Represents the performance period of the awards of annual total shareholders return (TSR).

No definition available.

Name:	iret_AwardsPerformancePeriodOfAnnualAbsoluteTotalShareholderReturn
Namespace Prefix:	iret_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Refers to the percentage of performance shares considered for the award.

+ References

No definition available.

+ Details

Name:	iret_PercentageOfPerformanceShares
Namespace Prefix:	iret_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Calculated grant date fair value as a percentage of base salary for the officers for the Long Term Incentive Plan awards with a one-year performance period.

+ References

No definition available.

+ Details

Name:	iret_ShareBasedCompensationArrangementByShareBasedPaymentAwardCalculatedGrantDateFairValueAsAPercentageOfBaseSalaryForOfficersForLongTermIncentivePlanAwardsWithOneYearPerformancePeriod
Namespace Prefix:	iret_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Calculated grant date fair value as a percentage of base salary for the officers for the Long Term Incentive Plan awards with a three-year performance period.

+ References

No definition available.

+ Details

Name:	iret_ShareBasedCompensationArrangementByShareBasedPaymentAwardCalculatedGrantDateFairValueAsAPercentageOfBaseSalaryForOfficersForLongTermIncentivePlanAwardsWithThreeYearPerformancePeriod
Namespace Prefix:	iret_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Calculated grant date fair value as a percentage of base salary for the officers for the Long Term Incentive Plan awards with a two-year performance period.

+ References

No definition available.

+ Details

Name:	iret_ShareBasedCompensationArrangementByShareBasedPaymentAwardCalculatedGrantDateFairValueAsAPercentageOfBaseSalaryForOfficersForLongTermIncentivePlanAwardsWithTwoYearPerformancePeriod
Namespace Prefix:	iret_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Refers to the number of shares to be awarded under 2016 LTIP awards under year one.

+ References

No definition available.

+ Details

Name:	iret_ShareBasedCompensationArrangementByShareBasedPaymentAwardLongTermIncentivePlanSharesToBeAwardedUnderYearOne
Namespace Prefix:	iret_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Refers to the number of shares to be awarded under 2016 LTIP awards under year three.

+ References

No definition available.

+ Details

Name:	iret_ShareBasedCompensationArrangementByShareBasedPaymentAwardLongTermIncentivePlanSharesToBeAwardedUnderYearThree
Namespace Prefix:	iret_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Refers to the number of shares to be awarded under 2016 LTIP awards under year two.

+ References

No definition available.

+ Details

Name:	iret_ShareBasedCompensationArrangementByShareBasedPaymentAwardLongTermIncentivePlanSharesToBeAwardedUnderYearTwo
Namespace Prefix:	iret_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

The period of performance for unrestricted shares to vest , in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	iret_ShareBasedCompensationArrangementByShareBasedPaymentAwardPerformancePeriod
Namespace Prefix:	iret_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Term of award in which the equity-based award remains in effect, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	iret_ShareBasedCompensationArrangementByShareBasedPaymentAwardTermOfAward
Namespace Prefix:	iret_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

The rate at which certain awards are payable in restricted versus unrestricted shares in certain award plans.

+ References

No definition available.

+ Details

Name:	iret_ShareBasedCompensationAwardsPercentageOfAwardsPayable
Namespace Prefix:	iret_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Refers to the vesting percentage on the last day of the performance period for the awards.

+ References

No definition available.

+ Details

Name:	iret_VestingPercentageOfAwardsOnTheLastDayOfThePerformancePeriod
Namespace Prefix:	iret_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Refers to the vesting percentage of the award on the first anniversary of the end of the performance period.

+ References

No definition available.

+ Details

Name:	iret_VestingPercentageOnTheFirstAnniversaryOfTheEndOfThePerformancePeriod
Namespace Prefix:	iret_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the weighting of performance metric utilized for the market condition.

+ References

No definition available.

+ Details

Name:	iret_WeightingOfPerformanceMetricUtilizedInMarketCondition
Namespace Prefix:	iret_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB TOPIC 14.F)
-URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(1)(i)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 14
-Section F

+ Details

Name:	us-gaap_AllocatedShareBasedCompensationExpense
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Unrecognized cost of unvested share-based compensation awards.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (i)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

+ Details

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

- Definition

The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(i)-(ii)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(2)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (f)(2)(ii)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The risk-free interest rate assumption that is used in valuing an option on its own shares.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (f)(2)(iv)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
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_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB TOPIC 14.D.2)
-URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (f)(2)(i)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 14
-Section D
-Subsection 2

+ Details

Name:	us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_AwardTypeAxis=us-gaap_RestrictedStockMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_PlanNameAxis=iret_IncentiveAwardPlanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_PlanNameAxis=iret_IncentivePlan2015Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_AwardTypeAxis=us-gaap_CommonStockMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_AwardDateAxis=iret_AwardIn2016Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_AwardTypeAxis=iret_AbsoluteTotalShareholderReturnPerformanceSharesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_AwardTypeAxis=iret_RelativeTotalShareholderReturnPerformanceSharesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

SHARE BASED COMPENSATION (Details) - USD ($)	3 Months Ended		6 Months Ended
SHARE BASED COMPENSATION (Details) - USD ($)	Oct. 31, 2015	Oct. 31, 2014	Oct. 31, 2015	Oct. 31, 2014	Sep. 16, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 539,000	$ 601,000	$ 605,000	$ 1,700,000
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares (in shares)	107,536		107,536
Awards vested during period (in shares)			0	0
Weighted average grant date fair value (in dollars per share)	$ 7.17		$ 7.17
Unrecognized compensation cost related to non-vested share awards	$ 193,000		$ 193,000
2008 Incentive Award Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares (in shares)	2,000,000		2,000,000
Performance period			1 year
Vesting percentage of awards on the last day of the performance period			50.00%
Vesting percentage on the first anniversary of the end of the performance period			50.00%
Awards performance period of annual absolute total shareholder return (TSR)			3 years
2015 Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares (in shares)	4,250,000		4,250,000
Term of award			10 years
Vesting percentage of awards on the last day of the performance period			50.00%
Vesting percentage on the first anniversary of the end of the performance period			50.00%
Awards performance period of annual absolute total shareholder return (TSR)			3 years
2015 Incentive Plan [Member] \| Unrestricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance period			31 months 15 days
Percentage of awards payable	50.00%		50.00%
2015 Incentive Plan [Member] \| Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance period			43 months 15 days
Percentage of awards payable	50.00%		50.00%
2015 Incentive Plan [Member] \| 2016 LTIP Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance period			3 years
Long term incentive plan, shares awarded under year one (in shares)			380,498
Long term incentive plan, shares awarded under year two (in shares)			353,535
Long term incentive plan, shares awarded under year three (in shares)			353,535
Long term incentive plan, expected volatility rate			16.60%
Long term incentive plan, risk free interest rate			1.13%
Long term incentive plan, expected life			3 years
Weighted average grant date fair value (in dollars per share)					$ 7.13
2015 Incentive Plan [Member] \| 2016 LTIP Awards [Member] \| Absolute TSR Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of performance shares			67.00%
Weighting of performance metric utilized for market condition			0.33
2015 Incentive Plan [Member] \| 2016 LTIP Awards [Member] \| Absolute TSR Performance Shares [Member] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Calculated grant date fair value as a percentage of base salary for officers for LTIP awards with three-year performance period			5.00%
Calculated grant date fair value as a percentage of base salary for officers for LTIP awards with one-year performance period			5.00%
Calculated grant date fair value as a percentage of base salary for officers for LTIP awards with two-year performance period			5.00%
2015 Incentive Plan [Member] \| 2016 LTIP Awards [Member] \| Absolute TSR Performance Shares [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Calculated grant date fair value as a percentage of base salary for officers for LTIP awards with three-year performance period			10.00%
Calculated grant date fair value as a percentage of base salary for officers for LTIP awards with one-year performance period			10.00%
Calculated grant date fair value as a percentage of base salary for officers for LTIP awards with two-year performance period			10.00%
2015 Incentive Plan [Member] \| 2016 LTIP Awards [Member] \| Relative TSR Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of performance shares			33.00%
Weighting of performance metric utilized for market condition			0.67
2015 Incentive Plan [Member] \| 2016 LTIP Awards [Member] \| Relative TSR Performance Shares [Member] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Calculated grant date fair value as a percentage of base salary for officers for LTIP awards with three-year performance period			42.00%
Calculated grant date fair value as a percentage of base salary for officers for LTIP awards with one-year performance period			46.00%
Calculated grant date fair value as a percentage of base salary for officers for LTIP awards with two-year performance period			43.00%
2015 Incentive Plan [Member] \| 2016 LTIP Awards [Member] \| Relative TSR Performance Shares [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Calculated grant date fair value as a percentage of base salary for officers for LTIP awards with three-year performance period			85.00%
Calculated grant date fair value as a percentage of base salary for officers for LTIP awards with one-year performance period			96.00%
Calculated grant date fair value as a percentage of base salary for officers for LTIP awards with two-year performance period			86.00%