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SHAREHOLDERS' EQUITY AND EMPLOYEE BENEFIT PLANS (Restricted stock and common stock granted) (Details) In Thousands, unless otherwise specified | 3 Months Ended
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Dec. 27, 2014 | Dec. 28, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Equity-based compensation in shares | 717us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod | 920us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod
Market-based restricted stock [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Equity-based compensation in shares | 232us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod / us-gaap_AwardTypeAxis = klic_MarketBasedRestrictedStockMember | 324us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod / us-gaap_AwardTypeAxis = klic_MarketBasedRestrictedStockMember
Time-based restricted stock [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Equity-based compensation in shares | 472us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod / us-gaap_AwardTypeAxis = klic_TimeBasedRestrictedStockMember | 581us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod / us-gaap_AwardTypeAxis = klic_TimeBasedRestrictedStockMember
Common stock [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Equity-based compensation in shares | 13us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod / us-gaap_AwardTypeAxis = us-gaap_CommonStockMember | 15us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod / us-gaap_AwardTypeAxis = us-gaap_CommonStockMember

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- Definition Number of share instruments newly issued under a share-based compensation plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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