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BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES - Reclassifications, Proceeds from Financing Liability and Variable Interest Entity (Details) $ / shares in Units, $ in Thousands |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Oct. 31, 2017 segment | Apr. 30, 2017 USD ($) | Aug. 31, 2017 USD ($) property | Jan. 31, 2018 USD ($) property $ / shares | Jul. 31, 2017 USD ($) $ / shares | Jan. 31, 2017 USD ($) $ / shares | Jan. 31, 2018 USD ($) $ / shares | Jan. 31, 2017 USD ($) $ / shares | Apr. 30, 2016 segment
CHANGE IN DEPRECIABLE LIVES OF REAL ESTATE ASSETS [Abstract] |  |  |  |  |  |  |  |  |
Number of reportable segments | segment | 2 |  |  |  |  |  |  |  | 5
Net income (loss) available to common shareholders |  |  |  | $ 134,331 |  | $ 19,172 | $ 127,141 | $ 3,372 |
Net income (loss) per common share - basic & diluted (in dollars per share) | $ / shares |  |  |  | $ 1.12 |  | $ 0.16 | $ 1.06 | $ 0.03 |
Proceeds From Financing Liability [Abstract] |  |  |  |  |  |  |  |  |
Number of real estate properties sold | property |  |  |  | 28 |  |  |  |  |
Mortgage loans receivable |  | $ 0 |  | $ 10,329 |  |  | $ 10,329 |  |
Interest income |  |  |  | 408 |  | $ 272 | 628 | $ 354 |
NOTES RECEIVABLE |  |  |  |  |  |  |  |  |
Loan commitment |  |  |  | 6,000 | $ 16,200 |  | 6,000 |  |
Discontinued Operations, Disposed of by Sale [Member] |  |  |  |  |  |  |  |  |
Proceeds From Financing Liability [Abstract] |  |  |  |  |  |  |  |  |
Interest income |  |  |  | 0 |  | $ 544 | 661 | $ 1,634 |
Service Life [Member] |  |  |  |  |  |  |  |  |
CHANGE IN DEPRECIABLE LIVES OF REAL ESTATE ASSETS [Abstract] |  |  |  |  |  |  |  |  |
Depreciation expense |  |  |  |  |  |  | 24,800 |  |
Net income (loss) available to common shareholders |  |  |  |  |  |  | $ (24,800) |  |
Net income (loss) per common share - basic & diluted (in dollars per share) | $ / shares |  |  |  |  |  |  | $ (0.18) |  |
Service Life [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |
CHANGE IN DEPRECIABLE LIVES OF REAL ESTATE ASSETS [Abstract] |  |  |  |  |  |  |  |  |
Estimated useful lives |  | 20 years |  |  |  |  | 10 years |  |
Service Life [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |
CHANGE IN DEPRECIABLE LIVES OF REAL ESTATE ASSETS [Abstract] |  |  |  |  |  |  |  |  |
Estimated useful lives |  | 40 years |  |  |  |  | 30 years |  |
Property with Previous Nine Year Life [Member] | Service Life [Member] |  |  |  |  |  |  |  |  |
CHANGE IN DEPRECIABLE LIVES OF REAL ESTATE ASSETS [Abstract] |  |  |  |  |  |  |  |  |
Estimated useful lives |  | 9 years |  |  |  |  |  |  |
Property with Previous Nine Year Life [Member] | Service Life [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |
CHANGE IN DEPRECIABLE LIVES OF REAL ESTATE ASSETS [Abstract] |  |  |  |  |  |  |  |  |
Estimated useful lives |  |  |  |  |  |  | 5 years |  |
Property with Previous Nine Year Life [Member] | Service Life [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |
CHANGE IN DEPRECIABLE LIVES OF REAL ESTATE ASSETS [Abstract] |  |  |  |  |  |  |  |  |
Estimated useful lives |  |  |  |  |  |  | 10 years |  |
Fully Depreciated Property [Member] | Service Life [Member] |  |  |  |  |  |  |  |  |
CHANGE IN DEPRECIABLE LIVES OF REAL ESTATE ASSETS [Abstract] |  |  |  |  |  |  |  |  |
Depreciation expense |  |  |  |  | $ 9,000 |  |  |  |
Net income (loss) per common share - basic & diluted (in dollars per share) | $ / shares |  |  |  |  | $ 0.07 |  |  |  |
Multi-Family Residential [Member] |  |  |  |  |  |  |  |  |
Proceeds From Financing Liability [Abstract] |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  | 6.00% |  |
NOTES RECEIVABLE |  |  |  |  |  |  |  |  |
Loan commitment |  |  |  |  | $ 16,200 |  |  |  |
Notes receivable |  |  |  | 10,200 |  |  | $ 10,200 |  |
Multi-Family Residential [Member] | Discontinued Operations, Disposed of by Sale [Member] |  |  |  |  |  |  |  |  |
Proceeds From Financing Liability [Abstract] |  |  |  |  |  |  |  |  |
Number of real estate properties sold | property |  |  | 13 |  |  |  |  |  |
Mortgage loans receivable |  |  | $ 11,000 |  |  |  |  |  |
Deferred gain on sale of properties |  |  | $ 626 |  |  |  |  |  |
Interest rate |  |  | 5.50% |  |  |  |  |  |
Interest income |  |  |  | $ 154 |  |  | $ 273 |  |

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