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GOODWILL AND INTANGIBLE ASSETS (Net intangible assets) (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 29, 2018	Sep. 29, 2018
Finite-Lived Intangible Assets [Line Items]
Net intangible assets	$ 50,252	$ 52,871
Developed technology [Member]
Finite-Lived Intangible Assets [Line Items]
Gross intangible assets	89,687	90,500
Accumulated amortization	(46,153)	(45,229)
Net intangible assets	43,534	45,271
Customer relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Gross intangible assets	35,896	36,131
Accumulated amortization	(30,352)	(29,820)
Net intangible assets	5,544	6,311
Trade name [Member]
Finite-Lived Intangible Assets [Line Items]
Gross intangible assets	7,338	7,377
Accumulated amortization	(6,164)	(6,088)
Net intangible assets	1,174	1,289
Other intangible assets [Member]
Finite-Lived Intangible Assets [Line Items]
Gross intangible assets	2,500	2,500
Accumulated amortization	(2,500)	(2,500)
Net intangible assets	$ 0	$ 0
Average estimated useful lives (in years)	1 year 10 months 24 days
Minimum [Member] | Developed technology [Member]
Finite-Lived Intangible Assets [Line Items]
Average estimated useful lives (in years)	7 years
Minimum [Member] | Customer relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Average estimated useful lives (in years)	5 years
Minimum [Member] | Trade name [Member]
Finite-Lived Intangible Assets [Line Items]
Average estimated useful lives (in years)	7 years
Maximum [Member] | Developed technology [Member]
Finite-Lived Intangible Assets [Line Items]
Average estimated useful lives (in years)	15 years
Maximum [Member] | Customer relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Average estimated useful lives (in years)	6 years
Maximum [Member] | Trade name [Member]
Finite-Lived Intangible Assets [Line Items]
Average estimated useful lives (in years)	8 years

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- Definition

Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
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- Definition

Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 928
-SubTopic 340
-Section 50
-Paragraph 1
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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
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