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v3.23.1

Commitments and Contingencies (Details) $ in Millions | Mar. 31, 2023 USD ($)
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Commitments and Contingencies Disclosure [Abstract] |
Employees under contract terminated by employer without good cause or in absence of change in control | $ 40.4
Employees under contract terminated by employer without good cause or change in control | $ 17.4

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- Definition Supplemental unemployment benefits for employees under contract that are terminated without good cause or the employee resigns for good reason following a change in control. + References No definition available. + Details
Name: | kfrc_SupplementalUnemploymentBenefitsOnChangeInControl
Namespace Prefix: | kfrc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Supplemental unemployment benefits for employees under contract that are terminated without good cause or the employee resigns for good reason in the absence of a change in control. + References No definition available. + Details
Name: | kfrc_SupplementalUnemploymentBenefitsOnNoChangeInControl
Namespace Prefix: | kfrc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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