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BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES - Real Estate Properties (Details) | 12 Months Ended
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Apr. 30, 2017 USD ($) property item $ / shares shares | Dec. 31, 2016 | Apr. 30, 2016 USD ($) property $ / shares | Dec. 31, 2015 | Apr. 30, 2015 USD ($) property $ / shares
BASIS OF PRESENTATION [Abstract] |  |  |  |  |
Interest in operating partnership (in hundredths) | 88.60% |  | 88.10% |  |
Percentage of general interest partnership (in hundredths) | 100.00% |  | 100.00% |  |
Redemption basis | 1:1 |  |  |  |
Redemptions by limited partner, maximum | item | 2 |  |  |  |
Number of units to redeem, minimum (in units) | shares | 1,000 |  |  |  |
Period to hold the beneficial interest, minimum | 1 year |  |  |  |
IMPAIRMENT OF LONG-LIVED ASSETS [Abstract] |  |  |  |  |
Impairment of real estate investments | $ 57,028,000 |  | $ 5,983,000 |  | $ 6,105,000
IDENTIFIED INTANGIBLE ASSETS AND LIABILITIES AND GOODWILL [Abstract] |  |  |  |  |
New intangible assets | 0 |  | 2,200,000 |  |
Addition to intangible liabilities | 0 |  | $ 101,000 |  |
Weighted average lives of intangible assets acquired |  |  | 8 months 12 days |  |
Goodwill book value | 1,572,000 |  | $ 1,680,000 |  |
Recognized impairment goodwill | 0 |  | 0 |  |
PROPERTY AND EQUIPMENT [Abstract] |  |  |  |  |
Property and equipment cost | 2,100,000 |  | 2,100,000 |  |
Accumulated depreciation | 1,199,000 |  | 1,058,000 |  |
REAL ESTATE DEPOSITS [Abstract] |  |  |  |  |
Deposits held in escrow | $ 23,700,000 |  | $ 0 |  |
INCOME TAXES [Abstract] |  |  |  |  |
Minimum dividend distribution percentage (in hundredths) | 90.00% |  |  |  |
Dividend distribution percentage (in hundredths) | 90.00% |  | 90.00% |  | 90.00%
Distribution of federal income tax (in hundredths) |  | 12.43% |  | 36.28% |
Distribution of capital gain (in hundredths) |  | 87.57% |  | 11.99% |
Distribution made as return of capital (in hundredths) |  |  |  | 51.73% |
REVISION [Abstract] |  |  |  |  |
Interest income | $ 369,000 |  | $ 81,000 |  | $ 62,000
Income before gain on sale of real estate and other investments, gain on bargain purchase and income from discontinued operations | (56,851,000) |  | 4,041,000 |  | 11,237,000
Income from continuing operations | (38,150,000) |  | 17,105,000 |  | 17,330,000
Income from discontinued operations | $ 68,675,000 |  | $ 59,497,000 |  | $ 11,354,000
Earnings per common share from continuing operations - Investors Real Estate Trust - basic and diluted (in dollars per share) | $ / shares | $ (0.24) |  | $ 0.06 |  | $ 0.02
Earnings per common share from discontinued operations - Investors Real Estate Trust - basic and diluted (in dollars per share) | $ / shares | $ 0.50 |  | $ 0.43 |  | $ 0.09
REAL ESTATE INVESTMENTS [Abstract] |  |  |  |  |
Number of year after date of acquisition related to adjustment of real estate preliminary allocations of purchase price | 1 year |  |  |  |
Scenario, Previously Reported [Member] |  |  |  |  |
REVISION [Abstract] |  |  |  |  |
Interest income |  |  | $ 2,256,000 |  |
Income before gain on sale of real estate and other investments, gain on bargain purchase and income from discontinued operations |  |  | 6,216,000 |  |
Income from continuing operations |  |  | 19,280,000 |  |
Income from discontinued operations |  |  | $ 57,322,000 |  |
Earnings per common share from continuing operations - Investors Real Estate Trust - basic and diluted (in dollars per share) | $ / shares |  |  | $ 0.08 |  |
Earnings per common share from discontinued operations - Investors Real Estate Trust - basic and diluted (in dollars per share) | $ / shares |  |  | $ 0.41 |  |
Restatement Adjustment [Member] |  |  |  |  |
REVISION [Abstract] |  |  |  |  |
Interest income |  |  | $ (2,175,000) |  |
Income before gain on sale of real estate and other investments, gain on bargain purchase and income from discontinued operations |  |  | (2,175,000) |  |
Income from continuing operations |  |  | (2,175,000) |  |
Income from discontinued operations |  |  | $ 2,175,000 |  |
Earnings per common share from continuing operations - Investors Real Estate Trust - basic and diluted (in dollars per share) | $ / shares |  |  | $ (0.02) |  |
Earnings per common share from discontinued operations - Investors Real Estate Trust - basic and diluted (in dollars per share) | $ / shares |  |  | $ 0.02 |  |
Buildings and Improvements [Member] | Minimum [Member] |  |  |  |  |
REAL ESTATE INVESTMENTS [Abstract] |  |  |  |  |
Estimated useful life of assets (in years) | 20 years |  |  |  |
Buildings and Improvements [Member] | Maximum [Member] |  |  |  |  |
REAL ESTATE INVESTMENTS [Abstract] |  |  |  |  |
Estimated useful life of assets (in years) | 40 years |  |  |  |
Furniture, Fixtures and Equipment [Member] | Minimum [Member] |  |  |  |  |
REAL ESTATE INVESTMENTS [Abstract] |  |  |  |  |
Estimated useful life of assets (in years) | 5 years |  |  |  |
Furniture, Fixtures and Equipment [Member] | Maximum [Member] |  |  |  |  |
REAL ESTATE INVESTMENTS [Abstract] |  |  |  |  |
Estimated useful life of assets (in years) | 12 years |  |  |  |
Renovations and Improvements [Member] | Minimum [Member] |  |  |  |  |
REAL ESTATE INVESTMENTS [Abstract] |  |  |  |  |
Estimated useful life of assets (in years) | 5 years |  |  |  |
Renovations and Improvements [Member] | Maximum [Member] |  |  |  |  |
REAL ESTATE INVESTMENTS [Abstract] |  |  |  |  |
Estimated useful life of assets (in years) | 10 years |  |  |  |
Minot, ND - property [Member] |  |  |  |  |
IMPAIRMENT OF LONG-LIVED ASSETS [Abstract] |  |  |  |  |
Impairment of real estate investments | $ 2,900,000 |  |  |  |
Multi-family Residential Properties [Member] |  |  |  |  |
IMPAIRMENT OF LONG-LIVED ASSETS [Abstract] |  |  |  |  |
Number of impaired properties | property | 16 |  |  |  |
Multi-family Residential Properties [Member] | Williston, ND - property [Member] |  |  |  |  |
IMPAIRMENT OF LONG-LIVED ASSETS [Abstract] |  |  |  |  |
Number of impaired properties | property | 3 |  |  |  |
Multi-family Residential Properties [Member] | Williston, ND - property 1 [Member] |  |  |  |  |
IMPAIRMENT OF LONG-LIVED ASSETS [Abstract] |  |  |  |  |
Impairment of real estate investments | $ 40,900,000 |  |  |  |
Interest in joint venture (in hundredths) | 70.00% |  |  |  |
Multi-family Residential Properties [Member] | Williston, ND - property 2 [Member] |  |  |  |  |
IMPAIRMENT OF LONG-LIVED ASSETS [Abstract] |  |  |  |  |
Impairment of real estate investments | $ 5,800,000 |  |  |  |
Multi-family Residential Properties [Member] | Williston, ND - property 3 [Member] |  |  |  |  |
IMPAIRMENT OF LONG-LIVED ASSETS [Abstract] |  |  |  |  |
Impairment of real estate investments | $ 4,700,000 |  |  |  |
Interest in joint venture (in hundredths) | 60.00% |  |  |  |
Multi-Family Residential [Member] |  |  |  |  |
IMPAIRMENT OF LONG-LIVED ASSETS [Abstract] |  |  |  |  |
Number of impaired properties | property |  |  | 8 |  |
Multi-Family Residential [Member] | St Cloud Minnesota Member |  |  |  |  |
IMPAIRMENT OF LONG-LIVED ASSETS [Abstract] |  |  |  |  |
Impairment of real estate investments |  |  | $ 1,900,000 |  |
Number of impaired properties | property |  |  | 8 |  |
Unimproved Land [Member] |  |  |  |  |
IMPAIRMENT OF LONG-LIVED ASSETS [Abstract] |  |  |  |  |
Number of impaired properties | property | 2 |  | 2 |  | 2
Unimproved Land [Member] | Williston, ND - property [Member] |  |  |  |  |
IMPAIRMENT OF LONG-LIVED ASSETS [Abstract] |  |  |  |  |
Impairment of real estate investments | $ 2,800,000 |  |  |  |
Interest in joint venture (in hundredths) | 70.00% |  |  |  |
Number of impaired properties | property | 1 |  |  |  |
Unimproved Land [Member] | Minot, ND - property [Member] |  |  |  |  |
IMPAIRMENT OF LONG-LIVED ASSETS [Abstract] |  |  |  |  |
Number of impaired properties | property | 1 |  |  |  |
Unimproved Land [Member] | River Falls Wisconsin Member |  |  |  |  |
IMPAIRMENT OF LONG-LIVED ASSETS [Abstract] |  |  |  |  |
Impairment of real estate investments |  |  | $ 162,000 |  |
Unimproved Land [Member] | Eagan, Minnesota, Unimproved Land [Member] |  |  |  |  |
IMPAIRMENT OF LONG-LIVED ASSETS [Abstract] |  |  |  |  |
Impairment of real estate investments |  |  |  |  | $ 98,000
Unimproved Land [Member] | Weston, Wisconsin, Unimproved Land [Member] |  |  |  |  |
IMPAIRMENT OF LONG-LIVED ASSETS [Abstract] |  |  |  |  |
Impairment of real estate investments |  |  |  |  | $ 442,000
Commercial Properties [Member] |  |  |  |  |
IMPAIRMENT OF LONG-LIVED ASSETS [Abstract] |  |  |  |  |
Number of impaired properties | property |  |  |  |  | 4
IDENTIFIED INTANGIBLE ASSETS AND LIABILITIES AND GOODWILL [Abstract] |  |  |  |  |
Number of real estate properties disposed | property | 4 |  | 8 |  |
Goodwill derecognized | $ 103,000 |  | $ 196,000 |  |
Commercial Healthcare [Member] |  |  |  |  |
IMPAIRMENT OF LONG-LIVED ASSETS [Abstract] |  |  |  |  |
Number of impaired properties | property |  |  | 1 |  |
Office [Member] |  |  |  |  |
IMPAIRMENT OF LONG-LIVED ASSETS [Abstract] |  |  |  |  |
Number of impaired properties | property |  |  | 1 |  |
Retail [Member] | Kalispell, Montana, Retail Property [Member] |  |  |  |  |
IMPAIRMENT OF LONG-LIVED ASSETS [Abstract] |  |  |  |  |
Impairment of real estate investments |  |  |  |  | $ 2,100,000
Office Property [Member] | Eden Prairie Minnesota Member |  |  |  |  |
IMPAIRMENT OF LONG-LIVED ASSETS [Abstract] |  |  |  |  |
Impairment of real estate investments |  |  | $ 440,000 |  |
Office Property [Member] | Golden Valley, Minnesota [Member] |  |  |  |  |
IMPAIRMENT OF LONG-LIVED ASSETS [Abstract] |  |  |  |  |
Impairment of real estate investments |  |  |  |  | 183,000
Office Property [Member] | Minneapolis, Minnesota, Office Property [Member] |  |  |  |  |
IMPAIRMENT OF LONG-LIVED ASSETS [Abstract] |  |  |  |  |
Impairment of real estate investments |  |  |  |  | 1,800,000
Office Property [Member] | Boise, Idaho, Office Property [Member] |  |  |  |  |
IMPAIRMENT OF LONG-LIVED ASSETS [Abstract] |  |  |  |  |
Impairment of real estate investments |  |  |  |  | 1,400,000
Assets Held for Sale [Member] | Multi-family Residential Properties [Member] |  |  |  |  |
Held for Sale [Abstract] |  |  |  |  |
Number of real estate properties classified as held for sale | property | 13 |  | 1 |  |
Assets Held for Sale [Member] | Multi-family Residential Properties [Member] | Minot, ND - property [Member] |  |  |  |  |
IMPAIRMENT OF LONG-LIVED ASSETS [Abstract] |  |  |  |  |
Number of impaired properties | property | 13 |  |  |  |
Assets Held for Sale [Member] | Unimproved Land [Member] |  |  |  |  |
Held for Sale [Abstract] |  |  |  |  |
Number of real estate properties classified as held for sale | property |  |  | 3 |  |
Assets Held for Sale [Member] | Commercial Healthcare [Member] |  |  |  |  |
Held for Sale [Abstract] |  |  |  |  |
Number of real estate properties classified as held for sale | property | 2 |  | 35 |  |
Assets Held for Sale [Member] | Industrial [Member] |  |  |  |  |
Held for Sale [Abstract] |  |  |  |  |
Number of real estate properties classified as held for sale | property |  |  | 1 |  |
Assets Held for Sale [Member] | Retail [Member] |  |  |  |  |
Held for Sale [Abstract] |  |  |  |  |
Number of real estate properties classified as held for sale | property | 2 |  |  |  |
Assets Held for Sale [Member] | Medical Property [Member] | Sartell, Minnesota, Healthcare Property [Member] |  |  |  |  |
IMPAIRMENT OF LONG-LIVED ASSETS [Abstract] |  |  |  |  |
Impairment of real estate investments |  |  | $ 1,900,000 |  |
Discontinued Operations [Member] |  |  |  |  |
IMPAIRMENT OF LONG-LIVED ASSETS [Abstract] |  |  |  |  |
Impairment of real estate investments |  |  | 440,000 |  | 1,400,000
REVISION [Abstract] |  |  |  |  |
Interest income | $ 2,176,000 |  | 2,176,000 |  | 2,176,000
Income from discontinued operations | $ 68,675,000 |  | 59,497,000 |  | $ 11,354,000
Discontinued Operations [Member] | Unimproved Land [Member] | Grand Chute, Wisconsin, Unimproved Land [Member] |  |  |  |  |
IMPAIRMENT OF LONG-LIVED ASSETS [Abstract] |  |  |  |  |
Impairment of real estate investments |  |  | $ 1,600,000 |  |

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