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EQUITY - Equity Awards (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Oct. 31, 2018 | Oct. 31, 2017 | Oct. 31, 2018 | Oct. 31, 2017 | Apr. 30, 2018
Equity |  |  |  |  |
Noncontrolling interests - Operating Partnership (in shares) | 13,678,000 |  | 13,678,000 |  | 14,099,000
Common stock outstanding (in shares) | 119,727,000 |  | 119,727,000 |  | 119,526,000
Units converted to common stock (in shares) |  |  | 91,000 | 999,500 |
Aggregate cost of stock conversion |  |  | $ 482 | $ 6,000 |
Average price of shares issued (in dollars per share) |  |  | $ 5.30 | $ 5.98 |
2015 Incentive Plan [Member] |  |  |  |  |
Equity |  |  |  |  |
Equity awards issued (in shares) | 13,000 | 0 | 56,000 | 75,000 |
Total grant-date value shares issued | $ 83 |  | $ 347 | $ 445 |
Exercise of Exchange Rights [Member] |  |  |  |  |
Equity |  |  |  |  |
Units converted to common stock (in shares) | 217,000 | 0 | 331,000 | 0 |
Aggregate cost of stock conversion | $ 358 |  | $ 649 |  |

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