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BUSINESS COMBINATION Pro Forma Information (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 6 Months Ended | 3 Months Ended
--- | --- | --- | ---
Mar. 28, 2015 | Mar. 29, 2014 | Mar. 28, 2015 | Mar. 29, 2014 | Mar. 28, 2015
Business Acquisition [Line Items] |  |  |  |  |
Revenue | $ 145,915 us-gaap_BusinessAcquisitionsProFormaRevenue | $ 133,710 us-gaap_BusinessAcquisitionsProFormaRevenue | $ 278,948 us-gaap_BusinessAcquisitionsProFormaRevenue | $ 232,636 us-gaap_BusinessAcquisitionsProFormaRevenue |
Net income (loss) | 7,576 us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss | 5,976 us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss | 10,436 us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss | 1,279 us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss |
Basic income per common share (usd per share) | $ 0.10 us-gaap_BusinessAcquisitionProFormaEarningsPerShareBasic | $ 0.08 us-gaap_BusinessAcquisitionProFormaEarningsPerShareBasic | $ 0.14 us-gaap_BusinessAcquisitionProFormaEarningsPerShareBasic | $ 0.02 us-gaap_BusinessAcquisitionProFormaEarningsPerShareBasic |
Diluted income per common share (usd per share) | $ 0.10 us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted | $ 0.08 us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted | $ 0.13 us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted | $ 0.02 us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted |
Assembléon B.V. [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Revenue |  |  |  |  | 16,900 us-gaap_BusinessAcquisitionsProFormaRevenue / us-gaap_BusinessAcquisitionAxis = klic_AssemblonB.V.Member
Net income (loss) |  |  |  |  | $ (3,900)us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss / us-gaap_BusinessAcquisitionAxis = klic_AssemblonB.V.Member

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