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FAIR VALUE - Asset Measured at Fair Value (Details) - USD ($) $ in Thousands	Jun. 28, 2025	Dec. 28, 2024
Fixed Income | Restricted Investments
Fair Value
Investments at fair value	$ 42,000	$ 38,700
Money market funds | Cash and Cash Equivalents
Fair Value
Investments at fair value	154,100	377,400
Money market funds | Restricted Investments
Fair Value
Investments at fair value	2,300	400
Mutual funds, equity and alternative investments | Investments
Fair Value
Investments at fair value	31,900	31,000
Mutual funds, equity and alternative investments | Other Assets
Fair Value
Investments at fair value	30,500	26,000
Money market and mutual funds | Other Assets
Fair Value
Investments at fair value	200	200
Prices with Unobservable Inputs (Level 3) | Equity | Other Assets
Fair Value
Investments at fair value	30,500
Ardellis Insurance Ltd.
Fair Value
Total Fair Value	74,008	69,780
Estimate of Fair Value Measurement | Recurring
Fair Value
Investments at fair value	260,990	473,685
Estimate of Fair Value Measurement | Recurring | Fixed Income
Fair Value
Investments at fair value	41,643	38,348
Estimate of Fair Value Measurement | Recurring | Money market funds
Fair Value
Investments at fair value	156,426	377,850
Estimate of Fair Value Measurement | Recurring | Treasury Securities
Fair Value
Investments at fair value	344	344
Estimate of Fair Value Measurement | Recurring | Equity
Fair Value
Investments at fair value	47,440	42,431
Estimate of Fair Value Measurement | Recurring | Alternative Investments
Fair Value
Investments at fair value	4,064	4,044
Estimate of Fair Value Measurement | Recurring | Mutual funds
Fair Value
Investments at fair value	11,073	10,668
Estimate of Fair Value Measurement | Recurring | Domestic stock
Fair Value
Investments at fair value	9,838	9,534
Estimate of Fair Value Measurement | Recurring | International stock funds
Fair Value
Investments at fair value	742	641
Estimate of Fair Value Measurement | Recurring | Target funds
Fair Value
Investments at fair value	10	10
Estimate of Fair Value Measurement | Recurring | Bond funds
Fair Value
Investments at fair value	6	6
Estimate of Fair Value Measurement | Recurring | Alternative funds
Fair Value
Investments at fair value	477	477
Estimate of Fair Value Measurement | Recurring | Quoted Prices in Active Markets (Level 1)
Fair Value
Investments at fair value	162,455	389,415
Estimate of Fair Value Measurement | Recurring | Quoted Prices in Active Markets (Level 1) | Fixed Income
Fair Value
Investments at fair value	5,287	5,272
Estimate of Fair Value Measurement | Recurring | Quoted Prices in Active Markets (Level 1) | Money market funds
Fair Value
Investments at fair value	128,811	356,700
Estimate of Fair Value Measurement | Recurring | Quoted Prices in Active Markets (Level 1) | Treasury Securities
Fair Value
Investments at fair value	344	344
Estimate of Fair Value Measurement | Recurring | Quoted Prices in Active Markets (Level 1) | Equity
Fair Value
Investments at fair value	16,940	16,431
Estimate of Fair Value Measurement | Recurring | Quoted Prices in Active Markets (Level 1) | Mutual funds
Fair Value
Investments at fair value	11,073	10,668
Estimate of Fair Value Measurement | Recurring | Quoted Prices in Active Markets (Level 1) | Domestic stock
Fair Value
Investments at fair value	9,838	9,534
Estimate of Fair Value Measurement | Recurring | Quoted Prices in Active Markets (Level 1) | International stock funds
Fair Value
Investments at fair value	742	641
Estimate of Fair Value Measurement | Recurring | Quoted Prices in Active Markets (Level 1) | Target funds
Fair Value
Investments at fair value	10	10
Estimate of Fair Value Measurement | Recurring | Quoted Prices in Active Markets (Level 1) | Bond funds
Fair Value
Investments at fair value	6	6
Estimate of Fair Value Measurement | Recurring | Quoted Prices in Active Markets (Level 1) | Alternative funds
Fair Value
Investments at fair value	477	477
Estimate of Fair Value Measurement | Recurring | Prices with Other Observable Inputs (Level 2)
Fair Value
Investments at fair value	63,971	54,226
Estimate of Fair Value Measurement | Recurring | Prices with Other Observable Inputs (Level 2) | Fixed Income
Fair Value
Investments at fair value	36,356	33,076
Estimate of Fair Value Measurement | Recurring | Prices with Other Observable Inputs (Level 2) | Money market funds
Fair Value
Investments at fair value	27,615	21,150
Estimate of Fair Value Measurement | Recurring | Prices with Unobservable Inputs (Level 3)
Fair Value
Investments at fair value	34,564	30,044
Estimate of Fair Value Measurement | Recurring | Prices with Unobservable Inputs (Level 3) | Equity
Fair Value
Investments at fair value	30,500	26,000
Estimate of Fair Value Measurement | Recurring | Prices with Unobservable Inputs (Level 3) | Alternative Investments
Fair Value
Investments at fair value	$ 4,064	$ 4,044

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