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EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Apr. 30, 2017 | Jan. 31, 2017 | Oct. 31, 2016 | Jul. 31, 2016 | Apr. 30, 2016 | Jan. 31, 2016 | Oct. 31, 2015 | Jul. 31, 2015 | Apr. 30, 2017 | Apr. 30, 2016 | Apr. 30, 2015
EARNINGS PER SHARE [Abstract] |  |  |  |  |  |  |  |  |  |  |
Ratio of units exchanged for shares |  |  |  |  |  |  |  |  | one-for-one basis |  |
NUMERATOR [Abstract] |  |  |  |  |  |  |  |  |  |  |
(Loss) income from continuing operations – Investors Real Estate Trust |  |  |  |  |  |  |  |  | $ (17,340) | $ 18,651 | $ 14,083
Income from discontinued operations - Investors Real Estate Trust |  |  |  |  |  |  |  |  | 60,687 | 53,355 | 10,004
Net income attributable to Investors Real Estate Trust | $ 30,280 | $ 23,110 | $ 11,600 | $ (21,643) | $ 11,003 | $ 39,797 | $ 16,666 | $ 4,540 | 43,347 | 72,006 | 24,087
Dividends to preferred shareholders |  |  |  |  |  |  |  |  | (10,546) | (11,514) | (11,514)
Redemption of preferred shares |  |  |  |  |  |  |  |  | (1,435) |  |
NET INCOME AVAILABLE TO COMMON SHAREHOLDERS | $ 27,994 | $ 19,172 | $ 8,722 | $ (24,522) | $ 8,125 | $ 36,918 | $ 13,788 | $ 1,661 | 31,366 | 60,492 | 12,573
Noncontrolling interests - Operating Partnership |  |  |  |  |  |  |  |  | 4,059 | 7,032 | 1,526
Numerator for diluted (loss) earnings per share |  |  |  |  |  |  |  |  | $ 35,425 | $ 67,524 | $ 14,099
DENOMINATOR [Abstract] |  |  |  |  |  |  |  |  |  |  |
Denominator for basic earnings per share weighted average shares (in shares) |  |  |  |  |  |  |  |  | 121,169 | 123,094 | 118,004
Effect of convertible operating partnership units (in shares) |  |  |  |  |  |  |  |  | 16,130 | 14,278 | 16,594
Denominator for diluted earnings per share (in shares) |  |  |  |  |  |  |  |  | 137,299 | 137,372 | 134,598
(Loss) earnings per common share from continuing operations - Investors Real Estate Trust - basic and diluted (in dollars per share) |  |  |  |  |  |  |  |  | $ (0.24) | $ 0.06 | $ 0.02
Earnings per common share from discontinued operations - Investors Real Estate Trust - basic and diluted (in dollars per share) |  |  |  |  |  |  |  |  | 0.50 | 0.43 | 0.09
NET INCOME PER COMMON SHARE – BASIC & DILUTED | $ 0.23 | $ 0.16 | $ 0.07 | $ (0.20) | $ 0.07 | $ 0.30 | $ 0.11 | $ 0.01 | $ 0.26 | $ 0.49 | $ 0.11

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