XML 12 R1.htm IDEA: XBRL DOCUMENT v3.7.0.1
Document and Entity Information - shares
 9 Months Ended
Jun. 30, 2017
Aug. 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 Q3  
Document Fiscal Year Focus 2017  
Document Period End Date Jun. 30, 2017  
Current Fiscal Year End Date --09-30  
Entity Filer Category Smaller Reporting Company  
Entity Common Stock, Shares Outstanding   5,820,746