v3.26.1
6. INVESTMENTS AND DERIVATIVES - Carrying Value of all Investments (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Schedule of Investments [Line Items]        
(Loss) gain on derivative securities $ 5,673 $ (430) $ 12,628 $ (1,549)
Other comprehensive income, net of tax   $ (223)   $ 2,755
Interest Rate Swap [Member]        
Schedule of Investments [Line Items]        
Balance, beginning [1]     (93)  
(Loss) gain on derivative securities [1]     119  
Purchased and acquired options [1]     0  
Written options [1]     0  
Settlements and expiries [1]     0  
Balance, ending [1] 26   26  
Bitmain Derivatives [Member]        
Schedule of Investments [Line Items]        
Balance, beginning [1]     233  
(Loss) gain on derivative securities [1]     (6,630)  
Purchased and acquired options [1]     6,513  
Written options [1]     0  
Settlements and expiries [1]     0  
Balance, ending [1] 116   116  
DAM Derivative Assets [Member]        
Schedule of Investments [Line Items]        
Balance, beginning [1]     0  
(Loss) gain on derivative securities [1]     5,869  
Purchased and acquired options [1]     0  
Written options [1]     0  
Settlements and expiries [1]     (5,089)  
Balance, ending [1] 780   780  
DAM Derivative Liabilities [Member]        
Schedule of Investments [Line Items]        
Balance, beginning [1]     0  
(Loss) gain on derivative securities [1]     13,158  
Purchased and acquired options [1]     20,420  
Written options [1]     (45,922)  
Settlements and expiries [1]     9,304  
Balance, ending [1] $ (3,040)   $ (3,040)  
[1] Balance rows presented represent assets if positive or liabilities if negative.