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DOCUMENT AND ENTITY INFORMATION - USD ($)
$ in Millions
 12 Months Ended
Oct. 02, 2021
Nov. 12, 2021
Apr. 03, 2021
Document and Entity Information [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Transition Report false    
Amendment Flag false    
Document Period End Date Oct. 02, 2021    
Entity File Number 0-121    
Entity Registrant Name KULICKE & SOFFA INDUSTRIES INC    
Entity Central Index Key 0000056978    
Entity Incorporation, State or Country Code PA    
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, Postal Zip Code 554369    
Entity Address, City or Town Singapore    
City Area Code 215    
Local Phone Number 784-6000    
Title of 12(b) Security Common Stock, Without Par Value    
Trading Symbol KLIC    
Security Exchange Name NASDAQ    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Public Float     $ 3,189.3
Entity Filer Category Large Accelerated Filer    
Entity Emerging Growth Company false    
Entity Small Business false    
Entity Interactive Data Current Yes    
Entity Shell Company false    
Entity Tax Identification Number 23-1498399    
ICFR Auditor Attestation Flag true    
Document Fiscal Period Focus FY    
Document Fiscal Year Focus 2021    
Current Fiscal Year End Date --10-02    
Entity Common Stock, Shares Outstanding   62,421,143  
Principal Executive Offices      
Entity Addresses [Line Items]      
Entity Address, Address Line One 1005 Virginia Dr.    
Entity Address, Postal Zip Code 19034    
Entity Address, State or Province PA    
Entity Address, City or Town Fort Washington