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SEGMENT INFORMATION (Capital expenditures and depreciation expense by segment) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Dec. 27, 2014	Dec. 28, 2013
Capital expenditures:
Property, Plant and Equipment, Additions	$ 2,253us-gaap_PropertyPlantAndEquipmentAdditions	$ 5,429us-gaap_PropertyPlantAndEquipmentAdditions
Depreciation expense:
Depreciation expense	2,227us-gaap_Depreciation	1,663us-gaap_Depreciation
Equipment [Member]
Capital expenditures:
Property, Plant and Equipment, Additions	1,736us-gaap_PropertyPlantAndEquipmentAdditions / us-gaap_StatementBusinessSegmentsAxis = klic_EquipmentSegmentMember	4,232us-gaap_PropertyPlantAndEquipmentAdditions / us-gaap_StatementBusinessSegmentsAxis = klic_EquipmentSegmentMember
Depreciation expense:
Depreciation expense	1,585us-gaap_Depreciation / us-gaap_StatementBusinessSegmentsAxis = klic_EquipmentSegmentMember	1,098us-gaap_Depreciation / us-gaap_StatementBusinessSegmentsAxis = klic_EquipmentSegmentMember
Expendable Tools [Member]
Capital expenditures:
Property, Plant and Equipment, Additions	517us-gaap_PropertyPlantAndEquipmentAdditions / us-gaap_StatementBusinessSegmentsAxis = klic_ExpendableToolsSegmentMember	1,197us-gaap_PropertyPlantAndEquipmentAdditions / us-gaap_StatementBusinessSegmentsAxis = klic_ExpendableToolsSegmentMember
Depreciation expense:
Depreciation expense	$ 642us-gaap_Depreciation / us-gaap_StatementBusinessSegmentsAxis = klic_ExpendableToolsSegmentMember	$ 565us-gaap_Depreciation / us-gaap_StatementBusinessSegmentsAxis = klic_ExpendableToolsSegmentMember

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- Definition

The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585

+ Details

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- Definition

Amount of acquisition of long-lived, physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

+ References

No definition available.

+ Details

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