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BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES, Basis of Presentation, Impairment of Long-Lived Assets and Held for Sale (Details) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jan. 31, 2016 USD ($) shares | Jan. 31, 2015 USD ($) | Jan. 31, 2016 USD ($) Property Redemption Parcel shares | Jan. 31, 2015 USD ($) Property | Apr. 30, 2015 USD ($) Property
Basis of Presentation [Abstract] |  |  |  |  |
Interest in operating partnership | 89.70% |  | 89.70% |  | 89.90%
Redemption basis |  |  | one-for-one |  |
Redemptions by limited partner, maximum | Redemption |  |  | 2 |  |
Number of units to redeem, minimum (in shares) | shares | 1,000 |  | 1,000 |  |
Period to hold the beneficial interest, minimum |  |  | 1 year |  |
Impairment of Long-Lived Assets [Abstract] |  |  |  |  |
Impairment of property |  |  | $ 3,760,000 | $ 6,105,000 |
Impairment of real estate investments | $ 162,000 | $ 540,000 | $ 3,320,000 | $ 4,663,000 |
Number of impairment properties | Property |  |  | 9 | 4 |
Held for Sale [Abstract] |  |  |  |  |
Assets held for sale | 22,064,000 |  | $ 22,064,000 |  | $ 463,103,000
Liabilities held for sale | 11,449,000 |  | $ 11,449,000 |  | $ 321,393,000
Commercial Properties [Member] |  |  |  |  |
Impairment of Long-Lived Assets [Abstract] |  |  |  |  |
Number of impairment properties | Property |  |  |  | 4 |
Unimproved Land [Member] |  |  |  |  |
Impairment of Long-Lived Assets [Abstract] |  |  |  |  |
Number of impairment properties | Property |  |  |  | 2 |
Held for Sale [Member] | Office Properties [Member] |  |  |  |  |
Held for Sale [Abstract] |  |  |  |  |
Number of properties | Property |  |  |  |  | 49
Held for Sale [Member] | Retail Properties [Member] |  |  |  |  |
Held for Sale [Abstract] |  |  |  |  |
Number of properties | Property |  |  |  |  | 17
Held for Sale [Member] | Healthcare Properties [Member] |  |  |  |  |
Held for Sale [Abstract] |  |  |  |  |
Number of properties | Property |  |  | 1 |  | 2
Held for Sale [Member] | Multifamily Properties [Member] |  |  |  |  |
Held for Sale [Abstract] |  |  |  |  |
Number of properties | Property |  |  | 8 |  |
Held for Sale [Member] | Unimproved Land [Member] |  |  |  |  |
Held for Sale [Abstract] |  |  |  |  |
Number of properties | Parcel |  |  | 1 |  |
Discontinued Operations [Member] |  |  |  |  |
Impairment of Long-Lived Assets [Abstract] |  |  |  |  |
Impairment of real estate investments | $ 0 | $ 0 | $ 440,000 | $ 1,442,000 |
Eden Prairie, Minnesota [Member] | Office Properties [Member] |  |  |  |  |
Impairment of Long-Lived Assets [Abstract] |  |  |  |  |
Impairment of property |  |  | $ 440,000,000 |  |
Number of impairment properties | Property |  |  | 1 |  |
Eden Prairie, Minnesota [Member] | Discontinued Operations [Member] | Office Properties [Member] |  |  |  |  |
Impairment of Long-Lived Assets [Abstract] |  |  |  |  |
Impairment of real estate investments |  |  | $ 440,000 |  |
Grand Chute, Wisconsin [Member] | Unimproved Land [Member] |  |  |  |  |
Impairment of Long-Lived Assets [Abstract] |  |  |  |  |
Impairment of property |  |  | $ 1,300,000 |  |
Number of impairment properties | Property |  |  | 2 |  |
St. Cloud, Minnesota [Member] | Multifamily Properties [Member] |  |  |  |  |
Impairment of Long-Lived Assets [Abstract] |  |  |  |  |
Impairment of property |  |  | $ 1,900,000 |  |
Number of impairment properties | Property |  |  | 8 |  |
Held for Sale [Abstract] |  |  |  |  |
Number of properties | Property |  |  | 8 |  |
Kalispell, Montana [Member] | Retail Properties [Member] |  |  |  |  |
Impairment of Long-Lived Assets [Abstract] |  |  |  |  |
Impairment of property |  |  |  | 2,100 |
Golden Valley, Minnesota [Member] | Office Properties [Member] |  |  |  |  |
Impairment of Long-Lived Assets [Abstract] |  |  |  |  |
Impairment of property |  |  |  | 183,000 |
Minneapolis, Minnesota [Member] | Office Properties [Member] |  |  |  |  |
Impairment of Long-Lived Assets [Abstract] |  |  |  |  |
Impairment of property |  |  |  | 1,800,000 |
Boise, Idaho [Member] | Office Properties [Member] |  |  |  |  |
Impairment of Long-Lived Assets [Abstract] |  |  |  |  |
Impairment of property |  |  |  | 1,400,000 |
River Falls, Wisconsin [Member] | Unimproved Land [Member] |  |  |  |  |
Impairment of Long-Lived Assets [Abstract] |  |  |  |  |
Impairment of property |  |  | $ 162,000 |  |
Number of impairment properties | Property |  |  | 1 |  |
Eagan, Minnesota [Member] | Unimproved Land [Member] |  |  |  |  |
Impairment of Long-Lived Assets [Abstract] |  |  |  |  |
Impairment of property |  |  |  | $ 98,000 |
Number of impairment properties | Property |  |  |  | 1 |
Weston, Wisconsin [Member] | Unimproved Land [Member] |  |  |  |  |
Impairment of Long-Lived Assets [Abstract] |  |  |  |  |
Impairment of property |  |  |  | $ 442,000 |
Number of impairment properties | Property |  |  |  | 1 |

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