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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