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SHAREHOLDERS’ EQUITY (Details) - USD ($) |  |  | 12 Months Ended
--- | --- | --- | ---
Dec. 05, 2017 | Dec. 07, 2016 | Apr. 30, 2018 | Apr. 30, 2017
Class of Stock [Line Items] |  |  |  |
Noncontrolling interests - Operating Partnership (in shares) |  |  | 14,099,434 | 15,617,216
Conversion of Units to Common Shares. [Abstract] |  |  |  |
Units converted to common stock (in shares) |  |  | 1,500,000 | 165,000
Units converted to common stock |  |  | $ 8,800,000 | $ 966,000
Units converted to common stock, unit price (in dollars per share) |  |  | $ 5.89 | $ 5.84
Equity Awards |  |  |  |
Common shares outstanding (in shares) |  |  | 119,525,975 | 121,199,299
Share Repurchase Program [Member] |  |  |  |
Share Repurchase Program |  |  |  |
Authorized share repurchase amount |  | $ 50,000,000 |  |
Repurchase period | 1 year | 1 year |  |
Shares repurchased and retired (in shares) |  |  | 1,800,000 | 778,000
Shares repurchased and retired |  |  | $ 9,900,000 | $ 4,500,000
Share price (in dollars per share) |  |  | $ 5.56 | $ 5.77
2015 Incentive Plan [Member] |  |  |  |
Equity Awards |  |  |  |
Forfeited (in shares) |  |  | 32,000 | 274,000
2015 Incentive Plan [Member] | Performance Shares [Member] |  |  |  |
Equity Awards |  |  |  |
Issued (in shares) |  |  | 93,000 | 604,000
Grant-date value |  |  | $ 536,000 | $ 2,600,000
2008 Incentive Award Plan [Member] | Performance Shares [Member] |  |  |  |
Equity Awards |  |  |  |
Issued (in shares) |  |  |  | 59,000
Grant-date value |  |  |  | $ 352,000
Series C Preferred Stock [Member] |  |  |  |
Cumulative Redeemable Preferred Shares of Beneficial Interest [Abstract] |  |  |  |
Preferred shares issued (in shares) |  |  | 4,118,460 | 0
Distribution rate percentage |  |  | 6.625% |
Series B Preferred Stock [Member] |  |  |  |
Cumulative Redeemable Preferred Shares of Beneficial Interest [Abstract] |  |  |  |
Preferred shares issued (in shares) |  |  | 0 | 4,600,000
Distribution rate percentage |  |  | 7.95% |
Shares redeemed (in shares) |  |  | 4,600,000 |
Series A Preferred Stock [Member] |  |  |  |
Cumulative Redeemable Preferred Shares of Beneficial Interest [Abstract] |  |  |  |
Distribution rate percentage |  |  |  | 8.25%
Aggregate redemption price |  |  |  | $ 29,200,000
Exercise of Exchange Rights [Member] |  |  |  |
Conversion of Units to Common Shares. [Abstract] |  |  |  |
Units converted to common stock (in shares) |  |  |  | 503,000
Units converted to common stock |  |  |  | $ 875,000

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