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EARNINGS PER SHARE (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jan. 31, 2015 | Jan. 31, 2014 | Jan. 31, 2015 | Jan. 31, 2014
EARNINGS PER SHARE [Abstract] |  |  |  |
Redemption basis |  |  | one-for-one |
Period to hold the beneficial interest, minimum |  |  | 1 year |
NUMERATOR [Abstract] |  |  |  |
Income from continuing operations - Investors Real Estate Trust | $ 8,371 us-gaap_IncomeLossFromContinuingOperations | $ 3,117 us-gaap_IncomeLossFromContinuingOperations | $ 13,334 us-gaap_IncomeLossFromContinuingOperations | $ 10,034 us-gaap_IncomeLossFromContinuingOperations
Income from discontinued operations - Investors Real Estate Trust | 0 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity | 386 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity | 0 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity | 5,334 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity
Net income attributable to Investors Real Estate Trust | 8,371 us-gaap_NetIncomeLoss | 3,503 us-gaap_NetIncomeLoss | 13,334 us-gaap_NetIncomeLoss | 15,368 us-gaap_NetIncomeLoss
Dividends to preferred shareholders | (2,879)us-gaap_DividendsPreferredStock | (2,879)us-gaap_DividendsPreferredStock | (8,636)us-gaap_DividendsPreferredStock | (8,636)us-gaap_DividendsPreferredStock
Numerator for basic earnings per share - net income available to common shareholders | 5,492 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 624 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 4,698 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 6,732 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Noncontrolling interests - Operating Partnership | 657 us-gaap_NoncontrollingInterestInNetIncomeLossOperatingPartnershipsNonredeemable | 130 us-gaap_NoncontrollingInterestInNetIncomeLossOperatingPartnershipsNonredeemable | 618 us-gaap_NoncontrollingInterestInNetIncomeLossOperatingPartnershipsNonredeemable | 1,406 us-gaap_NoncontrollingInterestInNetIncomeLossOperatingPartnershipsNonredeemable
Numerator for diluted earnings per share | $ 6,149 us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted | $ 754 us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted | $ 5,316 us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted | $ 8,138 us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted
DENOMINATOR [Abstract] |  |  |  |
Denominator for basic earnings per share weighted average shares (in shares) | 120,855 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 106,208 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 116,303 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 104,472 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Effect of convertible operating partnership units (in shares) | 14,461 us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment | 21,819 us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment | 17,334 us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment | 21,830 us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment
Denominator for diluted earnings per share (in shares) | 135,316 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 128,027 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 133,637 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 126,302 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Earnings (loss) per common share from continuing operations - Investors Real Estate Trust - basic and diluted | $ 0.05 us-gaap_IncomeLossFromContinuingOperationsPerBasicAndDilutedShare | $ 0 us-gaap_IncomeLossFromContinuingOperationsPerBasicAndDilutedShare | $ 0.04 us-gaap_IncomeLossFromContinuingOperationsPerBasicAndDilutedShare | $ 0.01 us-gaap_IncomeLossFromContinuingOperationsPerBasicAndDilutedShare
Earnings per common share from discontinued operations - Investors Real Estate Trust - basic and diluted (in dollars per share) | $ 0 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicAndDilutedShare | $ 0 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicAndDilutedShare | $ 0 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicAndDilutedShare | $ 0.05 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicAndDilutedShare
NET INCOME (LOSS) PER COMMON SHARE - BASIC & DILUTED | $ 0.05 us-gaap_EarningsPerShareBasicAndDiluted | $ 0 us-gaap_EarningsPerShareBasicAndDiluted | $ 0.04 us-gaap_EarningsPerShareBasicAndDiluted | $ 0.06 us-gaap_EarningsPerShareBasicAndDiluted

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