EARNINGS PER SHARE (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended	6 Months Ended
Oct. 31, 2013	Oct. 31, 2012	Oct. 31, 2013	Oct. 31, 2012
NUMERATOR [Abstract]
Income from continuing operations - Investors Real Estate Trust	$ 4,412	$ 5,750	$ 6,838	$ 7,064
Income from discontinued operations - Investors Real Estate Trust	4,375	2,762	5,027	3,127
Net income attributable to Investors Real Estate Trust	8,787	8,512	11,865	10,191
Dividends to preferred shareholders	(2,878)	(2,878)	(5,757)	(3,471)
Numerator for basic earnings per share - net income available to common shareholders	5,909	5,634	6,108	6,720
Noncontrolling interests - Operating Partnership	1,226	1,290	1,276	1,541
Numerator for diluted earnings per share	$ 7,135	$ 6,924	$ 7,384	$ 8,261
DENOMINATOR [Abstract]
Denominator for basic earnings per share weighted average shares	104,861	92,475	103,606	91,495
Effect of convertible operating partnership units	21,852	21,215	21,834	20,963
Denominator for diluted earnings per share	126,713	113,690	125,440	112,458
Earnings per common share from continuing operations - Investors Real Estate Trust - basic and diluted	$ 0.02	$ 0.03	$ 0.01	$ 0.04
Earnings per common share from discontinued operations - Investors Real Estate Trust - basic and diluted	$ 0.04	$ 0.03	$ 0.05	$ 0.03
NET INCOME PER COMMON SHARE - BASIC AND DILUTED	$ 0.06	$ 0.06	$ 0.06	$ 0.07

Equity impact of aggregate cash, stock, and paid-in-kind dividends declared for preferred shareholders during the period.

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Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 260

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Emerging Issues Task Force (EITF)

-Number 07-4

-Paragraph 4

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 128

-Paragraph 171

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 128

-Paragraph 40

-Subparagraph a

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 260

-SubTopic 10

-Section 45

-Paragraph 10

-URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1448-109256

Reference 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 128

-Paragraph 8

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Weighted-Average Number of Common Shares Outstanding

-URI http://asc.fasb.org/extlink&oid=6528421

+ Details

Name:	us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration