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EARNINGS PER SHARE (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 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
NUMERATOR [Abstract] |  |  |  |  |  |  |  |  |  |  |
Income from continuing operations - Investors Real Estate Trust |  |  |  |  |  |  |  |  | $ 19,341 | $ 7,641 | $ 3,621
Income from discontinued operations - Investors Real Estate Trust |  |  |  |  |  |  |  |  | 6,189 | 571 | 16,461
Net income attributable to Investors Real Estate Trust | 10,015 | 5,324 | 8,512 | 1,679 | 3,379 | 2,127 | 1,285 | 1,421 | 25,530 | 8,212 | 20,082
Dividends to preferred shareholders |  |  |  |  |  |  |  |  | (9,229) | (2,372) | (2,372)
Numerator for basic earnings per share - net income available to common shareholders | 7,136 | 2,445 | 5,634 | 1,086 | 2,786 | 1,534 | 692 | 828 | 16,301 | 5,840 | 17,710
Noncontrolling interests - Operating Partnership |  |  |  |  |  |  |  |  | 3,633 | 1,359 | 4,449
Numerator for diluted earnings per share |  |  |  |  |  |  |  |  | $ 19,934 | $ 7,199 | $ 22,159
DENOMINATOR [Abstract] |  |  |  |  |  |  |  |  |  |  |
Denominator for basic earnings per share weighted average shares (in shares) |  |  |  |  |  |  |  |  | 93,344 | 83,557 | 78,628
Effect of convertible operating partnership units (in shares) |  |  |  |  |  |  |  |  | 21,191 | 19,875 | 20,154
Denominator for diluted earnings per share (in shares) |  |  |  |  |  |  |  |  | 114,535 | 103,432 | 98,782
Earnings per common share from continuing operations - Investors Real Estate Trust - basic and diluted (in dollars per share) |  |  |  |  |  |  |  |  | $ 0.11 | $ 0.06 | $ 0.01
Earnings (loss) per common share from discontinued operations - Investors Real Estate Trust - basic and diluted (in dollars per share) |  |  |  |  |  |  |  |  | $ 0.06 | $ 0.01 | $ 0.21
NET INCOME PER COMMON SHARE - BASIC AND DILUTED (in dollars per share) | $ 0.07 | $ 0.03 | $ 0.06 | $ 0.01 | $ 0.03 | $ 0.02 | $ 0.01 | $ 0.01 | $ 0.17 | $ 0.07 | $ 0.22

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- Definition Total equity impact of aggregate cash, stock, and paid-in-kind dividends declared for preferred shareholders during the period. + References No definition available. + Details
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- Definition The amount of net income or loss for the period per each share in instances when basic and diluted earnings per share are the same amount and reported as a single line item on the face of the financial statements. Basic earnings per share is the amount of net income or loss for the period per each share of common stock or unit outstanding during the reporting period. Diluted earnings per share includes the amount of net income or loss for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period. + References No definition available. + Details
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- Definition 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
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