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EQUITY - Equity Awards (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jan. 31, 2018 | Jan. 31, 2017 | Jan. 31, 2018 | Jan. 31, 2017 | Apr. 30, 2017
Equity |  |  |  |  |
Noncontrolling interests - Operating Partnership (in shares) | 14,168,000 |  | 14,168,000 |  | 15,617,000
Common stock outstanding (in shares) | 120,035,000 |  | 120,035,000 |  | 121,199,000
Units converted to common stock (in shares) | 450,000 | 0 | 1,400,000 | 0 |
Aggregate cost of stock conversion | $ 2,600 |  | $ 8,600 |  |
Average price of shares issued (in dollars per share) | $ 5.77 |  | $ 5.92 |  |
2015 Incentive Plan [Member] |  |  |  |  |
Equity |  |  |  |  |
Equity awards issued (in shares) | 0 | 0 | 75,000 | 499,000 |
Total grant-date value shares issued |  |  | $ 445 | $ 1,900 |

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