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ORGANIZATION (Details) | Jan. 31, 2015
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ORGANIZATION [Abstract] |
Percentage of ordinary taxable income that must be distributed to shareholders (in hundredths) | 90.00%iret_PercentageOfOrdinaryTaxableIncomeThatMustBeDistributedToShareholders
Multi-family residential properties [Member] |
Real Estate Properties [Line Items] |
Number of real estate properties | 99 us-gaap_NumberOfRealEstateProperties / us-gaap_RealEstatePropertiesAxis = us-gaap_ResidentialRealEstateMember
Number of apartment units owned | 11,765 us-gaap_NumberOfUnitsInRealEstateProperty / us-gaap_RealEstatePropertiesAxis = us-gaap_ResidentialRealEstateMember
Commercial properties [Member] |
Real Estate Properties [Line Items] |
Number of real estate properties | 160 us-gaap_NumberOfRealEstateProperties / us-gaap_RealEstatePropertiesAxis = us-gaap_CommercialRealEstateMember
Net rentable area (in square feet) | 9.8 us-gaap_NetRentableArea / us-gaap_RealEstatePropertiesAxis = us-gaap_CommercialRealEstateMember

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- Definition The percentage of ordinary taxable income that the entity is required to distribute to shareholders. + References No definition available. + Details
Name: | iret_PercentageOfOrdinaryTaxableIncomeThatMustBeDistributedToShareholders
Namespace Prefix: | iret_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Net rentable area for properties owned. + References No definition available. + Details
Name: | us-gaap_NetRentableArea
Namespace Prefix: | us-gaap_
Data Type: | num:areaItemType
Balance Type: | na
Period Type: | instant

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- Definition The number of real estate properties owned as of the balance sheet date. + References No definition available. + Details
Name: | us-gaap_NumberOfRealEstateProperties
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- 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

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- Details
Name: | us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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

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- Details
Name: | us-gaap_RealEstatePropertiesAxis=us-gaap_CommercialRealEstateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_RealEstatePropertiesAxis=us-gaap_ResidentialRealEstateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |