ACQUISITIONS AND DISPOSITIONS - Acquisitions (Details) - Acquisitions [Member]	6 Months Ended
Oct. 31, 2018 USD ($) unit	Oct. 31, 2017 USD ($) ft²
Acquisitions and development projects placed in service [Abstract]
Acquisition costs	$ 0	$ 153,750,000
Investment allocation, land		16,418,000
Investment allocation, building		135,621,000
Investment allocation, intangible assets		1,711,000
Multi-Family Residential [Member] \| 191 unit - Oxbo - St. Paul, MN [Member]
Acquisitions and development projects placed in service [Abstract]
Acquisition costs		61,500,000
Number of apartment units \| unit	191
Investment allocation, land		5,809,000
Investment allocation, building		54,910,000
Investment allocation, intangible assets		$ 781,000
Area of real estate property \| ft²		11,477
Multi-Family Residential [Member] \| 500 unit - Park Place - Plymouth, MN [Member]
Acquisitions and development projects placed in service [Abstract]
Acquisition costs		$ 92,250,000
Number of apartment units \| unit	500,000
Investment allocation, land		10,609,000
Investment allocation, building		80,711,000
Investment allocation, intangible assets		$ 930,000

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Area of a real estate property.

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Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 30
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Amount of facility held for productive use including, but not limited to, office, production, storage and distribution facilities, acquired at the acquisition date.

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-Section 50
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Amount of intangible assets, excluding goodwill, acquired at the acquisition date.

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Amount of real estate acquired, at the acquisition date.

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- Definition

The number of units in a real estate property owned as of the balance sheet date.

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