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COMMITMENTS, CONTINGENCIES AND CONCENTRATIONS (Narrative) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 27, 2014 | Sep. 27, 2014 | Dec. 01, 2013 | May 07, 2012 sqft
Commitments and Contingencies Disclosure [Abstract] |  |  |  |
Area of Land |  |  |  | 198,000us-gaap_AreaOfLand
Percentage Of Building Area Agreed To Lease From Landlord |  |  |  | 70.00%klic_PercentageOfBuildingAreaAgreedToLeaseFromLandlord
Lessee Leasing Arrangements, Operating Leases, Term of Contract | 10 years |  |  |
Period Of Warranty For Manufacturing Defects | 1 year |  |  |
Lease Expiration Year | 2018 |  |  |
Financing obligation | $ 18,261us-gaap_PresentValueOfFutureMinimumLeasePaymentsSaleLeasebackTransactions | $ 19,102us-gaap_PresentValueOfFutureMinimumLeasePaymentsSaleLeasebackTransactions | $ 20,000us-gaap_PresentValueOfFutureMinimumLeasePaymentsSaleLeasebackTransactions |

X
- Definition The year in which lease expires. + References No definition available. + Details
Name: | klic_LeaseExpirationYear
Namespace Prefix: | klic_
Data Type: | xbrli:gYearItemType
Balance Type: | na
Period Type: | duration

X
- 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

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
- 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

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

X
- 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: | us-gaap_LesseeLeasingArrangementsOperatingLeasesTermOfContract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- 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