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COMMITMENTS AND CONTINGENCIES - Development, Expansion and Renovation Projects (Details) - Senior Housing properties [Member] $ in Millions | 3 Months Ended
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Jul. 31, 2017 USD ($) property
Real Estate Properties [Line Items] |
Number of real estate properties classified as held for sale | property | 2
Sales price of pending disposition | $ | $ 36.9

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- Definition Number of real estate properties classified as held for sale. + References No definition available. + Details
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Namespace Prefix: | iret_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Sale amount of pending disposition. + References No definition available. + Details
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Namespace Prefix: | iret_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- 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

X
- Details
Name: | us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis=iret_SeniorHousingPropertiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |