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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Foreign Operations And Related Derivative Financial Instruments) (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 27, 2019	Sep. 28, 2018	Sep. 29, 2017
Foreign Currencies [Line Items]
Currency gains from transactions	$ 645	$ 1,985
Currency losses from transactions			$ 903
Percent of revenues in foreign currency	14.00%
Euro
Foreign Currencies [Line Items]
Percent of revenues in foreign currency	6.00%
Canadian Dollars
Foreign Currencies [Line Items]
Percent of revenues in foreign currency	5.00%
Various other foreign currencies
Foreign Currencies [Line Items]
Percent of revenues in foreign currency	3.00%

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Foreign Currencies [Line Items]

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 830
-SubTopic 20
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=109240200&loc=d3e30700-110894

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