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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 | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jul. 31, 2017 USD ($) segment property $ / shares | Jul. 31, 2016 USD ($) $ / shares | Apr. 30, 2017 | Apr. 30, 2015 segment | Apr. 30, 2014 USD ($) property | Jul. 01, 2017 USD ($)
CHANGE IN DEPRECIABLE LIVES OF REAL ESTATE ASSETS [Abstract] |  |  |  |  |  |
Number of reportable segments | segment | 2 |  |  | 5 |  |
Net income (loss) available to common shareholders | $ (13,550) | $ (24,522) |  |  |  |
Net income (loss) per common share - basic & diluted (in dollars per share) | $ / shares | $ (0.11) | $ (0.20) |  |  |  |
NOTES RECEIVABLE |  |  |  |  |  |
Loan commitment | $ 13,200 |  |  |  |  | $ 16,200
Notes receivable | $ 3,000 |  |  |  |  |
Interest rate (in hundredths) | 6.00% |  |  |  |  |
Discontinued Operations, Held-for-sale [Member] |  |  |  |  |  |
CHANGE IN DEPRECIABLE LIVES OF REAL ESTATE ASSETS [Abstract] |  |  |  |  |  |
Number of real estate properties classified as held for sale in discontinued operations | property | 0 |  |  |  |  |
Service Life [Member] |  |  |  |  |  |
CHANGE IN DEPRECIABLE LIVES OF REAL ESTATE ASSETS [Abstract] |  |  |  |  |  |
Depreciation expense | $ 14,400 |  |  |  |  |
Net income (loss) available to common shareholders | $ (14,400) |  |  |  |  |
Net income (loss) per common share - basic & diluted (in dollars per share) | $ / shares | $ (0.11) |  |  |  |  |
Service Life [Member] | Minimum [Member] |  |  |  |  |  |
CHANGE IN DEPRECIABLE LIVES OF REAL ESTATE ASSETS [Abstract] |  |  |  |  |  |
Estimated useful lives | 10 years |  | 20 years |  |  |
Service Life [Member] | Maximum [Member] |  |  |  |  |  |
CHANGE IN DEPRECIABLE LIVES OF REAL ESTATE ASSETS [Abstract] |  |  |  |  |  |
Estimated useful lives | 30 years |  | 40 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 |  |  |  |  |
Senior Housing properties [Member] |  |  |  |  |  |
Proceeds From Financing Liability [Abstract] |  |  |  |  |  |
Number of real estate properties sold | property |  |  |  |  | 2 |
Proceeds from sale of property |  |  |  |  | $ 7,900 |
Contract for deed |  |  |  |  | 29,000 |
Sale lease-back recorded in other liabilities |  |  |  |  | $ 7,900 |
Financing liability balance | $ 7,900 |  |  |  |  |

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