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DOCUMENT AND ENTITY INFORMATION - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2023
Nov. 13, 2023
Apr. 01, 2023
Entity Addresses [Line Items]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Sep. 30, 2023    
Current Fiscal Year End Date --09-30    
Document Transition Report false    
Entity File Number 000-00121    
Entity Registrant Name KULICKE AND SOFFA INDUSTRIES, INC.    
Entity Incorporation, State or Country Code PA    
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, 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 Interactive Data Current Yes    
Entity Filer Category Large Accelerated Filer    
Entity Emerging Growth Company false    
Entity Small Business false    
ICFR Auditor Attestation Flag true    
Document Financial Statement Error Correction false    
Entity Shell Company false    
Entity Public Float     $ 2,987.5
Entity Common Stock, Shares Outstanding   56,720,044  
Entity Central Index Key 0000056978    
Amendment Flag false    
Document Fiscal Period Focus FY    
Document Fiscal Year Focus 2023    
Principal Executive Offices      
Entity Addresses [Line Items]      
Entity Address, Address Line One 1005 Virginia Dr.    
Entity Address, Postal Zip Code 19034    
Entity Address, City or Town Fort Washington    
Entity Address, State or Province PA