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Cover
May 05, 2021
Feb. 03, 2021
Cover [Abstract]    
Document Type 8-K  
Document Period End Date May 05, 2021  
Entity Registrant Name KULICKE & SOFFA INDUSTRIES INC  
Entity Incorporation, State or Country Code PA  
Entity File Number 000-00121  
Entity Tax Identification Number 23-1498399  
Entity Addresses [Line Items]    
Entity Address, Address Line One 23A Serangoon North Avenue 5  
Entity Address, Address Line Two #01-01  
Entity Address, Country SG  
Entity Address, City or Town Singapore  
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 Central Index Key 0000056978  
Amendment Flag false  
Principal Executive Offices    
Entity Addresses [Line Items]    
Entity Address, Address Line One 1005 Virginia Dr.  
Entity Address, City or Town Fort Washington  
Entity Address, Postal Zip Code 19034  
Entity Address, State or Province PA