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INCOME TAXES (Effective income tax rate reconciliation) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Oct. 03, 2020	Jun. 27, 2020	Mar. 28, 2020	Dec. 28, 2019	Sep. 28, 2019	Jun. 29, 2019	Mar. 30, 2019	Dec. 29, 2018	Oct. 03, 2020	Sep. 28, 2019	Sep. 29, 2018
Income Tax Disclosure [Abstract]
Expected income provision based on the U.S. federal statutory tax rate									$ 13,510	$ 7,284	$ 43,568
Effect of earnings of foreign subsidiaries subject to different tax rates									(1,634)	(4,335)	(12,947)
Benefit from tax incentives									(6,781)	(5,084)	(20,429)
Benefit from research and development tax credits									(2,915)	(3,041)	(2,785)
Benefit from foreign tax credits									(1,701)	(22,744)	(3,939)
U.S. one-time transition tax									0	9,369	101,854
Remeasurement of deferred taxes									(145)	5,480	2,760
Valuation allowance									1,224	25,289	7,366
Foreign operations (withholding taxes, taxes on unrepatriated foreign earnings, and deemed income)									8,886	8,578	5,746
Unrecognized tax benefit									285	156	530
Non-deductible items									1,232	2,248	(758)
Other, net									37	(290)	(222)
Provision for (benefit from) income taxes	$ 8,013	$ 690	$ 1,162	$ 2,133	$ 3,804	$ 3,864	$ 4,672	$ 10,570	$ 11,998	$ 22,910	$ 120,744
Effective Income Tax Rate Reconciliation, Percent									18.60%	66.00%	68.00%

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