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FAIR VALUE - Asset Measured at Fair Value (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 29, 2025	Mar. 30, 2024	Dec. 28, 2024
Fair Value
Purchase of investments	$ 7,191	$ 9,352
Fixed Income | Restricted Investments
Fair Value
Investments at fair value	39,600		$ 38,700
Money market funds | Cash and Cash Equivalents
Fair Value
Investments at fair value	117,500		377,400
Money market funds | Restricted Investments
Fair Value
Investments at fair value	2,400		400
Mutual funds, equity and alternative investments | Investments
Fair Value
Investments at fair value	30,600		31,000
Mutual funds, equity and alternative investments | Other Assets
Fair Value
Investments at fair value	28,500		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	28,500
Ardellis Insurance Ltd.
Fair Value
Total Fair Value	70,315		69,780
Estimate of Fair Value Measurement | Recurring
Fair Value
Investments at fair value	218,799		473,685
Estimate of Fair Value Measurement | Recurring | Fixed Income
Fair Value
Investments at fair value	39,246		38,348
Estimate of Fair Value Measurement | Recurring | Money market funds
Fair Value
Investments at fair value	119,928		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	44,819		42,431
Estimate of Fair Value Measurement | Recurring | Alternative Investments
Fair Value
Investments at fair value	4,034		4,044
Estimate of Fair Value Measurement | Recurring | Mutual funds
Fair Value
Investments at fair value	10,428		10,668
Estimate of Fair Value Measurement | Recurring | Domestic stock
Fair Value
Investments at fair value	9,267		9,534
Estimate of Fair Value Measurement | Recurring | International stock funds
Fair Value
Investments at fair value	665		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	480		477
Estimate of Fair Value Measurement | Recurring | Quoted Prices in Active Markets (Level 1)
Fair Value
Investments at fair value	112,847		389,415
Estimate of Fair Value Measurement | Recurring | Quoted Prices in Active Markets (Level 1) | Fixed Income
Fair Value
Investments at fair value	5,256		5,272
Estimate of Fair Value Measurement | Recurring | Quoted Prices in Active Markets (Level 1) | Money market funds
Fair Value
Investments at fair value	80,500		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	16,319		16,431
Estimate of Fair Value Measurement | Recurring | Quoted Prices in Active Markets (Level 1) | Mutual funds
Fair Value
Investments at fair value	10,428		10,668
Estimate of Fair Value Measurement | Recurring | Quoted Prices in Active Markets (Level 1) | Domestic stock
Fair Value
Investments at fair value	9,267		9,534
Estimate of Fair Value Measurement | Recurring | Quoted Prices in Active Markets (Level 1) | International stock funds
Fair Value
Investments at fair value	665		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	480		477
Estimate of Fair Value Measurement | Recurring | Prices with Other Observable Inputs (Level 2)
Fair Value
Investments at fair value	73,418		54,226
Estimate of Fair Value Measurement | Recurring | Prices with Other Observable Inputs (Level 2) | Fixed Income
Fair Value
Investments at fair value	33,990		33,076
Estimate of Fair Value Measurement | Recurring | Prices with Other Observable Inputs (Level 2) | Money market funds
Fair Value
Investments at fair value	39,428		21,150
Estimate of Fair Value Measurement | Recurring | Prices with Unobservable Inputs (Level 3)
Fair Value
Investments at fair value	32,534		30,044
Estimate of Fair Value Measurement | Recurring | Prices with Unobservable Inputs (Level 3) | Equity
Fair Value
Investments at fair value	28,500		26,000
Estimate of Fair Value Measurement | Recurring | Prices with Unobservable Inputs (Level 3) | Alternative Investments
Fair Value
Investments at fair value	$ 4,034		$ 4,044

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