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COMMON STOCK EQUITY - NARRATIVE (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  | 1 Months Ended | 9 Months Ended
--- | --- | --- | --- | ---
May 26, 2021 | Mar. 03, 2021 | Dec. 31, 2019 | Jun. 30, 2021 | Jun. 30, 2020
Class of Stock [Line Items] |  |  |  |  |
Number of shares issued in transaction (in shares) |  |  | 6,545,454 |  |
Proceeds from issuance of common stock - public equity offering |  |  | $ 212,900 | $ 0 | $ 212,900
Forward sale agreement payout |  |  |  | $ 2,823 | $ 0
Directly Issued Common Stock |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Number of shares issued in transaction (in shares) |  |  | 5,333,334 |  |
Forward Sales Agreements |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Number of shares issued in transaction (in shares) |  |  | 1,212,120 |  |
Conversion price per share (usd per share) |  |  | $ 40.0125 |  |
Forward sale agreement payout | $ 2,400 | $ 388 |  |  |
Forward sales agreement, settlement (in shares) | 484,848 | 727,272 |  |  |

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