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FAIR VALUE - Asset Measured at Fair Value (Details) - USD ($) $ in Thousands	Sep. 25, 2021	Sep. 26, 2020
Money market funds | Cash and Cash Equivalents
Fair Value
Investments at fair value	$ 100
Money market funds | Restricted Investments
Fair Value
Investments at fair value	2,600
Fixed Income | Restricted Investments
Fair Value
Investments at fair value	18,300
Mutual funds, equity and alternative investments | Investments
Fair Value
Investments at fair value	33,600
Money market and mutual funds | Other Assets
Fair Value
Investments at fair value	700
Ardellis Insurance Ltd.
Fair Value
Total Fair Value	52,017	$ 37,300
Estimate of Fair Value Measurement | Recurring
Fair Value
Investments at fair value	55,331	41,387
Assets at fair value	55,331	41,387
Estimate of Fair Value Measurement | Recurring | Money market funds
Fair Value
Investments at fair value	2,650	3,197
Estimate of Fair Value Measurement | Recurring | Fixed Income
Fair Value
Investments at fair value	17,983	16,770
Estimate of Fair Value Measurement | Recurring | Treasury securities
Fair Value
Investments at fair value	310
Estimate of Fair Value Measurement | Recurring | Equity
Fair Value
Investments at fair value	18,543	10,524
Estimate of Fair Value Measurement | Recurring | Alternative Investments
Fair Value
Investments at fair value	3,536	1,926
Estimate of Fair Value Measurement | Recurring | Mutual Fund
Fair Value
Investments at fair value	12,309	8,970
Estimate of Fair Value Measurement | Recurring | Domestic stock
Fair Value
Investments at fair value	9,968	6,826
Estimate of Fair Value Measurement | Recurring | International stock funds
Fair Value
Investments at fair value	1,675	1,243
Estimate of Fair Value Measurement | Recurring | Target funds
Fair Value
Investments at fair value	23	260
Estimate of Fair Value Measurement | Recurring | Bond funds
Fair Value
Investments at fair value	146	208
Estimate of Fair Value Measurement | Recurring | Alternative funds
Fair Value
Investments at fair value	497	433
Estimate of Fair Value Measurement | Recurring | Quoted Prices in Active Markets (Level 1)
Fair Value
Investments at fair value	32,143	19,806
Assets at fair value	32,143	19,806
Estimate of Fair Value Measurement | Recurring | Quoted Prices in Active Markets (Level 1) | Money market funds
Fair Value
Investments at fair value	19	64
Estimate of Fair Value Measurement | Recurring | Quoted Prices in Active Markets (Level 1) | Fixed Income
Fair Value
Investments at fair value	962	248
Estimate of Fair Value Measurement | Recurring | Quoted Prices in Active Markets (Level 1) | Treasury securities
Fair Value
Investments at fair value	310
Estimate of Fair Value Measurement | Recurring | Quoted Prices in Active Markets (Level 1) | Equity
Fair Value
Investments at fair value	18,543	10,524
Estimate of Fair Value Measurement | Recurring | Quoted Prices in Active Markets (Level 1) | Mutual Fund
Fair Value
Investments at fair value	12,309	8,970
Estimate of Fair Value Measurement | Recurring | Quoted Prices in Active Markets (Level 1) | Domestic stock
Fair Value
Investments at fair value	9,968	6,826
Estimate of Fair Value Measurement | Recurring | Quoted Prices in Active Markets (Level 1) | International stock funds
Fair Value
Investments at fair value	1,675	1,243
Estimate of Fair Value Measurement | Recurring | Quoted Prices in Active Markets (Level 1) | Target funds
Fair Value
Investments at fair value	23	260
Estimate of Fair Value Measurement | Recurring | Quoted Prices in Active Markets (Level 1) | Bond funds
Fair Value
Investments at fair value	146	208
Estimate of Fair Value Measurement | Recurring | Quoted Prices in Active Markets (Level 1) | Alternative funds
Fair Value
Investments at fair value	497	433
Estimate of Fair Value Measurement | Recurring | Prices with Other Observable Inputs (Level 2)
Fair Value
Investments at fair value	19,652	19,655
Assets at fair value	19,652	19,655
Estimate of Fair Value Measurement | Recurring | Prices with Other Observable Inputs (Level 2) | Money market funds
Fair Value
Investments at fair value	2,631	3,133
Estimate of Fair Value Measurement | Recurring | Prices with Other Observable Inputs (Level 2) | Fixed Income
Fair Value
Investments at fair value	17,021	16,522
Estimate of Fair Value Measurement | Recurring | Prices with Unobservable Inputs (Level 3)
Fair Value
Investments at fair value	3,536	1,926
Assets at fair value	3,536	1,926
Estimate of Fair Value Measurement | Recurring | Prices with Unobservable Inputs (Level 3) | Alternative Investments
Fair Value
Investments at fair value	$ 3,536	$ 1,926

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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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