v3.25.4

Cover - shares	6 Months Ended
Cover - shares	Dec. 31, 2025	Jan. 31, 2026
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Dec. 31, 2025
Document Transition Report	false
Entity File Number	001-37399
Entity Registrant Name	KEARNY FINANCIAL CORP.
Entity Incorporation, State or Country Code	MD
Entity Tax Identification Number	30-0870244
Entity Address, Address Line One	120 Passaic Ave.
Entity Address, City or Town	Fairfield
Entity Address, State or Province	NJ
Entity Address, Postal Zip Code	07004
City Area Code	973
Local Phone Number	244-4500
Title of 12(b) Security	Common Stock, $0.01 par value
Trading Symbol	KRNY
Security Exchange Name	NASDAQ
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		64,739,151
Current Fiscal Year End Date	--06-30
Document Fiscal Year Focus	2026
Document Fiscal Period Focus	Q2
Entity Central Index Key	0001617242
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Kearny Financial Corp. 10-Q