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OPERATING SEGMENTS (Details) (USD $) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Apr. 30, 2013 | Jan. 31, 2013 | Oct. 31, 2012 | Jul. 31, 2012 | Apr. 30, 2012 | Jan. 31, 2012 | Oct. 31, 2011 | Jul. 31, 2011 | Apr. 30, 2013 | Apr. 30, 2012 | Apr. 30, 2011 | Apr. 30, 2010
Segment revenues and net operating income [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Real estate revenue | $ 67,011,000 | $ 65,976,000 | $ 64,689,000 | $ 61,730,000 | $ 59,932,000 | $ 60,291,000 | $ 59,946,000 | $ 58,909,000 | $ 259,406,000 | $ 239,078,000 | $ 234,176,000 |
Real estate expenses |  |  |  |  |  |  |  |  | 103,132,000 | 97,388,000 | 100,881,000 |
Gain on involuntary conversion |  |  |  |  |  |  |  |  | 5,084,000 | 274,000 | 0 |
Net operating income |  |  |  |  |  |  |  |  | 161,358,000 | 141,964,000 | 133,295,000 |
Depreciation/amortization |  |  |  |  |  |  |  |  | (65,270,000) | (59,642,000) | (57,759,000) |
Administrative, advisory and trustee services |  |  |  |  |  |  |  |  | (8,494,000) | (7,381,000) | (7,222,000) |
Other expenses |  |  |  |  |  |  |  |  | (2,173,000) | (1,898,000) | (1,747,000) |
Impairment of Real Estate |  |  |  |  |  |  |  |  | (305,000) | (428,000) | 0 |
Interest expense |  |  |  |  |  |  |  |  | (62,900,000) | (64,066,000) | (62,735,000) |
Interest and other income |  |  |  |  |  |  |  |  | 748,000 | 786,000 | 541,000 |
Income from continuing operations |  |  |  |  |  |  |  |  | 22,964,000 | 9,763,000 | 4,373,000 |
(Loss) Income from discontinued operations |  |  |  |  |  |  |  |  | 7,008,000 | (57,000) | 19,978,000 |
Net Income |  |  |  |  |  |  |  |  | 29,972,000 | 9,706,000 | 24,351,000 |
Segment Assets [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Property owned | 2,032,970,000 |  |  |  | 1,892,009,000 |  |  |  | 2,032,970,000 | 1,892,009,000 |  |
Less accumulated depreciation | (420,421,000) |  |  |  | (373,490,000) |  |  |  | (420,421,000) | (373,490,000) |  |
Total property owned | 1,612,549,000 |  |  |  | 1,518,519,000 |  |  |  | 1,612,549,000 | 1,518,519,000 |  |
Real Estate Held-for-sale | 0 |  |  |  | 2,067,000 |  |  |  | 0 | 2,067,000 |  |
Cash and cash equivalents | 94,133,000 |  |  |  | 39,989,000 |  |  |  | 94,133,000 | 39,989,000 | 41,191,000 | 54,791,000
Other investments | 639,000 |  |  |  | 634,000 |  |  |  | 639,000 | 634,000 |  |
Receivables and other assets | 113,948,000 |  |  |  | 114,569,000 |  |  |  | 113,948,000 | 114,569,000 |  |
Development in progress | 46,782,000 |  |  |  | 27,599,000 |  |  |  | 46,782,000 | 27,599,000 |  |
Unimproved land | 21,503,000 |  |  |  | 10,990,000 |  |  |  | 21,503,000 | 10,990,000 |  |
Total Assets | 1,889,554,000 |  |  |  | 1,714,367,000 |  |  |  | 1,889,554,000 | 1,714,367,000 |  |
Multi-Family Residential [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment revenues and net operating income [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Real estate revenue |  |  |  |  |  |  |  |  | 90,759,000 | 72,500,000 | 65,229,000 |
Real estate expenses |  |  |  |  |  |  |  |  | 38,716,000 | 33,905,000 | 33,216,000 |
Gain on involuntary conversion |  |  |  |  |  |  |  |  | 3,852,000 | 0 |  |
Net operating income |  |  |  |  |  |  |  |  | 55,895,000 | 38,595,000 | 32,013,000 |
Segment Assets [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Property owned | 659,696,000 |  |  |  | 539,783,000 |  |  |  | 659,696,000 | 539,783,000 |  |
Less accumulated depreciation | (140,354,000) |  |  |  | (128,834,000) |  |  |  | (140,354,000) | (128,834,000) |  |
Total property owned | 519,342,000 |  |  |  | 410,949,000 |  |  |  | 519,342,000 | 410,949,000 |  |
Commercial-Office [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment revenues and net operating income [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Real estate revenue |  |  |  |  |  |  |  |  | 77,162,000 | 74,334,000 | 77,747,000 |
Real estate expenses |  |  |  |  |  |  |  |  | 37,946,000 | 34,816,000 | 36,055,000 |
Gain on involuntary conversion |  |  |  |  |  |  |  |  | 0 | 0 |  |
Net operating income |  |  |  |  |  |  |  |  | 39,216,000 | 39,518,000 | 41,692,000 |
Segment Assets [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Property owned | 613,775,000 |  |  |  | 605,318,000 |  |  |  | 613,775,000 | 605,318,000 |  |
Less accumulated depreciation | (138,270,000) |  |  |  | (121,422,000) |  |  |  | (138,270,000) | (121,422,000) |  |
Total property owned | 475,505,000 |  |  |  | 483,896,000 |  |  |  | 475,505,000 | 483,896,000 |  |
Commercial-Healthcare [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment revenues and net operating income [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Real estate revenue |  |  |  |  |  |  |  |  | 61,975,000 | 64,511,000 | 64,879,000 |
Real estate expenses |  |  |  |  |  |  |  |  | 16,779,000 | 20,650,000 | 22,443,000 |
Gain on involuntary conversion |  |  |  |  |  |  |  |  | 0 | 0 |  |
Net operating income |  |  |  |  |  |  |  |  | 45,196,000 | 43,861,000 | 42,436,000 |
Segment Assets [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Property owned | 501,191,000 |  |  |  | 500,268,000 |  |  |  | 501,191,000 | 500,268,000 |  |
Less accumulated depreciation | (90,891,000) |  |  |  | (78,744,000) |  |  |  | (90,891,000) | (78,744,000) |  |
Total property owned | 410,300,000 |  |  |  | 421,524,000 |  |  |  | 410,300,000 | 421,524,000 |  |
Commercial-Industrial [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment revenues and net operating income [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Real estate revenue |  |  |  |  |  |  |  |  | 14,911,000 | 14,325,000 | 13,165,000 |
Real estate expenses |  |  |  |  |  |  |  |  | 4,255,000 | 3,549,000 | 4,328,000 |
Gain on involuntary conversion |  |  |  |  |  |  |  |  | 0 | 0 |  |
Net operating income |  |  |  |  |  |  |  |  | 10,656,000 | 10,776,000 | 8,837,000 |
Segment Assets [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Property owned | 125,772,000 |  |  |  | 119,002,000 |  |  |  | 125,772,000 | 119,002,000 |  |
Less accumulated depreciation | (23,688,000) |  |  |  | (20,693,000) |  |  |  | (23,688,000) | (20,693,000) |  |
Total property owned | 102,084,000 |  |  |  | 98,309,000 |  |  |  | 102,084,000 | 98,309,000 |  |
Commercial-Retail [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment revenues and net operating income [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Real estate revenue |  |  |  |  |  |  |  |  | 14,599,000 | 13,408,000 | 13,156,000 |
Real estate expenses |  |  |  |  |  |  |  |  | 5,436,000 | 4,468,000 | 4,839,000 |
Gain on involuntary conversion |  |  |  |  |  |  |  |  | 1,232,000 | 274,000 |  |
Net operating income |  |  |  |  |  |  |  |  | 10,395,000 | 9,214,000 | 8,317,000 |
Segment Assets [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Property owned | 132,536,000 |  |  |  | 127,638,000 |  |  |  | 132,536,000 | 127,638,000 |  |
Less accumulated depreciation | (27,218,000) |  |  |  | (23,797,000) |  |  |  | (27,218,000) | (23,797,000) |  |
Total property owned | $ 105,318,000 |  |  |  | $ 103,841,000 |  |  |  | $ 105,318,000 | $ 103,841,000 |  |

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