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FAIR VALUE - Asset Measured at Fair Value (Details) - USD ($) $ in Thousands	Sep. 26, 2020	Sep. 28, 2019
Money market funds | Restricted Investments
Fair Value
Investments at fair value	$ 3,200
Fixed Income | Restricted Investments
Fair Value
Investments at fair value	16,800
Mutual funds, equity and alternative investments | Investments
Fair Value
Investments at fair value	20,500
Money market and mutual funds | Other Assets
Fair Value
Investments at fair value	900
Ardellis Insurance Ltd.
Fair Value
Total Fair Value	37,300	$ 32,327
Estimate of Fair Value Measurement | Recurring
Fair Value
Investments at fair value	41,387	90,966
Assets at fair value	41,387	90,966
Estimate of Fair Value Measurement | Recurring | Money market funds
Fair Value
Investments at fair value	3,197	57,624
Estimate of Fair Value Measurement | Recurring | Fixed Income
Fair Value
Investments at fair value	16,770	15,299
Estimate of Fair Value Measurement | Recurring | Equity
Fair Value
Investments at fair value	10,524	8,840
Estimate of Fair Value Measurement | Recurring | Alternative Investments
Fair Value
Investments at fair value	1,926	1,895
Estimate of Fair Value Measurement | Recurring | Mutual Fund
Fair Value
Investments at fair value	8,970	7,308
Estimate of Fair Value Measurement | Recurring | Domestic stock funds
Fair Value
Investments at fair value	6,826	2,630
Estimate of Fair Value Measurement | Recurring | International stock funds
Fair Value
Investments at fair value	1,243	2,054
Estimate of Fair Value Measurement | Recurring | Target funds
Fair Value
Investments at fair value	260	268
Estimate of Fair Value Measurement | Recurring | Bond funds
Fair Value
Investments at fair value	208	825
Estimate of Fair Value Measurement | Recurring | Alternative funds
Fair Value
Investments at fair value	433	1,531
Estimate of Fair Value Measurement | Recurring | Quoted Prices in Active Markets (Level 1)
Fair Value
Investments at fair value	19,806	73,662
Assets at fair value	19,806	73,662
Estimate of Fair Value Measurement | Recurring | Quoted Prices in Active Markets (Level 1) | Money market funds
Fair Value
Investments at fair value	64	56,781
Estimate of Fair Value Measurement | Recurring | Quoted Prices in Active Markets (Level 1) | Fixed Income
Fair Value
Investments at fair value	248	733
Estimate of Fair Value Measurement | Recurring | Quoted Prices in Active Markets (Level 1) | Equity
Fair Value
Investments at fair value	10,524	8,840
Estimate of Fair Value Measurement | Recurring | Quoted Prices in Active Markets (Level 1) | Mutual Fund
Fair Value
Investments at fair value	8,970	7,308
Estimate of Fair Value Measurement | Recurring | Quoted Prices in Active Markets (Level 1) | Domestic stock funds
Fair Value
Investments at fair value	6,826	2,630
Estimate of Fair Value Measurement | Recurring | Quoted Prices in Active Markets (Level 1) | International stock funds
Fair Value
Investments at fair value	1,243	2,054
Estimate of Fair Value Measurement | Recurring | Quoted Prices in Active Markets (Level 1) | Target funds
Fair Value
Investments at fair value	260	268
Estimate of Fair Value Measurement | Recurring | Quoted Prices in Active Markets (Level 1) | Bond funds
Fair Value
Investments at fair value	208	825
Estimate of Fair Value Measurement | Recurring | Quoted Prices in Active Markets (Level 1) | Alternative funds
Fair Value
Investments at fair value	433	1,531
Estimate of Fair Value Measurement | Recurring | Prices with Other Observable Inputs (Level 2)
Fair Value
Investments at fair value	19,655	15,409
Assets at fair value	19,655	15,409
Estimate of Fair Value Measurement | Recurring | Prices with Other Observable Inputs (Level 2) | Money market funds
Fair Value
Investments at fair value	3,133	843
Estimate of Fair Value Measurement | Recurring | Prices with Other Observable Inputs (Level 2) | Fixed Income
Fair Value
Investments at fair value	16,522	14,566
Estimate of Fair Value Measurement | Recurring | Prices with Unobservable Inputs (Level 3)
Fair Value
Investments at fair value	1,926	1,895
Assets at fair value	1,926	1,895
Estimate of Fair Value Measurement | Recurring | Prices with Unobservable Inputs (Level 3) | Alternative Investments
Fair Value
Investments at fair value	$ 1,926	$ 1,895

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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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