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

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