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BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES - Revisions on the Financial Statements (Details) - USD ($) $ in Thousands | Oct. 31, 2018 | Apr. 30, 2018 | Oct. 31, 2017 | Apr. 30, 2017
--- | --- | --- | --- | ---
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |
Common shares of beneficial interest | $ 900,526 | $ 900,097 |  |
Noncontrolling interests - consolidated real estate entities | 6,919 | 8,888 |  |
Redeemable noncontrolling interests - consolidated real estate entities | 6,078 | 6,644 |  |
Equity | 662,737 | 687,563 | $ 585,558 | $ 636,158
Previously Reported [Member] |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |
Common shares of beneficial interest |  | 907,843 |  |
Noncontrolling interests - consolidated real estate entities |  | 1,078 |  |
Redeemable noncontrolling interests - consolidated real estate entities |  | 6,708 |  |
Adjustment [Member] |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |
Common shares of beneficial interest |  | (7,746) |  |
Noncontrolling interests - consolidated real estate entities |  | 7,810 |  |
Redeemable noncontrolling interests - consolidated real estate entities |  | (64) |  |
Common Stock [Member] |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |
Equity | 900,526 | 900,097 | 903,467 | 908,905
Common Stock [Member] | Previously Reported [Member] |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |
Equity |  | 907,843 | 910,683 | 916,121
Common Stock [Member] | Adjustment [Member] |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |
Equity |  | (7,746) | (7,216) | (7,216)
Noncontrolling Interest [Member] |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |
Equity | $ 76,253 | 81,900 | 73,236 | 82,437
Noncontrolling Interest [Member] | Previously Reported [Member] |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |
Equity |  | 74,090 | 65,956 | 75,157
Noncontrolling Interest [Member] | Adjustment [Member] |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |
Equity |  | $ 7,810 | $ 7,280 | $ 7,280

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