Document and Entity Information - shares	9 Months Ended
	Jun. 30, 2018	Aug. 01, 2018
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	2018
Document Period End Date	Jun. 30, 2018
Current Fiscal Year End Date	--09-30
Entity Filer Category	Smaller Reporting Company
Entity Common Stock, Shares Outstanding		5,820,746