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FAIR VALUE - Asset Measured at Fair Value (Details) - USD ($) $ in Thousands	Sep. 28, 2024	Dec. 30, 2023
Fixed Income | Restricted Investments
Fair Value
Investments at fair value	$ 31,700	$ 24,400
Money market funds | Cash and Cash Equivalents
Fair Value
Investments at fair value	413,600	498,500
Money market funds | Restricted Investments
Fair Value
Investments at fair value	900	400
Mutual funds, equity and alternative investments | Investments
Fair Value
Investments at fair value	38,900	34,800
Mutual funds, equity and alternative investments | Other Assets
Fair Value
Investments at fair value	22,000	10,500
Money market and mutual funds | Other Assets
Fair Value
Investments at fair value	100	100
Prices with Unobservable Inputs (Level 3) | Equity | Other Assets
Fair Value
Investments at fair value	22,000
Ardellis Insurance Ltd.
Fair Value
Total Fair Value	70,637	59,177
Estimate of Fair Value Measurement | Recurring
Fair Value
Investments at fair value	507,213	568,655
Estimate of Fair Value Measurement | Recurring | Fixed Income
Fair Value
Investments at fair value	31,358	24,088
Estimate of Fair Value Measurement | Recurring | Money market funds
Fair Value
Investments at fair value	414,523	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	38,893	26,911
Estimate of Fair Value Measurement | Recurring | Alternative Investments
Fair Value
Investments at fair value	4,033	4,052
Estimate of Fair Value Measurement | Recurring | Mutual funds
Fair Value
Investments at fair value	18,062	14,327
Estimate of Fair Value Measurement | Recurring | Domestic stock
Fair Value
Investments at fair value	16,860	13,330
Estimate of Fair Value Measurement | Recurring | International stock funds
Fair Value
Investments at fair value	704	509
Estimate of Fair Value Measurement | Recurring | Target funds
Fair Value
Investments at fair value	10	9
Estimate of Fair Value Measurement | Recurring | Bond funds
Fair Value
Investments at fair value	6	5
Estimate of Fair Value Measurement | Recurring | Alternative funds
Fair Value
Investments at fair value	482	474
Estimate of Fair Value Measurement | Recurring | Quoted Prices in Active Markets (Level 1)
Fair Value
Investments at fair value	439,098	528,994
Estimate of Fair Value Measurement | Recurring | Quoted Prices in Active Markets (Level 1) | Fixed Income
Fair Value
Investments at fair value	5,324	5,112
Estimate of Fair Value Measurement | Recurring | Quoted Prices in Active Markets (Level 1) | Money market funds
Fair Value
Investments at fair value	398,475	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	16,893	16,411
Estimate of Fair Value Measurement | Recurring | Quoted Prices in Active Markets (Level 1) | Mutual funds
Fair Value
Investments at fair value	18,062	14,327
Estimate of Fair Value Measurement | Recurring | Quoted Prices in Active Markets (Level 1) | Domestic stock
Fair Value
Investments at fair value	16,860	13,330
Estimate of Fair Value Measurement | Recurring | Quoted Prices in Active Markets (Level 1) | International stock funds
Fair Value
Investments at fair value	704	509
Estimate of Fair Value Measurement | Recurring | Quoted Prices in Active Markets (Level 1) | Target funds
Fair Value
Investments at fair value	10	9
Estimate of Fair Value Measurement | Recurring | Quoted Prices in Active Markets (Level 1) | Bond funds
Fair Value
Investments at fair value	6	5
Estimate of Fair Value Measurement | Recurring | Quoted Prices in Active Markets (Level 1) | Alternative funds
Fair Value
Investments at fair value	482	474
Estimate of Fair Value Measurement | Recurring | Prices with Other Observable Inputs (Level 2)
Fair Value
Investments at fair value	42,082	25,109
Estimate of Fair Value Measurement | Recurring | Prices with Other Observable Inputs (Level 2) | Fixed Income
Fair Value
Investments at fair value	26,034	18,976
Estimate of Fair Value Measurement | Recurring | Prices with Other Observable Inputs (Level 2) | Money market funds
Fair Value
Investments at fair value	16,048	6,133
Estimate of Fair Value Measurement | Recurring | Prices with Unobservable Inputs (Level 3)
Fair Value
Investments at fair value	26,033	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	$ 4,033	$ 4,052

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