The year in which lease expires.

No definition available.

Name:	klic_LeaseExpirationYear
Namespace Prefix:	klic_
Data Type:	xbrli:gYearItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents percentage of building area agreed to lease from the landlord.

+ References

No definition available.

+ Details

Name:	klic_PercentageOfBuildingAreaAgreedToLeaseFromLandlord
Namespace Prefix:	klic_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- 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

- Definition

Area of land held.

+ References

No definition available.

+ Details

Name:	us-gaap_AreaOfLand
Namespace Prefix:	us-gaap_
Data Type:	num:areaItemType
Balance Type:	na
Period Type:	instant

- Definition

Term of lessee's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918673-209980

+ Details

Name:	us-gaap_LesseeOperatingLeaseTermOfContract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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

- Definition

Present value of minimum lease payments for sale-leaseback transactions accounted for using the deposit method or as a financing.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=84164817&loc=d3e45280-112737

+ Details

Name:	us-gaap_PresentValueOfFutureMinimumLeasePaymentsSaleLeasebackTransactions
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

+ References

No definition available.

+ Details

Name:	us-gaap_PropertyPlantAndEquipmentUsefulLife
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_BalanceSheetLocationAxis=klic_CurrentandNoncurrentPortionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_BuildingMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

COMMITMENTS, CONTINGENCIES AND CONCENTRATIONS (Narrative) (Details) $ in Thousands	9 Months Ended
	Jun. 29, 2019 USD ($)	Sep. 29, 2018 USD ($)	Dec. 01, 2013 USD ($) ft²
Other Commitments [Line Items]
Area of Land \| ft²			198,000
Percentage Of Building Area Agreed To Lease From Landlord			70.00%
Lessee, Operating Lease, Term of Contract	10 years
Period Of Warranty For Manufacturing Defects	1 year
Lease Expiration Year	2027
Financing obligation	$ 14,701	$ 15,187	$ 20,000
Current and Noncurrent Portion [Member]
Other Commitments [Line Items]
Financing obligation	$ 15,500
Building [Member]
Other Commitments [Line Items]
Property, Plant and Equipment, Useful Life	25 years