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INCOME TAXES (Effective income tax rate reconciliation) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Sep. 28, 2019	Jun. 29, 2019	Mar. 30, 2019	Dec. 29, 2018	Sep. 29, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 30, 2017	Sep. 28, 2019	Sep. 29, 2018	Sep. 30, 2017
Income Tax Disclosure [Abstract]
Expected income provision based on the U.S. federal statutory tax rate									$ 7,284	$ 43,568	$ 41,358
Effect of earnings of foreign subsidiaries subject to different tax rates									(4,335)	(12,947)	(22,832)
Benefit from tax incentives									(5,084)	(20,429)	(23,294)
Benefit from research and development tax credits									(3,041)	(2,785)	(1,859)
Benefit from foreign tax credits									(22,744)	(3,939)	(26,119)
U.S. one-time transition tax									9,369	101,854	0
Remeasurement of deferred taxes									5,480	2,760	0
Non-deductible goodwill impairment									0	0	8,805
Valuation allowance									25,289	7,366	6,458
Foreign operations (withholding taxes, taxes on unrepatriated foreign earnings, and deemed dividends)									8,578	5,746	6,039
Unrecognized tax benefit									156	530	2,936
Non-deductible items									2,248	(758)	778
Other, net									(290)	(222)	336
Provision for (benefit from) income taxes	$ 3,804	$ 3,864	$ 4,672	$ 10,570	$ (1,750)	$ 7,282	$ 4,800	$ 110,412	$ 22,910	$ 120,744	$ (7,394)
Effective Income Tax Rate Reconciliation, Percent									66.00%	68.00%	(6.20%)

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