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SEGMENT INFORMATION (Operating information by segment) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	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.

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Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity.

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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.

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