value Measurement | Recurring | Money market funds |  |
Fair Value |  |
Investments at fair value | 4,662 | 163,188
Estimate of Fair Value Measurement | Recurring | Fixed Income |  |
Fair Value |  |
Investments at fair value | 16,470 | 15,729
Estimate of Fair Value Measurement | Recurring | Equity |  |
Fair Value |  |
Investments at fair value | 12,602 | 9,734
Estimate of Fair Value Measurement | Recurring | Alternative Investments |  |
Fair Value |  |
Investments at fair value | 2,040 | 1,941
Estimate of Fair Value Measurement | Recurring | Mutual Fund |  |
Fair Value |  |
Investments at fair value | 10,271 | 7,927
Estimate of Fair Value Measurement | Recurring | Domestic stock |  |
Fair Value |  |
Investments at fair value | 8,088 | 3,308
Estimate of Fair Value Measurement | Recurring | International stock funds |  |
Fair Value |  |
Investments at fair value | 1,440 | 1,741
Estimate of Fair Value Measurement | Recurring | Target funds |  |
Fair Value |  |
Investments at fair value | 114 | 281
Estimate of Fair Value Measurement | Recurring | Bond funds |  |
Fair Value |  |
Investments at fair value | 147 | 850
Estimate of Fair Value Measurement | Recurring | Alternative funds |  |
Fair Value |  |
Investments at fair value | 482 | 1,747
Estimate of Fair Value Measurement | Recurring | Quoted Prices in Active Markets (Level 1) |  |
Fair Value |  |
Investments at fair value | 23,138 | 180,521
Assets at fair value | 23,138 | 180,521
Estimate of Fair Value Measurement | Recurring | Quoted Prices in Active Markets (Level 1) | Money market funds |  |
Fair Value |  |
Investments at fair value | 19 | 162,626
Estimate of Fair Value Measurement | Recurring | Quoted Prices in Active Markets (Level 1) | Fixed Income |  |
Fair Value |  |
Investments at fair value | 246 | 234
Estimate of Fair Value Measurement | Recurring | Quoted Prices in Active Markets (Level 1) | Equity |  |
Fair Value |  |
Investments at fair value | 12,602 | 9,734
Estimate of Fair Value Measurement | Recurring | Quoted Prices in Active Markets (Level 1) | Mutual Fund |  |
Fair Value |  |
Investments at fair value | 10,271 | 7,927
Estimate of Fair Value Measurement | Recurring | Quoted Prices in Active Markets (Level 1) | Domestic stock |  |
Fair Value |  |
Investments at fair value | 8,088 | 3,308
Estimate of Fair Value Measurement | Recurring | Quoted Prices in Active Markets (Level 1) | International stock funds |  |
Fair Value |  |
Investments at fair value | 1,440 | 1,741
Estimate of Fair Value Measurement | Recurring | Quoted Prices in Active Markets (Level 1) | Target funds |  |
Fair Value |  |
Investments at fair value | 114 | 281
Estimate of Fair Value Measurement | Recurring | Quoted Prices in Active Markets (Level 1) | Bond funds |  |
Fair Value |  |
Investments at fair value | 147 | 850
Estimate of Fair Value Measurement | Recurring | Quoted Prices in Active Markets (Level 1) | Alternative funds |  |
Fair Value |  |
Investments at fair value | 482 | 1,747
Estimate of Fair Value Measurement | Recurring | Prices with Other Observable Inputs (Level 2) |  |
Fair Value |  |
Investments at fair value | 20,867 | 16,057
Assets at fair value | 20,867 | 16,057
Estimate of Fair Value Measurement | Recurring | Prices with Other Observable Inputs (Level 2) | Money market funds |  |
Fair Value |  |
Investments at fair value | 4,643 | 562
Estimate of Fair Value Measurement | Recurring | Prices with Other Observable Inputs (Level 2) | Fixed Income |  |
Fair Value |  |
Investments at fair value | 16,224 | 15,495
Estimate of Fair Value Measurement | Recurring | Prices with Unobservable Inputs (Level 3) |  |
Fair Value |  |
Investments at fair value | 2,040 | 1,941
Assets at fair value | 2,040 | 1,941
Estimate of Fair Value Measurement | Recurring | Prices with Unobservable Inputs (Level 3) | Alternative Investments |  |
Fair Value |  |
Investments at fair value | $ 2,040 | $ 1,941

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