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BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES - Real Estate Properties (Details) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jul. 31, 2017 USD ($) item property shares | Jul. 31, 2016 USD ($) property | Apr. 30, 2017 USD ($) property
BASIS OF PRESENTATION [Abstract] |  |  |
Interest in operating partnership (in hundredths) | 89.20% |  | 88.60%
Redemption basis | one-for-one |  |
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 |  |
INCOME TAXES |  |  |
Percentage of ordinary taxable income that must be distributed to shareholders (in hundredths) | 90.00% |  |
RECENT ACCOUNTING PRONOUNCEMENTS |  |  |
Property owned | $ 1,744,252,000 |  | $ 1,677,481,000
IMPAIRMENT OF LONG-LIVED ASSETS [Abstract] |  |  |
Impairment of real estate investments | 256,000 | $ 54,153,000 |
LENDER HOLDBACKS |  |  |
Decrease in lender holdbacks for improvements | 652,000 | 735,000 |
Increase in lender holdbacks for improvements | 257,000 | 346,000 |
191 unit - Oxbo - St. Paul, MN [Member] | Acquisitions Member |  |  |
RECENT ACCOUNTING PRONOUNCEMENTS |  |  |
Property owned | $ 125,000 |  |
Unimproved Land [Member] | Williston, ND - property [Member] |  |  |
IMPAIRMENT OF LONG-LIVED ASSETS [Abstract] |  |  |
Impairment of real estate investments |  | $ 2,800,000 |
Number of impaired properties | property |  | 1 |
Multi-Family Residential [Member] | Williston, ND - property [Member] |  |  |
IMPAIRMENT OF LONG-LIVED ASSETS [Abstract] |  |  |
Number of impaired properties | property |  | 3 |
Multi-Family Residential [Member] | Williston, ND - property 1 [Member] |  |  |
IMPAIRMENT OF LONG-LIVED ASSETS [Abstract] |  |  |
Impairment of real estate investments |  | $ 40,900,000 |
Multi-Family Residential [Member] | Williston, ND - property 2 [Member] |  |  |
IMPAIRMENT OF LONG-LIVED ASSETS [Abstract] |  |  |
Impairment of real estate investments |  | 5,800,000 |
Multi-Family Residential [Member] | Williston, ND - property 3 [Member] |  |  |
IMPAIRMENT OF LONG-LIVED ASSETS [Abstract] |  |  |
Impairment of real estate investments |  | $ 4,700,000 |
Assets Held for Sale [Member] | Medical Property [Member] |  |  |
Held for Sale [Abstract] |  |  |
Number of real estate properties classified as held for sale | property | 2 |  | 2
Assets Held for Sale [Member] | Unimproved Land [Member] |  |  |
IMPAIRMENT OF LONG-LIVED ASSETS [Abstract] |  |  |
Impairment of real estate investments | $ 256,000 |  |
Held for Sale [Abstract] |  |  |
Number of real estate properties classified as held for sale | property | 1 |  |
Assets Held for Sale [Member] | Multi-Family Residential [Member] |  |  |
Held for Sale [Abstract] |  |  |
Number of real estate properties classified as held for sale | property | 13 |  | 13
Assets Held for Sale [Member] | Commercial Properties [Member] |  |  |
Held for Sale [Abstract] |  |  |
Number of real estate properties classified as held for sale | property | 1 |  | 2

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