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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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