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BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES (Details) (USD $) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jan. 31, 2015 | Jan. 31, 2015 Property Redemption | Jan. 31, 2014 | Apr. 30, 2014
BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES [Abstract] |  |  |  |
Interest in operating partnership (in hundredths) | 89.50%iret_InterestInCommonUnitsInOperatingPartnership | 89.50%iret_InterestInCommonUnitsInOperatingPartnership |  | 83.80%iret_InterestInCommonUnitsInOperatingPartnership
Redemption basis |  | one-for-one |  |
Redemptions by limited partner, maximum |  | 2 iret_RedemptionsByLimitedPartnerMaximum |  |
Number of units to redeem, minimum (in units) | 1,000 iret_NumberOfUnitsToRedeemMinimum | 1,000 iret_NumberOfUnitsToRedeemMinimum |  |
Period to hold the beneficial interest, minimum |  | 1 year |  |
Real Estate Properties [Line Items] |  |  |  |
Impairment of retail property |  | $ 6,105,000 us-gaap_ImpairmentOfRealEstate | $ 6,658,000 us-gaap_ImpairmentOfRealEstate |
Impairment of retail property attributable to discontinued operations |  | 0 iret_DiscontinuedOperationImpairmentOfAssetsFromDisposalOfDiscontinuedOperationBeforeIncomeTax | 1,860,000 iret_DiscontinuedOperationImpairmentOfAssetsFromDisposalOfDiscontinuedOperationBeforeIncomeTax |
Number of impaired properties |  | 6 iret_NumberOfImpairedProperties |  |
Held For Sale [Line Items] |  |  |  |
Liabilities related to real estate held for sale | 22,600,000 us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperation | 22,600,000 us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperation |  |
Compensating Balances [Line Items] |  |  |  |
Compensating balances | 14,300,000 us-gaap_CompensatingBalanceAmount | 14,300,000 us-gaap_CompensatingBalanceAmount |  |
Remaining terms of certificates of deposit | 2 years |  |  |
Decrease in lender holdbacks | 11,063,000 iret_DecreaseInLenderHoldbacksForImprovements | 11,063,000 iret_DecreaseInLenderHoldbacksForImprovements | 2,186,000 iret_DecreaseInLenderHoldbacksForImprovements |
Increase in lender holdbacks | 621,000 iret_IncreaseLenderHoldbacksForImprovements | 913,000 iret_IncreaseLenderHoldbacksForImprovements | 12,388,000 iret_IncreaseLenderHoldbacksForImprovements |
Dacotah Bank, Minot, North Dakota [Member] |  |  |  |
Compensating Balances [Line Items] |  |  |  |
Compensating balances | 350,000 us-gaap_CompensatingBalanceAmount / us-gaap_CashAndCashEquivalentsAxis = iret_DacotahBankMinotNorthDakotaMember | 350,000 us-gaap_CompensatingBalanceAmount / us-gaap_CashAndCashEquivalentsAxis = iret_DacotahBankMinotNorthDakotaMember |  |
Commerce Bank [Member] |  |  |  |
Compensating Balances [Line Items] |  |  |  |
Compensating balances | 100,000 us-gaap_CompensatingBalanceAmount / us-gaap_CashAndCashEquivalentsAxis = iret_CommerceBankMember | 100,000 us-gaap_CompensatingBalanceAmount / us-gaap_CashAndCashEquivalentsAxis = iret_CommerceBankMember |  |
United Community Bank, Minot, North Dakota [Member] |  |  |  |
Compensating Balances [Line Items] |  |  |  |
Compensating balances | 275,000 us-gaap_CompensatingBalanceAmount / us-gaap_CashAndCashEquivalentsAxis = iret_UnitedCommunityBankMinotNorthDakotaMember | 275,000 us-gaap_CompensatingBalanceAmount / us-gaap_CashAndCashEquivalentsAxis = iret_UnitedCommunityBankMinotNorthDakotaMember |  |
Bremer Bank [Member] |  |  |  |
Compensating Balances [Line Items] |  |  |  |
Compensating balances | 1,300,000 us-gaap_CompensatingBalanceAmount / us-gaap_CashAndCashEquivalentsAxis = iret_BremerBankMember | 1,300,000 us-gaap_CompensatingBalanceAmount / us-gaap_CashAndCashEquivalentsAxis = iret_BremerBankMember |  |
First International Bank, Watford City, North Dakota [Member] |  |  |  |
Compensating Balances [Line Items] |  |  |  |
Compensating balances | 6,100,000 us-gaap_CompensatingBalanceAmount / us-gaap_CashAndCashEquivalentsAxis = iret_FirstInternationalBankWatfordCityNorthDakotaMember | 6,100,000 us-gaap_CompensatingBalanceAmount / us-gaap_CashAndCashEquivalentsAxis = iret_FirstInternationalBankWatfordCityNorthDakotaMember |  |
Peoples State Bank of Velva, North Dakota [Member] |  |  |  |
Compensating Balances [Line Items] |  |  |  |
Compensating balances | 225,000 us-gaap_CompensatingBalanceAmount / us-gaap_CashAndCashEquivalentsAxis = iret_PeoplesStateBankOfVelvaNorthDakotaMember | 225,000 us-gaap_CompensatingBalanceAmount / us-gaap_CashAndCashEquivalentsAxis = iret_PeoplesStateBankOfVelvaNorthDakotaMember |  |
Associated Bank, Green Bay, Wisconsin [Member] |  |  |  |
Compensating Balances [Line Items] |  |  |  |
Compensating balances | 3,600,000 us-gaap_CompensatingBalanceAmount / us-gaap_CashAndCashEquivalentsAxis = iret_AssociatedBankGreenBayWisconsinMember | 3,600,000 us-gaap_CompensatingBalanceAmount / us-gaap_CashAndCashEquivalentsAxis = iret_AssociatedBankGreenBayWisconsinMember |  |
American National Bank, Omaha, Nebraska [Member] |  |  |  |
Compensating Balances [Line Items] |  |  |  |
Compensating balances | 400,000 us-gaap_CompensatingBalanceAmount / us-gaap_CashAndCashEquivalentsAxis = iret_AmericanNationalBankOmahaNebraskaMember | 400,000 us-gaap_CompensatingBalanceAmount / us-gaap_CashAndCashEquivalentsAxis = iret_AmericanNationalBankOmahaNebraskaMember |  |
Private Bank [Member] |  |  |  |
Compensating Balances [Line Items] |  |  |  |
Compensating balances | 2,000,000 us-gaap_CompensatingBalanceAmount / us-gaap_CashAndCashEquivalentsAxis = iret_PrivateBankMember | 2,000,000 us-gaap_CompensatingBalanceAmount / us-gaap_CashAndCashEquivalentsAxis = iret_PrivateBankMember |  |
United Community and Dacotah Bank [Member] | Other Investments [Member] |  |  |  |
Compensating Balances [Line Items] |  |  |  |
Certificates of deposit | 329,000 us-gaap_CertificatesOfDepositAtCarryingValue / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherInvestmentsMember / us-gaap_CashAndCashEquivalentsAxis = iret_UnitedCommunityBankAndEquityBankMember | 329,000 us-gaap_CertificatesOfDepositAtCarryingValue / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherInvestmentsMember / us-gaap_CashAndCashEquivalentsAxis = iret_UnitedCommunityBankAndEquityBankMember |  |
Anoka, Minnesota [Member] |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Impairment of retail property |  | 265,000 us-gaap_ImpairmentOfRealEstate / us-gaap_RealEstatePropertiesAxis = iret_AnokaMinnesotaMember |  |
Number of impaired properties |  | 1 iret_NumberOfImpairedProperties / us-gaap_RealEstatePropertiesAxis = iret_AnokaMinnesotaMember |  |
Minneapolis, Minnesota, office property [Member] |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Impairment of retail property |  | 1,800,000 us-gaap_ImpairmentOfRealEstate / us-gaap_RealEstatePropertiesAxis = iret_MinneapolisMinnesotaOfficePropertyMember |  |
Number of impaired properties |  | 1 iret_NumberOfImpairedProperties / us-gaap_RealEstatePropertiesAxis = iret_MinneapolisMinnesotaOfficePropertyMember |  |
Kalispell, Montana, retail property [Member] |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Impairment of retail property |  | 2,100,000 us-gaap_ImpairmentOfRealEstate / us-gaap_RealEstatePropertiesAxis = iret_KalispellMontanaRetailMember |  |
Number of impaired properties |  | 1 iret_NumberOfImpairedProperties / us-gaap_RealEstatePropertiesAxis = iret_KalispellMontanaRetailMember |  |
Golden Valley, Minnesota, office property [Member] |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Impairment of retail property |  | 183,000 us-gaap_ImpairmentOfRealEstate / us-gaap_RealEstatePropertiesAxis = iret_GoldenValleyMinnesotaOfficePropertyMember |  |
Number of impaired properties |  | 1 iret_NumberOfImpairedProperties / us-gaap_RealEstatePropertiesAxis = iret_GoldenValleyMinnesotaOfficePropertyMember |  |
Eagan, Minnesota, unimproved land [Member] |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Impairment of retail property |  | 98,000 us-gaap_ImpairmentOfRealEstate / us-gaap_RealEstatePropertiesAxis = iret_EaganMinnesotaUnimprovedLandMember |  |
Number of impaired properties |  | 1 iret_NumberOfImpairedProperties / us-gaap_RealEstatePropertiesAxis = iret_EaganMinnesotaUnimprovedLandMember |  |
Bloomington, Minnesota [Member] |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Impairment of retail property |  | 329,000 us-gaap_ImpairmentOfRealEstate / us-gaap_RealEstatePropertiesAxis = iret_BloomingtonMinnesotaMember |  |
Number of impaired properties |  | 1 iret_NumberOfImpairedProperties / us-gaap_RealEstatePropertiesAxis = iret_BloomingtonMinnesotaMember |  |
Boise, Idaho, office property [Member] |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Impairment of retail property |  | 1,400,000 us-gaap_ImpairmentOfRealEstate / us-gaap_RealEstatePropertiesAxis = iret_BoiseIdahoOfficePropertyMember |  |
Number of impaired properties |  | 1 iret_NumberOfImpairedProperties / us-gaap_RealEstatePropertiesAxis = iret_BoiseIdahoOfficePropertyMember |  |
Clive, Iowa [Member] |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Impairment of retail property |  | 402,000 us-gaap_ImpairmentOfRealEstate / us-gaap_RealEstatePropertiesAxis = iret_CliveIowaMember |  |
Number of impaired properties |  | 1 iret_NumberOfImpairedProperties / us-gaap_RealEstatePropertiesAxis = iret_CliveIowaMember |  |
Roseville, Minnesota, industrial property [Member] |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Impairment of retail property |  | 4,800,000 us-gaap_ImpairmentOfRealEstate / us-gaap_RealEstatePropertiesAxis = iret_RosevilleMinnesotaIndustrialPropertyMember |  |
Number of impaired properties |  | 1 iret_NumberOfImpairedProperties / us-gaap_RealEstatePropertiesAxis = iret_RosevilleMinnesotaIndustrialPropertyMember |  |
St. Louis Park, Minnesota [Member] |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Impairment of retail property |  | 864,000 us-gaap_ImpairmentOfRealEstate / us-gaap_RealEstatePropertiesAxis = iret_StLouisParkMinnesotaMember |  |
Number of impaired properties |  | 1 iret_NumberOfImpairedProperties / us-gaap_RealEstatePropertiesAxis = iret_StLouisParkMinnesotaMember |  |
Weston, Wisconsin, unimproved land [Member] |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Impairment of retail property |  | $ 442,000 us-gaap_ImpairmentOfRealEstate / us-gaap_RealEstatePropertiesAxis = iret_WestonWisconsinUnimprovedLandMember |  |
Number of impaired properties |  | 1 iret_NumberOfImpairedProperties / us-gaap_RealEstatePropertiesAxis = iret_WestonWisconsinUnimprovedLandMember |  |

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