Basis of Preparation	3 Months Ended
Dec. 31, 2014
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Preparation	Basis of Preparation The accompanying interim unaudited consolidated financial statements as of December 31, 2014, and for the three months ended December 31, 2014 and 2013, reflect all normal recurring adjustments which are, in the opinion of management, necessary for a fair presentation of the results for such interim periods. The results of operations for the three months ended December 31, 2014, are not necessarily indicative of the results for the full year. The consolidated balance sheet as of September 30, 2014, has been derived from the audited financial statements at that date but does not include all the information and footnotes required by accounting principles generally accepted in the United States for complete financial statements. The consolidated financial statements include the accounts and operations of BRT Realty Trust, its wholly owned subsidiaries, and its majority owned or controlled real estate entities and its interests in variable interest entities in which the Trust is determined to be the primary beneficiary. Material intercompany balances and transactions have been eliminated. RBH‑TRB Newark Holdings LLC, referred to herein as the Newark Joint Venture, was determined to be a variable interest entity (“VIE”) because the total equity investment at risk is not sufficient to permit it to finance its activities without additional subordinated financial support by its equity holders. The Trust was determined to be the primary beneficiary of this joint venture because it has a controlling interest in that it has the power to direct the activities of the VIE that most significantly impact the entity’s economic performance and it has the obligation to absorb losses of the entity and the right to receive benefits from the entity that could potentially be significant to the VIE. The Trust’s consolidated joint ventures that own multi‑family properties, other than the joint venture which owns a multi-family property in Kennesaw, GA were determined to be VIE’s because the voting rights of some equity investors are not proportional to their obligations to absorb the expected losses of the entity and their right to receive the expected residual returns. In addition substantially all of the entity’s activities either involved or are conducted on behalf of the investor that has disproportionately fewer voting rights, it was determined that the Trust is the primary beneficiary of these joint ventures because it has a controlling interest in that it has the power to direct the activities of the VIE that most significantly impact the entity’s economic performance and it has the obligation to absorb losses of the entity and the right to receive benefits from the entity that could potentially be significant to the VIE. The joint venture that owns the Kennesaw, GA property was determined not to be a VIE but is consolidated because the Trust has substantive participating rights in the entity giving it a controlling financial interest in the entity. With respect to its unconsolidated joint ventures, as (i) the Trust is primarily the managing member but does not exercise substantial operating control over these entities or the Trust is not the managing member and (ii) such entities are not VIE’s, the Trust has determined that such joint ventures should be accounted for under the equity method of accounting for financial statement purposes. The preparation of the financial statements in conformity with accounting principles generally accepted in the United States requires management to make estimates and assumptions that affect the amounts reported in the consolidated financial statements. Actual results could differ from those estimates.

Basis of Preparation

The accompanying interim unaudited consolidated financial statements as of December 31, 2014, and for the three months ended December 31, 2014 and 2013, reflect all normal recurring adjustments which are, in the opinion of management, necessary for a fair presentation of the results for such interim periods. The results of operations for the three months ended December 31, 2014, are not necessarily indicative of the results for the full year. The consolidated balance sheet as of September 30, 2014, has been derived from the audited financial statements at that date but does not include all the information and footnotes required by accounting principles generally accepted in the United States for complete financial statements.

The consolidated financial statements include the accounts and operations of BRT Realty Trust, its wholly owned subsidiaries, and its majority owned or controlled real estate entities and its interests in variable interest entities in which the Trust is determined to be the primary beneficiary. Material intercompany balances and transactions have been eliminated.

RBH‑TRB Newark Holdings LLC, referred to herein as the Newark Joint Venture, was determined to be a variable interest entity (“VIE”) because the total equity investment at risk is not sufficient to permit it to finance its activities without additional subordinated financial support by its equity holders. The Trust was determined to be the primary beneficiary of this joint venture because it has a controlling interest in that it has the power to direct the activities of the VIE that most significantly impact the entity’s economic performance and it has the obligation to absorb losses of the entity and the right to receive benefits from the entity that could potentially be significant to the VIE.

The Trust’s consolidated joint ventures that own multi‑family properties, other than the joint venture which owns a multi-family property in Kennesaw, GA were determined to be VIE’s because the voting rights of some equity investors are not proportional to their obligations to absorb the expected losses of the entity and their right to receive the expected residual returns. In addition substantially all of the entity’s activities either involved or are conducted on behalf of the investor that has disproportionately fewer voting rights, it was determined that the Trust is the primary beneficiary of these joint ventures because it has a controlling interest in that it has the power to direct the activities of the VIE that most significantly impact the entity’s economic performance and it has the obligation to absorb losses of the entity and the right to receive benefits from the entity that could potentially be significant to the VIE.

The joint venture that owns the Kennesaw, GA property was determined not to be a VIE but is consolidated because the Trust has substantive participating rights in the entity giving it a controlling financial interest in the entity.

With respect to its unconsolidated joint ventures, as (i) the Trust is primarily the managing member but does not exercise substantial operating control over these entities or the Trust is not the managing member and (ii) such entities are not VIE’s, the Trust has determined that such joint ventures should be accounted for under the equity method of accounting for financial statement purposes.

The preparation of the financial statements in conformity with accounting principles generally accepted in the United States requires management to make estimates and assumptions that affect the amounts reported in the consolidated financial statements. Actual results could differ from those estimates.