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OTHER FINANCIAL DATA Other Financial Data (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Oct. 02, 2021 | Oct. 03, 2020 | Sep. 28, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |  |
Incentive Compensation Expense | $ 39,779 | $ 18,524 | $ 423
Warranty and Retrofit Expense | $ 22,068 | $ 8,692 | $ 13,030

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