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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, 2023	Sep. 30, 2022	Sep. 30, 2021
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				$ 27,400	$ 47,400
Proceeds from sale of long-term investments				0	22,042	$ 0
Gain on investment securities				11,299	$ 57,937	$ 6,727
Unrealized loss on investments				$ 4,200
Convertible Debt | Galileo Technologies
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)			159,700,000			159,700,000
Investments lockup period (in years)			3 years
ADNOC Drilling | ADNOC Drilling
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Ownership percentage (as a percent)			1.00%			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
Tamboran Resources Limited
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
Tamboran Resources Limited | Tamboran Resources Limited
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Ownership percentage (as a percent)				6.20%
Galileo Technologies
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Payments to acquire investments		$ 33,000

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