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BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES, INVOL CONV OF ASSETS, FINANCING LIAB, VIE (Details) (USD $) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jul. 31, 2014 | Jul. 31, 2013 | Apr. 30, 2014 Unit Building | Apr. 30, 2013
Consolidated Balance Sheet [Abstract] |  |  |  |  |
Redeemable noncontrolling interests consolidated real estate entities | $ 6,313,000 |  | $ 5,949,000 | $ 6,203,000 | $ 5,937,000
Noncontrolling interests consolidated real estate entities | 25,910,000 |  |  | 22,638,000 |
Total equity | 726,197,000 |  | 765,357,000 | 720,546,000 | 755,444,000
Consolidated Statement of Equity [Abstract] |  |  |  |  |
Net income attributable to Investors Real Estate Trust and nonredeemable noncontrolling interests | (308,000) |  | 3,204,000 |  |
Contributions from nonredeemable noncontrolling interests - consolidated real estate entities | 3,212,000 | [1] |  |  |
Balance | 726,197,000 |  | 765,357,000 | 720,546,000 | 755,444,000
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |  |  |
Number of 32 unit buildings |  |  |  | 2 |
Number of units in building |  |  |  | 32 |
Number of buildings destroyed |  |  |  | 1 |
Insurance proceeds received for redevelopment | 2,000,000 |  |  |  |
PROCEEDS FROM FINANCING LIABILITY [Abstract] |  |  |  |  |
Proceeds from sale of property |  |  | 7,900,000 |  |
Contract for deed |  |  | 29,000,000 |  |
Sale lease-back recorded in other liabilities |  |  | 7,900,000 |  |
Financing liability balance | 83,666,000 |  | 7,900,000 | 63,178,000 |
IRET - Minot Apartments, LLC [Member] |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Estimated total costs of joint venture project |  |  |  | 52,200,000 |
Percentage of ownership in VIE (in hundredths) | 52.90% |  |  |  |
IRET - Minot Apartments, LLC [Member] | Third Party Debt [Member] |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Percentage of project financed (in hundredths) |  |  |  | 69.00% |
IRET - Minot Apartments, LLC [Member] | Debt from IRET [Member] |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Percentage of project financed (in hundredths) |  |  |  | 7.00% |
IRET - Minot Apartments, LLC [Member] | Real Estate Development Company [Member] |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Percentage of ownership in VIE (in hundredths) | 47.10% |  |  |  |
Chateau Apartment Fire, 2012 [Member] |  |  |  |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |  |  |
Insurance proceeds received for redevelopment |  |  | 966,000 |  |
Gain from involuntary conversion |  |  | 966,000 |  |
Chateau Apartment, Fire 2013 [Member] | Building One [Member] |  |  |  |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |  |  |
Number of units in building | 15 |  |  |  |
Chateau Apartment, Fire 2013 [Member] | Building Two [Member] |  |  |  |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |  |  |
Number of units in building | 57 |  |  |  |
Noncontrolling Interests [Member] |  |  |  |  |
Consolidated Balance Sheet [Abstract] |  |  |  |  |
Total equity | 110,160,000 |  | 142,161,000 | 128,362,000 | 142,657,000
Consolidated Statement of Equity [Abstract] |  |  |  |  |
Net income attributable to Investors Real Estate Trust and nonredeemable noncontrolling interests | (157,000) |  | 126,000 |  |
Contributions from nonredeemable noncontrolling interests - consolidated real estate entities | 3,212,000 |  |  |  |
Balance | 110,160,000 |  | 142,161,000 | 128,362,000 | 142,657,000
Scenario, Previously Reported [Member] |  |  |  |  |
Consolidated Balance Sheet [Abstract] |  |  |  |  |
Total equity |  |  | 771,306,000 |  | 761,381,000
Consolidated Statement of Equity [Abstract] |  |  |  |  |
Net income attributable to Investors Real Estate Trust and nonredeemable noncontrolling interests |  |  | 3,216,000 |  |
Balance |  |  | 771,306,000 |  | 761,381,000
Scenario, Previously Reported [Member] | Noncontrolling Interests [Member] |  |  |  |  |
Consolidated Balance Sheet [Abstract] |  |  |  |  |
Total equity |  |  | 148,110,000 |  | 148,594,000
Consolidated Statement of Equity [Abstract] |  |  |  |  |
Net income attributable to Investors Real Estate Trust and nonredeemable noncontrolling interests |  |  | 138,000 |  |
Balance |  |  | 148,110,000 |  | 148,594,000
Restatement Adjustment [Member] |  |  |  |  |
Consolidated Balance Sheet [Abstract] |  |  |  |  |
Total equity |  |  | (5,949,000) |  | (5,937,000)
Consolidated Statement of Equity [Abstract] |  |  |  |  |
Net income attributable to Investors Real Estate Trust and nonredeemable noncontrolling interests |  |  | (12,000) |  |
Balance |  |  | (5,949,000) |  | (5,937,000)
Restatement Adjustment [Member] | Noncontrolling Interests [Member] |  |  |  |  |
Consolidated Balance Sheet [Abstract] |  |  |  |  |
Total equity |  |  | (5,949,000) |  | (5,937,000)
Consolidated Statement of Equity [Abstract] |  |  |  |  |
Net income attributable to Investors Real Estate Trust and nonredeemable noncontrolling interests |  |  | (12,000) |  |
Balance |  |  | $ (5,949,000) |  | $ (5,937,000)
[1] | Consists of assumed debt (Homestead Garden I - $6.7 million, Homestead Garden II - $3.2 million, Silver Springs - $2.3 million) and value of land contributed by the joint

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