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FAIR VALUE MEASUREMENT OF FINANCIAL INSTRUMENTS - Narrative (Details) - USD ($)
$ in Thousands, shares in Millions
 1 Months Ended 3 Months Ended 12 Months Ended
Sep. 30, 2024
Oct. 31, 2022
Apr. 30, 2022
Sep. 30, 2021
Dec. 31, 2024
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                  
Investments lockup period expiration (in years) 3 years       180 days        
Gain (loss) resulting from the change in the fair value of investments             $ 30,900 $ 27,400  
Convertible notes           $ 9,400      
Convertible notes (in shares)           0.5      
Investment shares           1.0      
Unrealized loss on investments           $ 5,000 1,600 (4,200)  
Annual expense incurred for defined contribution plan           23,600 26,900 $ 25,800  
KCA Deutag                  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                  
Annual expense incurred for defined contribution plan           10,000      
Debt Securities | Level 3                  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                  
Included in earnings           (29,287) (10,167)    
Debt Securities | Level 3 | Notes Receivable                  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                  
Included in earnings           29,600      
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%            
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)                 159.7
Investments lockup period (in years)       3 years          
Increase (decrease) in equity securities, FV-NI           193,300      
Gain (loss) resulting from the change in the fair value of investments           (12,400)      
Fair value of the investment           8,400      
Equity securities, FV-NI, transaction fee associated with sale of securities           $ 4,000      
ADNOC Drilling | ADNOC Drilling                  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                  
Ownership percentage (as a percent)                 1.00%
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)   106.0              
Depository beneficial interests   0.50%              
Investment in Tamboran | Tamboran Corp                  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                  
Ownership percentage (as a percent)           610.00%      
Investment in Galileo, net                  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                  
Payments to acquire investments     $ 33,000            
Nonrecurring Fair Value Measurements                  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                  
Debt security investments $ 300         $ 200 300    
Investment in Tamboran 4,300         6,700 4,300    
Nonrecurring Fair Value Measurements | Geothermal debt securities, net                  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                  
Investment in Tamboran 25,800         $ 14,100 25,800    
Geothermal equity securities 100           100    
Equity securities measured at cost $ 25,700           $ 25,700