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ACQUISITIONS, DEVELOPMENT PROJECTS PLACED IN SERVICE AND DISPOSITIONS - Acquisitions (Details) - Acquisitions $ in Thousands | 12 Months Ended
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Apr. 30, 2018 USD ($) ft² unit | Apr. 30, 2017 USD ($)
Acquisitions and development projects placed in service [Abstract] |  |
Total acquisition costs | $ 373,050 | $ 0
Form of consideration, cash | 373,050 |
Investment allocation, land | 54,098 |
Investment allocation, building | 314,971 |
Investment allocation, intangible assets | 3,981 |
Multi-Family Residential | 191 homes - Oxbo - St Paul, MN |  |
Acquisitions and development projects placed in service [Abstract] |  |
Total acquisition costs | 61,500 |
Form of consideration, cash | 61,500 |
Investment allocation, land | 5,809 |
Investment allocation, building | 54,910 |
Investment allocation, intangible assets | $ 781 |
Number of apartment units | unit | 191 |
Area of real estate property | ft² | 11,477 |
Multi-Family Residential | 500 homes - Park Place - Plymouth, MN |  |
Acquisitions and development projects placed in service [Abstract] |  |
Total acquisition costs | $ 92,250 |
Form of consideration, cash | 92,250 |
Investment allocation, land | 10,609 |
Investment allocation, building | 80,711 |
Investment allocation, intangible assets | $ 930 |
Number of apartment units | unit | 500 |
Multi-Family Residential | 274 homes - Dylan - Denver, CO |  |
Acquisitions and development projects placed in service [Abstract] |  |
Total acquisition costs | $ 90,600 |
Form of consideration, cash | 90,600 |
Investment allocation, land | 12,155 |
Investment allocation, building | 77,249 |
Investment allocation, intangible assets | $ 1,196 |
Number of apartment units | unit | 274 |
Multi-Family Residential | 390 homes - Westend - Denver, CO |  |
Acquisitions and development projects placed in service [Abstract] |  |
Total acquisition costs | $ 128,700 |
Form of consideration, cash | 128,700 |
Investment allocation, land | 25,525 |
Investment allocation, building | 102,101 |
Investment allocation, intangible assets | $ 1,074 |
Number of apartment units | unit | 390 |

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