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FAIR VALUE - Asset Measured at Fair Value (Details) - USD ($) $ in Thousands	Sep. 27, 2025	Dec. 28, 2024
Money market funds | Cash and Cash Equivalents
Fair Value
Investments at fair value	$ 294,100	$ 377,400
Money market funds | Restricted Investments
Fair Value
Investments at fair value	2,000	400
Fixed income funds | Restricted Investments
Fair Value
Investments at fair value	46,500	38,700
Equity securities | Other Assets
Fair Value
Investments at fair value	30,500	26,000
Mutual funds, equity and alternative investments | Investments
Fair Value
Investments at fair value	33,800	31,000
Money market and mutual funds | Other Assets
Fair Value
Investments at fair value	200	200
Prices with Unobservable Inputs (Level 3) | Equity securities | Other Assets
Fair Value
Investments at fair value	30,500
Ardellis Insurance Ltd.
Fair Value
Total Fair Value	80,474	69,780
Estimate of Fair Value Measurement | Recurring
Fair Value
Investments at fair value	407,092	473,685
Estimate of Fair Value Measurement | Recurring | Money market funds
Fair Value
Investments at fair value	296,058	377,850
Estimate of Fair Value Measurement | Recurring | Fixed income funds
Fair Value
Investments at fair value	46,202	38,348
Estimate of Fair Value Measurement | Recurring | Treasury securities
Fair Value
Investments at fair value	345	344
Estimate of Fair Value Measurement | Recurring | Equity securities
Fair Value
Investments at fair value	48,488	42,431
Estimate of Fair Value Measurement | Recurring | Alternative investments
Fair Value
Investments at fair value	4,102	4,044
Estimate of Fair Value Measurement | Recurring | Mutual funds
Fair Value
Investments at fair value	11,897	10,668
Estimate of Fair Value Measurement | Recurring | Domestic stock funds
Fair Value
Investments at fair value	10,592	9,534
Estimate of Fair Value Measurement | Recurring | International stock funds
Fair Value
Investments at fair value	796	641
Estimate of Fair Value Measurement | Recurring | Target funds
Fair Value
Investments at fair value	11	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	492	477
Estimate of Fair Value Measurement | Recurring | Quoted Prices in Active Markets (Level 1)
Fair Value
Investments at fair value	304,117	389,415
Estimate of Fair Value Measurement | Recurring | Quoted Prices in Active Markets (Level 1) | Money market funds
Fair Value
Investments at fair value	268,544	356,700
Estimate of Fair Value Measurement | Recurring | Quoted Prices in Active Markets (Level 1) | Fixed income funds
Fair Value
Investments at fair value	5,343	5,272
Estimate of Fair Value Measurement | Recurring | Quoted Prices in Active Markets (Level 1) | Treasury securities
Fair Value
Investments at fair value	345	344
Estimate of Fair Value Measurement | Recurring | Quoted Prices in Active Markets (Level 1) | Equity securities
Fair Value
Investments at fair value	17,988	16,431
Estimate of Fair Value Measurement | Recurring | Quoted Prices in Active Markets (Level 1) | Mutual funds
Fair Value
Investments at fair value	11,897	10,668
Estimate of Fair Value Measurement | Recurring | Quoted Prices in Active Markets (Level 1) | Domestic stock funds
Fair Value
Investments at fair value	10,592	9,534
Estimate of Fair Value Measurement | Recurring | Quoted Prices in Active Markets (Level 1) | International stock funds
Fair Value
Investments at fair value	796	641
Estimate of Fair Value Measurement | Recurring | Quoted Prices in Active Markets (Level 1) | Target funds
Fair Value
Investments at fair value	11	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	492	477
Estimate of Fair Value Measurement | Recurring | Prices with Other Observable Inputs (Level 2)
Fair Value
Investments at fair value	68,373	54,226
Estimate of Fair Value Measurement | Recurring | Prices with Other Observable Inputs (Level 2) | Money market funds
Fair Value
Investments at fair value	27,514	21,150
Estimate of Fair Value Measurement | Recurring | Prices with Other Observable Inputs (Level 2) | Fixed income funds
Fair Value
Investments at fair value	40,859	33,076
Estimate of Fair Value Measurement | Recurring | Prices with Unobservable Inputs (Level 3)
Fair Value
Investments at fair value	34,602	30,044
Estimate of Fair Value Measurement | Recurring | Prices with Unobservable Inputs (Level 3) | Equity securities
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	$ 4,102	$ 4,044

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