Impairment of real estate continuing and discontinued operations.

No definition available.

Name:	iret_ImpairmentOfRealEstateContinuingAndDiscontinuedOperations
Namespace Prefix:	iret_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The number of impaired properties for the fiscal year.

+ References

No definition available.

+ Details

Name:	iret_NumberOfImpairedProperties
Namespace Prefix:	iret_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of real estate properties classified as held for sale in discontinued operations.

+ References

No definition available.

+ Details

Name:	iret_NumberOfRealEstatePropertiesClassifiedAsHeldForSaleInDiscontinuedOperations
Namespace Prefix:	iret_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- References

No definition available.

+ Details

Name:	us-gaap_AssetImpairmentChargesAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=66011266&loc=d3e33918-111571

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- 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

Name:	us-gaap_RealEstatePropertiesLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The carrying amounts of cash and cash equivalent items which are restricted as to withdrawal or usage. Restrictions may include legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or entity statements of intention with regard to particular deposits; however, time deposits and short-term certificates of deposit are not generally included in legally restricted deposits. Excludes compensating balance arrangements that are not agreements which legally restrict the use of cash amounts shown on the balance sheet. This element is for unclassified presentations; for classified presentations there is a separate and distinct element.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.1)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=iret_ImpairedPropertyWillistonNdMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis=iret_MultiFamilyResidentialMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=iret_ImpairedPropertyOneWillistonNdMember
Namespace Prefix:
Data Type:	na
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- Details

Name:	us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=iret_ImpairedPropertyTwoWillistonNdMember
Namespace Prefix:
Data Type:	na
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- Details

Name:	us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=iret_ImpairedPropertyThreeWillistonNdMember
Namespace Prefix:
Data Type:	na
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- Details

Name:	us-gaap_DisposalGroupClassificationAxis=us-gaap_DiscontinuedOperationsHeldforsaleMember
Namespace Prefix:
Data Type:	na
Balance Type:
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- Details

Name:	us-gaap_DisposalGroupClassificationAxis=us-gaap_DisposalGroupHeldforsaleNotDiscontinuedOperationsMember
Namespace Prefix:
Data Type:	na
Balance Type:
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- Details

Name:	us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsAxis=iret_TaxDeferredExchangeProceedsMember
Namespace Prefix:
Data Type:	na
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- Details

Name:	us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsAxis=iret_EscrowDepositsMember
Namespace Prefix:
Data Type:	na
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BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES - Real Estate Properties (Details) $ in Thousands	3 Months Ended	9 Months Ended		12 Months Ended
	Jan. 31, 2018 USD ($) property	Jan. 31, 2018 USD ($)	Jan. 31, 2017 USD ($) property	Apr. 30, 2017 USD ($) property
Real Estate Properties [Line Items]
Restricted cash	$ 121,337	$ 121,337		$ 27,981
IMPAIRMENT OF LONG-LIVED ASSETS [Abstract]
Impairment of real estate investments		256	$ 54,153
Unimproved Land [Member] \| Williston, ND - property [Member]
IMPAIRMENT OF LONG-LIVED ASSETS [Abstract]
Impairment of real estate investments			$ 2,800
Number of impaired properties \| property			1
Interest in joint venture			70.00%
Multi-Family Residential [Member] \| Williston, ND - property [Member]
IMPAIRMENT OF LONG-LIVED ASSETS [Abstract]
Number of impaired properties \| property			3
Multi-Family Residential [Member] \| Williston, ND - property 1 [Member]
IMPAIRMENT OF LONG-LIVED ASSETS [Abstract]
Impairment of real estate investments			$ 40,900
Interest in joint venture			71.50%
Multi-Family Residential [Member] \| Williston, ND - property 2 [Member]
IMPAIRMENT OF LONG-LIVED ASSETS [Abstract]
Impairment of real estate investments			$ 5,800
Multi-Family Residential [Member] \| Williston, ND - property 3 [Member]
IMPAIRMENT OF LONG-LIVED ASSETS [Abstract]
Impairment of real estate investments			$ 4,700
Interest in joint venture			60.00%
Discontinued Operations, Held-for-sale [Member]
Real Estate Properties [Line Items]
Number of real estate properties classified as held for sale in discontinued operations \| property	27			0
Assets Held for Sale [Member] \| Unimproved Land [Member]
IMPAIRMENT OF LONG-LIVED ASSETS [Abstract]
Impairment of real estate investments		256
Tax-Deferred Exchange Proceeds [Member]
Real Estate Properties [Line Items]
Restricted cash	$ 116,800	116,800
Escrow [Member]
Real Estate Properties [Line Items]
Restricted cash	$ 4,500	$ 4,500