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SHAREHOLDERS' EQUITY AND EMPLOYEE BENEFIT PLANS (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Mar. 28, 2015
Mar. 28, 2015
Aug. 14, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock Repurchase Program, Authorized Amount     $ 100us-gaap_StockRepurchaseProgramAuthorizedAmount1
Description Of Maximum Percentage Of Employee Contributions and Matching Contributions Based Upon Years Of Service   employee contributions and matching Company contributions up to 4% or 6%  
Share-based Compensation Arrangement by Share-based Payment Award, Discount from Market Price, Offering Date   100.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardDiscountFromMarketPriceOfferingDate  
Relative Total Shareholder Return Average Stock Price Calculation Period   90 days  
Total Shareholder Return Award Performance Measurement Period   3 years  
Treasury Stock, Shares, Acquired 0.2us-gaap_TreasuryStockSharesAcquired 0.8us-gaap_TreasuryStockSharesAcquired  
Treasury Stock, Value, Acquired, Par Value Method $ 2.6us-gaap_TreasuryStockValueAcquiredParValueMethod $ 10.2us-gaap_TreasuryStockValueAcquiredParValueMethod  
Minimum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Defined Contribution Plan, Employer Matching Contribution, Percent   4.00%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
 
Share Based Compensation Arrangement By Share Based Payment Award Vesting Percentage 0.00%klic_ShareBasedCompensationArrangementByShareBasedPaymentAwardVestingPercentage
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
0.00%klic_ShareBasedCompensationArrangementByShareBasedPaymentAwardVestingPercentage
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
 
Maximum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Defined Contribution Plan, Employer Matching Contribution, Percent   6.00%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
 
Share Based Compensation Arrangement By Share Based Payment Award Vesting Percentage 200.00%klic_ShareBasedCompensationArrangementByShareBasedPaymentAwardVestingPercentage
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
200.00%klic_ShareBasedCompensationArrangementByShareBasedPaymentAwardVestingPercentage
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
 
Equity Incentive Plan 2009 [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant 3.0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_PlanNameAxis
= klic_EquityIncentivePlan2009Member
3.0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_PlanNameAxis
= klic_EquityIncentivePlan2009Member