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BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES - Real Estate Properties (Details) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jan. 31, 2018 USD ($) property | Jan. 31, 2018 USD ($) | Jan. 31, 2017 USD ($) property | Apr. 30, 2017 USD ($) property
Real Estate Properties [Line Items] |  |  |  |
Restricted cash | $ 121,337 | $ 121,337 |  | $ 27,981
IMPAIRMENT OF LONG-LIVED ASSETS [Abstract] |  |  |  |
Impairment of real estate investments |  | 256 | $ 54,153 |
Unimproved Land [Member] | Williston, ND - property [Member] |  |  |  |
IMPAIRMENT OF LONG-LIVED ASSETS [Abstract] |  |  |  |
Impairment of real estate investments |  |  | $ 2,800 |
Number of impaired properties | property |  |  | 1 |
Interest in joint venture |  |  | 70.00% |
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 |
Interest in joint venture |  |  | 71.50% |
Multi-Family Residential [Member] | Williston, ND - property 2 [Member] |  |  |  |
IMPAIRMENT OF LONG-LIVED ASSETS [Abstract] |  |  |  |
Impairment of real estate investments |  |  | $ 5,800 |
Multi-Family Residential [Member] | Williston, ND - property 3 [Member] |  |  |  |
IMPAIRMENT OF LONG-LIVED ASSETS [Abstract] |  |  |  |
Impairment of real estate investments |  |  | $ 4,700 |
Interest in joint venture |  |  | 60.00% |
Discontinued Operations, Held-for-sale [Member] |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Number of real estate properties classified as held for sale in discontinued operations | property | 27 |  |  | 0
Assets Held for Sale [Member] | Unimproved Land [Member] |  |  |  |
IMPAIRMENT OF LONG-LIVED ASSETS [Abstract] |  |  |  |
Impairment of real estate investments |  | 256 |  |
Tax-Deferred Exchange Proceeds [Member] |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Restricted cash | $ 116,800 | 116,800 |  |
Escrow [Member] |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Restricted cash | $ 4,500 | $ 4,500 |  |

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