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EARNINGS PER SHARE (Details) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Apr. 30, 2018 USD ($) $ / shares | Jan. 31, 2018 USD ($) $ / shares | Oct. 31, 2017 USD ($) $ / shares | Jul. 31, 2017 USD ($) $ / shares | Apr. 30, 2017 USD ($) $ / shares | Jan. 31, 2017 USD ($) $ / shares | Oct. 31, 2016 USD ($) $ / shares | Jul. 31, 2016 USD ($) $ / shares | Apr. 30, 2018 USD ($) $ / shares shares | Apr. 30, 2017 USD ($) $ / shares shares | Apr. 30, 2016 USD ($) $ / shares shares
Earnings Per Share [Abstract] |  |  |  |  |  |  |  |  |  |  |
Ratio of units exchanged for shares |  |  |  |  |  |  |  |  | 1 |  |
Net Income (Loss) Attributable to Parent [Abstract] |  |  |  |  |  |  |  |  |  |  |
Income (loss) from continuing operations – Investors Real Estate Trust |  |  |  |  |  |  |  |  | $ (30,266) | $ (24,473) | $ 11,553
Income from discontinued operations – Investors Real Estate Trust |  |  |  |  |  |  |  |  | 147,054 | 67,820 | 60,453
Net income attributable to Investors Real Estate Trust | $ (20,874) | $ 136,105 | $ 12,821 | $ (11,264) | $ 30,280 | $ 23,110 | $ 11,600 | $ (21,643) | 116,788 | 43,347 | 72,006
Dividends to preferred shareholders |  |  |  |  |  |  |  |  | (8,569) | (10,546) | (11,514)
Redemption of preferred shares |  |  |  |  |  |  |  |  | (3,657) | (1,435) | 0
NET INCOME AVAILABLE TO COMMON SHAREHOLDERS | $ (22,579) | $ 134,331 | $ 6,360 | $ (13,550) | $ 27,994 | $ 19,172 | $ 8,722 | $ (24,522) | 104,562 | 31,366 | 60,492
Noncontrolling interests – Operating Partnership |  |  |  |  |  |  |  |  | 12,702 | 4,059 | 7,032
Numerator for diluted earnings per share |  |  |  |  |  |  |  |  | $ 117,264 | $ 35,425 | $ 67,524
DENOMINATOR |  |  |  |  |  |  |  |  |  |  |
Denominator for basic earnings per share weighted average shares (in shares) | shares |  |  |  |  |  |  |  |  | 119,977 | 121,169 | 123,094
Effect of convertible operating partnership units (in shares) | shares |  |  |  |  |  |  |  |  | 14,617 | 16,130 | 14,278
Denominator for diluted earnings per share (in shares) | shares |  |  |  |  |  |  |  |  | 134,594 | 137,299 | 137,372
Earnings (loss) per common share from continuing operations – Investors Real Estate Trust – basic and diluted (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  | $ (0.36) | $ (0.30) | $ 0.00
Earnings per common share from discontinued operations – Investors Real Estate Trust – basic and diluted (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  | 1.23 | 0.56 | 0.49
NET INCOME PER COMMON SHARE – BASIC & DILUTED (in dollars per share) | $ / shares | $ (0.19) | $ 1.12 | $ 0.05 | $ (0.11) | $ 0.23 | $ 0.16 | $ 0.07 | $ (0.20) | $ 0.87 | $ 0.26 | $ 0.49

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