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INVESTMENTS - Narrative (Details) - USD ($) | 12 Months Ended
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Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2022
Investments, Debt and Equity Securities [Abstract] |  |  |
Other-than-temporary impairment charges recognized in earnings | $ 0 | $ 0 | $ 0
Realized gains (losses) from sale of available-for-sale securities | 0 | $ 0 | $ (300,000)
Income tax benefit from reclassification adjustment | $ 100,000 |  |

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- Definition Amount of realized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 9 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-9 + Details
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