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2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Fair Value of Financial Instruments (Details) - USD ($)
$ in Thousands
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
Net Investment Income [Line Items]      
Bitcoin $ 431,661 $ 56,241 $ 11,147
ILAL derivative asset 1,832 2,697  
Amount [Member]      
Net Investment Income [Line Items]      
Cash equivalents [1] 120,639    
Receivable from Bitcoin Collateral [2] 77,827    
Bitcoin 431,661    
ILAL derivative asset 1,932 2,697  
Investment in debt security 918 726  
Interest rate swap derivative (100)    
Total 632,877 3,423  
Level 1      
Net Investment Income [Line Items]      
Cash equivalents [1] 120,639    
Receivable from Bitcoin Collateral [2] 0    
Bitcoin 431,661    
ILAL derivative asset 0 0  
Investment in debt security 0 0  
Interest rate swap derivative 0    
Total 552,300 0  
Level 2      
Net Investment Income [Line Items]      
Cash equivalents [1] 0    
Receivable from Bitcoin Collateral [2] 77,827    
Bitcoin 0    
ILAL derivative asset 0 0  
Investment in debt security 0 0  
Interest rate swap derivative (100)    
Total 77,727 0  
Level 3      
Net Investment Income [Line Items]      
Cash equivalents [1] 0    
Receivable from Bitcoin Collateral [2] 0    
Bitcoin 0    
ILAL derivative asset 1,932 2,697  
Investment in debt security 918 726  
Interest rate swap derivative 0    
Total $ 2,850 $ 3,423  
[1]

(1) Represents money market funds.
[2]

(2) See Note 12 - Loans for more information.