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DOCUMENT AND ENTITY INFORMATION - shares	9 Months Ended
	Jun. 30, 2018	Jul. 30, 2018
Document and Entity Information [Abstract]
Entity Registrant Name	KULICKE & SOFFA INDUSTRIES INC
Entity Central Index Key	0000056978
Current Fiscal Year End Date	--09-29
Entity Filer Category	Large Accelerated Filer
Trading Symbol	klic
Entity Common Stock, Shares Outstanding		67,571,990
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2018
Document Fiscal Period Focus	Q3
Document Fiscal Year Focus	2018

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A unique 10-digit SEC-issued value to identify entities that have filed disclosures with the SEC. It is commonly abbreviated as CIK.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Regulation 12B
-Number 240
-Section 12b
-Subsection 1

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Indicate number of shares or other units outstanding of each of registrant's classes of capital or common stock or other ownership interests, if and as stated on cover of related periodic report. Where multiple classes or units exist define each class/interest by adding class of stock items such as Common Class A [Member], Common Class B [Member] or Partnership Interest [Member] onto the Instrument [Domain] of the Entity Listings, Instrument.

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