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CONSOLIDATED STATEMENTS OF EQUITY (USD $) In Thousands | PREFERRED SHARES [Member] | COMMON SHARES [Member] | ACCUMULATED DISTRIBUTIONS IN EXCESS OF NET INCOME [Member] | Noncontrolling Interests [Member] | Total | Preferred Series A [Member] ACCUMULATED DISTRIBUTIONS IN EXCESS OF NET INCOME [Member] | Preferred Series A [Member] | Preferred Series B [Member] ACCUMULATED DISTRIBUTIONS IN EXCESS OF NET INCOME [Member] | Preferred Series B [Member]
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Balance at Apr. 30, 2013 | $ 138,674 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember | $ 784,454 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | $ (310,341)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | $ 142,657 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember | $ 755,444 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest |  |  |  |
Balance (in shares) at Apr. 30, 2013 | 5,750 us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember | 101,488 us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |  |  |
Net income attributable to Investors Real Estate Trust and nonredeemable interests |  |  | 15,368 us-gaap_IncomeLossIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 2,038 us-gaap_IncomeLossIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember | 17,406 us-gaap_IncomeLossIncludingPortionAttributableToNoncontrollingInterest |  |  |  |
Distributions - common shares and units |  |  | (40,685)us-gaap_DividendsCommonStock / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  | (49,193)us-gaap_DividendsCommonStock |  |  |  |
Distributions - common shares and units |  |  |  | (8,508)us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember |  |  |  |  |
Distributions - preferred shares |  |  |  |  | (8,636)us-gaap_DividendsPreferredStock | (1,779)us-gaap_DividendsPreferredStock / us-gaap_StatementClassOfStockAxis = us-gaap_PreferredClassAMember / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | (1,779)us-gaap_DividendsPreferredStock / us-gaap_StatementClassOfStockAxis = us-gaap_PreferredClassAMember | (6,857)us-gaap_DividendsPreferredStock / us-gaap_StatementClassOfStockAxis = us-gaap_PreferredClassBMember / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | (6,857)us-gaap_DividendsPreferredStock / us-gaap_StatementClassOfStockAxis = us-gaap_PreferredClassBMember
Distribution reinvestment and share purchase plan |  | 44,153 us-gaap_StockIssuedDuringPeriodValueDividendReinvestmentPlan / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  | 44,153 us-gaap_StockIssuedDuringPeriodValueDividendReinvestmentPlan |  |  |  |
DRIP Discount |  | 5,239 us-gaap_StockIssuedDuringPeriodSharesDividendReinvestmentPlan / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |  |  |
Share-based compensation |  | 112 us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  | 112 us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures |  |  |  |
Share-based compensation (in shares) |  | 13 us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |  |  |
Partnership units issued |  |  |  | 3,480 iret_PartnershipUnitsIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember | 3,480 iret_PartnershipUnitsIssued |  |  |  |
Redemption of units for common shares |  | 1,131 us-gaap_PartnersCapitalAccountRedemptions / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  | (1,131)us-gaap_PartnersCapitalAccountRedemptions / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember | 0 us-gaap_PartnersCapitalAccountRedemptions |  |  |  |
Redemption of units for common shares, shares (in shares) |  | 197 us-gaap_PartnersCapitalAccountUnitsRedeemed / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |  |  |
Contributions from nonredeemable noncontrolling interests - consolidated real estate entities |  |  |  | 3,316 us-gaap_NoncontrollingInterestIncreaseFromSubsidiaryEquityIssuance / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember | 3,316 us-gaap_NoncontrollingInterestIncreaseFromSubsidiaryEquityIssuance |  |  |  |
Other |  | (34)us-gaap_StockholdersEquityOther / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  | (731)us-gaap_StockholdersEquityOther / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember | (765)us-gaap_StockholdersEquityOther |  |  |  |
Other, shares (in shares) |  | 0 iret_OtherShares / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |  |  |
Balance at Jan. 31, 2014 | 138,674 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember | 829,816 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | (344,294)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 141,121 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember | 765,317 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest |  |  |  |
Balance, shares (in shares) at Jan. 31, 2014 | 5,750 us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember | 106,937 us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |  |  |
Balance at Apr. 30, 2014 | 138,674 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember | 843,268 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | (389,758)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 128,362 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember | 720,546 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest |  |  |  |
Balance (in shares) at Apr. 30, 2014 | 5,750 us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember | 109,019 us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |  |  |
Net income attributable to Investors Real Estate Trust and nonredeemable interests |  |  | 13,334 us-gaap_IncomeLossIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 1,351 us-gaap_IncomeLossIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember | 14,685 us-gaap_IncomeLossIncludingPortionAttributableToNoncontrollingInterest |  |  |  |
Distributions - common shares and units |  |  | (45,222)us-gaap_DividendsCommonStock / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  | (51,975)us-gaap_DividendsCommonStock |  |  |  |
Distributions - common shares and units |  |  |  | (6,753)us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember |  |  |  |  |
Distributions - preferred shares |  |  |  |  | (8,636)us-gaap_DividendsPreferredStock | (1,779)us-gaap_DividendsPreferredStock / us-gaap_StatementClassOfStockAxis = us-gaap_PreferredClassAMember / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | (1,779)us-gaap_DividendsPreferredStock / us-gaap_StatementClassOfStockAxis = us-gaap_PreferredClassAMember | (6,857)us-gaap_DividendsPreferredStock / us-gaap_StatementClassOfStockAxis = us-gaap_PreferredClassBMember / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | (6,857)us-gaap_DividendsPreferredStock / us-gaap_StatementClassOfStockAxis = us-gaap_PreferredClassBMember
Distribution reinvestment and share purchase plan |  | 50,875 us-gaap_StockIssuedDuringPeriodValueDividendReinvestmentPlan / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  | 50,875 us-gaap_StockIssuedDuringPeriodValueDividendReinvestmentPlan |  |  |  |
DRIP Discount |  | 6,205 us-gaap_StockIssuedDuringPeriodSharesDividendReinvestmentPlan / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |  |  |
Share-based compensation |  | 2,632 us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  | 2,632 us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures |  |  |  |
Share-based compensation (in shares) |  | 204 us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |  |  |
Partnership units issued |  |  |  | 100 iret_PartnershipUnitsIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember | 100 iret_PartnershipUnitsIssued |  |  |  |
Redemption of units for common shares |  | 38,512 us-gaap_PartnersCapitalAccountRedemptions / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  | (38,512)us-gaap_PartnersCapitalAccountRedemptions / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember | 0 us-gaap_PartnersCapitalAccountRedemptions |  |  |  |
Redemption of units for common shares, shares (in shares) |  | 6,706 us-gaap_PartnersCapitalAccountUnitsRedeemed / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |  |  |
Contributions from nonredeemable noncontrolling interests - consolidated real estate entities |  |  |  | 8,540 us-gaap_NoncontrollingInterestIncreaseFromSubsidiaryEquityIssuance / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember | 8,540 us-gaap_NoncontrollingInterestIncreaseFromSubsidiaryEquityIssuance |  |  |  |
Other |  |  |  | (555)us-gaap_StockholdersEquityOther / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember | (555)us-gaap_StockholdersEquityOther |  |  |  |
Balance at Jan. 31, 2015 | $ 138,674 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember | $ 935,287 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | $ (430,282)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | $ 92,533 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember | $ 736,212 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest |  |  |  |
Balance, shares (in shares) at Jan. 31, 2015 | 5,750 us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember | 122,134 us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |  |  |

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