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OTHER FINANCIAL DATA Other Financial Data (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2023 | Oct. 01, 2022 | Oct. 02, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |  |
Incentive compensation expense | $ 10,424 | $ 27,011 | $ 39,779
Warranty and retrofit expense | $ 13,729 | $ 16,349 | $ 22,068

X
- Definition Amount of selling general and administrative incentive compensation expenses during the reporting period. + References No definition available. + Details
Name: | klic_SellingGeneralAndAdministrativeIncentiveCompensationExpense
Namespace Prefix: | klic_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of warranty and retrofit expenses during the period. + References No definition available. + Details
Name: | klic_WarrantyAndRetrofitExpense
Namespace Prefix: | klic_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration