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DOCUMENT AND ENTITY INFORMATION - shares
9 Months Ended
Jul. 01, 2017
Aug. 02, 2017
Document and Entity Information [Abstract]    
Entity Registrant Name KULICKE & SOFFA INDUSTRIES INC  
Entity Central Index Key 0000056978  
Current Fiscal Year End Date --09-30  
Entity Filer Category Large Accelerated Filer  
Trading Symbol klic  
Entity Common Stock, Shares Outstanding   71,097,850
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Jul. 01, 2017  
Document Fiscal Period Focus Q3  
Document Fiscal Year Focus 2017