GOODWILL AND INTANGIBLE ASSETS (Net intangible assets) (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
Mar. 28, 2015	Sep. 27, 2014
Finite-Lived Intangible Assets [Line Items]
Net intangible assets	$ 63,279	$ 5,891
Wedge bonder developed technology [Member]
Finite-Lived Intangible Assets [Line Items]
Gross intangible assets	33,200	33,200
Acquired in business combination	40,880	0
Accumulated amortization	(31,511)	(28,458)
Net intangible assets	42,569	4,742
Wedge bonder customer relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Gross intangible assets	19,300	19,300
Acquired in business combination	17,668	0
Accumulated amortization	(19,931)	(19,300)
Net intangible assets	17,037	0
Wedge bonder trade name [Member]
Finite-Lived Intangible Assets [Line Items]
Gross intangible assets	4,600	4,600
Acquired in business combination	2,915	0
Accumulated amortization	(3,842)	(3,451)
Net intangible assets	3,673	1,149
Wedge bonder 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] \| Wedge bonder developed technology [Member]
Finite-Lived Intangible Assets [Line Items]
Average estimated useful lives (in years)	7 years
Minimum [Member] \| Wedge bonder customer relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Average estimated useful lives (in years)	5 years
Minimum [Member] \| Wedge bonder trade name [Member]
Finite-Lived Intangible Assets [Line Items]
Average estimated useful lives (in years)	7 years
Maximum [Member] \| Wedge bonder developed technology [Member]
Finite-Lived Intangible Assets [Line Items]
Average estimated useful lives (in years)	15 years
Maximum [Member] \| Wedge bonder customer relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Average estimated useful lives (in years)	6 years
Maximum [Member] \| Wedge bonder trade name [Member]
Finite-Lived Intangible Assets [Line Items]
Average estimated useful lives (in years)	8 years

Amount of intangible assets, excluding goodwill, acquired at the acquisition date.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 2

-Subparagraph (a)(1)

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

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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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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://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16212-109274

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-Topic 350

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