v3.25.3

Subsequent Events (Details) - USD ($) $ / shares in Units, $ in Thousands							9 Months Ended
	Nov. 03, 2025	Oct. 30, 2025	Oct. 24, 2025	Oct. 16, 2025	Oct. 08, 2025	Oct. 01, 2025	Sep. 30, 2025	Sep. 30, 2024
Subsequent Event [Line Items]
Net proceeds from share transactions (in shares)							18,950,714	12,405,490
Net proceeds from share transactions							$ 562,441	$ 364,796
Subsequent Event
Subsequent Event [Line Items]
Distributions declared per share (in dollars per share)		$ 0.25			$ 0.25
Subsequent Event \| K-FIT AB-1 Credit Facility
Subsequent Event [Line Items]
Line of credit facility, maximum borrowing capacity			$ 250	$ 250,000
Line of credit facility maximum borrowing Capacity Increase			$ 400	$ 500,000
Subsequent Event \| K-FIT AB-1 Credit Facility \| Maximum
Subsequent Event [Line Items]
Basis spread on variable rate			2.13%	2.25%
Subsequent Event \| K-FIT AB-1 Credit Facility \| Minimum
Subsequent Event [Line Items]
Basis spread on variable rate			1.85%	1.85%
Subsequent Event \| Private Placement
Subsequent Event [Line Items]
Net proceeds from share transactions (in shares)						2,235,939
Net proceeds from share transactions	$ 26,615					$ 66,765

Line Of Credit Facility Maximum Borrowing Capacity Increase

+ References

No definition available.

+ Details

Name:	kfit_LineOfCreditFacilityMaximumBorrowingCapacityIncrease
Namespace Prefix:	kfit_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Aggregate dividends declared during the period for each share of common stock outstanding.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480008/505-10-S99-1

+ Details

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Balance Type:	na
Period Type:	duration

- 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

- 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
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22)(b))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(19)(b))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Cash received on stock transaction after deduction of issuance costs.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The number of shares issued or sold by the subsidiary or equity method investee per stock transaction.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- 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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 830
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481674/830-30-50-2

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 855
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483399/855-10-50-2

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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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Period Type:

- Details

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Namespace Prefix:
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Period Type:

KKR FS Income Trust 10-Q