v3.26.1
6. INVESTMENTS AND DERIVATIVES - Carrying Value of all Investments (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Mar. 31, 2026
Mar. 31, 2025
Schedule of Investments [Line Items]        
(Loss) gain on derivative securities $ (4,840) $ (4,741) $ 6,955 $ (1,119)
Other comprehensive income, net of tax   $ 2,946   $ 2,978
Interest Rate Swap [Member]        
Schedule of Investments [Line Items]        
Balance, beginning [1]     (93)  
(Loss) gain on derivative securities [1]     54  
Purchased and acquired options [1]     0  
Sales and written options [1]     0  
Settlements and expiries [1]     0  
Balance, ending [1] (39)   (39)  
Bitmain Derivatives [Member]        
Schedule of Investments [Line Items]        
Balance, beginning [1]     233  
(Loss) gain on derivative securities [1]     (5,463)  
Purchased and acquired options [1]     6,513  
Sales and written options [1]     0  
Settlements and expiries [1]     0  
Balance, ending [1] 1,283   1,283  
DAM Derivative Assets [Member]        
Schedule of Investments [Line Items]        
Balance, beginning [1]     0  
(Loss) gain on derivative securities [1]     5,622  
Purchased and acquired options [1]     0  
Sales and written options [1]     (0)  
Settlements and expiries [1]     5,406  
Balance, ending [1] (216)   (216)  
DAM Derivative Liabilities [Member]        
Schedule of Investments [Line Items]        
Balance, beginning [1]     (0)  
(Loss) gain on derivative securities [1]     6,630  
Purchased and acquired options [1]     16,897  
Sales and written options [1]     33,952  
Settlements and expiries [1]     6,639  
Balance, ending [1] $ (3,786)   $ (3,786)  
[1] Balance rows presented represent assets if positive or liabilities if negative.