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SEGMENT INFORMATION (Operating information by segment) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Dec. 27, 2014 | Dec. 28, 2013
Net revenue: |  |
Net revenue | $ 107,438us-gaap_SalesRevenueNet | $ 79,113us-gaap_SalesRevenueNet
Cost of sales : |  |
Cost of sales | 52,704us-gaap_CostOfGoodsAndServicesSold | 40,748us-gaap_CostOfGoodsAndServicesSold
Gross profit : |  |
Gross profit | 54,734us-gaap_GrossProfit | 38,365us-gaap_GrossProfit
Operating expenses: |  |
Operating expenses | 45,008us-gaap_OperatingExpenses | 40,573us-gaap_OperatingExpenses
Income from operations: |  |
Income from operations | 9,726us-gaap_OperatingIncomeLoss | (2,208)us-gaap_OperatingIncomeLoss
Equipment [Member] |  |
Net revenue: |  |
Net revenue | 90,956us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = klic_EquipmentSegmentMember | 63,145us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = klic_EquipmentSegmentMember
Cost of sales : |  |
Cost of sales | 46,099us-gaap_CostOfGoodsAndServicesSold / us-gaap_StatementBusinessSegmentsAxis = klic_EquipmentSegmentMember | 34,473us-gaap_CostOfGoodsAndServicesSold / us-gaap_StatementBusinessSegmentsAxis = klic_EquipmentSegmentMember
Gross profit : |  |
Gross profit | 44,857us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = klic_EquipmentSegmentMember | 28,672us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = klic_EquipmentSegmentMember
Operating expenses: |  |
Operating expenses | 39,411us-gaap_OperatingExpenses / us-gaap_StatementBusinessSegmentsAxis = klic_EquipmentSegmentMember | 35,552us-gaap_OperatingExpenses / us-gaap_StatementBusinessSegmentsAxis = klic_EquipmentSegmentMember
Income from operations: |  |
Income from operations | 5,446us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = klic_EquipmentSegmentMember | (6,880)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = klic_EquipmentSegmentMember
Expendable Tools [Member] |  |
Net revenue: |  |
Net revenue | 16,482us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = klic_ExpendableToolsSegmentMember | 15,968us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = klic_ExpendableToolsSegmentMember
Cost of sales : |  |
Cost of sales | 6,605us-gaap_CostOfGoodsAndServicesSold / us-gaap_StatementBusinessSegmentsAxis = klic_ExpendableToolsSegmentMember | 6,275us-gaap_CostOfGoodsAndServicesSold / us-gaap_StatementBusinessSegmentsAxis = klic_ExpendableToolsSegmentMember
Gross profit : |  |
Gross profit | 9,877us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = klic_ExpendableToolsSegmentMember | 9,693us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = klic_ExpendableToolsSegmentMember
Operating expenses: |  |
Operating expenses | 5,597us-gaap_OperatingExpenses / us-gaap_StatementBusinessSegmentsAxis = klic_ExpendableToolsSegmentMember | 5,021us-gaap_OperatingExpenses / us-gaap_StatementBusinessSegmentsAxis = klic_ExpendableToolsSegmentMember
Income from operations: |  |
Income from operations | $ 4,280us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = klic_ExpendableToolsSegmentMember | $ 4,672us-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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