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FAIR VALUE MEASUREMENT OF FINANCIAL INSTRUMENTS - Narrative (Details) - USD ($)
$ in Thousands
 1 Months Ended 12 Months Ended
Oct. 31, 2022
Apr. 30, 2022
Sep. 30, 2021
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Gain (loss) resulting from the change in the fair value of investments       $ 30,900 $ 27,400 $ 47,400
Proceeds from sale of long-term investments       0 0 22,042
Gain on investment securities       (13,953) (11,299) $ (57,937)
Depository beneficial interests 0.50%          
Convertible notes       $ 9,400    
Convertible notes (in shares)       500,000    
Equity method investments, lockup period       180 days    
Investment shares       1,000,000    
Unrealized loss on investments       $ 1,600 (4,200)  
Nonrecurring Fair Value Measurements            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Equity security investments       4,300    
Debt security investments       $ 300    
Nonrecurring Fair Value Measurements | Level 3            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Geothermal equity securities         2,400  
Convertible Debt | Investment in Galileo, net            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Interest rate (as a percent)   5.00%        
Other | Nonrecurring Fair Value Measurements            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Equity security investments         3,000  
Equity securities measured at cost         600  
Investment in ADNOC Drilling            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Payments to acquire investments     $ 100,000      
Investment balance (in shares)     159,700,000      
Investments lockup period (in years)     3 years      
Investment in ADNOC Drilling | Investment in ADNOC Drilling            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Ownership percentage (as a percent)     1.00%      
Schlumberger, Ltd            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Sale of equity securities, number of shares sold (in shares)           467,500
Proceeds from sale of long-term investments           $ 22,000
Gain on investment securities           (8,200)
Gain (loss) on sale of investment securities           500
Gain (loss) on valuation adjustment of investment           $ 7,700
Investment in Tamboran            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Payments to acquire investments $ 14,100          
Investment shares acquired (in shares) 106,000,000          
Investment in Tamboran | Tamboran Corp            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Ownership percentage (as a percent)       7.20%    
Investment in Galileo, net            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Payments to acquire investments   $ 33,000        
Gain on investment securities       $ 10,200    
Geothermal debt securities, net | Nonrecurring Fair Value Measurements            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Equity security investments       25,800 $ 25,200  
Geothermal equity securities       100    
Equity securities measured at cost       $ 25,700