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COMMITMENTS AND CONTINGENCIES, Development, Expansion and Renovation Projects (Details) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Oct. 31, 2016 USD ($) item | Oct. 31, 2015 USD ($) | Oct. 31, 2016 USD ($) item property | Oct. 31, 2015 USD ($)
Real Estate Properties [Line Items] |  |  |  |
Anticipated Total Cost | $ 31,784,000 |  | $ 31,784,000 |
Project costs incurred to date | 31,351,000 |  | 31,351,000 |
Construction interest capitalized | 145,000 | $ 1,100,000 | 298,000 | $ 3,400,000
Other [Member] |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Project costs incurred to date | $ 3,283,000 |  | 3,283,000 |
Idaho, Senior Housing and Unimproved Land [Member] |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Sales price of pending disposition |  |  | $ 236,000,000 |
Multi-Family Residential [Member] | Monticello Crossings - Monticello, MN |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Number of apartment units | item | 202 |  | 202 |
Anticipated Total Cost | $ 31,784,000 |  | $ 31,784,000 |
Project costs incurred to date | $ 28,068,000 |  | $ 28,068,000 |
Estimated quarter for completion |  |  | 4Q |
Estimated year for completion |  |  | 2017 |
Multi-Family Residential [Member] | Idaho, Senior Housing and Unimproved Land [Member] |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Number of real estate properties classified as held for sale | property |  |  | 1 |
Senior Housing properties [Member] | Idaho, Senior Housing and Unimproved Land [Member] |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Number of real estate properties classified as held for sale | property |  |  | 26 |
Unimproved Land [Member] | Idaho, Senior Housing and Unimproved Land [Member] |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Number of real estate properties classified as held for sale | property |  |  | 1 |
Commercial Retail [Member] | Grand Forks, ND |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Sales price of pending disposition |  |  | $ 4,000,000 |

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