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FAIR VALUES OF FINANCIAL INSTRUMENTS - Quantitative Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024
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	4,599,269	4,036,490
Level 3 | Valuation, Market Approach
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value	$ 32,321	7,652
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)	31.00%
Nonrecurring
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value	$ 32,321	7,652
Nonrecurring | Commercial finance
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value	32,321	7,652
Nonrecurring | Level 1
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value	0	0
Nonrecurring | Level 1 | Commercial finance
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value	0	0
Nonrecurring | Level 2
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value	0	0
Nonrecurring | Level 2 | Commercial finance
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value	0	0
Nonrecurring | Level 3
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value	32,321	7,652
Nonrecurring | Level 3 | Commercial finance
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value	$ 32,321	$ 7,652

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