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Organization and Background	9 Months Ended
Organization and Background	Jun. 30, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization and Background	Organization and Background BRT Apartments Corp. (the "Company"), a Maryland corporation, owns, operates and develops multi-family properties. The Company conducts its operations to qualify as a real estate investment trust, or REIT, for federal income tax purposes. Generally, the multi-family properties are acquired with joint venture partners in transactions in which the Company contributes a significant portion of the equity. At June 30, 2018, the Company owns: (a) 36 multi-family properties with 10,121 units (including 402 units at a property under development), located in 11 states with a carrying value of $1,044,063,000; and (b) interests in three unconsolidated multi-family joint ventures with a carrying value of $20,328,000.