XML 12 R1.htm IDEA: XBRL DOCUMENT v3.10.0.1
Document and Entity Information - shares
 3 Months Ended
Dec. 31, 2018
Feb. 01, 2019
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 Q1  
Document Fiscal Year Focus 2019  
Document Period End Date Dec. 31, 2018  
Current Fiscal Year End Date --09-30  
Entity Filer Category Non-accelerated Filer  
Entity Small Business true  
Entity Emerging Growth Company false  
Entity Common Stock, Shares Outstanding   5,820,746