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FAIR VALUE - Asset Measured at Fair Value (Details) - USD ($) $ in Thousands	Sep. 24, 2022	Sep. 25, 2021
Money market funds | Cash and Cash Equivalents
Fair Value
Investments at fair value	$ 4,700
Money market funds | Restricted Investment
Fair Value
Investments at fair value	100
Fixed Income | Restricted Investment
Fair Value
Investments at fair value	19,200
Mutual funds, equity and alternative investments | Investments
Fair Value
Investments at fair value	33,200
Money market and mutual funds | Other Non current Assets
Fair Value
Investments at fair value	500
Ardellis Insurance Ltd.
Fair Value
Total Fair Value	52,360	$ 52,017
Estimate of Fair Value Measurement | Recurring
Fair Value
Investments at fair value	57,707	55,331
Assets at fair value	57,707	55,331
Estimate of Fair Value Measurement | Recurring | Money market funds
Fair Value
Investments at fair value	4,844	2,650
Estimate of Fair Value Measurement | Recurring | Fixed Income
Fair Value
Investments at fair value	18,905	17,983
Estimate of Fair Value Measurement | Recurring | Treasury securities
Fair Value
Investments at fair value	343	310
Estimate of Fair Value Measurement | Recurring | Equity
Fair Value
Investments at fair value	15,674	18,543
Estimate of Fair Value Measurement | Recurring | Alternative Investments
Fair Value
Investments at fair value	4,136	3,536
Estimate of Fair Value Measurement | Recurring | Mutual Fund
Fair Value
Investments at fair value	13,805	12,309
Estimate of Fair Value Measurement | Recurring | Domestic stock
Fair Value
Investments at fair value	11,859	9,968
Estimate of Fair Value Measurement | Recurring | International stock funds
Fair Value
Investments at fair value	1,279	1,675
Estimate of Fair Value Measurement | Recurring | Target funds
Fair Value
Investments at fair value	8	23
Estimate of Fair Value Measurement | Recurring | Bond funds
Fair Value
Investments at fair value	132	146
Estimate of Fair Value Measurement | Recurring | Alternative funds
Fair Value
Investments at fair value	527	497
Estimate of Fair Value Measurement | Recurring | Quoted Prices in Active Markets (Level 1)
Fair Value
Investments at fair value	32,425	32,143
Assets at fair value	32,425	32,143
Estimate of Fair Value Measurement | Recurring | Quoted Prices in Active Markets (Level 1) | Money market funds
Fair Value
Investments at fair value	19	19
Estimate of Fair Value Measurement | Recurring | Quoted Prices in Active Markets (Level 1) | Fixed Income
Fair Value
Investments at fair value	2,584	962
Estimate of Fair Value Measurement | Recurring | Quoted Prices in Active Markets (Level 1) | Treasury securities
Fair Value
Investments at fair value	343	310
Estimate of Fair Value Measurement | Recurring | Quoted Prices in Active Markets (Level 1) | Equity
Fair Value
Investments at fair value	15,674	18,543
Estimate of Fair Value Measurement | Recurring | Quoted Prices in Active Markets (Level 1) | Mutual Fund
Fair Value
Investments at fair value	13,805	12,309
Estimate of Fair Value Measurement | Recurring | Quoted Prices in Active Markets (Level 1) | Domestic stock
Fair Value
Investments at fair value	11,859	9,968
Estimate of Fair Value Measurement | Recurring | Quoted Prices in Active Markets (Level 1) | International stock funds
Fair Value
Investments at fair value	1,279	1,675
Estimate of Fair Value Measurement | Recurring | Quoted Prices in Active Markets (Level 1) | Target funds
Fair Value
Investments at fair value	8	23
Estimate of Fair Value Measurement | Recurring | Quoted Prices in Active Markets (Level 1) | Bond funds
Fair Value
Investments at fair value	132	146
Estimate of Fair Value Measurement | Recurring | Quoted Prices in Active Markets (Level 1) | Alternative funds
Fair Value
Investments at fair value	527	497
Estimate of Fair Value Measurement | Recurring | Prices with Other Observable Inputs (Level 2)
Fair Value
Investments at fair value	21,146	19,652
Assets at fair value	21,146	19,652
Estimate of Fair Value Measurement | Recurring | Prices with Other Observable Inputs (Level 2) | Money market funds
Fair Value
Investments at fair value	4,825	2,631
Estimate of Fair Value Measurement | Recurring | Prices with Other Observable Inputs (Level 2) | Fixed Income
Fair Value
Investments at fair value	16,321	17,021
Estimate of Fair Value Measurement | Recurring | Prices with Unobservable Inputs (Level 3)
Fair Value
Investments at fair value	4,136	3,536
Assets at fair value	4,136	3,536
Estimate of Fair Value Measurement | Recurring | Prices with Unobservable Inputs (Level 3) | Alternative Investments
Fair Value
Investments at fair value	$ 4,136	$ 3,536

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale) and amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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