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COMMITMENTS AND CONTINGENCIES, Development, Expansion and Renovation Projects (Details) | 3 Months Ended
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Jul. 31, 2016 USD ($) ft² item property | Jul. 31, 2015 USD ($)
Real Estate Properties [Line Items] |  |
Anticipated Total Cost | $ 105,074,000 |
Project costs incurred to date | 99,633,000 |
Construction interest capitalized | 153,000 | $ 2,300,000
Other [Member] |  |
Real Estate Properties [Line Items] |  |
Project costs incurred to date | $ 3,155,000 |
Multi-Family Residential [Member] | 71 France Phase I, II, III - Edina, MN [Member] |  |
Real Estate Properties [Line Items] |  |
Number of apartment units | item | 241 |
Anticipated Total Cost | $ 73,290,000 |
Project costs incurred to date | $ 72,230,000 |
Interest in joint venture (in hundredths) | 52.60% |
Area of real estate property | ft² | 21,772 |
Multi-Family Residential [Member] | Monticello Crossings - Monticello, MN |  |
Real Estate Properties [Line Items] |  |
Number of apartment units | item | 202 |
Anticipated Total Cost | $ 31,784,000 |
Project costs incurred to date | $ 24,248,000 |
Estimated quarter for completion | 3Q |
Estimated year for completion | 2017 |
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 | 8 |
Sales price of pending disposition | $ 43,500,000 |

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