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Operating Leases - Narrative (Details) $ in Millions | Sep. 28, 2021 USD ($)
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Leases [Abstract] |
Operating lease not yet commenced, future lease payments | $ 10.9
Operating lease not yet commenced, term of lease | 129 months
Operating lease, not yet commenced, leasehold improvement allowance | $ 1.6

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- Definition Lessee, Operating Lease, Lease Not Yet Commenced, Leasehold Improvement Allowance + References No definition available. + Details
Name: | kfrc_LesseeOperatingLeaseLeaseNotYetCommencedLeaseholdImprovementAllowance
Namespace Prefix: | kfrc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Lessee, Operating Lease, Lease Not Yet Commenced, Undiscounted Amount + References No definition available. + Details
Name: | kfrc_LesseeOperatingLeaseLeaseNotYetCommencedUndiscountedAmount
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_LeasesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Term of lessee's operating lease not yet commenced, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=128292326&loc=SL77918673-209980 + Details
Name: | us-gaap_LesseeOperatingLeaseLeaseNotYetCommencedTermOfContract1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | instant