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COMMITMENTS, CONTINGENCIES AND CONCENTRATIONS - Narrative (Details)	3 Months Ended
	Jan. 02, 2021
Commitments and Contingencies Disclosure [Abstract]
Period Of Warranty For Manufacturing Defects	1 year

X

- Definition

Representing period of warranty for manufacturing defects.

+ References

No definition available.

+ Details

Name:	klic_PeriodOfWarrantyForManufacturingDefects
Namespace Prefix:	klic_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration