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EARNINGS PER SHARE (Details)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended
Jul. 31, 2018
USD ($)
$ / shares
shares
Jul. 31, 2017
USD ($)
$ / shares
shares
Earnings Per Share [Abstract]    
Ratio of units exchanged for shares 1  
NUMERATOR    
Income (loss) from continuing operations – controlling interests $ 2,405 $ (13,651)
Income from discontinued operations – controlling interests 511 2,387
Net income (loss) attributable to controlling interests 2,916 (11,264)
Dividends to preferred shareholders (1,705) (2,286)
Redemption of preferred shares 0 0
NET INCOME (LOSS) AVAILABLE TO COMMON SHAREHOLDERS 1,211 (13,550)
Noncontrolling interests – Operating Partnership 135 (1,644)
Numerator for diluted earnings per share $ 1,346 $ (15,194)
DENOMINATOR    
Denominator for basic earnings per share weighted average shares (in shares) | shares 119,245 120,421
Effect of redeemable operating partnership units (in shares) | shares 14,026 15,128
Denominator for diluted earnings per share (in shares) | shares 133,271 135,549
Earnings (loss) per common share from continuing operations – basic and diluted (in dollars per share) | $ / shares $ 0.01 $ (0.13)
Earnings per common share from discontinued operations – basic and diluted (in dollars per share) | $ / shares 0.00 0.02
NET EARNINGS (LOSS) PER COMMON SHARE – BASIC & DILUTED (in dollars per share) | $ / shares $ 0.01 $ (0.11)
Performance Shares [Member]    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Antidilutive securities excluded (in shares) | shares 248 115