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NONCONTROLLING INTERESTS (Details) (USD $) | 12 Months Ended |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12 Months Ended
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Apr. 30, 2013 | Apr. 30, 2012 | Apr. 30, 2013 Mendota Properties LLC [Member] | Apr. 30, 2012 Mendota Properties LLC [Member] | Apr. 30, 2013 IRET-1715 YDR, LLC [Member] | Apr. 30, 2012 IRET-1715 YDR, LLC [Member] | Apr. 30, 2013 IRET-Williston Garden Apartments, LLC [Member] | Apr. 30, 2012 IRET-Williston Garden Apartments, LLC [Member] | Apr. 30, 2013 IRET - Jamestown Medical Building, LLC [Member] | Apr. 30, 2012 IRET - Jamestown Medical Building, LLC [Member] | Apr. 30, 2013 WRH Holding, LLC [Member] | Apr. 30, 2012 WRH Holding, LLC [Member] | Apr. 30, 2013 IRET-Cypress Court Apartments, LLC [Member] | Apr. 30, 2012 IRET-Cypress Court Apartments, LLC [Member] | Apr. 30, 2013 IRET - Minot Apartments, LLC [Member] | Oct. 31, 2012 IRET - Minot Apartments, LLC [Member] | Apr. 30, 2012 IRET - Minot Apartments, LLC [Member] | Apr. 30, 2013 IRET - WRH 1, LLC [Member] | Apr. 30, 2012 IRET - WRH 1, LLC [Member] | Apr. 30, 2013 Commons at Southgate - Minot, ND [Member] | Apr. 30, 2013 Landing at Southgate - Minot, ND [Member]
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling interests - consolidated real estate entities | $ 26,055,000 | $ 13,564,000 | $ 7,236,000 | $ 7,460,000 | $ 1,003,000 | $ 958,000 | $ 2,597,000 | $ 2,295,000 | $ 1,396,000 | $ 1,471,000 | $ 1,118,000 | $ 1,380,000 | $ 1,149,000 | $ 0 | $ 5,937,000 |  | $ 0 | $ 5,619,000 | $ 0 |  |
Number of apartment units owned | 4,865 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 341 |  |  |  |  |
Number of 36 unit buildings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3
Number of units in building | 32 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 233 | 36
Construction costs for joint venture | $ 52,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of cost financed with debt (in hundredths) | 69.00% |  |  |  |  |  |  |  |  |  |  |  |  |  | 7.00% |  |  |  |  |  |
Ownership percentage (in hundredths) | 51.00% |  |  |  |  |  |  |  |  |  |  |  |  |  | 49.00% |  |  |  |  |  |

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