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ACQUISITIONS AND DISPOSITIONS (Details) (USD $) In Thousands, unless otherwise specified | 6 Months Ended
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Oct. 31, 2013 | Oct. 31, 2012
Acquisitions and development projects placed in service [Abstract] |  |  |  |
Land | $ 6,413 |  | $ 5,985 |
Buildings | 27,473 |  | 51,892 |
Intangible assets | 893 |  | 813 |
Acquisition costs | 34,779 |  | 58,690 |
Results of operations from acquired properties [Abstract] |  |  |  |
Total revenue | 573 |  | 2,929 |
Net income | (233) |  | (135) |
Dispositions [Abstract] |  |  |  |
Sales price | 69,138 |  | 8,223 |
Book value and sales cost | 62,497 |  | 5,543 |
Gain/(Loss) | 6,641 |  | 2,680 |
Multi-Family Residential [Member] |  |  |  |
Acquisitions and development projects placed in service [Abstract] |  |  |  |
Land | 1,492 |  | 4,715 |
Buildings | 17,583 |  | 51,892 |
Intangible assets | 525 |  | 813 |
Acquisition costs | 19,600 |  | 57,420 |
Dispositions [Abstract] |  |  |  |
Sales price |  |  | 6,900 |
Book value and sales cost |  |  | 4,094 |
Gain/(Loss) |  |  | 2,806 |
Commercial Office [Member] |  |  |  |
Dispositions [Abstract] |  |  |  |
Sales price | 12,950 |  |  |
Book value and sales cost | 14,504 |  |  |
Gain/(Loss) | (1,554) |  |  |
Commercial Industrial [Member] |  |  |  |
Dispositions [Abstract] |  |  |  |
Sales price | 53,878 |  |  |
Book value and sales cost | 45,573 |  |  |
Gain/(Loss) | 8,305 |  |  |
Unimproved Land [Member] |  |  |  |
Acquisitions and development projects placed in service [Abstract] |  |  |  |
Land | 3,809 |  | 1,270 |
Buildings | 0 |  | 0 |
Intangible assets | 0 |  | 0 |
Acquisition costs | 3,809 |  | 1,270 |
Other Disposition [Member] |  |  |  |
Dispositions [Abstract] |  |  |  |
Sales price |  |  | 698 |
Book value and sales cost |  |  | 757 |
Gain/(Loss) |  |  | (59) |
Alps Park - Rapid City, SD [Member] | Multi-Family Residential [Member] |  |  |  |
Acquisitions and development projects placed in service [Abstract] |  |  |  |
Date Acquisition | May 01, 2013 |  |  |
Land | 287 |  |  |
Buildings | 5,551 |  |  |
Intangible assets | 362 |  |  |
Acquisition costs | 6,200 |  |  |
Number of apartment units | 71 |  |  |
API Building, Duluth, Minnesota [Member] | Commercial Industrial [Member] |  |  |  |
Dispositions [Abstract] |  |  |  |
Date Disposal | Sep. 24, 2013 |  |  |
Sales price | 2,553 |  |  |
Book value and sales cost | 1,488 |  |  |
Gain/(Loss) | 1,065 |  |  |
Area of a real estate property (in square feet) | 35,000 |  |  |
Bloomington Business Plaza, Bloomington, Minnesota [Member] | Commercial Office [Member] |  |  |  |
Dispositions [Abstract] |  |  |  |
Date Disposal | Sep. 12, 2013 |  |  |
Sales price | 4,500 |  |  |
Book value and sales cost | 7,339 |  |  |
Gain/(Loss) | (2,839) |  |  |
Area of a real estate property (in square feet) | 121,669 |  |  |
Bodycote Industrial Building - Eden Prairie, MN [Member] | Commercial Industrial [Member] |  |  |  |
Dispositions [Abstract] |  |  |  |
Date Disposal | May 13, 2013 |  |  |
Sales price | 3,150 |  |  |
Book value and sales cost | 1,375 |  |  |
Gain/(Loss) | 1,775 |  |  |
Area of a real estate property (in square feet) | 41,880 |  |  |
Brooklyn Park 7401 Boone Avenue, Brooklyn Park, Minnesota [Member] | Commercial Industrial [Member] |  |  |  |
Dispositions [Abstract] |  |  |  |
Date Disposal | Sep. 12, 2013 |  |  |
Sales price | 12,800 |  |  |
Book value and sales cost | 12,181 |  |  |
Gain/(Loss) | 619 |  |  |
Area of a real estate property (in square feet) | 322,751 |  |  |
Chateau II - Minot, ND [Member] | Unimproved Land [Member] |  |  |  |
Acquisitions and development projects placed in service [Abstract] |  |  |  |
Date Acquisition | May 21, 2013 |  |  |
Land | 179 |  |  |
Buildings | 0 |  |  |
Intangible assets | 0 |  |  |
Acquisition costs | 179 |  |  |
Cedar Lake Business Center, St. Louis Park, Minnesota [Member] | Commercial Industrial [Member] |  |  |  |
Dispositions [Abstract] |  |  |  |
Date Disposal | Sep. 12, 2013 |  |  |
Sales price | 2,550 |  |  |
Book value and sales cost | 2,607 |  |  |
Gain/(Loss) | (57) |  |  |
Area of a real estate property (in square feet) | 50,400 |  |  |
Colony Lincoln, NE [Member] | Multi-Family Residential [Member] |  |  |  |
Acquisitions and development projects placed in service [Abstract] |  |  |  |
Date Acquisition |  |  | Jun. 04, 2012 |
Land |  |  | 1,515 |
Buildings |  |  | 15,731 |
Intangible assets |  |  | 254 |
Acquisition costs |  |  | 17,500 |
Number of apartment units |  |  | 232 |
Cypress Court - St. Cloud, MN [Member] | Unimproved Land [Member] |  |  |  |
Acquisitions and development projects placed in service [Abstract] |  |  |  |
Date Acquisition |  |  | Aug. 10, 2012 |
Land |  |  | 447 |
Buildings |  |  | 0 |
Intangible assets |  |  | 0 |
Acquisition costs |  |  | 447 |
Dixon Avenue Industrial Park, Des Moines, Iowa [Member] | Commercial Industrial [Member] |  |  |  |
Dispositions [Abstract] |  |  |  |
Date Disposal | Oct. 31, 2013 |  |  |
Sales price | 14,675 |  |  |
Book value and sales cost | 10,328 |  |  |
Gain/(Loss) | 4,347 |  |  |
Area of a real estate property (in square feet) | 606,006 |  |  |
Eagan Community- Eagan, MN [Member] | Commercial Retail [Member] |  |  |  |
Dispositions [Abstract] |  |  |  |
Date Disposal | May 14, 2013 |  |  |
Sales price | 2,310 |  |  |
Book value and sales cost | 2,420 |  |  |
Gain/(Loss) | (110) |  |  |
Area of a real estate property (in square feet) | 23,187 |  |  |
Fargo 1320 45th St. N - Fargo, ND [Member] | Commercial Industrial [Member] |  |  |  |
Dispositions [Abstract] |  |  |  |
Date Disposal | May 13, 2013 |  |  |
Sales price | 4,700 |  |  |
Book value and sales cost | 4,100 |  |  |
Gain/(Loss) | 600 |  |  |
Area of a real estate property (in square feet) | 42,244 |  |  |
Georgetown Square Condominiums 3 and 4 [Member] | Other Disposition [Member] |  |  |  |
Dispositions [Abstract] |  |  |  |
Date Disposal |  |  | Aug. 02, 2012 |
Sales price |  |  | 368 |
Book value and sales cost |  |  | 421 |
Gain/(Loss) |  |  | (53) |
Georgetown Square Condominiums 5 and 6 [Member] | Other Disposition [Member] |  |  |  |
Dispositions [Abstract] |  |  |  |
Date Disposal |  |  | Jun. 21, 2012 |
Sales price |  |  | 330 |
Book value and sales cost |  |  | 336 |
Gain/(Loss) |  |  | (6) |
Jamestown Unimproved - Jamestown, ND [Member] | Unimproved Land [Member] |  |  |  |
Acquisitions and development projects placed in service [Abstract] |  |  |  |
Date Acquisition | Aug. 09, 2013 |  |  |
Land | 700 |  |  |
Buildings | 0 |  |  |
Intangible assets | 0 |  |  |
Acquisition costs | 700 |  |  |
Kentwood Thomasville Kentwood, MI [Member] | Commercial Retail [Member] |  |  |  |
Dispositions [Abstract] |  |  |  |
Date Disposal |  |  | Jun. 20, 2012 |
Sales price |  |  | 625 |
Book value and sales cost |  |  | 692 |
Gain/(Loss) |  |  | (67) |
Area of a real estate property (in square feet) |  |  | 16,080 |
Lakeside Village Lincoln, NE [Member] | Multi-Family Residential [Member] |  |  |  |
Acquisitions and development projects placed in service [Abstract] |  |  |  |
Date Acquisition |  |  | Jun. 04, 2012 |
Land |  |  | 1,215 |
Buildings |  |  | 15,837 |
Intangible assets |  |  | 198 |
Acquisition costs |  |  | 17,250 |
Number of apartment units |  |  | 208 |
Legends at Heritage Place - Sartell, MN [Member] | Commercial Healthcare [Member] |  |  |  |
Acquisitions and development projects placed in service [Abstract] |  |  |  |
Date Acquisition | Oct. 31, 2013 |  |  |
Land | 1,112 |  |  |
Buildings | 9,890 |  |  |
Intangible assets | 368 |  |  |
Acquisition costs | 11,370 |  |  |
Area Of Real Estate Property Acquisitions (in square feet) | 98,174 |  |  |
Legends at Heritage Place - Sartell, MN [Member] | Unimproved Land [Member] |  |  |  |
Acquisitions and development projects placed in service [Abstract] |  |  |  |
Date Acquisition | Oct. 31, 2013 |  |  |
Land | 1,030 |  |  |
Buildings | 0 |  |  |
Intangible assets | 0 |  |  |
Acquisition costs | 1,030 |  |  |
Lighthouse - Duluth, MN [Member] | Commercial Industrial [Member] |  |  |  |
Dispositions [Abstract] |  |  |  |
Date Disposal | Oct. 08, 2013 |  |  |
Sales price | 1,825 |  |  |
Book value and sales cost | 1,547 |  |  |
Gain/(Loss) | 278 |  |  |
Area of a real estate property (in square feet) | 59,292 |  |  |
Metal Improvement - New Brighton, MN [Member] | Commercial Industrial [Member] |  |  |  |
Dispositions [Abstract] |  |  |  |
Date Disposal | May 13, 2013 |  |  |
Sales price | 2,350 |  |  |
Book value and sales cost | 1,949 |  |  |
Gain/(Loss) | 401 |  |  |
Area of a real estate property (in square feet) | 49,620 |  |  |
Nicollet VII, Burnsville, Minnesota [Member] | Commercial Office [Member] |  |  |  |
Dispositions [Abstract] |  |  |  |
Date Disposal | Sep. 12, 2013 |  |  |
Sales price | 7,290 |  |  |
Book value and sales cost | 6,001 |  |  |
Gain/(Loss) | 1,289 |  |  |
Area of a real estate property (in square feet) | 118,125 |  |  |
Pillsbury Business Center, Bloomington, Minnesota [Member] | Commercial Office [Member] |  |  |  |
Dispositions [Abstract] |  |  |  |
Date Disposal | Sep. 12, 2013 |  |  |
Sales price | 1,160 |  |  |
Book value and sales cost | 1,164 |  |  |
Gain/(Loss) | (4) |  |  |
Area of a real estate property (in square feet) | 42,929 |  |  |
Pinecone Villas - Sartell, MN [Member] | Multi-Family Residential [Member] |  |  |  |
Acquisitions and development projects placed in service [Abstract] |  |  |  |
Date Acquisition | Oct. 31, 2013 |  |  |
Land | 629 |  |  |
Buildings | 2,139 |  |  |
Intangible assets | 32 |  |  |
Acquisition costs | 2,800 |  |  |
Number of apartment units | 24 |  |  |
Ponds at Heritage Place - Sartell, MN [Member] | Multi-Family Residential [Member] |  |  |  |
Acquisitions and development projects placed in service [Abstract] |  |  |  |
Date Acquisition |  |  | Oct. 10, 2012 |
Land |  |  | 395 |
Buildings |  |  | 4,564 |
Intangible assets |  |  | 61 |
Acquisition costs |  |  | 5,020 |
Number of apartment units |  |  | 58 |
Prairiewood Meadows - Fargo, ND [Member] | Multi-Family Residential [Member] |  |  |  |
Dispositions [Abstract] |  |  |  |
Date Disposal |  |  | Sep. 27, 2012 |
Sales price |  |  | 3,450 |
Book value and sales cost |  |  | 2,846 |
Gain/(Loss) |  |  | 604 |
iret_ Number Of Apartment Units Dispositions |  |  | 85 |
RED 20 - Minneapolis, MN [Member] | Unimproved Land [Member] |  |  |  |
Acquisitions and development projects placed in service [Abstract] |  |  |  |
Date Acquisition | Aug. 20, 2013 | [1] |  |
Land | 1,900 | [1] |  |
Buildings | 0 | [1] |  |
Intangible assets | 0 | [1] |  |
Acquisition costs | 1,900 | [1] |  |
Roseville 2929 Long Lake Road - Roseville, MN [Member] | Commercial Industrial [Member] |  |  |  |
Dispositions [Abstract] |  |  |  |
Date Disposal | May 13, 2013 |  |  |
Sales price | 9,275 |  |  |
Book value and sales cost | 9,998 |  |  |
Gain/(Loss) | (723) |  |  |
Area of a real estate property (in square feet) | 172,057 |  |  |
Southpoint - Grand Forks, ND [Member] | Multi-Family Residential [Member] |  |  |  |
Acquisitions and development projects placed in service [Abstract] |  |  |  |
Date Acquisition | Sep. 05, 2013 |  |  |
Land | 576 |  |  |
Buildings | 9,893 |  |  |
Intangible assets | 131 |  |  |
Acquisition costs | 10,600 |  |  |
Number of apartment units | 96 |  |  |
Terrace on the Green - Fargo, ND [Member] | Multi-Family Residential [Member] |  |  |  |
Dispositions [Abstract] |  |  |  |
Date Disposal |  |  | Sep. 27, 2012 |
Sales price |  |  | 3,450 |
Book value and sales cost |  |  | 1,248 |
Gain/(Loss) |  |  | 2,202 |
iret_ Number Of Apartment Units Dispositions |  |  | 116 |
Villa West Topeka, KS [Member] | Multi-Family Residential [Member] |  |  |  |
Acquisitions and development projects placed in service [Abstract] |  |  |  |
Date Acquisition |  |  | May 08, 2012 |
Land |  |  | 1,590 |
Buildings |  |  | 15,760 |
Intangible assets |  |  | 300 |
Acquisition costs |  |  | 17,650 |
Number of apartment units |  |  | 308 |
University Commons - Williston, ND [Member] | Unimproved Land [Member] |  |  |  |
Acquisitions and development projects placed in service [Abstract] |  |  |  |
Date Acquisition |  |  | Aug. 01, 2012 |
Land |  |  | 823 |
Buildings |  |  | 0 |
Intangible assets |  |  | 0 |
Acquisition costs |  |  | 823 |
Development Projects Placed in Service [Member] |  |  |  |
Acquisitions and development projects placed in service [Abstract] |  |  |  |
Land | 0 | [2] | 0 |
Buildings | 8,822 | [2] | 11,477 |
Intangible assets | 0 | [2] | 0 |
Acquisition costs | 8,822 | [2] | 11,477 |
Development Projects Placed in Service [Member] | Quarry Ridge II Rochester, MN [Member] | Multi-Family Residential [Member] |  |  |  |
Acquisitions and development projects placed in service [Abstract] |  |  |  |
Date Acquisition |  |  | Jun. 29, 2012 | [3]
Land |  |  | 0 | [3]
Buildings |  |  | 4,591 | [3]
Intangible assets |  |  | 0 | [3]
Acquisition costs |  |  | 4,591 | [3]
Number of apartment units |  |  | 159 | [3]
Development Projects Placed in Service [Member] | The Landing at Southgate, Minot, ND [Member] | Multi-Family Residential [Member] |  |  |  |
Acquisitions and development projects placed in service [Abstract] |  |  |  |
Date Acquisition | Sep. 04, 2013 | [2],[4] |  |
Land | 0 | [2],[4] |  |
Buildings | 8,822 | [2],[4] |  |
Intangible assets | 0 | [2],[4] |  |
Acquisition costs | 8,822 | [2],[4] |  |
Number of apartment units | 108 | [2],[4] |  |
Development Projects Placed in Service [Member] | Williston Garden Buildings 3 and 4 Williston, ND [Member] | Multi-Family Residential [Member] |  |  |  |
Acquisitions and development projects placed in service [Abstract] |  |  |  |
Date Acquisition |  |  | Jul. 31, 2012 | [5]
Land |  |  | 0 | [5]
Buildings |  |  | 6,886 | [5]
Intangible assets |  |  | 0 | [5]
Acquisition costs |  |  | $ 6,886 | [5]
Number of apartment units |  |  | 73 | [4]
[1] | Land is owned by a joint venture in which the Company has an approximately 59% interest. The joint venture is consolidated in IRET's financial statements.
[2] | Development projects that are placed in service in phases are excluded from this table until the entire project has been placed in service. See Note 6 for additional information on the River Ridge and Cypress Court projects, which were partially placed in service during the three months ended October 31, 2013.
[3] | Development property placed in service June 29, 2012. Additional costs paid in fiscal years 2012 and 2011, and land acquired in fiscal year 2007, totaled $13.0 million, for a total project cost at October 31, 2012 of $17.6 million.
[4] | Development property placed in service September 4, 2013. Additional costs paid in fiscal year 2013 totaled $6.3 million, for a total project cost at October 31, 2013 of $15.1 million. The project is owned by a joint venture entity in which the Company has a 51% interest.
[5] | Development property placed in service July 31, 2012. Buildings 1 and 2 were placed in service in fiscal year 2012. Additional costs paid in fiscal year 2012 totaled $12.0 million, for a total project cost at October 31, 2012 of $18.9 million. The project is owned by a joint venture entity in which the Company has a 60% interest.

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Data Type: | xbrli:monetaryItemType
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Period Type: | instant