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BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES, GOODWILL AND INTANGIBLES (Details) (USD $) | 9 Months Ended | 12 Months Ended | 3 Months Ended
--- | --- | --- | ---
Jan. 31, 2015 | Jan. 31, 2014 | Apr. 30, 2014 | Jan. 31, 2015 | Jan. 31, 2014
IDENTIFIED INTANGIBLE ASSETS AND INTANGIBLE LIABILITIES AND GOODWILL [Abstract] |  |  |  |  |
New intangible assets | $ 365,000 us-gaap_FinitelivedIntangibleAssetsAcquired1 | $ 900,000 us-gaap_FinitelivedIntangibleAssetsAcquired1 |  |  |
Addition to intangible liabilities | 0 iret_AdditionToIntangibleLiabilities | 0 iret_AdditionToIntangibleLiabilities |  |  |
Weighted average lives of intangible assets and intangible liabilities | 0 years 6 months | 0 years 8 months 12 days |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Finite-Lived Intangible Assets, Gross, Total | 53,898,000 us-gaap_FiniteLivedIntangibleAssetsGross |  | 56,710,000 us-gaap_FiniteLivedIntangibleAssetsGross | 53,898,000 us-gaap_FiniteLivedIntangibleAssetsGross |
Finite-Lived Intangible Assets, Accumulated Amortization | (25,423,000)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization |  | (24,071,000)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization | (25,423,000)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization |
Finite-Lived Intangible Assets, Net, Total | 28,475,000 us-gaap_FiniteLivedIntangibleAssetsNet |  | 32,639,000 us-gaap_FiniteLivedIntangibleAssetsNet | 28,475,000 us-gaap_FiniteLivedIntangibleAssetsNet |
Indentified intangible liabilities, gross | 134,000 iret_IndentifiedIntangibleLiabilitiesGross |  | 173,000 iret_IndentifiedIntangibleLiabilitiesGross | 134,000 iret_IndentifiedIntangibleLiabilitiesGross |
Indentified intangible liabilities, accumulated amortization | (107,000)iret_IndentifiedIntangibleLiabilitiesAccumulatedAmortization |  | (127,000)iret_IndentifiedIntangibleLiabilitiesAccumulatedAmortization | (107,000)iret_IndentifiedIntangibleLiabilitiesAccumulatedAmortization |
Indentified intangible liabilities, net | 27,000 iret_IndentifiedIntangibleLiabilitiesNet |  | 46,000 iret_IndentifiedIntangibleLiabilitiesNet | 27,000 iret_IndentifiedIntangibleLiabilitiesNet |
Estimated annual amortization [Abstract] |  |  |  |  |
Goodwill | 1,940,000 us-gaap_Goodwill |  | 1,100,000 us-gaap_Goodwill | 1,940,000 us-gaap_Goodwill |
Goodwill impairment | 0 us-gaap_GoodwillImpairmentLoss |  | 0 us-gaap_GoodwillImpairmentLoss |  |
Goodwill derecognized | 11,000 us-gaap_GoodwillWrittenOffRelatedToSaleOfBusinessUnit | 7,000 us-gaap_GoodwillWrittenOffRelatedToSaleOfBusinessUnit | 0 us-gaap_GoodwillWrittenOffRelatedToSaleOfBusinessUnit |  |
Goodwill added | 852,000 us-gaap_GoodwillAcquiredDuringPeriod |  |  |  |
Multi Family Residential [Member] |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Number of real estate properties sold |  |  | 2 iret_NumberOfRealEstatePropertiesSold / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = iret_MultiFamilyResidentialMember |  |
Commercial Office [Member] |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Number of real estate properties sold |  |  | 3 iret_NumberOfRealEstatePropertiesSold / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = iret_CommercialOfficeMember |  |
Commercial Industrial [Member] |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Number of real estate properties sold |  |  | 12 iret_NumberOfRealEstatePropertiesSold / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = iret_CommercialIndustrialMember |  |
Commercial Retail Property [Member] |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Number of real estate properties sold |  |  | 3 iret_NumberOfRealEstatePropertiesSold / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_RetailSiteMember |  |
Acquired below-market leases and acquired above-market leases [Member] |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Amortization of Intangible Assets | 19,000 us-gaap_AmortizationOfIntangibleAssets / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_LeasesAcquiredInPlaceMember | 32,000 us-gaap_AmortizationOfIntangibleAssets / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_LeasesAcquiredInPlaceMember |  | 6,000 us-gaap_AmortizationOfIntangibleAssets / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_LeasesAcquiredInPlaceMember | 11,000 us-gaap_AmortizationOfIntangibleAssets / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_LeasesAcquiredInPlaceMember
Estimated annual amortization [Abstract] |  |  |  |  |
2016 |  |  | 20,000,000 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_LeasesAcquiredInPlaceMember |  |
2015 |  |  | 12,000,000 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_LeasesAcquiredInPlaceMember |  |
2018 |  |  | (1,000,000)us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_LeasesAcquiredInPlaceMember |  |
2019 |  |  | (2,000,000)us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_LeasesAcquiredInPlaceMember |  |
2020 |  |  | (1,000,000)us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_LeasesAcquiredInPlaceMember |  |
Other identified intangible assets [Member] |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Amortization of Intangible Assets | 4,500,000 us-gaap_AmortizationOfIntangibleAssets / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherIntangibleAssetsMember | 6,900,000 us-gaap_AmortizationOfIntangibleAssets / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherIntangibleAssetsMember |  | 1,300,000 us-gaap_AmortizationOfIntangibleAssets / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherIntangibleAssetsMember | 1,500,000 us-gaap_AmortizationOfIntangibleAssets / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherIntangibleAssetsMember
Estimated annual amortization [Abstract] |  |  |  |  |
2016 |  |  | 4,505,000 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherIntangibleAssetsMember |  |
2015 |  |  | 4,036,000 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherIntangibleAssetsMember |  |
2018 |  |  | 3,605,000 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherIntangibleAssetsMember |  |
2019 |  |  | 3,481,000 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherIntangibleAssetsMember |  |
2020 |  |  | $ 3,395,000 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherIntangibleAssetsMember |  |

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