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