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Subsequent Events (Details) - Subsequent Event - Credit Facility - Revolving Credit Facility | Oct. 20, 2021 USD ($) Rate
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Subsequent Event [Line Items] |
Initial maximum borrowing capacity | $ 200,000,000
Aggregate additional amount of increase (up to) | $ 150,000,000
Reserve-adjusted LIBOR rate, period minimum | 0.00%
Ability to repurchase equity securities under the debt covenants (in excess of) | $ 25,000,000
Leverage ratio under debt covenants, threshold | Rate | 300.00%
Availability of unrestricted cash (less than) | $ 25,000,000
Minimum |
Subsequent Event [Line Items] |
Commitment fee percentage | 0.20%
Minimum fixed charge coverage ratio | Rate | 125.00%
Maximum |
Subsequent Event [Line Items] |
Commitment fee percentage | 0.30%
Maximum total leverage ratio | Rate | 350.00%
LIBOR |
Subsequent Event [Line Items] |
Interest rate | 1.00%
LIBOR | Minimum |
Subsequent Event [Line Items] |
Interest rate | 1.125%
LIBOR | Maximum |
Subsequent Event [Line Items] |
Interest rate | 1.50%
Base Rate |
Subsequent Event [Line Items] |
Interest rate | 0.50%
Base Rate | Minimum |
Subsequent Event [Line Items] |
Interest rate | 0.125%
Base Rate | Maximum |
Subsequent Event [Line Items] |
Interest rate | 0.50%

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- Definition Debt Instrument, Interest Rate, Variable , Interest Rate Floor + References No definition available. + Details
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Namespace Prefix: | kfrc_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Line Of Credit, Accordion Feature, Increase Limit + References No definition available. + Details
Name: | kfrc_LineOfCreditAccordionFeatureIncreaseLimit
Namespace Prefix: | kfrc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Line Of Credit Facility, Covenant Terms, Fixed Charge Coverage Ratio + References No definition available. + Details
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Namespace Prefix: | kfrc_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | instant

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- Definition Line Of Credit Facility, Covenant Terms, Leverage Ratio + References No definition available. + Details
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Namespace Prefix: | kfrc_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | instant

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- Definition Line Of Credit Facility, Debt Covenant, Leverage Ratio Threshold + References No definition available. + Details
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Namespace Prefix: | kfrc_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | instant

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- Definition Line of Credit Facility, Debt Covenant, Repurchase Of Equity Securities + References No definition available. + Details
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Namespace Prefix: | kfrc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Line Of Credit Facility, Debt Covenant, Threshold, Unrestricted Cash + References No definition available. + Details
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Namespace Prefix: | kfrc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
Name: | us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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- Details
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Period Type: |

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- Details
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Period Type: |

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- Details
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- Details
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- Details
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Namespace Prefix: |
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- Details
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Period Type: |