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FAIR VALUE MEASUREMENT OF FINANCIAL INSTRUMENTS - Schedule of Assets Measured at Fair Value (Details) - USD ($) $ in Thousands | Jun. 30, 2025 | Sep. 30, 2024
--- | --- | ---
Short-term investments: |  |
Total short-term investments | $ 21,128 |
Total |  | $ 292,919
Recurring Fair Value Measurements |  |
Long-term Investments: |  |
Non-qualified supplemental savings plan | 17,436 |
Total | 82,508 | 70,223
Recurring Fair Value Measurements | Tamboran Resources Limited |  |
Long-term Investments: |  |
Investment in Tamboran | 22,218 | 15,633
Recurring Fair Value Measurements | Other |  |
Long-term Investments: |  |
Other equity securities | 1,632 | 20,958
Debt securities: | 250 | 4,588
Recurring Fair Value Measurements | Galileo Technologies |  |
Long-term Investments: |  |
Debt securities: | 38,972 | 27,044
Recurring Fair Value Measurements | Geothermal Investments |  |
Long-term Investments: |  |
Debt securities: | 2,000 | 2,000
Level 1 |  |
Short-term investments: |  |
Total short-term investments | 0 |
Total |  | 259,106
Level 1 | Recurring Fair Value Measurements |  |
Long-term Investments: |  |
Non-qualified supplemental savings plan | 17,436 |
Total | 41,286 | 40,929
Level 1 | Recurring Fair Value Measurements | Tamboran Resources Limited |  |
Long-term Investments: |  |
Investment in Tamboran | 22,218 | 15,633
Level 1 | Recurring Fair Value Measurements | Other |  |
Long-term Investments: |  |
Other equity securities | 1,632 | 20,958
Debt securities: | 0 | 4,338
Level 1 | Recurring Fair Value Measurements | Galileo Technologies |  |
Long-term Investments: |  |
Debt securities: | 0 | 0
Level 1 | Recurring Fair Value Measurements | Geothermal Investments |  |
Long-term Investments: |  |
Debt securities: | 0 | 0
Level 2 |  |
Short-term investments: |  |
Total short-term investments | 21,128 |
Total |  | 33,813
Level 2 | Recurring Fair Value Measurements |  |
Long-term Investments: |  |
Non-qualified supplemental savings plan | 0 |
Total | 0 | 0
Level 2 | Recurring Fair Value Measurements | Tamboran Resources Limited |  |
Long-term Investments: |  |
Investment in Tamboran | 0 | 0
Level 2 | Recurring Fair Value Measurements | Other |  |
Long-term Investments: |  |
Other equity securities | 0 | 0
Debt securities: | 0 | 0
Level 2 | Recurring Fair Value Measurements | Galileo Technologies |  |
Long-term Investments: |  |
Debt securities: | 0 | 0
Level 2 | Recurring Fair Value Measurements | Geothermal Investments |  |
Long-term Investments: |  |
Debt securities: | 0 | 0
Level 3 |  |
Short-term investments: |  |
Total short-term investments | 0 |
Total |  | 0
Level 3 | Recurring Fair Value Measurements |  |
Long-term Investments: |  |
Non-qualified supplemental savings plan | 0 |
Total | 41,222 | 29,294
Level 3 | Recurring Fair Value Measurements | Tamboran Resources Limited |  |
Long-term Investments: |  |
Investment in Tamboran | 0 | 0
Level 3 | Recurring Fair Value Measurements | Other |  |
Long-term Investments: |  |
Other equity securities | 0 | 0
Debt securities: | 250 | 250
Level 3 | Recurring Fair Value Measurements | Galileo Technologies |  |
Long-term Investments: |  |
Debt securities: | 38,972 | 27,044
Level 3 | Recurring Fair Value Measurements | Geothermal Investments |  |
Long-term Investments: |  |
Debt securities: | 2,000 | 2,000
Corporate and municipal debt securities |  |
Short-term investments: |  |
Total short-term investments | 21,128 | 33,813
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 | 21,128 | 33,813
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 |  | 53,490
U.S. government and federal agency securities | Level 1 |  |
Short-term investments: |  |
Total short-term investments |  | 53,490
U.S. government and federal agency securities | Level 2 |  |
Short-term investments: |  |
Total short-term investments |  | 0
U.S. government and federal agency securities | Level 3 |  |
Short-term investments: |  |
Total short-term investments |  | 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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