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DOCUMENT AND ENTITY INFORMATION - shares	3 Months Ended
	Dec. 29, 2018	Jan. 28, 2019
Document and Entity Information [Abstract]
Entity Registrant Name	KULICKE & SOFFA INDUSTRIES INC
Entity Central Index Key	0000056978
Current Fiscal Year End Date	--09-28
Entity Filer Category	Large Accelerated Filer
Trading Symbol	klic
Entity Common Stock, Shares Outstanding		66,140,665
Document Type	10-Q
Amendment Flag	false
Entity Emerging Growth Company	false
Entity Small Business	false
Document Period End Date	Dec. 29, 2018
Document Fiscal Period Focus	Q1
Document Fiscal Year Focus	2019

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Number 240
-Section 12
-Subsection b-2

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