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FAIR VALUE - Asset Measured at Fair Value (Details) - USD ($) $ in Thousands	Jun. 29, 2024	Dec. 30, 2023
Fixed Income | Restricted Investment
Fair Value
Investments at fair value	$ 30,000	$ 24,400
Money market funds | Cash and Cash Equivalents
Fair Value
Investments at fair value	261,400	498,500
Money market funds | Restricted Investment
Fair Value
Investments at fair value	300	400
Mutual funds, equity and alternative investments | Investments
Fair Value
Investments at fair value	36,700	34,800
Mutual funds, equity and alternative investments | Other Non current Assets
Fair Value
Investments at fair value	22,000	10,500
Money market and mutual funds | Other Non current Assets
Fair Value
Investments at fair value	100	100
Ardellis Insurance Ltd.
Fair Value
Total Fair Value	66,691	59,177
Estimate of Fair Value Measurement | Recurring
Fair Value
Investments at fair value	350,467	568,655
Estimate of Fair Value Measurement | Recurring | Fixed Income
Fair Value
Investments at fair value	29,607	24,088
Estimate of Fair Value Measurement | Recurring | Money market funds
Fair Value
Investments at fair value	261,727	498,933
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	39,279	26,911
Estimate of Fair Value Measurement | Recurring | Alternative Investments
Fair Value
Investments at fair value	4,054	4,052
Estimate of Fair Value Measurement | Recurring | Mutual Fund
Fair Value
Investments at fair value	15,456	14,327
Estimate of Fair Value Measurement | Recurring | Domestic stock
Fair Value
Investments at fair value	14,406	13,330
Estimate of Fair Value Measurement | Recurring | International stock funds
Fair Value
Investments at fair value	550	509
Estimate of Fair Value Measurement | Recurring | Target funds
Fair Value
Investments at fair value	9	9
Estimate of Fair Value Measurement | Recurring | Bond funds
Fair Value
Investments at fair value	5	5
Estimate of Fair Value Measurement | Recurring | Alternative funds
Fair Value
Investments at fair value	486	474
Estimate of Fair Value Measurement | Recurring | Quoted Prices in Active Markets (Level 1)
Fair Value
Investments at fair value	288,984	528,994
Estimate of Fair Value Measurement | Recurring | Quoted Prices in Active Markets (Level 1) | Fixed Income
Fair Value
Investments at fair value	5,130	5,112
Estimate of Fair Value Measurement | Recurring | Quoted Prices in Active Markets (Level 1) | Money market funds
Fair Value
Investments at fair value	250,775	492,800
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	17,279	16,411
Estimate of Fair Value Measurement | Recurring | Quoted Prices in Active Markets (Level 1) | Mutual Fund
Fair Value
Investments at fair value	15,456	14,327
Estimate of Fair Value Measurement | Recurring | Quoted Prices in Active Markets (Level 1) | Domestic stock
Fair Value
Investments at fair value	14,406	13,330
Estimate of Fair Value Measurement | Recurring | Quoted Prices in Active Markets (Level 1) | International stock funds
Fair Value
Investments at fair value	550	509
Estimate of Fair Value Measurement | Recurring | Quoted Prices in Active Markets (Level 1) | Target funds
Fair Value
Investments at fair value	9	9
Estimate of Fair Value Measurement | Recurring | Quoted Prices in Active Markets (Level 1) | Bond funds
Fair Value
Investments at fair value	5	5
Estimate of Fair Value Measurement | Recurring | Quoted Prices in Active Markets (Level 1) | Alternative funds
Fair Value
Investments at fair value	486	474
Estimate of Fair Value Measurement | Recurring | Prices with Other Observable Inputs (Level 2)
Fair Value
Investments at fair value	35,429	25,109
Estimate of Fair Value Measurement | Recurring | Prices with Other Observable Inputs (Level 2) | Fixed Income
Fair Value
Investments at fair value	24,477	18,976
Estimate of Fair Value Measurement | Recurring | Prices with Other Observable Inputs (Level 2) | Money market funds
Fair Value
Investments at fair value	10,952	6,133
Estimate of Fair Value Measurement | Recurring | Prices with Unobservable Inputs (Level 3)
Fair Value
Investments at fair value	26,054	14,552
Estimate of Fair Value Measurement | Recurring | Prices with Unobservable Inputs (Level 3) | Equity
Fair Value
Investments at fair value	22,000	10,500
Estimate of Fair Value Measurement | Recurring | Prices with Unobservable Inputs (Level 3) | Alternative Investments
Fair Value
Investments at fair value	$ 4,054	$ 4,052

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