SHAREHOLDERS' EQUITY AND EMPLOYEE BENEFIT PLANS (Defined benefits pension obligations and pension expenses) (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Oct. 01, 2016
Defined Benefit Plan Disclosure [Line Items]
Pension obligation	$ 2,918	$ 3,318
Foreign Pension Plan, Defined Benefit [Member] \| Switzerland [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension obligation	1,951	2,393
Foreign Pension Plan, Defined Benefit [Member] \| Taiwan [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension obligation	$ 967	$ 925

1) For defined benefit pension plans, the benefit obligation is the projected benefit obligation, which is the actuarial present value as of a date of all benefits attributed by the pension benefit formula to employee service rendered prior to that date. 2) For other postretirement defined benefit plans, the benefit obligation is the accumulated postretirement benefit obligation, which is the actuarial present value of benefits attributed to employee service rendered to a particular date.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Projected Benefit Obligation
-URI http://asc.fasb.org/extlink&oid=6522206

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Accumulated Postretirement Benefit Obligation
-URI http://asc.fasb.org/extlink&oid=6503904

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant