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EARNINGS PER SHARE (Details)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 6 Months Ended
Oct. 31, 2018
USD ($)
$ / shares
shares
Oct. 31, 2017
USD ($)
$ / shares
shares
Oct. 31, 2018
USD ($)
$ / shares
shares
Oct. 31, 2017
USD ($)
$ / shares
shares
Earnings Per Share [Abstract]        
Ratio of units exchanged for shares     1  
NUMERATOR        
Income (loss) from continuing operations – controlling interests $ (4,558) $ (679) $ (2,153) $ (14,330)
Income (loss) from discontinued operations – controlling interests 0 13,500 511 15,887
Net income (loss) attributable to controlling interests (4,558) 12,821 (1,642) 1,557
Dividends to preferred shareholders (1,706) (2,812) (3,411) (5,098)
Redemption of preferred shares 0 (3,649) 0 (3,649)
NET INCOME (LOSS) AVAILABLE TO COMMON SHAREHOLDERS (6,264) 6,360 (5,053) (7,190)
Noncontrolling interests – Operating Partnership (722) 773 (587) (871)
Numerator for diluted earnings (loss) per share $ (6,986) $ 7,133 $ (5,640) $ (8,061)
DENOMINATOR        
Denominator for basic earnings per share weighted average shares (in shares) | shares 119,396 120,144 119,320 120,282
Effect of redeemable operating partnership units (in shares) | shares 13,789 14,623 13,924 14,912
Denominator for diluted earnings per share (in shares) | shares 133,185 134,767 133,244 135,194
Earnings (loss) per common share from continuing operations – basic and diluted (in dollars per share) | $ / shares $ (0.05) $ (0.06) $ (0.04) $ (0.19)
Earnings (loss) per common share from discontinued operations – basic and diluted (in dollars per share) | $ / shares 0.00 0.11 0.00 0.13
NET EARNINGS (LOSS) PER COMMON SHARE – BASIC & DILUTED (in dollars per share) | $ / shares $ (0.05) $ 0.05 $ (0.04) $ (0.06)
Performance Shares [Member]        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive securities excluded (in shares) | shares 253 115 253 115