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ORGANIZATION (Details) | Jul. 31, 2012 sqft
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ORGANIZATION [Abstract] |
Percentage of ordinary taxable income that must be distributed to shareholders (in hundredths) | 90.00%
Real Estate Properties [Line Items] |
Net rentable area (in square feet) | 12,300,000
Multi-family residential properties [Member] |
Real Estate Properties [Line Items] |
Number of real estate properties | 87
Number of apartment units | 10,143
Commercial properties [Member] |
Real Estate Properties [Line Items] |
Number of real estate properties | 182

X
- Definition Number of apartment units. + References No definition available. + Details
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Namespace Prefix: | iret_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Net rentable area for properties owned. + References No definition available. + Details
Name: | us-gaap_NetRentableArea
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
- Details
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Namespace Prefix: | us-gaap_
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X
- Details
Name: | us-gaap_RealEstatePropertiesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration