This amount represents the combined annual rent and service charges for the maximum range of initial term.

No definition available.

Name:	klic_AnnualRentAndServiceChargeMaximumRange
Namespace Prefix:	klic_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

This amount represents the combined annual rent and service charges for the minimum range of initial term.

+ References

No definition available.

+ Details

Name:	klic_AnnualRentAndServiceChargeMinimumRange
Namespace Prefix:	klic_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Capital Lease Obligations, Interest Rate, Effective Percentage

+ References

No definition available.

+ Details

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

- Definition

Lessee Leasing Arrangements, Capital Leases, Number of Renewal Options

+ References

No definition available.

+ Details

Name:	klic_LesseeLeasingArrangementsCapitalLeasesNumberofRenewalOptions
Namespace Prefix:	klic_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Term of the lessee's leasing arrangement renewal, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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

- Definition

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

+ References

No definition available.

+ Details

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

- Definition

Percentage Of Building Area To Be Leased From Landlord

+ References

No definition available.

+ Details

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

- 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

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

- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(16))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

+ Details

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

- Definition

Period remaining on line of credit facility before it terminates, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

+ Details

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

- 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://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6455398&loc=d3e45280-112737

+ Details

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

- Details

Name:	us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=klic_KSCorporateHeadquartersMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LineOfCreditFacilityAxis=klic_CitibankMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LineOfCreditFacilityAxis=klic_UnitedOverseasBankLimitedMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_RevolvingCreditFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

DEBT AND OTHER OBLIGATIONS DEBT AND OTHER OBLIGATIONS (Details) $ in Thousands, $ in Millions			6 Months Ended
	Mar. 20, 2017	Dec. 01, 2013 SGD ($) renewal_option	Mar. 31, 2018 USD ($)	Sep. 30, 2017 USD ($)	Mar. 21, 2016 USD ($)	Dec. 01, 2013 USD ($) ft²	Nov. 22, 2013 USD ($)
Capital Leased Assets [Line Items]
Area of Land \| ft²						198,000
Financing obligation			$ 16,257	$ 16,074		$ 20,000
K&S Corporate Headquarters [Member]
Capital Leased Assets [Line Items]
Lease Agreement Term		10 years	10 years
Lessee Leasing Arrangements, Capital Leases, Number of Renewal Options \| renewal_option		2
Lessee Leasing Arrangements, Capital Leases, Renewal Term		10 years
Annual Rent and Service Charge Minimum Range		$ 4
Annual Rent and Service Charge Maximum Range		$ 5
Area of Land \| ft²						198,000
Percentage Of Building Area To Be Leased From Landlord						70.00%
Capital Lease Obligations, Interest Rate, Effective Percentage						6.30%
Citibank [Member]
Capital Leased Assets [Line Items]
Capacity under credit facility							$ 5,000
Outstanding amounts under credit facility			$ 3,500
United Overseas Bank Limited [Member] \| Revolving Credit Facility [Member]
Capital Leased Assets [Line Items]
Capacity under credit facility					$ 25,000
Credit facility term	1 year
Current and Noncurrent Portion [Member]
Capital Leased Assets [Line Items]
Financing obligation			$ 17,000