Estimated cost of project.

No definition available.

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- Definition

Number of apartment units.

+ References

No definition available.

+ Details

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- Definition

Number of real estate properties classified as held for sale.

+ References

No definition available.

+ Details

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- Definition

The quarter in which a construction project is estimated to be completed.

+ References

No definition available.

+ Details

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- Definition

The year in which a construction project is estimated to be completed.

+ References

No definition available.

+ Details

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- Definition

Sale amount of pending disposition.

+ References

No definition available.

+ Details

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Balance Type:	credit
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- Definition

The capitalized costs incurred (excluded from amortization), as of the date of the balance sheet, to obtain access to proved reserves and to provide facilities for extracting, treating, gathering and storing the oil and gas.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 932
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-10.(c)(7)(ii))
-URI http://asc.fasb.org/extlink&oid=50486907&loc=d3e511914-122862

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The amount of interest capitalized to an operative builder's inventory during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6450988&loc=d3e26243-108391

+ Details

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Period Type:	duration

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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- Details

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- Details

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- Details

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- Details

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- Details

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- Details

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- Details

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Balance Type:
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- Details

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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