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SHAREHOLDERS' EQUITY AND EMPLOYEE BENEFIT PLANS (Total equity-based compensation expense) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 28, 2015 | Mar. 29, 2014 | Mar. 28, 2015 | Mar. 29, 2014
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |
Total equity-based compensation expense | $ 2,581 us-gaap_AllocatedShareBasedCompensationExpense | $ 2,686 us-gaap_AllocatedShareBasedCompensationExpense | $ 6,016 us-gaap_AllocatedShareBasedCompensationExpense | $ 6,082 us-gaap_AllocatedShareBasedCompensationExpense
Market-based restricted stock [Member] |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |
Total equity-based compensation expense | 994 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = klic_MarketBasedRestrictedStockMember | 1,170 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = klic_MarketBasedRestrictedStockMember | 2,344 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = klic_MarketBasedRestrictedStockMember | 2,642 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = klic_MarketBasedRestrictedStockMember
Time-based restricted stock [Member] |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |
Total equity-based compensation expense | 1,375 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = klic_TimeBasedRestrictedStockMember | 1,270 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = klic_TimeBasedRestrictedStockMember | 3,244 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = klic_TimeBasedRestrictedStockMember | 2,975 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = klic_TimeBasedRestrictedStockMember
Performance-based restricted stock |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |
Total equity-based compensation expense | 32 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = klic_PerformanceBasedRestrictedStockMember | 33 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = klic_PerformanceBasedRestrictedStockMember | 65 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = klic_PerformanceBasedRestrictedStockMember | 66 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = klic_PerformanceBasedRestrictedStockMember
Stock options [Member] |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |
Total equity-based compensation expense | 0 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember | 3 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember | 3 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember | 9 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember
Common stock [Member] |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |
Total equity-based compensation expense | 180 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_CommonStockMember | 210 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_CommonStockMember | 360 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_CommonStockMember | 390 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_CommonStockMember
Cost of sales [Member] |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |
Total equity-based compensation expense | 88 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember | 82 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember | 216 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember | 187 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember
Selling, general and administrative (1) [Member] |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |
Total equity-based compensation expense | 1,976 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = us-gaap_SellingGeneralAndAdministrativeExpensesMember | 2,126 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = us-gaap_SellingGeneralAndAdministrativeExpensesMember | 4,475 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = us-gaap_SellingGeneralAndAdministrativeExpensesMember | 4,742 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = us-gaap_SellingGeneralAndAdministrativeExpensesMember
Research and development [Member] |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |
Total equity-based compensation expense | $ 517 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = us-gaap_ResearchAndDevelopmentExpenseMember | $ 478 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = us-gaap_ResearchAndDevelopmentExpenseMember | $ 1,325 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = us-gaap_ResearchAndDevelopmentExpenseMember | $ 1,153 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = us-gaap_ResearchAndDevelopmentExpenseMember

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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