COMMITMENTS, CONTINGENCIES AND CONCENTRATIONS (Obligations not reflected on the Consolidated Balance Sheet) (Details) $ in Thousands	Jan. 01, 2022 USD ($)
Commitments and Contingencies Disclosure [Abstract]
Inventory purchase obligation	$ 471,258
Inventory purchase obligation, Payments due by fiscal year 2022	204,484
Inventory purchase obligation, Payments due by fiscal year 2023	266,774
Inventory purchase obligation, Payments due by fiscal year 2024	0
Inventory purchase obligation, Payments due by fiscal year 2025	0
Inventory purchase obligation, Payments due by fiscal year 2026	0
Inventory purchase obligation, Payments due by fiscal year thereafter	$ 0

The amount of inventory purchase obligation of future minimum payments due reported as of the period.

No definition available.

Name:	klic_InventoryPurchaseObligationFutureMinimumPaymentsDue
Namespace Prefix:	klic_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

The inventory purchase obligation of future minimum payment which are due for the current reported as of the period.

No definition available.

Name:	klic_InventoryPurchaseObligationFutureMinimumPaymentsDueCurrent
Namespace Prefix:	klic_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Inventory Purchase Obligation Future Minimum Payments Due In Five Years

No definition available.

Name:	klic_InventoryPurchaseObligationFutureMinimumPaymentsDueInFiveYears
Namespace Prefix:	klic_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

The inventory purchase obligation of future minimum payment which are due for four years reported as of the period.

No definition available.

Name:	klic_InventoryPurchaseObligationFutureMinimumPaymentsDueInFourYears
Namespace Prefix:	klic_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

The inventory purchase obligation of future minimum payment which are due for three years reported as of the period.

No definition available.

Name:	klic_InventoryPurchaseObligationFutureMinimumPaymentsDueInThreeYears
Namespace Prefix:	klic_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

The inventory purchase obligation of future minimum payment which are due for two years reported as of the period.

No definition available.

Name:	klic_InventoryPurchaseObligationFutureMinimumPaymentsDueInTwoYears
Namespace Prefix:	klic_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

The inventory purchase obligation of future minimum payment which are due for fiscal year reported as of the period.

No definition available.

Name:	klic_InventoryPurchaseObligationFutureMinimumPaymentsDueThereafter
Namespace Prefix:	klic_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

No definition available.

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