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Document and Entity Information
Sep. 15, 2020
May 29, 2020
Cover [Abstract]    
Document Type 8-K  
Document Period End Date Sep. 15, 2020  
Entity Registrant Name KULICKE & SOFFA INDUSTRIES INC  
Entity Central Index Key 0000056978  
Amendment Flag false  
Entity Incorporation, State or Country Code PA  
Entity File Number 000-00121  
Entity Tax Identification Number 23-1498399  
Entity Address, Address Line One  23A Serangoon North Avenue 5  
Entity Address, Address Line Two #01-01  
Entity Address, Address Line Three K&S Corporate Headquarters  
Entity Address, Country SG  
Entity Address, Postal Zip Code   554369
City Area Code 215  
Local Phone Number 784-6000  
Written Communications false  
Soliciting Material false  
Pre-commencement Tender Offer false  
Pre-commencement Issuer Tender Offer false  
Entity Emerging Growth Company false  
Title of 12(b) Security Common Stock, Without Par Value  
Trading Symbol KLIC  
Security Exchange Name NASDAQ  
Entity Address, City or Town Singapore