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ACQUISITIONS, DEVELOPMENTS PLACED IN SERVICE AND DISPOSITIONS, DEVELOPMENT PROJECTS PLACED IN SERVICE (Details) (USD $) In Thousands, unless otherwise specified | 9 Months Ended |  |  |  |
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Jan. 31, 2015 Unit | Jan. 31, 2014 | Apr. 30, 2015 | Apr. 30, 2014 | Apr. 30, 2013
Multi-Family Residential [Member] |  |  |  |  |  |  |  |  |  |
Significant Development Projects Placed in Service [Line Items] |  |  |  |  |  |  |  |  |  |
Land | $ 8,949 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLand / us-gaap_StatementBusinessSegmentsAxis = iret_MultiFamilyResidentialMember |  |  |  |  |  |  |  |  |
Building | 101,434 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBuildings / us-gaap_StatementBusinessSegmentsAxis = iret_MultiFamilyResidentialMember |  |  |  |  |  |  |  |  |
Development costs of projects placed in service | 110,383 iret_DevelopmentCostsOfProjectsPlacedInService / us-gaap_StatementBusinessSegmentsAxis = iret_MultiFamilyResidentialMember |  |  |  |  |  |  |  |  |
Development Projects Placed in Service [Member] |  |  |  |  |  |  |  |  |  |
Significant Development Projects Placed in Service [Line Items] |  |  |  |  |  |  |  |  |  |
Land | 9,941 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLand / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_DevelopmentProjectsPlacedInServiceMember | [1] | 3,987 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLand / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_DevelopmentProjectsPlacedInServiceMember |  |  |  |  |  |  |
Building | 103,627 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBuildings / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_DevelopmentProjectsPlacedInServiceMember | [1] | 49,540 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBuildings / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_DevelopmentProjectsPlacedInServiceMember |  |  |  |  |  |  |
Development costs of projects placed in service | 113,568 iret_DevelopmentCostsOfProjectsPlacedInService / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_DevelopmentProjectsPlacedInServiceMember | [1] | 53,527 iret_DevelopmentCostsOfProjectsPlacedInService / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_DevelopmentProjectsPlacedInServiceMember |  |  |  |  |  |  |
Development Projects Placed in Service [Member] | Multi-Family Residential [Member] | Dakota Commons, Williston, North Dakota [Member] |  |  |  |  |  |  |  |  |  |
Significant Development Projects Placed in Service [Line Items] |  |  |  |  |  |  |  |  |  |
Date placed in service | Jul. 15, 2014 | [1],[2] |  |  |  |  |  |  |  |
Land | 823 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLand / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_DevelopmentProjectsPlacedInServiceMember / iret_SignificantDevelopmentProjectsPlacedInServiceByTransactionAxis = iret_DakotaCommonsWillistonNorthDakotaMember / us-gaap_StatementBusinessSegmentsAxis = iret_MultiFamilyResidentialMember | [1],[2] |  |  |  |  |  |  |  |
Building | 9,596 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBuildings / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_DevelopmentProjectsPlacedInServiceMember / iret_SignificantDevelopmentProjectsPlacedInServiceByTransactionAxis = iret_DakotaCommonsWillistonNorthDakotaMember / us-gaap_StatementBusinessSegmentsAxis = iret_MultiFamilyResidentialMember | [1],[2] |  |  |  |  |  |  |  |
Development costs of projects placed in service | 10,419 iret_DevelopmentCostsOfProjectsPlacedInService / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_DevelopmentProjectsPlacedInServiceMember / iret_SignificantDevelopmentProjectsPlacedInServiceByTransactionAxis = iret_DakotaCommonsWillistonNorthDakotaMember / us-gaap_StatementBusinessSegmentsAxis = iret_MultiFamilyResidentialMember | [1],[2] |  |  | 2,300 iret_DevelopmentCostsOfProjectsPlacedInService / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_DevelopmentProjectsPlacedInServiceMember / iret_SignificantDevelopmentProjectsPlacedInServiceByTransactionAxis = iret_DakotaCommonsWillistonNorthDakotaMember / us-gaap_StatementBusinessSegmentsAxis = iret_MultiFamilyResidentialMember | [1],[2] | 8,100 iret_DevelopmentCostsOfProjectsPlacedInService / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_DevelopmentProjectsPlacedInServiceMember / iret_SignificantDevelopmentProjectsPlacedInServiceByTransactionAxis = iret_DakotaCommonsWillistonNorthDakotaMember / us-gaap_StatementBusinessSegmentsAxis = iret_MultiFamilyResidentialMember | [1],[2] |  |
Number of units | 44 iret_NumberOfApartmentUnitsAcquisitions / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_DevelopmentProjectsPlacedInServiceMember / iret_SignificantDevelopmentProjectsPlacedInServiceByTransactionAxis = iret_DakotaCommonsWillistonNorthDakotaMember / us-gaap_StatementBusinessSegmentsAxis = iret_MultiFamilyResidentialMember | [1],[2] |  |  |  |  |  |  |  |
Development Projects Placed in Service [Member] | Multi-Family Residential [Member] | Landing at Southgate - Minot, ND [Member] |  |  |  |  |  |  |  |  |  |
Significant Development Projects Placed in Service [Line Items] |  |  |  |  |  |  |  |  |  |
Date placed in service | Sep. 04, 2013 | [3] |  |  |  |  |  |  |  |
Land |  |  | 2,262 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLand / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_DevelopmentProjectsPlacedInServiceMember / iret_SignificantDevelopmentProjectsPlacedInServiceByTransactionAxis = iret_LandingAtSouthgateMinotNdMember / us-gaap_StatementBusinessSegmentsAxis = iret_MultiFamilyResidentialMember | [3] |  |  |  |  |  |
Building |  |  | 12,864 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBuildings / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_DevelopmentProjectsPlacedInServiceMember / iret_SignificantDevelopmentProjectsPlacedInServiceByTransactionAxis = iret_LandingAtSouthgateMinotNdMember / us-gaap_StatementBusinessSegmentsAxis = iret_MultiFamilyResidentialMember | [3] |  |  |  |  |  |
Development costs of projects placed in service |  |  | 15,126 iret_DevelopmentCostsOfProjectsPlacedInService / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_DevelopmentProjectsPlacedInServiceMember / iret_SignificantDevelopmentProjectsPlacedInServiceByTransactionAxis = iret_LandingAtSouthgateMinotNdMember / us-gaap_StatementBusinessSegmentsAxis = iret_MultiFamilyResidentialMember | [3] |  |  | 8,800 iret_DevelopmentCostsOfProjectsPlacedInService / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_DevelopmentProjectsPlacedInServiceMember / iret_SignificantDevelopmentProjectsPlacedInServiceByTransactionAxis = iret_LandingAtSouthgateMinotNdMember / us-gaap_StatementBusinessSegmentsAxis = iret_MultiFamilyResidentialMember | [3] | 6,300 iret_DevelopmentCostsOfProjectsPlacedInService / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_DevelopmentProjectsPlacedInServiceMember / iret_SignificantDevelopmentProjectsPlacedInServiceByTransactionAxis = iret_LandingAtSouthgateMinotNdMember / us-gaap_StatementBusinessSegmentsAxis = iret_MultiFamilyResidentialMember | [3]
Interest in development |  |  | 52.90%iret_InterestInDevelopement / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_DevelopmentProjectsPlacedInServiceMember / iret_SignificantDevelopmentProjectsPlacedInServiceByTransactionAxis = iret_LandingAtSouthgateMinotNdMember / us-gaap_StatementBusinessSegmentsAxis = iret_MultiFamilyResidentialMember | [3] |  |  |  |  |  |
Number of units |  |  | 108 iret_NumberOfApartmentUnitsAcquisitions / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_DevelopmentProjectsPlacedInServiceMember / iret_SignificantDevelopmentProjectsPlacedInServiceByTransactionAxis = iret_LandingAtSouthgateMinotNdMember / us-gaap_StatementBusinessSegmentsAxis = iret_MultiFamilyResidentialMember | [3] |  |  |  |  |  |
Development Projects Placed in Service [Member] | Multi-Family Residential [Member] | Cypress Court - St. Cloud, MN [Member] |  |  |  |  |  |  |  |  |  |
Significant Development Projects Placed in Service [Line Items] |  |  |  |  |  |  |  |  |  |
Date placed in service | Nov. 01, 2013 | [4] |  |  |  |  |  |  |  |
Land |  |  | 1,136 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLand / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_DevelopmentProjectsPlacedInServiceMember / iret_SignificantDevelopmentProjectsPlacedInServiceByTransactionAxis = iret_CypressCourtStCloudMnMember / us-gaap_StatementBusinessSegmentsAxis = iret_MultiFamilyResidentialMember | [4] |  |  |  |  |  |
Building |  |  | 12,447 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBuildings / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_DevelopmentProjectsPlacedInServiceMember / iret_SignificantDevelopmentProjectsPlacedInServiceByTransactionAxis = iret_CypressCourtStCloudMnMember / us-gaap_StatementBusinessSegmentsAxis = iret_MultiFamilyResidentialMember | [4] |  |  |  |  |  |
Development costs of projects placed in service |  |  | 13,583 iret_DevelopmentCostsOfProjectsPlacedInService / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_DevelopmentProjectsPlacedInServiceMember / iret_SignificantDevelopmentProjectsPlacedInServiceByTransactionAxis = iret_CypressCourtStCloudMnMember / us-gaap_StatementBusinessSegmentsAxis = iret_MultiFamilyResidentialMember | [4] |  |  | 7,800 iret_DevelopmentCostsOfProjectsPlacedInService / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_DevelopmentProjectsPlacedInServiceMember / iret_SignificantDevelopmentProjectsPlacedInServiceByTransactionAxis = iret_CypressCourtStCloudMnMember / us-gaap_StatementBusinessSegmentsAxis = iret_MultiFamilyResidentialMember | [4] | 5,800 iret_DevelopmentCostsOfProjectsPlacedInService / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_DevelopmentProjectsPlacedInServiceMember / iret_SignificantDevelopmentProjectsPlacedInServiceByTransactionAxis = iret_CypressCourtStCloudMnMember / us-gaap_StatementBusinessSegmentsAxis = iret_MultiFamilyResidentialMember | [4]
Interest in development |  |  | 86.10%iret_InterestInDevelopement / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_DevelopmentProjectsPlacedInServiceMember / iret_SignificantDevelopmentProjectsPlacedInServiceByTransactionAxis = iret_CypressCourtStCloudMnMember / us-gaap_StatementBusinessSegmentsAxis = iret_MultiFamilyResidentialMember | [4] |  |  |  |  |  |
Number of units |  |  | 132 iret_NumberOfApartmentUnitsAcquisitions / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_DevelopmentProjectsPlacedInServiceMember / iret_SignificantDevelopmentProjectsPlacedInServiceByTransactionAxis = iret_CypressCourtStCloudMnMember / us-gaap_StatementBusinessSegmentsAxis = iret_MultiFamilyResidentialMember | [4] |  |  |  |  |  |
Development Projects Placed in Service [Member] | Multi-Family Residential [Member] | Arcata - Golden Valley, MN [Member] |  |  |  |  |  |  |  |  |  |
Significant Development Projects Placed in Service [Line Items] |  |  |  |  |  |  |  |  |  |
Date placed in service | Jan. 01, 2015 | [1],[5] |  |  |  |  |  |  |  |
Land | 2,088 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLand / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_DevelopmentProjectsPlacedInServiceMember / iret_SignificantDevelopmentProjectsPlacedInServiceByTransactionAxis = iret_ArcataGoldenValleyMnMember / us-gaap_StatementBusinessSegmentsAxis = iret_MultiFamilyResidentialMember | [1],[5] |  |  |  |  |  |  |  |
Building | 28,296 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBuildings / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_DevelopmentProjectsPlacedInServiceMember / iret_SignificantDevelopmentProjectsPlacedInServiceByTransactionAxis = iret_ArcataGoldenValleyMnMember / us-gaap_StatementBusinessSegmentsAxis = iret_MultiFamilyResidentialMember | [1],[5] |  |  |  |  |  |  |  |
Development costs of projects placed in service | 30,384 iret_DevelopmentCostsOfProjectsPlacedInService / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_DevelopmentProjectsPlacedInServiceMember / iret_SignificantDevelopmentProjectsPlacedInServiceByTransactionAxis = iret_ArcataGoldenValleyMnMember / us-gaap_StatementBusinessSegmentsAxis = iret_MultiFamilyResidentialMember | [1],[5] |  |  | 19,100 iret_DevelopmentCostsOfProjectsPlacedInService / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_DevelopmentProjectsPlacedInServiceMember / iret_SignificantDevelopmentProjectsPlacedInServiceByTransactionAxis = iret_ArcataGoldenValleyMnMember / us-gaap_StatementBusinessSegmentsAxis = iret_MultiFamilyResidentialMember | [1],[5] | 8,600 iret_DevelopmentCostsOfProjectsPlacedInService / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_DevelopmentProjectsPlacedInServiceMember / iret_SignificantDevelopmentProjectsPlacedInServiceByTransactionAxis = iret_ArcataGoldenValleyMnMember / us-gaap_StatementBusinessSegmentsAxis = iret_MultiFamilyResidentialMember | [1],[5] | 2,700 iret_DevelopmentCostsOfProjectsPlacedInService / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_DevelopmentProjectsPlacedInServiceMember / iret_SignificantDevelopmentProjectsPlacedInServiceByTransactionAxis = iret_ArcataGoldenValleyMnMember / us-gaap_StatementBusinessSegmentsAxis = iret_MultiFamilyResidentialMember | [1],[5]
Number of units | 165 iret_NumberOfApartmentUnitsAcquisitions / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_DevelopmentProjectsPlacedInServiceMember / iret_SignificantDevelopmentProjectsPlacedInServiceByTransactionAxis = iret_ArcataGoldenValleyMnMember / us-gaap_StatementBusinessSegmentsAxis = iret_MultiFamilyResidentialMember | [1],[5] |  |  |  |  |  |  |  |
Development Projects Placed in Service [Member] | Multi-Family Residential [Member] | Commons at Southgate - Minot, ND [Member] |  |  |  |  |  |  |  |  |  |
Significant Development Projects Placed in Service [Line Items] |  |  |  |  |  |  |  |  |  |
Date placed in service | Dec. 09, 2014 | [1],[6] |  |  |  |  |  |  |  |
Land | 3,691 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLand / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_DevelopmentProjectsPlacedInServiceMember / iret_SignificantDevelopmentProjectsPlacedInServiceByTransactionAxis = iret_CommonsAtSouthgateMinotNdMember / us-gaap_StatementBusinessSegmentsAxis = iret_MultiFamilyResidentialMember | [1],[6] |  |  |  |  |  |  |  |
Building | 30,921 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBuildings / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_DevelopmentProjectsPlacedInServiceMember / iret_SignificantDevelopmentProjectsPlacedInServiceByTransactionAxis = iret_CommonsAtSouthgateMinotNdMember / us-gaap_StatementBusinessSegmentsAxis = iret_MultiFamilyResidentialMember | [1],[6] |  |  |  |  |  |  |  |
Development costs of projects placed in service | 34,612 iret_DevelopmentCostsOfProjectsPlacedInService / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_DevelopmentProjectsPlacedInServiceMember / iret_SignificantDevelopmentProjectsPlacedInServiceByTransactionAxis = iret_CommonsAtSouthgateMinotNdMember / us-gaap_StatementBusinessSegmentsAxis = iret_MultiFamilyResidentialMember | [1],[6] |  |  | 8,100 iret_DevelopmentCostsOfProjectsPlacedInService / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_DevelopmentProjectsPlacedInServiceMember / iret_SignificantDevelopmentProjectsPlacedInServiceByTransactionAxis = iret_CommonsAtSouthgateMinotNdMember / us-gaap_StatementBusinessSegmentsAxis = iret_MultiFamilyResidentialMember | [1],[6] | 20,600 iret_DevelopmentCostsOfProjectsPlacedInService / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_DevelopmentProjectsPlacedInServiceMember / iret_SignificantDevelopmentProjectsPlacedInServiceByTransactionAxis = iret_CommonsAtSouthgateMinotNdMember / us-gaap_StatementBusinessSegmentsAxis = iret_MultiFamilyResidentialMember | [1],[6] | 5,900 iret_DevelopmentCostsOfProjectsPlacedInService / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_DevelopmentProjectsPlacedInServiceMember / iret_SignificantDevelopmentProjectsPlacedInServiceByTransactionAxis = iret_CommonsAtSouthgateMinotNdMember / us-gaap_StatementBusinessSegmentsAxis = iret_MultiFamilyResidentialMember | [1],[6]
Interest in development | 52.90%iret_InterestInDevelopement / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_DevelopmentProjectsPlacedInServiceMember / iret_SignificantDevelopmentProjectsPlacedInServiceByTransactionAxis = iret_CommonsAtSouthgateMinotNdMember / us-gaap_StatementBusinessSegmentsAxis = iret_MultiFamilyResidentialMember | [1],[6] |  |  |  |  |  |  |  |
Number of units | 233 iret_NumberOfApartmentUnitsAcquisitions / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_DevelopmentProjectsPlacedInServiceMember / iret_SignificantDevelopmentProjectsPlacedInServiceByTransactionAxis = iret_CommonsAtSouthgateMinotNdMember / us-gaap_StatementBusinessSegmentsAxis = iret_MultiFamilyResidentialMember | [1],[6] |  |  |  |  |  |  |  |
Development Projects Placed in Service [Member] | Multi-Family Residential [Member] | Cypress Court II - St. Cloud, MN [Member] |  |  |  |  |  |  |  |  |  |
Significant Development Projects Placed in Service [Line Items] |  |  |  |  |  |  |  |  |  |
Date placed in service | Jan. 01, 2015 | [1],[7] |  |  |  |  |  |  |  |
Land | 447 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLand / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_DevelopmentProjectsPlacedInServiceMember / iret_SignificantDevelopmentProjectsPlacedInServiceByTransactionAxis = iret_CypressCourtIiStCloudMnMember / us-gaap_StatementBusinessSegmentsAxis = iret_MultiFamilyResidentialMember | [1],[7] |  |  |  |  |  |  |  |
Building | 6,191 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBuildings / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_DevelopmentProjectsPlacedInServiceMember / iret_SignificantDevelopmentProjectsPlacedInServiceByTransactionAxis = iret_CypressCourtIiStCloudMnMember / us-gaap_StatementBusinessSegmentsAxis = iret_MultiFamilyResidentialMember | [1],[7] |  |  |  |  |  |  |  |
Development costs of projects placed in service | 6,638 iret_DevelopmentCostsOfProjectsPlacedInService / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_DevelopmentProjectsPlacedInServiceMember / iret_SignificantDevelopmentProjectsPlacedInServiceByTransactionAxis = iret_CypressCourtIiStCloudMnMember / us-gaap_StatementBusinessSegmentsAxis = iret_MultiFamilyResidentialMember | [1],[7] |  |  | 5,500 iret_DevelopmentCostsOfProjectsPlacedInService / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_DevelopmentProjectsPlacedInServiceMember / iret_SignificantDevelopmentProjectsPlacedInServiceByTransactionAxis = iret_CypressCourtIiStCloudMnMember / us-gaap_StatementBusinessSegmentsAxis = iret_MultiFamilyResidentialMember | [1],[7] | 1,200 iret_DevelopmentCostsOfProjectsPlacedInService / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_DevelopmentProjectsPlacedInServiceMember / iret_SignificantDevelopmentProjectsPlacedInServiceByTransactionAxis = iret_CypressCourtIiStCloudMnMember / us-gaap_StatementBusinessSegmentsAxis = iret_MultiFamilyResidentialMember | [1],[7] |  |
Interest in development | 86.10%iret_InterestInDevelopement / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_DevelopmentProjectsPlacedInServiceMember / iret_SignificantDevelopmentProjectsPlacedInServiceByTransactionAxis = iret_CypressCourtIiStCloudMnMember / us-gaap_StatementBusinessSegmentsAxis = iret_MultiFamilyResidentialMember | [1],[7] |  |  |  |  |  |  |  |
Number of units | 64 iret_NumberOfApartmentUnitsAcquisitions / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_DevelopmentProjectsPlacedInServiceMember / iret_SignificantDevelopmentProjectsPlacedInServiceByTransactionAxis = iret_CypressCourtIiStCloudMnMember / us-gaap_StatementBusinessSegmentsAxis = iret_MultiFamilyResidentialMember | [1],[7] |  |  |  |  |  |  |  |
Development Projects Placed in Service [Member] | Multi-Family Residential [Member] | RED 20 - Minneapolis, MN [Member] |  |  |  |  |  |  |  |  |  |
Significant Development Projects Placed in Service [Line Items] |  |  |  |  |  |  |  |  |  |
Date placed in service | Nov. 21, 2014 | [1],[8] |  |  |  |  |  |  |  |
Land | 1,900 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLand / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_DevelopmentProjectsPlacedInServiceMember / iret_SignificantDevelopmentProjectsPlacedInServiceByTransactionAxis = iret_Red20MinneapolisMnMember / us-gaap_StatementBusinessSegmentsAxis = iret_MultiFamilyResidentialMember | [1],[8] |  |  |  |  |  |  |  |
Building | 26,430 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBuildings / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_DevelopmentProjectsPlacedInServiceMember / iret_SignificantDevelopmentProjectsPlacedInServiceByTransactionAxis = iret_Red20MinneapolisMnMember / us-gaap_StatementBusinessSegmentsAxis = iret_MultiFamilyResidentialMember | [1],[8] |  |  |  |  |  |  |  |
Development costs of projects placed in service | 28,330 iret_DevelopmentCostsOfProjectsPlacedInService / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_DevelopmentProjectsPlacedInServiceMember / iret_SignificantDevelopmentProjectsPlacedInServiceByTransactionAxis = iret_Red20MinneapolisMnMember / us-gaap_StatementBusinessSegmentsAxis = iret_MultiFamilyResidentialMember | [1],[8] |  |  | 16,100 iret_DevelopmentCostsOfProjectsPlacedInService / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_DevelopmentProjectsPlacedInServiceMember / iret_SignificantDevelopmentProjectsPlacedInServiceByTransactionAxis = iret_Red20MinneapolisMnMember / us-gaap_StatementBusinessSegmentsAxis = iret_MultiFamilyResidentialMember | [1],[8] | 12,200 iret_DevelopmentCostsOfProjectsPlacedInService / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_DevelopmentProjectsPlacedInServiceMember / iret_SignificantDevelopmentProjectsPlacedInServiceByTransactionAxis = iret_Red20MinneapolisMnMember / us-gaap_StatementBusinessSegmentsAxis = iret_MultiFamilyResidentialMember | [1],[8] |  |
Interest in development | 58.60%iret_InterestInDevelopement / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_DevelopmentProjectsPlacedInServiceMember / iret_SignificantDevelopmentProjectsPlacedInServiceByTransactionAxis = iret_Red20MinneapolisMnMember / us-gaap_StatementBusinessSegmentsAxis = iret_MultiFamilyResidentialMember | [1],[8] |  |  |  |  |  |  |  |
Number of units | 130 iret_NumberOfApartmentUnitsAcquisitions / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_DevelopmentProjectsPlacedInServiceMember / iret_SignificantDevelopmentProjectsPlacedInServiceByTransactionAxis = iret_Red20MinneapolisMnMember / us-gaap_StatementBusinessSegmentsAxis = iret_MultiFamilyResidentialMember | [1],[8] |  |  |  |  |  |  |  |
Development Projects Placed in Service [Member] | Multi-Family Residential [Member] | River Ridge - Bismarck, ND [Member] |  |  |  |  |  |  |  |  |  |
Significant Development Projects Placed in Service [Line Items] |  |  |  |  |  |  |  |  |  |
Date placed in service | Dec. 02, 2013 | [9] |  |  |  |  |  |  |  |
Land |  |  | 589 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLand / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_DevelopmentProjectsPlacedInServiceMember / iret_SignificantDevelopmentProjectsPlacedInServiceByTransactionAxis = iret_RiverRidgeBismarckNdMember / us-gaap_StatementBusinessSegmentsAxis = iret_MultiFamilyResidentialMember | [9] |  |  |  |  |  |
Building |  |  | 24,229 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBuildings / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_DevelopmentProjectsPlacedInServiceMember / iret_SignificantDevelopmentProjectsPlacedInServiceByTransactionAxis = iret_RiverRidgeBismarckNdMember / us-gaap_StatementBusinessSegmentsAxis = iret_MultiFamilyResidentialMember | [9] |  |  |  |  |  |
Development costs of projects placed in service |  |  | 24,818 iret_DevelopmentCostsOfProjectsPlacedInService / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_DevelopmentProjectsPlacedInServiceMember / iret_SignificantDevelopmentProjectsPlacedInServiceByTransactionAxis = iret_RiverRidgeBismarckNdMember / us-gaap_StatementBusinessSegmentsAxis = iret_MultiFamilyResidentialMember | [9] |  |  | 14,700 iret_DevelopmentCostsOfProjectsPlacedInService / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_DevelopmentProjectsPlacedInServiceMember / iret_SignificantDevelopmentProjectsPlacedInServiceByTransactionAxis = iret_RiverRidgeBismarckNdMember / us-gaap_StatementBusinessSegmentsAxis = iret_MultiFamilyResidentialMember | [9] | 10,100 iret_DevelopmentCostsOfProjectsPlacedInService / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_DevelopmentProjectsPlacedInServiceMember / iret_SignificantDevelopmentProjectsPlacedInServiceByTransactionAxis = iret_RiverRidgeBismarckNdMember / us-gaap_StatementBusinessSegmentsAxis = iret_MultiFamilyResidentialMember | [9]
Number of units |  |  | 146 iret_NumberOfApartmentUnitsAcquisitions / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_DevelopmentProjectsPlacedInServiceMember / iret_SignificantDevelopmentProjectsPlacedInServiceByTransactionAxis = iret_RiverRidgeBismarckNdMember / us-gaap_StatementBusinessSegmentsAxis = iret_MultiFamilyResidentialMember | [9] |  |  |  |  |  |
Development Projects Placed in Service [Member] | Commercial Retail [Member] | Minot Wells Fargo Bank - Minot, ND [Member] |  |  |  |  |  |  |  |  |  |
Significant Development Projects Placed in Service [Line Items] |  |  |  |  |  |  |  |  |  |
Land | 992 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLand / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_DevelopmentProjectsPlacedInServiceMember / iret_SignificantDevelopmentProjectsPlacedInServiceByTransactionAxis = iret_MinotWellsFargoBankMinotNdMember / us-gaap_StatementBusinessSegmentsAxis = iret_CommercialRetailMember | [1],[10] |  |  |  |  |  |  |  |
Building | 2,193 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBuildings / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_DevelopmentProjectsPlacedInServiceMember / iret_SignificantDevelopmentProjectsPlacedInServiceByTransactionAxis = iret_MinotWellsFargoBankMinotNdMember / us-gaap_StatementBusinessSegmentsAxis = iret_CommercialRetailMember | [1],[10] |  |  |  |  |  |  |  |
Development costs of projects placed in service | $ 3,185 iret_DevelopmentCostsOfProjectsPlacedInService / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_DevelopmentProjectsPlacedInServiceMember / iret_SignificantDevelopmentProjectsPlacedInServiceByTransactionAxis = iret_MinotWellsFargoBankMinotNdMember / us-gaap_StatementBusinessSegmentsAxis = iret_CommercialRetailMember | [1],[10] |  |  |  |  |  |  |  |
Number of units | 4,998 iret_NumberOfApartmentUnitsAcquisitions / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_DevelopmentProjectsPlacedInServiceMember / iret_SignificantDevelopmentProjectsPlacedInServiceByTransactionAxis = iret_MinotWellsFargoBankMinotNdMember / us-gaap_StatementBusinessSegmentsAxis = iret_CommercialRetailMember | [1],[10] |  |  |  |  |  |  |  |
[1] | Development projects that are placed in service in phases are excluded from this table until the entire project has been placed in service. See Note 6 for additional information on the Renaissance Heights I project, which was partially placed in service during the fiscal year 2014 and the nine months ended January 31, 2015.
[2] | Costs paid in prior fiscal years totaled $8.1 million. Additional costs paid in fiscal year 2015 totaled $2.3 million, for a total project cost at January 31, 2015 of $10.4 million.
[3] | Costs paid in prior fiscal years totaled $6.3 million. Costs paid in fiscal year 2014 totaled $8.8 million for a total project cost at January 31, 2014 of $15.1 million. The project is owned by a joint venture entity in which the Company has an approximately 52.9% interest.
[4] | Costs paid in prior fiscal years totaled $5.8 million. Costs paid in fiscal year 2014 totaled $7.8 million for a total project cost at January 31, 2014 of $13.6 million. The project is owned by a joint venture entity in which the Company has an approximately 86.1% interest.
[5] | Costs paid in prior fiscal years totaled $11.3 million, respectively. Additional costs paid in fiscal year 2015 totaled $19.1 million, for a total project cost at January 31, 2015 of $30.4 million.
[6] | Costs paid in prior fiscal years totaled $26.5 million, respectively. Additional costs paid in fiscal year 2015 totaled $8.1 million, for a total project cost at January 31, 2015 of $34.6 million. The project is owned by a joint venture entity in which the Company has an approximately 52.9% interest. The joint venture is consolidated in IRETs financial statements.
[7] | Costs paid in prior fiscal years totaled $1.2 million. Additional costs paid in fiscal year 2015 totaled $5.5 million, for a total project cost at January 31, 2015 of $6.6 million. The project is owned by a joint venture entity in which the Company has an approximately 86.1% interest. The joint venture is consolidated in IRETs financial statements
[8] | Costs paid in prior fiscal years totaled $12.2 million. Additional costs paid in fiscal year 2015 totaled $16.1 million, for a total project cost at January 31, 2015 of $28.3 million. The project is owned by a joint venture entity in which the Company has an approximately 58.6% interest. The joint venture is consolidated in IRETs financial statements.
[9] | Costs paid in prior fiscal years totaled $10.1 million. Costs paid in fiscal year 2014 totaled $14.7 million for a total project cost at January 31, 2014 of $24.8 million.
[10] | Costs paid in fiscal year 2015 totaled $3.2 million, including land acquired in fiscal year 2013.

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