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SHAREHOLDERS' EQUITY - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands, shares in Millions | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2024 | Dec. 31, 2023 | Mar. 31, 2023 | Dec. 31, 2022 | Mar. 31, 2024 | Mar. 31, 2023 | Sep. 30, 2023 | Nov. 30, 2022
Stockholders' Equity Note [Abstract] |  |  |  |  |  |  |  |
Number of common shares authorized to be repurchased (in shares) |  |  |  |  |  |  |  | 4.0
Shares of common stock repurchased (in shares) | 0.1 |  | 2.5 |  | 1.4 | 3.4 |  |
Aggregate cost of repurchased shares | $ 4,000 |  | $ 106,700 |  | $ 51,600 | $ 145,800 |  |
Excise tax |  |  | $ 800 |  | 300 | $ 800 |  |
Dividends declared | $ 42,100 |  |  |  | 101,200 |  |  |
Dividends declared (in dollars per share) | $ 0.25 | $ 0.25 | $ 0.25 | $ 0.25 |  |  |  |
Dividends declared, supplemental (in dollars per share) | $ 0.17 | $ 0.34 | $ 0.235 | $ 0.47 |  |  |  |
Dividends payable | $ 42,047 |  |  |  | $ 42,047 |  | $ 25,194 |

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