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FAIR VALUE MEASUREMENT OF FINANCIAL INSTRUMENTS - Schedule of Assets Measured at Fair Value (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Sep. 30, 2023
Short-term investments:
Total short-term investments	$ 83,390	$ 93,600
Nonrecurring fair value measurements
Total	247,035	239,145
Geothermal Investments
Liabilities
Equity securities	27,200	25,200
Recurring Fair Value Measurements
Long-term Investments:
Non-qualified supplemental savings plan	16,165	14,597
Nonrecurring fair value measurements
Total	244,070	236,715
Liabilities
Contingent consideration	14,000	9,455
Recurring Fair Value Measurements | ADNOC Drilling
Long-term Investments:
Equity securities, investment	172,620	174,758
Recurring Fair Value Measurements | Tamboran Resources Limited
Long-term Investments:
Equity securities, investment	11,734	9,920
Recurring Fair Value Measurements | Galileo Technologies
Long-term Investments:
Debt securities, investment	36,301	35,434
Recurring Fair Value Measurements | Geothermal Investments
Long-term Investments:
Debt securities, investment	2,000	2,006
Recurring Fair Value Measurements | Other
Long-term Investments:
Debt securities, investment	5,250
Fair Value, Nonrecurring
Nonrecurring fair value measurements
Other equity securities	2,965	2,430
Total	2,965	2,430
Liabilities
Debt security investments	200
Fair Value, Nonrecurring | Other
Long-term Investments:
Equity securities, investment		3,000
Liabilities
Equity securities		600
Level 1
Short-term investments:
Total short-term investments	44,634	44,836
Nonrecurring fair value measurements
Total	205,519	199,275
Level 1 | Recurring Fair Value Measurements
Long-term Investments:
Non-qualified supplemental savings plan	16,165	14,597
Nonrecurring fair value measurements
Total	205,519	199,275
Liabilities
Contingent consideration	0	0
Level 1 | Recurring Fair Value Measurements | ADNOC Drilling
Long-term Investments:
Equity securities, investment	172,620	174,758
Level 1 | Recurring Fair Value Measurements | Tamboran Resources Limited
Long-term Investments:
Equity securities, investment	11,734	9,920
Level 1 | Recurring Fair Value Measurements | Galileo Technologies
Long-term Investments:
Debt securities, investment	0	0
Level 1 | Recurring Fair Value Measurements | Geothermal Investments
Long-term Investments:
Debt securities, investment	0	0
Level 1 | Recurring Fair Value Measurements | Other
Long-term Investments:
Debt securities, investment	5,000
Level 1 | Fair Value, Nonrecurring
Nonrecurring fair value measurements
Other equity securities	0	0
Total	0	0
Level 2
Short-term investments:
Total short-term investments	38,756	48,764
Nonrecurring fair value measurements
Total	0	0
Level 2 | Recurring Fair Value Measurements
Long-term Investments:
Non-qualified supplemental savings plan	0	0
Nonrecurring fair value measurements
Total	0	0
Liabilities
Contingent consideration	0	0
Level 2 | Recurring Fair Value Measurements | ADNOC Drilling
Long-term Investments:
Equity securities, investment	0	0
Level 2 | Recurring Fair Value Measurements | Tamboran Resources Limited
Long-term Investments:
Equity securities, investment	0	0
Level 2 | Recurring Fair Value Measurements | Galileo Technologies
Long-term Investments:
Debt securities, investment	0	0
Level 2 | Recurring Fair Value Measurements | Geothermal Investments
Long-term Investments:
Debt securities, investment	0	0
Level 2 | Recurring Fair Value Measurements | Other
Long-term Investments:
Debt securities, investment	0
Level 2 | Fair Value, Nonrecurring
Nonrecurring fair value measurements
Other equity securities	0	0
Total	0	0
Level 3
Short-term investments:
Total short-term investments	0	0
Nonrecurring fair value measurements
Total	41,516	39,870
Level 3 | Recurring Fair Value Measurements
Long-term Investments:
Non-qualified supplemental savings plan	0	0
Debt securities, investment	36,301
Nonrecurring fair value measurements
Total	38,551	37,440
Liabilities
Contingent consideration	14,000	9,455
Level 3 | Recurring Fair Value Measurements | ADNOC Drilling
Long-term Investments:
Equity securities, investment	0	0
Level 3 | Recurring Fair Value Measurements | Tamboran Resources Limited
Long-term Investments:
Equity securities, investment	0	0
Level 3 | Recurring Fair Value Measurements | Galileo Technologies
Long-term Investments:
Debt securities, investment	36,301	35,434
Level 3 | Recurring Fair Value Measurements | Geothermal Investments
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 | Fair Value, Nonrecurring
Nonrecurring fair value measurements
Other equity securities	2,965	2,430
Total	2,965	2,430
Liabilities
Equity securities, fair value		2,400
Corporate and municipal debt securities
Short-term investments:
Total short-term investments	38,756	48,764
Corporate and municipal debt securities | Level 1
Short-term investments:
Total short-term investments	0	0
Corporate and municipal debt securities | Level 2
Short-term investments:
Total short-term investments	38,756	48,764
Corporate and municipal 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	44,634	44,836
U.S. government and federal agency securities | Level 1
Short-term investments:
Total short-term investments	44,634	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

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