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COMMITMENTS, CONTINGENCIES AND CONCENTRATIONS (Obligations not reflected on the Consolidated Balance Sheet) (Details) $ in Thousands | Jan. 02, 2021 USD ($)
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Commitments and Contingencies Disclosure [Abstract] |  |
Inventory purchase obligation | $ 362,675 | [1]
Inventory purchase obligation, Payments due by fiscal year 2021 | 362,675 | [1]
Inventory purchase obligation, Payments due by fiscal year 2022 | 0 | [1]
Inventory purchase obligation, Payments due by fiscal year 2023 | 0 | [1]
Inventory purchase obligation, Payments due by fiscal year 2024 | 0 | [1]
Inventory purchase obligation, Payments due by fiscal year 2025 | 0 | [1]
Inventory purchase obligation, Payments due by fiscal year thereafter | $ 0 |
[1] | The Company orders inventory components in the normal course of its business. A portion of these orders are non-cancellable and some orders impose varying penalties and charges in the event of cancellation.

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- Definition The amount of inventory purchase obligation of future minimum payments due reported as of the period. + References No definition available. + Details
Name: | klic_InventoryPurchaseObligationFutureMinimumPaymentsDue
Namespace Prefix: | klic_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The inventory purchase obligation of future minimum payment which are due for the current reported as of the period. + References No definition available. + Details
Name: | klic_InventoryPurchaseObligationFutureMinimumPaymentsDueCurrent
Namespace Prefix: | klic_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Inventory Purchase Obligation Future Minimum Payments Due In Five Years + References No definition available. + Details
Name: | klic_InventoryPurchaseObligationFutureMinimumPaymentsDueInFiveYears
Namespace Prefix: | klic_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The inventory purchase obligation of future minimum payment which are due for four years reported as of the period. + References No definition available. + Details
Name: | klic_InventoryPurchaseObligationFutureMinimumPaymentsDueInFourYears
Namespace Prefix: | klic_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The inventory purchase obligation of future minimum payment which are due for three years reported as of the period. + References No definition available. + Details
Name: | klic_InventoryPurchaseObligationFutureMinimumPaymentsDueInThreeYears
Namespace Prefix: | klic_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The inventory purchase obligation of future minimum payment which are due for two years reported as of the period. + References No definition available. + Details
Name: | klic_InventoryPurchaseObligationFutureMinimumPaymentsDueInTwoYears
Namespace Prefix: | klic_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The inventory purchase obligation of future minimum payment which are due for fiscal year reported as of the period. + References No definition available. + Details
Name: | klic_InventoryPurchaseObligationFutureMinimumPaymentsDueThereafter
Namespace Prefix: | klic_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration