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2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule of Financial Instruments (Details) - USD ($)
$ in Thousands
Jun. 30, 2025
Mar. 31, 2025
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Sep. 30, 2023
Net Investment Income [Line Items]            
Cash equivalents $ 34,553     $ 126,141    
Receivable from bitcoin collateral 271,491          
Bitcoin 1,079,754 [1] $ 979,635 $ 431,661 $ 413,033 [1] $ 357,981 $ 56,241
ILAL derivative asset 7,843   1,832      
Amount            
Net Investment Income [Line Items]            
Cash equivalents [2] 27,375   120,639      
Receivable from bitcoin collateral [3] 271,491   77,827      
Bitcoin 1,079,754   431,661      
Bitcoin derivative - Bitmain contracts 7,717          
ILAL derivative asset 126   1,832      
Investment in debt security 4,405   918      
Interest rate swap derivative 86   100      
Warrant liabilities 150          
Level 1            
Net Investment Income [Line Items]            
Cash equivalents [2] 27,375   120,639      
Receivable from bitcoin collateral [3] 0   0      
Bitcoin 1,079,754   431,661      
Bitcoin derivative - Bitmain contracts 0          
ILAL derivative asset 0   0      
Investment in debt security 0   0      
Interest rate swap derivative 0   0      
Warrant liabilities 0          
Level 2            
Net Investment Income [Line Items]            
Cash equivalents [2] 0   0      
Receivable from bitcoin collateral [3] 271,491   77,827      
Bitcoin 0   0      
Bitcoin derivative - Bitmain contracts 0          
ILAL derivative asset 0   0      
Investment in debt security 0   0      
Interest rate swap derivative 86   100      
Warrant liabilities 150          
Level 3            
Net Investment Income [Line Items]            
Cash equivalents [2] 0   0      
Receivable from bitcoin collateral [3] 0   0      
Bitcoin 0   0      
Bitcoin derivative - Bitmain contracts 7,717          
ILAL derivative asset 126   1,832      
Investment in debt security 4,405   918      
Interest rate swap derivative 0   $ 0      
Warrant liabilities $ 0          
[1] Includes Bitcoin - current of $877,067 and Bitcoin - noncurrent of $202,687 as presented within condensed consolidated balance sheets as of June 30, 2025.
[2] Represents money market funds.
[3] See Note 4 - Bitcoin for more information.