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DOCUMENT AND ENTITY INFORMATION - USD ($)
$ in Millions
 12 Months Ended
Oct. 03, 2015
Nov. 16, 2015
Mar. 27, 2015
Document and Entity Information [Abstract]      
Entity Registrant Name KULICKE & SOFFA INDUSTRIES INC    
Entity Central Index Key 0000056978    
Current Fiscal Year End Date --10-03    
Entity Filer Category Large Accelerated Filer    
Trading Symbol klic    
Entity Common Stock, Shares Outstanding   70,694,772  
Document Type 10-K    
Amendment Flag false    
Document Period End Date Oct. 03, 2015    
Document Fiscal Period Focus FY    
Document Fiscal Year Focus 2015    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Public Float     $ 1,283.1