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SEGMENT REPORTING (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Jan. 31, 2015	Jan. 31, 2014	Jan. 31, 2015 Segment	Jan. 31, 2014	Apr. 30, 2014	Apr. 30, 2013
SEGMENT REPORTING [Abstract]
Number of reportable segments			5us-gaap_NumberOfReportableSegments
Segment revenues and net operating income [Abstract]
Real estate revenue	$ 72,916us-gaap_RealEstateRevenueNet	$ 68,433us-gaap_RealEstateRevenueNet	$ 212,431us-gaap_RealEstateRevenueNet	$ 199,303us-gaap_RealEstateRevenueNet
Gain on involuntary conversion	0	1,514	0	2,480
TRS senior housing revenue	963us-gaap_OtherRealEstateRevenue	804us-gaap_OtherRealEstateRevenue	2,599us-gaap_OtherRealEstateRevenue	804us-gaap_OtherRealEstateRevenue
TRS senior housing expenses	(825)	(671)	(2,243)	(671)
Interest expense	(14,595)us-gaap_InterestExpense	(15,130)us-gaap_InterestExpense	(43,858)us-gaap_InterestExpense	(44,525)us-gaap_InterestExpense
Income (loss) before gain (loss) on sale of real estate and other investments and income (loss) from discontinued operations	8,200	3,604	15,633	11,132
Gain (loss) on sale of real estate and other investments	951	0	(811)	0
Income from continuing operations	9,151	3,604	14,822	11,132
Income from discontinued operations	0	465	0	6,450
NET INCOME	9,151us-gaap_ProfitLoss	4,069us-gaap_ProfitLoss	14,822us-gaap_ProfitLoss	17,582us-gaap_ProfitLoss
Segment Assets [Abstract]
Property owned	2,093,148		2,093,148		1,996,031
Less accumulated depreciation	(439,153)		(439,153)		(424,288)
Total property owned	1,653,995us-gaap_RealEstateInvestmentPropertyNet		1,653,995us-gaap_RealEstateInvestmentPropertyNet		1,571,743us-gaap_RealEstateInvestmentPropertyNet
Real Estate Held-for-sale	44,259us-gaap_RealEstateHeldforsale		44,259us-gaap_RealEstateHeldforsale		2,951us-gaap_RealEstateHeldforsale
Cash and cash equivalents	52,148	53,494	52,148	53,494	47,267	94,133
Other investments	329us-gaap_OtherLongTermInvestments		329us-gaap_OtherLongTermInvestments		329us-gaap_OtherLongTermInvestments
Receivables and other assets	108,931iret_ReceivablesAndOtherAssets		108,931iret_ReceivablesAndOtherAssets		119,458iret_ReceivablesAndOtherAssets
Development in progress	114,005us-gaap_DevelopmentInProcess		114,005us-gaap_DevelopmentInProcess		104,609us-gaap_DevelopmentInProcess
Unimproved land	27,675us-gaap_LandAvailableForDevelopment		27,675us-gaap_LandAvailableForDevelopment		22,864us-gaap_LandAvailableForDevelopment
TOTAL ASSETS	2,001,342us-gaap_Assets		2,001,342us-gaap_Assets		1,869,221us-gaap_Assets
Operating Segments [Member]
Segment revenues and net operating income [Abstract]
Real estate revenue	71,953	67,629	209,832	198,499
Real estate expenses	28,434	25,927	83,189	78,898
Gain on involuntary conversion		1,514		2,480
Net operating income	43,519	43,216	126,643	122,081
TRS senior housing revenue	963		2,599
TRS senior housing expenses	(825)		(2,243)
Depreciation/amortization	(17,750)	(17,489)	(52,474)	(53,656)
General and administrative	(3,242)	(2,935)	(10,986)	(9,572)
Impairment of real estate investments	(540)	(4,798)	(6,105)	(4,798)
Interest expense	(14,595)	(15,130)	(43,858)	(44,525)
Interest and other income	670	740	2,057	1,602
Income (loss) before gain (loss) on sale of real estate and other investments and income (loss) from discontinued operations	8,200		15,633
Gain (loss) on sale of real estate and other investments	951		(811)
Income from continuing operations		3,604		11,132
Income from discontinued operations		465		6,450
NET INCOME	9,151	4,069	14,822	17,582
Multi-Family Residential [Member]
Segment Assets [Abstract]
Property owned	932,718		932,718		753,731
Less accumulated depreciation	(172,987)		(172,987)		(158,100)
Total property owned	759,731		759,731		595,631
Multi-Family Residential [Member] \| Operating Segments [Member]
Segment revenues and net operating income [Abstract]
Real estate revenue	30,256	25,848	87,576	75,659
Real estate expenses	13,318	10,998	37,700	33,006
Gain on involuntary conversion		1,514		2,480
Net operating income	16,938	16,364	49,876	45,133
Commercial-Office [Member]
Segment Assets [Abstract]
Property owned	478,590		478,590		544,628
Less accumulated depreciation	(112,093)		(112,093)		(121,892)
Total property owned	366,497		366,497		422,736
Commercial-Office [Member] \| Operating Segments [Member]
Segment revenues and net operating income [Abstract]
Real estate revenue	19,086	19,394	56,917	58,075
Real estate expenses	9,050	9,037	27,873	28,315
Gain on involuntary conversion		0		0
Net operating income	10,036	10,357	29,044	29,760
Commercial-Healthcare [Member]
Segment Assets [Abstract]
Property owned	519,588		519,588		525,028
Less accumulated depreciation	(115,395)		(115,395)		(105,843)
Total property owned	404,193		404,193		419,185
Commercial-Healthcare [Member] \| Operating Segments [Member]
Segment revenues and net operating income [Abstract]
Real estate revenue	17,587	17,242	50,322	49,340
Real estate expenses	4,315	4,120	12,905	12,534
Gain on involuntary conversion		0		0
Net operating income	13,272	13,122	37,417	36,806
Commercial-Industrial [Member]
Segment Assets [Abstract]
Property owned	50,900		50,900		55,375
Less accumulated depreciation	(10,836)		(10,836)		(10,198)
Total property owned	40,064		40,064		45,177
Commercial-Industrial [Member] \| Operating Segments [Member]
Segment revenues and net operating income [Abstract]
Real estate revenue	1,741	1,664	4,904	5,273
Real estate expenses	501	493	1,223	1,447
Gain on involuntary conversion		0		0
Net operating income	1,240	1,171	3,681	3,826
Commercial-Retail [Member]
Segment Assets [Abstract]
Property owned	111,352		111,352		117,269
Less accumulated depreciation	(27,842)		(27,842)		(28,255)
Total property owned	83,510		83,510		89,014
Commercial-Retail [Member] \| Operating Segments [Member]
Segment revenues and net operating income [Abstract]
Real estate revenue	3,283	3,481	10,113	10,152
Real estate expenses	1,250	1,279	3,488	3,596
Gain on involuntary conversion		0		0
Net operating income	$ 2,033	$ 2,202	$ 6,625	$ 6,556