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Summary of Significant Accounting Policies (Details) - Schedule of Loans Outstanding - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2024	Mar. 31, 2023
Schedule of Loans Outstanding [Abstract]
Outstanding principal, beginning of year	$ 480	$ 688
Changes in composition of related parties	338
Principal disbursed during the year	194
Principal repaid and refinanced during the year	(33)	(208)
Outstanding principal, end of year	$ 979	$ 480

X

- Definition

Amount of changes in composition of related parties.

+ References

No definition available.

+ Details

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Namespace Prefix:	kffb_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Amount of principal disbursed during the year.

+ References

No definition available.

+ Details

Name:	kffb_PrincipalDisbursedDuringTheYear
Namespace Prefix:	kffb_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Amount of principal repaid and refinanced during the year.

+ References

No definition available.

+ Details

Name:	kffb_PrincipalRepaidAndRefinancedDuringTheYear
Namespace Prefix:	kffb_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

This is the principal amount outstanding for securitized loans only (across all types of loans).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 50
-Subparagraph (a)
-Paragraph 4
-SubTopic 20
-Topic 860
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481326/860-20-50-4

+ Details

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

X

- References

No definition available.

+ Details

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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration