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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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