Represents the contract purchase of the real estate investment property.

No definition available.

Name:	brt_RealEstateInvestmentPropertyContractPurchasePrice
Namespace Prefix:	brt_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

This element represents acquisition-related costs incurred in connection with real estate investments acquired other than through foreclosure which costs have been expensed during the period.

+ References

No definition available.

+ Details

Name:	brt_RealEstateOtherAcquisitionsCostsExpensed
Namespace Prefix:	brt_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Area of land held.

+ References

No definition available.

+ Details

Name:	us-gaap_AreaOfLand
Namespace Prefix:	us-gaap_
Data Type:	num:areaItemType
Balance Type:	na
Period Type:	instant

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399

+ Details

Name:	us-gaap_DebtInstrumentFaceAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The number of units in a real estate property owned as of the balance sheet date.

+ References

No definition available.

+ Details

Name:	us-gaap_NumberOfUnitsInRealEstateProperty
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

The cash outflow associated with the investment in or advances to an entity in which the reporting entity shares control of the entity with another party or group.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3213-108585

+ Details

Name:	us-gaap_PaymentsToAcquireInterestInJointVenture
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_RealEstatePropertiesLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of the Variable Interest Entity's (VIE) voting interest owned by (or beneficial interest in) the reporting entity (directly or indirectly).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 5A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=64801991&loc=SL6759159-111685

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	dei_LegalEntityAxis=us-gaap_CorporateJointVentureMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis=us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis=us-gaap_ApartmentBuildingMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_TypeOfArrangementAxis=brt_PropertyAcquisitionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=us-gaap_MortgagesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementGeographicalAxis=brt_CharlestonSCMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementGeographicalAxis=brt_LaGrangeGAMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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- Details

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- Details

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Acquisitions, Dispositions - Schedule of Property Acquisitions (Details)						3 Months Ended		6 Months Ended
	Feb. 29, 2016 USD ($) property_unit	Feb. 01, 2016 USD ($) property_unit	Jan. 22, 2016 USD ($) property_unit	Nov. 18, 2015 USD ($) property_unit	Oct. 13, 2015 USD ($) a property_unit	Mar. 31, 2016 USD ($) property_unit	Mar. 31, 2015 USD ($)	Mar. 31, 2016 USD ($) property_unit	Mar. 31, 2015 USD ($)
Real Estate Properties
No. of Units \| property_unit						8,793		8,793
Property Acquisition Cost						$ 953,000	$ 0	$ 1,010,000	$ 295,000
Corporate Joint Venture [Member] \| Variable Interest Entity, Primary Beneficiary [Member] \| Multi-family [Member] \| Property Acquisition [Member]
Real Estate Properties
No. of Units \| property_unit						1,407		1,407
Contract Purchase Price						$ 116,200,000		$ 116,200,000
Initial BRT Equity								30,638,000
Property Acquisition Cost								1,010,000
Corporate Joint Venture [Member] \| Variable Interest Entity, Primary Beneficiary [Member] \| Multi-family [Member] \| Property Acquisition [Member] \| Mortgages [Member]
Real Estate Properties
Acquisition Mortgage Debt						$ 86,001,000		$ 86,001,000
Corporate Joint Venture [Member] \| Variable Interest Entity, Primary Beneficiary [Member] \| Charleston, SC [Member] \| Multi-family [Member]
Real Estate Properties
Acres of land \| a					41.5
Corporate Joint Venture [Member] \| Variable Interest Entity, Primary Beneficiary [Member] \| Charleston, SC [Member] \| Multi-family [Member] \| Property Acquisition [Member]
Real Estate Properties
No. of Units \| property_unit					271
Contract Purchase Price					$ 3,625,000
Initial BRT Equity					$ 6,558,000
Interest in joint venture (as a percent)					65.00%
Property Acquisition Cost					$ 0
Corporate Joint Venture [Member] \| Variable Interest Entity, Primary Beneficiary [Member] \| Charleston, SC [Member] \| Multi-family [Member] \| Property Acquisition [Member] \| Mortgages [Member]
Real Estate Properties
Acquisition Mortgage Debt					$ 0
Corporate Joint Venture [Member] \| Variable Interest Entity, Primary Beneficiary [Member] \| La Grange, GA [Member] \| Multi-family [Member] \| Property Acquisition [Member]
Real Estate Properties
No. of Units \| property_unit				236
Contract Purchase Price				$ 22,800,000
Initial BRT Equity				$ 6,824,000
Interest in joint venture (as a percent)				100.00%
Property Acquisition Cost				$ 57,000
Corporate Joint Venture [Member] \| Variable Interest Entity, Primary Beneficiary [Member] \| La Grange, GA [Member] \| Multi-family [Member] \| Property Acquisition [Member] \| Mortgages [Member]
Real Estate Properties
Acquisition Mortgage Debt				$ 16,051,000
Corporate Joint Venture [Member] \| Variable Interest Entity, Primary Beneficiary [Member] \| Katy, TX [Member] \| Multi-family [Member] \| Property Acquisition [Member]
Real Estate Properties
No. of Units \| property_unit			268
Contract Purchase Price			$ 40,250,000
Initial BRT Equity			$ 8,150,000
Interest in joint venture (as a percent)			75.00%
Property Acquisition Cost			$ 382,000
Corporate Joint Venture [Member] \| Variable Interest Entity, Primary Beneficiary [Member] \| Katy, TX [Member] \| Multi-family [Member] \| Property Acquisition [Member] \| Mortgages [Member]
Real Estate Properties
Acquisition Mortgage Debt			$ 30,750,000
Corporate Joint Venture [Member] \| Variable Interest Entity, Primary Beneficiary [Member] \| Macon, GA [Member] \| Multi-family [Member] \| Property Acquisition [Member]
Real Estate Properties
No. of Units \| property_unit		240
Contract Purchase Price		$ 14,525,000
Initial BRT Equity		$ 3,250,000
Interest in joint venture (as a percent)		80.00%
Property Acquisition Cost		$ 158,000
Corporate Joint Venture [Member] \| Variable Interest Entity, Primary Beneficiary [Member] \| Macon, GA [Member] \| Multi-family [Member] \| Property Acquisition [Member] \| Mortgages [Member]
Real Estate Properties
Acquisition Mortgage Debt		$ 11,200,000
Corporate Joint Venture [Member] \| Variable Interest Entity, Primary Beneficiary [Member] \| Southaven, MS [Member] \| Multi-family [Member] \| Property Acquisition [Member]
Real Estate Properties
No. of Units \| property_unit	392
Contract Purchase Price	$ 35,000,000
Initial BRT Equity	$ 5,856,000
Interest in joint venture (as a percent)	60.00%
Property Acquisition Cost	$ 413,000
Corporate Joint Venture [Member] \| Variable Interest Entity, Primary Beneficiary [Member] \| Southaven, MS [Member] \| Multi-family [Member] \| Property Acquisition [Member] \| Mortgages [Member]
Real Estate Properties
Acquisition Mortgage Debt	$ 28,000,000