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SHAREHOLDERS' EQUITY - Narrative (Details) |  |  |  |  | 3 Months Ended | 6 Months Ended | 55 Months Ended |  |  |  |  |  |
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Apr. 26, 2023 shares | Nov. 17, 2022 USD ($) $ / shares shares | Jul. 18, 2021 | Feb. 04, 2020 USD ($) sales_agent | Sep. 30, 2023 USD ($) $ / shares shares | Sep. 30, 2022 USD ($) $ / shares shares | Sep. 30, 2023 USD ($) $ / shares shares | Sep. 30, 2022 USD ($) $ / shares shares | Sep. 30, 2023 USD ($) $ / shares shares | Aug. 02, 2022 USD ($) | Aug. 01, 2022 USD ($) | Aug. 31, 2021 USD ($) | Jul. 28, 2021 USD ($) | May 26, 2021 USD ($) | Mar. 04, 2019 USD ($)
Subsidiary or Equity Method Investee [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repurchase authorized amount |  |  |  |  |  |  |  |  |  |  |  | $ 20,000,000 | $ 20,000,000 |  |
Cancellation of treasury stock (in shares) | shares | 2,339,512 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Equity Offering |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiary or Equity Method Investee [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares sold (in shares) | shares |  | 2,534,436 |  |  |  |  |  |  |  |  |  |  |  |  |
Par value, common stock (in usd per share) | $ / shares |  | $ 18.15 |  |  |  |  |  |  |  |  |  |  |  |  |
Gross proceeds received (in thousands) |  | $ 46,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Net proceeds received |  | $ 44,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Equity ATM Program |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiary or Equity Method Investee [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares sold (in shares) | shares |  |  |  |  | 1,100,000 | 1,381,716 | 3,627,458 | 3,644,568 | 20,240,580 |  |  |  |  |  |
Gross proceeds received (in thousands) |  |  |  |  | $ 22,844,000 | $ 26,913,000 | $ 68,416,000 | $ 73,666,000 | $ 413,100,000 |  |  |  |  |  |
Net proceeds received |  |  |  |  | $ 22,501,000 | $ 26,509,000 | $ 67,390,000 | $ 72,561,000 | $ 406,500,000 |  |  |  |  |  |
Maximum consideration threshold |  |  |  | $ 100,000,000 |  |  |  |  |  | $ 650,000,000 | $ 250,000,000 |  |  | $ 250,000,000 | $ 50,000,000
Number of additional sales agents | sales_agent |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |
Gross sales commission percentage |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.50% | 2.00%
Weighted average price per share (in usd per share) | $ / shares |  |  |  |  | $ 20.77 | $ 19.48 | $ 18.86 | $ 20.21 | $ 20.41 |  |  |  |  |  |
Available under the Equity ATM Program |  |  |  |  | $ 236,900,000 |  | $ 236,900,000 |  | $ 236,900,000 |  |  |  |  |  |
2010 Plan | Restricted Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiary or Equity Method Investee [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Right to grant period |  |  | 10 years |  |  |  |  |  |  |  |  |  |  |  |

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