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OTHER FINANCIAL DATA Other Financial Data (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 29, 2018	Sep. 30, 2017	Oct. 01, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Incentive Compensation Expense	$ 25,607	$ 29,612	$ 14,661
Rent Expense	4,914	5,071	5,901
Warranty and Retrofit Expense	$ 13,110	$ 13,740	$ 11,557

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

- Definition

Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line.

+ References

No definition available.

+ Details

Name:	us-gaap_LeaseAndRentalExpense
Namespace Prefix:	us-gaap_
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