SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Reclassifications Out of Accumulated OCI) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Oct. 02, 2020	Jun. 26, 2020	Mar. 27, 2020	Dec. 27, 2019	Sep. 27, 2019	Jun. 28, 2019	Mar. 29, 2019	Dec. 28, 2018	Oct. 02, 2020	Sep. 27, 2019	Sep. 28, 2018
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amortization of loss									$ 329,216	$ 312,663	$ 302,408
Tax effects	$ 5,632	$ 2,688	$ 7,990	$ 2,159	$ (639)	$ 6,826	$ 8,097	$ 810	18,469	15,094	27,437
Write off of currency translation amounts									(1,362)	(796)	(4,122)
Net income	$ 15,547	$ 12,869	$ 20,387	$ 6,430	$ 3,903	$ 22,066	$ 21,923	$ 3,521	55,233	51,413	40,669
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									537	328	553
Tax effects									(134)	(82)	(133)
Write off of currency translation amounts										761	2,378
Net income									$ 403	$ (515)	$ (1,958)