XML 12 R1.htm IDEA: XBRL DOCUMENT v3.21.4
Document and Entity Information - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2021
Dec. 15, 2021
Mar. 31, 2021
Cover [Abstract]      
Entity Central Index Key 0001337068    
Current Fiscal Year End Date --09-30    
Document Fiscal Year Focus 2021    
Document Fiscal Period Focus FY    
Amendment Flag false    
Document Type 10-K    
Document Annual Report true    
Document Period End Date Sep. 30, 2021    
Document Transition Report false    
Entity File Number 000-51726    
Entity Registrant Name Magyar Bancorp, Inc.    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 20-4154978    
Entity Address, Address Line One 400 Somerset Street    
Entity Address, City or Town New Brunswick    
Entity Address, State or Province NJ    
Entity Address, Postal Zip Code 08901    
City Area Code 732    
Local Phone Number 342-7600    
Title of 12(b) Security Common Stock, par value $0.01 per share    
Trading Symbol MGYR    
Name of Exchange on which Security is Registered NASDAQ    
Is Entity a Well-known Seasoned Issuer? No    
Is Entity a Voluntary Filer? No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Non-accelerated Filer    
Entity Small Business true    
Entity Emerging Growth Company false    
Auditor Attestation Flag false    
Entity Shell Company false    
Entity Public Float     $ 79.9
Entity Common Stock, Shares Outstanding   7,097,825