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BASIS OF PRESENTATION (Inventories) (Narrative) (Details)	12 Months Ended
	Sep. 30, 2017
Equipment [Member]
Inventory [Line Items]
Reserves For Inventory In Excess Of Demand Inventory Future Consumption Period	18 months
Spare Parts [Member]
Inventory [Line Items]
Reserves For Inventory In Excess Of Demand Inventory Future Consumption Period	24 months
Expendable Tools [Member]
Inventory [Line Items]
Reserves For Inventory In Excess Of Demand Inventory Future Consumption Period	12 months

X

- Definition

Reserves for Inventory in Excess of Demand Inventory Future Consumption Period.

+ References

No definition available.

+ Details

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Namespace Prefix:	klic_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_PublicUtilitiesInventoryAxis=us-gaap_EquipmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_PublicUtilitiesInventoryAxis=klic_SparePartsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_PublicUtilitiesInventoryAxis=klic_ExpendableToolsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: