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FAIR VALUE MEASUREMENT OF FINANCIAL INSTRUMENTS - Schedule of Assets Measured at Fair Value (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Sep. 30, 2023
Short-term investments:
Total short-term investments	$ 292,919	$ 93,600
Recurring Fair Value Measurements
Long-term investments:
Non-qualified supplemental savings plan	15,633	14,597
Total	70,223	236,715
Liabilities
Contingent consideration		9,455
Recurring Fair Value Measurements | Investment in Tamboran
Long-term investments:
Investment in Tamboran	20,958	9,920
Recurring Fair Value Measurements | Investment in Galileo, net
Long-term investments:
Debt securities, investment	27,044	35,434
Recurring Fair Value Measurements | Geothermal debt securities, net
Long-term investments:
Debt securities, investment	2,000	2,006
Recurring Fair Value Measurements | Other
Long-term investments:
Debt securities, investment	4,588
Recurring Fair Value Measurements | Investment in ADNOC Drilling
Long-term investments:
Investment in Tamboran		174,758
Level 1
Short-term investments:
Total short-term investments	259,106	44,836
Level 1 | Recurring Fair Value Measurements
Long-term investments:
Non-qualified supplemental savings plan	15,633	14,597
Total	40,929	199,275
Liabilities
Contingent consideration		0
Level 1 | Recurring Fair Value Measurements | Investment in Tamboran
Long-term investments:
Investment in Tamboran	20,958	9,920
Level 1 | Recurring Fair Value Measurements | Investment in Galileo, net
Long-term investments:
Debt securities, investment	0	0
Level 1 | Recurring Fair Value Measurements | Geothermal debt securities, net
Long-term investments:
Debt securities, investment	0	0
Level 1 | Recurring Fair Value Measurements | Other
Long-term investments:
Debt securities, investment	4,338
Level 1 | Recurring Fair Value Measurements | Investment in ADNOC Drilling
Long-term investments:
Investment in Tamboran		174,758
Level 2
Short-term investments:
Total short-term investments	33,813	48,764
Level 2 | Recurring Fair Value Measurements
Long-term investments:
Non-qualified supplemental savings plan	0	0
Total	0	0
Liabilities
Contingent consideration		0
Level 2 | Recurring Fair Value Measurements | Investment in Tamboran
Long-term investments:
Investment in Tamboran	0	0
Level 2 | Recurring Fair Value Measurements | Investment in Galileo, net
Long-term investments:
Debt securities, investment	0	0
Level 2 | Recurring Fair Value Measurements | Geothermal debt securities, net
Long-term investments:
Debt securities, investment	0	0
Level 2 | Recurring Fair Value Measurements | Other
Long-term investments:
Debt securities, investment	0
Level 2 | Recurring Fair Value Measurements | Investment in ADNOC Drilling
Long-term investments:
Investment in Tamboran		0
Level 3
Short-term investments:
Total short-term investments	0	0
Level 3 | Recurring Fair Value Measurements
Long-term investments:
Non-qualified supplemental savings plan	0	0
Total	29,294	37,440
Liabilities
Contingent consideration		9,455
Level 3 | Recurring Fair Value Measurements | Investment in Tamboran
Long-term investments:
Investment in Tamboran	0	0
Level 3 | Recurring Fair Value Measurements | Investment in Galileo, net
Long-term investments:
Debt securities, investment	27,044	35,434
Level 3 | Recurring Fair Value Measurements | Geothermal debt securities, net
Long-term investments:
Debt securities, investment	2,000	2,006
Level 3 | Recurring Fair Value Measurements | Other
Long-term investments:
Debt securities, investment	250
Level 3 | Recurring Fair Value Measurements | Investment in ADNOC Drilling
Long-term investments:
Investment in Tamboran		0
Corporate debt securities
Short-term investments:
Total short-term investments	33,813	48,764
Corporate debt securities | Level 1
Short-term investments:
Total short-term investments	0	0
Corporate debt securities | Level 2
Short-term investments:
Total short-term investments	33,813	48,764
Corporate debt securities | Level 3
Short-term investments:
Total short-term investments	0	0
U.S. government and federal agency securities
Short-term investments:
Total short-term investments	53,490	44,836
U.S. government and federal agency securities | Level 1
Short-term investments:
Total short-term investments	53,490	44,836
U.S. government and federal agency securities | Level 2
Short-term investments:
Total short-term investments	0	0
U.S. government and federal agency securities | Level 3
Short-term investments:
Total short-term investments	0	$ 0
Investment in ADNOC Drilling
Short-term investments:
Total short-term investments	205,616
Investment in ADNOC Drilling | Level 1
Short-term investments:
Total short-term investments	205,616
Investment in ADNOC Drilling | Level 2
Short-term investments:
Total short-term investments	0
Investment in ADNOC Drilling | Level 3
Short-term investments:
Total short-term investments	$ 0

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