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ORGANIZATION (Details)	Oct. 31, 2014
ORGANIZATION [Abstract]
Percentage of ordinary taxable income that must be distributed to shareholders (in hundredths)	90.00%
Multi-family residential properties [Member]
Real Estate Properties [Line Items]
Number of real estate properties	96
Number of apartment units owned	11,292
Commercial properties [Member]
Real Estate Properties [Line Items]
Number of real estate properties	161
Net rentable area (in square feet)	9.9

X

- Definition

The percentage of ordinary taxable income that the entity is required to distribute to shareholders.

+ References

No definition available.

+ Details

Name:	iret_PercentageOfOrdinaryTaxableIncomeThatMustBeDistributedToShareholders
Namespace Prefix:	iret_
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X

- Definition

Net rentable area for properties owned.

+ References

No definition available.

+ Details

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

X

- Definition

The number of real estate properties owned as of the balance sheet date.

+ References

No definition available.

+ Details

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

X

- Definition

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

+ References

No definition available.

+ Details

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

X

- Details

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X

- Details

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