Document and Entity Information - shares	9 Months Ended
	Jun. 30, 2017	Aug. 05, 2017
Document and Entity Information
Entity Registrant Name	BRT Apartments Corp.
Entity Central Index Key	0000014846
Current Fiscal Year End Date	--09-30
Entity Filer Category	Accelerated Filer
Document Type	10-Q
Document Period End Date	Jun. 30, 2017
Document Fiscal Year Focus	2017
Document Fiscal Period Focus	Q3
Amendment Flag	false
Entity Common Stock, Shares Outstanding (in shares)		14,025,031