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Commitments and Contingencies (Details) $ in Millions	Sep. 30, 2025 USD ($)
Commitments and Contingencies Disclosure [Abstract]
Employees under contract terminated by employer following a change in control	$ 27.4
Employees under contract terminated by employer without good cause or change in control	$ 8.6

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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

X

- 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