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Document and Entity Information - shares
 6 Months Ended
Mar. 31, 2017
May 01, 2017
Document and Entity Information [Abstract]    
Entity Registrant Name Magyar Bancorp, Inc.  
Entity Central Index Key 0001337068  
Amendment Flag false  
Document Type 10-Q  
Document Fiscal Period Focus Q2  
Document Fiscal Year Focus 2017  
Document Period End Date Mar. 31, 2017  
Current Fiscal Year End Date --09-30  
Entity Well-known Seasoned Issuer No  
Entity Voluntary Filers No  
Entity Current Reporting Status Yes  
Entity Filer Category Smaller Reporting Company  
Entity Common Stock, Shares Outstanding   5,820,746