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CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $) | Jan. 31, 2015 | Apr. 30, 2014
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Other assets |  |
Receivable arising from straight-lining of rents, allowance | $ 714,000 us-gaap_LoansAndLeasesReceivableOtherAllowance | $ 796,000 us-gaap_LoansAndLeasesReceivableOtherAllowance
Accounts receivable, allowance | 445,000 us-gaap_AllowanceForDoubtfulAccountsReceivable | 248,000 us-gaap_AllowanceForDoubtfulAccountsReceivable
Intangible assets, accumulated amortization | 25,423,000 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization | 24,071,000 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
Property and equipment, accumulated depreciation | 1,364,000 us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment | 2,041,000 us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Deferred charges and leasing costs, accumulated amortization | 21,020,000 us-gaap_DeferredCostsLeasingAccumulatedAmortization | 21,068,000 us-gaap_DeferredCostsLeasingAccumulatedAmortization
Statement [Line Items] |  |
Common Shares of Beneficial Interest, no par value (in dollars per share) | $ 0 us-gaap_CommonStockNoParValue | $ 0 us-gaap_CommonStockNoParValue
Common Shares of Beneficial Interest, shares issued (in shares) | 122,134,143 us-gaap_CommonStockSharesIssued | 109,019,341 us-gaap_CommonStockSharesIssued
Common Shares of Beneficial Interest, shares outstanding (in shares) | 122,134,143 us-gaap_CommonStockSharesOutstanding | 109,019,341 us-gaap_CommonStockSharesOutstanding
Noncontrolling interests - Operating Partnership (in shares) | 14,397,983 iret_NoncontrollingInterestsOperatingPartnershipUnits | 21,093,445 iret_NoncontrollingInterestsOperatingPartnershipUnits
Preferred Series A [Member] |  |
Statement [Line Items] |  |
Preferred Shares of Beneficial Interest, no par value (in dollars per share) | $ 0 us-gaap_PreferredStockParOrStatedValuePerShare / us-gaap_StatementClassOfStockAxis = us-gaap_PreferredClassAMember | $ 0 us-gaap_PreferredStockParOrStatedValuePerShare / us-gaap_StatementClassOfStockAxis = us-gaap_PreferredClassAMember
Preferred Shares of Beneficial Interest, shares issued (in shares) | 1,150,000 us-gaap_PreferredStockSharesIssued / us-gaap_StatementClassOfStockAxis = us-gaap_PreferredClassAMember | 1,150,000 us-gaap_PreferredStockSharesIssued / us-gaap_StatementClassOfStockAxis = us-gaap_PreferredClassAMember
Preferred Shares of Beneficial Interest, shares outstanding (in shares) | 1,150,000 us-gaap_PreferredStockSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_PreferredClassAMember | 1,150,000 us-gaap_PreferredStockSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_PreferredClassAMember
Preferred Shares of Beneficial Interest, aggregate liquidation preference | 28,750,000 us-gaap_AuctionMarketPreferredSecuritiesStockSeriesAggregateRedemptionAmount / us-gaap_StatementClassOfStockAxis = us-gaap_PreferredClassAMember | 28,750,000 us-gaap_AuctionMarketPreferredSecuritiesStockSeriesAggregateRedemptionAmount / us-gaap_StatementClassOfStockAxis = us-gaap_PreferredClassAMember
Preferred Series B [Member] |  |
Statement [Line Items] |  |
Preferred Shares of Beneficial Interest, no par value (in dollars per share) | $ 0 us-gaap_PreferredStockParOrStatedValuePerShare / us-gaap_StatementClassOfStockAxis = us-gaap_PreferredClassBMember | $ 0 us-gaap_PreferredStockParOrStatedValuePerShare / us-gaap_StatementClassOfStockAxis = us-gaap_PreferredClassBMember
Preferred Shares of Beneficial Interest, shares issued (in shares) | 4,600,000 us-gaap_PreferredStockSharesIssued / us-gaap_StatementClassOfStockAxis = us-gaap_PreferredClassBMember | 4,600,000 us-gaap_PreferredStockSharesIssued / us-gaap_StatementClassOfStockAxis = us-gaap_PreferredClassBMember
Preferred Shares of Beneficial Interest, shares outstanding (in shares) | 4,600,000 us-gaap_PreferredStockSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_PreferredClassBMember | 4,600,000 us-gaap_PreferredStockSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_PreferredClassBMember
Preferred Shares of Beneficial Interest, aggregate liquidation preference | $ 115,000,000 us-gaap_AuctionMarketPreferredSecuritiesStockSeriesAggregateRedemptionAmount / us-gaap_StatementClassOfStockAxis = us-gaap_PreferredClassBMember | $ 115,000,000 us-gaap_AuctionMarketPreferredSecuritiesStockSeriesAggregateRedemptionAmount / us-gaap_StatementClassOfStockAxis = us-gaap_PreferredClassBMember

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