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BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES (Details) (USD $) | 6 Months Ended |  | 3 Months Ended | 6 Months Ended |  | 3 Months Ended | 6 Months Ended |  |
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Oct. 31, 2012 | Oct. 31, 2011 | Apr. 30, 2012 | Oct. 31, 2012 Acquired below-market leases and acquired above-market leases [Member] | Oct. 31, 2011 Acquired below-market leases and acquired above-market leases [Member] | Oct. 31, 2012 Acquired below-market leases and acquired above-market leases [Member] | Oct. 31, 2011 Acquired below-market leases and acquired above-market leases [Member] | Apr. 30, 2012 Acquired below-market leases and acquired above-market leases [Member] | Oct. 31, 2012 Other identified intangible assets [Member] | Oct. 31, 2011 Other identified intangible assets [Member] | Oct. 31, 2012 Other identified intangible assets [Member] | Oct. 31, 2011 Other identified intangible assets [Member] | Apr. 30, 2011 Other identified intangible assets [Member] | Oct. 31, 2012 Dacotah Bank, Minot, North Dakota [Member] | Oct. 31, 2012 United Community Bank, Minot, North Dakota [Member] | Oct. 31, 2012 Commerce Bank, A Minnesota Banking Corporation [Member] | Oct. 31, 2012 First International Bank, Watford City, North Dakota [Member] | Oct. 31, 2012 Peoples State Bank of Velva, North Dakota [Member] | Oct. 31, 2012 Equity Bank, Minnetonka, Minnesota [Member] | Oct. 31, 2012 Associated Bank, Green Bay, Wisconsin [Member] | Oct. 31, 2012 Venture Bank, Eagan, Minnesota [Member] | Oct. 31, 2012 American National Bank, Omaha, Nebraska [Member] | Oct. 31, 2012 United Community Bank and Equity Bank [Member]
BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest in common units in operating partnership (in hundredths) | 81.40% |  | 81.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest in preferred units in operating partnership (in hundredths) | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redemption basis | one-for-one |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redemptions by limited partner, maximum | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of units to redeem, minimum (in units) | 1,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Period to hold the beneficial interest, minimum | 1 year |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of retail property | $ 0 | $ 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill impairment | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Compensating Balances [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Compensating balances |  |  |  |  |  |  |  |  |  |  |  |  |  | 350,000,000 | 275,000,000 | 250,000,000 | 6,100,000 | 225,000,000 | 300,000,000 | 500,000,000 | 500,000,000 | 400,000,000 |
Certificates of deposit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 637,000,000
Remaining terms of certificates of deposit | 2 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Decrease in lender holdbacks | 1,018,000 | 5,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
IDENTIFIED INTANGIBLE ASSETS AND INTANGIBLE LIABILITIES AND GOODWILL [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-lived Intangible Assets Acquired | 813,000,000 | 416,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Addition to intangible liabilities | 0 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average lives of intangible assets and intangible liabilities | 6 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets, Gross, Total | 67,860,000 |  | 92,401,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets, Accumulated Amortization | (25,579,000) |  | (47,813,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets, Net, Total | 42,281,000 |  | 44,588,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Indentified intangible liabilities, gross | 408,000 |  | 1,104,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Indentified intangible liabilities, accumulated amortization | (294,000) |  | (967,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Indentified intangible liabilities, net | 114,000 |  | 137,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization of Intangible Assets |  |  |  | (7,000,000) | (6,000,000) | (14,000,000) | (32,000,000) |  | 1,600,000 | 1,500,000 | 3,100,000 | 3,200,000 |  |  |  |  |  |  |  |  |  |  |
Estimated annual amortization [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2014 |  |  |  |  |  |  |  | 35,000 |  |  |  |  | 4,182,000 |  |  |  |  |  |  |  |  |  |
2015 |  |  |  |  |  |  |  | 18,000 |  |  |  |  | 3,825,000 |  |  |  |  |  |  |  |  |  |
2016 |  |  |  |  |  |  |  | 14,000 |  |  |  |  | 3,608,000 |  |  |  |  |  |  |  |  |  |
2017 |  |  |  |  |  |  |  | 6,000 |  |  |  |  | 3,139,000 |  |  |  |  |  |  |  |  |  |
2018 |  |  |  |  |  |  |  | (5,000) |  |  |  |  | 2,652,000 |  |  |  |  |  |  |  |  |  |
Goodwill | 1,110,000 |  | 1,120,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill impairment | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill derecognized | 10,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
RECLASSIFICATIONS [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of condominiums sold | 4 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of multi-family residential properties sold | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
INVOLUNTARY CONVERSION OF ASSETS [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of 32-unit buildings | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expensed flood and fire insurance deductibles | 400,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deductible amount for losses to be covered under insurance policy |  |  | 200,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Insurance proceeds received for flood clean up costs and redevelopment |  |  | 5,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated gain on involuntary conversion | 2,300,000 |  | 274,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Insurance proceeds received for redevelopment | 2,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Insurance proceeds received for business interruption from the flood and fire | 409,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Insurance proceeds received for total business interruption proceeds | 666,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Insurance claim on total business interruption | $ 1,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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