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BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES, INVOL CONV OF ASSETS, FINANCING LIAB, VIE (Details) (USD $) | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |  | 6 Months Ended |  | 3 Months Ended |  |  |  |  | 3 Months Ended | 6 Months Ended |  | 6 Months Ended |  |  | 6 Months Ended |  | 6 Months Ended |  | 6 Months Ended |  | 6 Months Ended |
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Jul. 31, 2013 | Oct. 31, 2014 | Oct. 31, 2013 | Apr. 30, 2014 Building Unit | Jul. 30, 2013 | Apr. 30, 2013 | Oct. 31, 2014 IRET - Minot Apartments, LLC [Member] | Oct. 31, 2014 IRET - Minot Apartments, LLC [Member] Third Party Debt [Member] | Oct. 31, 2014 IRET - Minot Apartments, LLC [Member] Debt from IRET [Member] | Oct. 31, 2014 IRET - Minot Apartments, LLC [Member] Real Estate Development Company [Member] | Oct. 31, 2014 Financing Liability [Member] | Oct. 31, 2013 Chateau Apartment Fire, 2012 [Member] | Jul. 31, 2013 Chateau Apartment Fire, 2012 [Member] | Oct. 31, 2014 Chateau Apartment, Fire 2013 [Member] | Jul. 31, 2014 Chateau Apartment, Fire 2013 [Member] | Apr. 30, 2014 Chateau Apartment, Fire 2013 [Member] | Jan. 31, 2014 Chateau Apartment, Fire 2013 [Member] Building One [Member] Unit | Jan. 31, 2014 Chateau Apartment, Fire 2013 [Member] Building Two [Member] Unit | Oct. 31, 2013 Total Equity [Member] | Apr. 30, 2013 Total Equity [Member] | Oct. 31, 2014 Noncontrolling Interests [Member] | Oct. 31, 2013 Noncontrolling Interests [Member] | Apr. 30, 2014 Noncontrolling Interests [Member] | Apr. 30, 2013 Noncontrolling Interests [Member] | Oct. 31, 2013 Scenario, Previously Reported [Member] Total Equity [Member] | Apr. 30, 2013 Scenario, Previously Reported [Member] Total Equity [Member] | Oct. 31, 2013 Scenario, Previously Reported [Member] Noncontrolling Interests [Member] | Apr. 30, 2013 Scenario, Previously Reported [Member] Noncontrolling Interests [Member] | Oct. 31, 2013 Restatement Adjustment [Member] Total Equity [Member] | Apr. 30, 2013 Restatement Adjustment [Member] Total Equity [Member] | Oct. 31, 2013 Restatement Adjustment [Member] Noncontrolling Interests [Member] | Apr. 30, 2013 Restatement Adjustment [Member] Noncontrolling Interests [Member]
Consolidated Balance Sheet [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redeemable noncontrolling interests consolidated real estate entities |  | $ 6,373,000 |  | $ 6,203,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling interests consolidated real estate entities |  | 26,602,000 |  | 22,638,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total equity |  | 726,668,000 | 769,891,000 | 720,546,000 |  | 755,444,000 |  |  |  |  |  |  |  |  |  |  |  |  | 769,891,000 | 755,444,000 | 89,809,000 | 143,817,000 | 128,362,000 | 142,657,000 | 775,935,000 | 761,381,000 | 149,861,000 | 148,594,000 | (6,044,000) |  | (6,044,000) | (5,937,000)
Consolidated Statement of Equity [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income attributable to Investors Real Estate Trust and nonredeemable noncontrolling interests |  | 5,501,000 | 13,406,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 13,406,000 |  | 538,000 | 1,541,000 |  |  | 13,513,000 |  | 1,648,000 |  | (107,000) |  | (107,000) |
Contributions from nonredeemable noncontrolling interests - consolidated real estate entities |  | 3,757,000 | 3,316,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,757,000 | 3,316,000 |  |  |  |  |  |  |  |  |  |
Balance |  | 726,668,000 | 769,891,000 | 720,546,000 |  | 755,444,000 |  |  |  |  |  |  |  |  |  |  |  |  | 769,891,000 | 755,444,000 | 89,809,000 | 143,817,000 | 128,362,000 | 142,657,000 | 775,935,000 | 761,381,000 | 149,861,000 | 148,594,000 | (6,044,000) |  | (6,044,000) | (5,937,000)
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of 32 unit buildings |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of units in building |  |  |  | 32 |  |  |  |  |  |  |  |  |  |  |  |  | 15 | 57 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of buildings destroyed |  |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Insurance proceeds received for redevelopment |  |  |  |  |  |  |  |  |  |  |  |  | 966,000 | 4,000,000 | 2,000,000 | 1,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain from involuntary conversion |  |  |  |  |  |  |  |  |  |  |  | 966,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Liabilities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  | 107,731,000 |  | 63,178,000 |  |  |  |  |  |  | 7,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated total costs of joint venture project |  |  |  |  |  |  | $ 52,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of project financed (in hundredths) |  |  |  |  |  |  |  | 69.00% | 7.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of ownership in VIE (in hundredths) |  |  |  |  |  |  | 52.90% |  |  | 47.10% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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