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RETIREMENT PLANS (Details) - USD ($) | 12 Months Ended
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Apr. 30, 2017 | Apr. 30, 2016 | Apr. 30, 2015
RETIREMENT PLANS [Abstract] |  |  |
Maximum contribution each employee, towards 401(k) plan (in hundredths) | 4.00% |  |
Employer contribution towards profit sharing plan and 401(k) plan | $ 565,000 | $ 836,000 | $ 1,000,000
Discretionary employer contribution (as a percent) |  | 3.50% |

X
- Definition Percentage of discretionary contributions made by an employer to a defined contribution plan. + References No definition available. + Details
Name: | iret_DefinedContributionPlanEmployerDiscretionaryContributionPercent
Namespace Prefix: | iret_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_CompensationAndRetirementDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The amount of the cost recognized during the period for defined contribution plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942 + Details
Name: | us-gaap_DefinedContributionPlanCostRecognized
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration