| Document and Entity Information | Nov. 01, 2021 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Document Period End Date | Nov. 1, 2021 |
| 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 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 |
| 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 |
