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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (New Accounting Pronouncements) (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 29, 2017	Sep. 28, 2018	Sep. 29, 2017	Sep. 30, 2016	Oct. 02, 2015
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cash and cash equivalents		$ 121,877	$ 63,810	$ 87,294	$ 69,159
Operating expenses		(178,839)	(165,349)	(153,568)
Other expenses		(4,122)	$ (3,060)	$ (1,407)
Accounting Standards Update 2017-07
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating expenses	$ 848
Other expenses	$ 848
Foreign
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cash and cash equivalents		$ 40,999

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