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BUSINESS COMBINATION Narrative (Details)	3 Months Ended		6 Months Ended			0 Months Ended		3 Months Ended		6 Months Ended
	Mar. 28, 2015 USD ($)	Mar. 29, 2014 USD ($)	Mar. 28, 2015 USD ($)	Mar. 29, 2014 USD ($)	Mar. 28, 2015 EUR (€)	Dec. 29, 2014 Assembléon B.V. [Member] USD ($)	Dec. 29, 2014 Assembléon B.V. [Member] EUR (€)	Mar. 28, 2015 Assembléon B.V. [Member] USD ($)	Mar. 28, 2015 Selling, General and Administrative Expenses [Member] Assembléon B.V. [Member] USD ($)	Mar. 28, 2015 Selling, General and Administrative Expenses [Member] Assembléon B.V. [Member] USD ($)
Business Acquisition [Line Items]
Purchase price						$ 97,400,000us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = klic_AssemblonB.V.Member	€ 80,000,000us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = klic_AssemblonB.V.Member
Cash consideration						72,500,000us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = klic_AssemblonB.V.Member
Consideration to settle intercompany loans						24,900,000us-gaap_BusinessCombinationConsiderationTransferredOther1 / us-gaap_BusinessAcquisitionAxis = klic_AssemblonB.V.Member
Escrow deposit	14,600,000us-gaap_EscrowDeposit		14,600,000us-gaap_EscrowDeposit		12,000,000us-gaap_EscrowDeposit
Revenue	145,915,000us-gaap_BusinessAcquisitionsProFormaRevenue	133,710,000us-gaap_BusinessAcquisitionsProFormaRevenue	278,948,000us-gaap_BusinessAcquisitionsProFormaRevenue	232,636,000us-gaap_BusinessAcquisitionsProFormaRevenue				16,900,000us-gaap_BusinessAcquisitionsProFormaRevenue / us-gaap_BusinessAcquisitionAxis = klic_AssemblonB.V.Member
Net income (loss)	7,576,000us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss	5,976,000us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss	10,436,000us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss	1,279,000us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss				(3,900,000)us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss / us-gaap_BusinessAcquisitionAxis = klic_AssemblonB.V.Member
Business Combination, Separately Recognized Transactions, Additional Disclosures, Acquisition Cost Expensed									$ 0us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsAdditionalDisclosuresAcquisitionCostExpensed / us-gaap_BusinessAcquisitionAxis = klic_AssemblonB.V.Member / us-gaap_IncomeStatementLocationAxis = us-gaap_SellingGeneralAndAdministrativeExpensesMember	$ 1,000,000us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsAdditionalDisclosuresAcquisitionCostExpensed / us-gaap_BusinessAcquisitionAxis = klic_AssemblonB.V.Member / us-gaap_IncomeStatementLocationAxis = us-gaap_SellingGeneralAndAdministrativeExpensesMember

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- Definition

The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 10

-Section 50

-Paragraph 2

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The pro forma revenue for a period as if the business combination or combinations had been completed at the beginning of the period.

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Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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Amount of tangible or intangible assets, including a business or subsidiary of the acquirer transferred by the entity to the former owners of the acquiree. Excludes cash.

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For transactions that are recognized separately from the acquisition of assets and assumptions of liabilities in the business combination, such as related to pre-existing relationships with the acquiree, this element represents the disclosure of the amount of acquisition related costs which have been expensed.

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The designation of funds furnished by a borrower to a lender to assure future payments of the borrower's real estate taxes and insurance obligations with respect to a mortgaged property. Escrow deposits may be made for a variety of other purposes such as earnest money and contingent payments. This element excludes replacement reserves which are an escrow separately provided for within the US GAAP taxonomy.

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The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

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