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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