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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 | $ 66,272,000 | $ 65,221,000 | $ 63,901,000 | $ 60,975,000 | $ 59,158,000 | $ 59,516,000 | $ 59,166,000 | $ 58,127,000 | $ 256,369,000 | $ 235,967,000 | $ 231,165,000 |
Real estate expenses |  |  |  |  |  |  |  |  | 102,459,000 | 96,766,000 | 100,203,000 |
Gain on involuntary conversion |  |  |  |  |  |  |  |  | 5,084,000 | 274,000 | 0 |
Net operating income |  |  |  |  |  |  |  |  | 158,994,000 | 139,475,000 | 130,962,000 |
Depreciation/amortization |  |  |  |  |  |  |  |  | (64,399,000) | (58,737,000) | (56,852,000) |
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 |  |  |  |  |  |  |  |  | (62,268,000) | (63,250,000) | (61,913,000) |
Interest and other income |  |  |  |  |  |  |  |  | 748,000 | 786,000 | 541,000 |
Income from continuing operations |  |  |  |  |  |  |  |  | 22,408,000 | 8,995,000 | 3,769,000 |
Income from discontinued operations |  |  |  |  |  |  |  |  | 7,564,000 | 711,000 | 20,582,000 |
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 |  |  |  |  |  |  |  |  | 77,766,000 | 74,914,000 | 77,981,000 |
Real estate expenses |  |  |  |  |  |  |  |  | 38,175,000 | 34,963,000 | 36,102,000 |
Gain on involuntary conversion |  |  |  |  |  |  |  |  | 0 | 0 |  |
Net operating income |  |  |  |  |  |  |  |  | 39,591,000 | 39,951,000 | 41,879,000 |
Segment Assets [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Property owned | 625,296,000 |  |  |  | 616,743,000 |  |  |  | 625,296,000 | 616,743,000 |  |
Less accumulated depreciation | (139,324,000) |  |  |  | (121,862,000) |  |  |  | (139,324,000) | (121,862,000) |  |
Total property owned | 485,972,000 |  |  |  | 494,881,000 |  |  |  | 485,972,000 | 494,881,000 |  |
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 |  |  |  |  |  |  |  |  | 12,247,000 | 11,582,000 | 10,548,000 |
Real estate expenses |  |  |  |  |  |  |  |  | 3,750,000 | 3,063,000 | 3,811,000 |
Gain on involuntary conversion |  |  |  |  |  |  |  |  | 0 | 0 |  |
Net operating income |  |  |  |  |  |  |  |  | 8,497,000 | 8,519,000 | 6,737,000 |
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 |  |  |  |  |  |  |  |  | 13,622,000 | 12,460,000 | 12,528,000 |
Real estate expenses |  |  |  |  |  |  |  |  | 5,039,000 | 4,185,000 | 4,631,000 |
Gain on involuntary conversion |  |  |  |  |  |  |  |  | 1,232,000 | 274,000 |  |
Net operating income |  |  |  |  |  |  |  |  | 9,815,000 | 8,549,000 | 7,897,000 |
Segment Assets [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Property owned | 121,015,000 |  |  |  | 116,213,000 |  |  |  | 121,015,000 | 116,213,000 |  |
Less accumulated depreciation | (26,164,000) |  |  |  | (23,357,000) |  |  |  | (26,164,000) | (23,357,000) |  |
Total property owned | $ 94,851,000 |  |  |  | $ 92,856,000 |  |  |  | $ 94,851,000 | $ 92,856,000 |  |

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