No definition available.

Name:	iret_AcquisitionsAndDevelopmentProjectsPlacedInServiceAbstract
Namespace Prefix:	iret_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The value of partnership units issued during the period.

+ References

No definition available.

+ Details

Name:	iret_PartnershipUnitsIssued
Namespace Prefix:	iret_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Transaction costs expensed during the period.

+ References

No definition available.

+ Details

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

- Definition

Area of a real estate property.

+ References

No definition available.

+ Details

Name:	us-gaap_AreaOfRealEstateProperty
Namespace Prefix:	us-gaap_
Data Type:	num:areaItemType
Balance Type:	na
Period Type:	instant

- Definition

Date when the business acquisition agreement was executed, in CCYY-MM-DD format.

+ References

No definition available.

+ Details

Name:	us-gaap_BusinessAcquisitionDateOfAcquisitionAgreement1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
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

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

- References

No definition available.

+ Details

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

- Definition

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://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 30
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 30
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477

+ Details

Name:	us-gaap_BusinessCombinationConsiderationTransferred1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of equity interests of the acquirer, including instruments or interests issued or issuable in consideration for the business combination.

+ References

+ Details

Name:	us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

This element represents the amount of earnings or loss of the acquiree since the acquisition date included in the consolidated income statement for the reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(1)
-URI http://asc.fasb.org/extlink&oid=56956515&loc=d3e1392-128463

+ Details

Name:	us-gaap_BusinessCombinationProFormaInformationEarningsOrLossOfAcquireeSinceAcquisitionDateActual
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

This element represents the amount of revenue of the acquiree since the acquisition date included in the consolidated income statement for the reporting period.

+ References

+ Details

Name:	us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of facility held for productive use including, but not limited to, office, production, storage and distribution facilities, acquired at the acquisition date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=56956791&loc=d3e4845-128472

+ Details

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

- Definition

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

+ References

+ Details

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

- Definition

Amount of real estate acquired, at the acquisition date.

+ References

+ Details

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

- Definition

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

+ References

No definition available.

+ Details

Name:	us-gaap_NumberOfUnitsInRealEstateProperty
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Investing Activities
-URI http://asc.fasb.org/extlink&oid=6516133

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3213-108585

+ Details

Name:	us-gaap_PaymentsToAcquireBusinessesGross
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Details

Name:	us-gaap_MajorPropertyClassAxis=iret_AcquisitionsMember
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_GardensGrandForksNDUnitsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

- Details

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

- Details

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

ACQUISITIONS, DEVELOPMENT PROJECTS PLACED IN SERVICE AND DISPOSITIONS, ACQUISITIONS (Details)	3 Months Ended		9 Months Ended
	Jan. 31, 2017 USD ($)	Jan. 31, 2016 USD ($) ft² item	Jan. 31, 2017 USD ($)	Jan. 31, 2016 USD ($) ft² item
Acquisitions and development projects placed in service [Abstract]
Partnership units issued				$ 400,000
Acquisitions Member
Business Acquisition [Line Items]
Transaction costs expensed during the period				162,000
Acquisitions and development projects placed in service [Abstract]
Total acquisition costs	$ 0	$ 0	$ 0	71,750,000
Form of consideration, cash				71,350,000
Form of consideration, units				400,000
Investment allocation, land		6,424,000		6,424,000
Investment allocation, building		64,144,000		64,144,000
Investment allocation, intangible assets		1,182,000		1,182,000
Results of operations from acquired properties [Abstract]
Total revenue				1,969,000
Net loss				(62,000)
Acquisitions Member \| Multi-Family Residential [Member]
Acquisitions and development projects placed in service [Abstract]
Total acquisition costs				65,250,000
Form of consideration, cash				64,850,000
Form of consideration, units				400,000
Investment allocation, land		5,521,000		5,521,000
Investment allocation, building		59,035,000		59,035,000
Investment allocation, intangible assets		694,000		$ 694,000
Acquisitions Member \| Multi-Family Residential [Member] \| 74 unit - Gardens - Grand Forks, ND [Member]
Acquisitions and development projects placed in service [Abstract]
Date acquired				Sep. 10, 2015
Total acquisition costs				$ 9,250,000
Form of consideration, cash				8,850,000
Form of consideration, units				400,000
Investment allocation, land		518,000		518,000
Investment allocation, building		8,672,000		8,672,000
Investment allocation, intangible assets		$ 60,000		$ 60,000
Number of apartment units \| item		74		74
Acquisitions Member \| Multi-Family Residential [Member] \| 276 unit - GrandeVille at Cascade Lake - Rochester, MN [Member]
Acquisitions and development projects placed in service [Abstract]
Date acquired				Oct. 29, 2015
Total acquisition costs				$ 56,000,000
Form of consideration, cash				56,000,000
Investment allocation, land		$ 5,003,000		5,003,000
Investment allocation, building		50,363,000		50,363,000
Investment allocation, intangible assets		$ 634,000		$ 634,000
Number of apartment units \| item		276		276
Acquisitions Member \| Healthcare [Member] \| 27,819 sq ft Lakeside Medical Plaza - Omaha, NE [Member]
Acquisitions and development projects placed in service [Abstract]
Date acquired				Aug. 20, 2015
Total acquisition costs				$ 6,500,000
Form of consideration, cash				6,500,000
Investment allocation, land		$ 903,000		903,000
Investment allocation, building		5,109,000		5,109,000
Investment allocation, intangible assets		$ 488,000		$ 488,000
Area of real estate property \| ft²		27,819		27,819