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BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES - Real Estate Properties (Details) | 6 Months Ended |
--- | --- | ---
Oct. 31, 2017 USD ($) | Oct. 31, 2016 USD ($) property | Apr. 30, 2017 USD ($)
RECENT ACCOUNTING PRONOUNCEMENTS |  |  |
Property owned | $ 1,831,181,000 |  | $ 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 | 1,444,000 | 1,925,000 |
Increase in lender holdbacks for improvements | 513,000 | 614,000 |
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 |
Interest in joint venture (as a percent) |  | 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 |  | $ 40,900,000 |
Interest in joint venture (as a percent) |  | 71.50% |
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 |
Interest in joint venture (as a percent) |  | 60.00% |
Assets Held for Sale [Member] | Unimproved Land [Member] |  |  |
IMPAIRMENT OF LONG-LIVED ASSETS [Abstract] |  |  |
Impairment of real estate investments | $ 256,000 |  |

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- Definition Amount of real estate investment property which may include the following: (1) land available-for-sale; (2) land available-for-development; (3) investments in building and building improvements; (4) tenant allowances; (5) developments in-process; (6) rental properties; and (7) other real estate investments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1(d)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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