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SEGMENT INFORMATION (Operating information by segment) (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
Net revenue: |  |  |  |
Net revenue | $ 145,227 us-gaap_SalesRevenueNet | $ 114,206 us-gaap_SalesRevenueNet | $ 252,665 us-gaap_SalesRevenueNet | $ 193,319 us-gaap_SalesRevenueNet
Cost of sales : |  |  |  |
Cost of sales | 76,657 us-gaap_CostOfGoodsAndServicesSold | 56,534 us-gaap_CostOfGoodsAndServicesSold | 129,361 us-gaap_CostOfGoodsAndServicesSold | 97,282 us-gaap_CostOfGoodsAndServicesSold
Gross profit : |  |  |  |
Gross profit | 68,570 us-gaap_GrossProfit | 57,672 us-gaap_GrossProfit | 123,304 us-gaap_GrossProfit | 96,037 us-gaap_GrossProfit
Operating expenses: |  |  |  |
Operating expenses | 58,779 us-gaap_OperatingExpenses | 47,561 us-gaap_OperatingExpenses | 103,787 us-gaap_OperatingExpenses | 88,134 us-gaap_OperatingExpenses
Income from operations: |  |  |  |
Income from operations | 9,791 us-gaap_OperatingIncomeLoss | 10,111 us-gaap_OperatingIncomeLoss | 19,517 us-gaap_OperatingIncomeLoss | 7,903 us-gaap_OperatingIncomeLoss
Equipment [Member] |  |  |  |
Net revenue: |  |  |  |
Net revenue | 129,816 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = klic_EquipmentSegmentMember | 97,612 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = klic_EquipmentSegmentMember | 220,772 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = klic_EquipmentSegmentMember | 160,757 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = klic_EquipmentSegmentMember
Income from operations: |  |  |  |
Income from operations | 6,307 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = klic_EquipmentSegmentMember | 5,293 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = klic_EquipmentSegmentMember | 11,753 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = klic_EquipmentSegmentMember | (1,587)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = klic_EquipmentSegmentMember
Expendable Tools [Member] |  |  |  |
Net revenue: |  |  |  |
Net revenue | 15,411 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = klic_ExpendableToolsSegmentMember | 16,594 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = klic_ExpendableToolsSegmentMember | 31,893 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = klic_ExpendableToolsSegmentMember | 32,562 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = klic_ExpendableToolsSegmentMember
Income from operations: |  |  |  |
Income from operations | $ 3,484 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = klic_ExpendableToolsSegmentMember | $ 4,818 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = klic_ExpendableToolsSegmentMember | $ 7,764 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = klic_ExpendableToolsSegmentMember | $ 9,490 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = klic_ExpendableToolsSegmentMember

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- Definition The aggregate costs related to goods produced and sold and services rendered by an entity during the reporting period. This excludes costs incurred during the reporting period related to financial services rendered and other revenue generating activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 2 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.2(a),(d)) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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- Definition Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
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