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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Reclassifications Out of Accumulated OCI) (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Oct. 01, 2021
Jul. 02, 2021
Apr. 02, 2021
Jan. 01, 2021
Oct. 02, 2020
Jun. 26, 2020
Mar. 27, 2020
Dec. 27, 2019
Oct. 01, 2021
Oct. 02, 2020
Sep. 27, 2019
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                      
Amortization of loss                 $ 417,526 $ 329,216 $ 312,663
Tax effects $ 3,601 $ 10,300 $ 9,476 $ 6,164 $ 5,632 $ 2,688 $ 7,990 $ 2,159 29,541 18,469 15,094
Other income, net                 (1,418) (1,362) (796)
Net income $ 6,926 $ 28,774 $ 27,834 $ 19,847 $ 15,547 $ 12,869 $ 20,387 $ 6,430 83,381 55,233 51,413
Reclassification out of Accumulated Other Comprehensive Income | Unamortized loss on defined benefit pension plans                      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                      
Amortization of loss                 576 537 328
Tax effects                 (144) (134) (82)
Other income, net                     761
Net income                 $ 432 $ 403 $ (515)