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Allowance for Credit Losses - Narrative (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Credit Loss [Abstract]
Amount unrelated to trade receivables included in allowance	$ 0.7	$ 0.5

X

- Definition

Accounts Receivable, Allowance For Credit Loss, Allowance Unrelated To Trade Receivables

+ References

No definition available.

+ Details

Name:	kfrc_AccountsReceivableAllowanceForCreditLossAllowanceUnrelatedToTradeReceivables
Namespace Prefix:	kfrc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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- References

No definition available.

+ Details

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