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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