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ORGANIZATION (Details) ft² in Millions | Jul. 31, 2017 ft² item property
--- | ---
Medical Property [Member] |
Real Estate Properties [Line Items] |
Number of real estate properties | 29
Medical Property [Member] | Discontinued Operations, Held-for-sale [Member] |
Real Estate Properties [Line Items] |
Number of real estate properties | 2
Retail [Member] | Discontinued Operations, Held-for-sale [Member] |
Real Estate Properties [Line Items] |
Number of real estate properties | 1
Other Property [Member] |
Real Estate Properties [Line Items] |
Number of real estate properties | 13
Multi-family Residential Properties [Member] |
Real Estate Properties [Line Items] |
Number of real estate properties | 88
Number of apartment units | item | 13,076
Net rentable area (in square feet) | ft² | 2.6
Multi-family Residential Properties [Member] | Discontinued Operations, Held-for-sale [Member] |
Real Estate Properties [Line Items] |
Number of real estate properties | 13
Unimproved Land [Member] | Discontinued Operations, Held-for-sale [Member] |
Real Estate Properties [Line Items] |
Number of real estate properties | 1

X
- 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
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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
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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

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- Details
Name: | us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis=iret_MedicalPropertyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DisposalGroupClassificationAxis=us-gaap_DiscontinuedOperationsHeldforsaleMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
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- Details
Name: | us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis=us-gaap_RetailSiteMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis=us-gaap_OtherPropertyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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