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FAIR VALUE OF FINANCIAL INSTRUMENTS - Quantitative Information (Details) - USD ($) $ in Thousands | 6 Months Ended |
--- | --- | ---
Mar. 31, 2026 | Sep. 30, 2025
Level 1 |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Fair value | $ 0 | $ 0
Level 2 |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Fair value | 0 | 0
Level 3 |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Fair value | 4,822,116 | 4,599,269
Level 3 | Valuation, Market Approach |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Fair value | $ 29,635 | 32,321
Level 3 | Valuation, Market Approach | Minimum | Measurement Input, Appraised Value |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Range of estimated selling cost (percentage) | 3.00% |
Level 3 | Valuation, Market Approach | Maximum | Measurement Input, Appraised Value |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Range of estimated selling cost (percentage) | 42.00% |
Nonrecurring | Commercial finance |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Fair value | $ 29,635 | 32,321
Nonrecurring | Commercial finance | Level 1 |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Fair value | 0 | 0
Nonrecurring | Commercial finance | Level 2 |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Fair value | 0 | 0
Nonrecurring | Commercial finance | Level 3 |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Fair value | $ 29,635 | $ 32,321

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