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Document and Entity Information - shares
 3 Months Ended
Sep. 30, 2019
Nov. 04, 2019
Cover [Abstract]    
Document Type 10-Q  
Amendment Flag false  
Entity File Number 001-37399  
Entity Tax Identification Number 30-0870244  
Document Period End Date Sep. 30, 2019  
Document Fiscal Year Focus 2020  
Document Fiscal Period Focus Q1  
Trading Symbol KRNY  
Security Exchange Name NASDAQ  
Title of 12(b) Security Common Stock, $0.01 par value  
Entity Registrant Name Kearny Financial Corp.  
Entity Central Index Key 0001617242  
Current Fiscal Year End Date --06-30  
Entity Filer Category Large Accelerated Filer  
Entity Common Stock, Shares Outstanding   86,108,298
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Small Business false  
Entity Emerging Growth Company false  
Entity Shell Company false  
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  
Entity Incorporation, State or Country Code MD  
City Area Code 973  
Local Phone Number 244-4500  
Document Quarterly Report true  
Document Transition Report false