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FAIR VALUE MEASUREMENT OF FINANCIAL INSTRUMENTS - Schedule of Assets Measured at Fair Value (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Sep. 30, 2022
--- | --- | ---
Short-term investments: |  |
Total short-term investments | $ 93,600 | $ 117,101
Nonrecurring fair value measurements |  |
Total | 239,145 | 205,943
Liabilities |  |
Contingent consideration | 0 | 1,272
Geothermal Investments |  |
Liabilities |  |
Equity securities measured at cost | 25,200 |
Recurring Fair Value Measurements |  |
Long-term investments: |  |
Non-qualified supplemental savings plan | 14,597 | 14,301
Nonrecurring fair value measurements |  |
Total | 236,715 | 195,236
Liabilities |  |
Contingent consideration | 9,455 | 4,022
Recurring Fair Value Measurements | ADNOC Drilling |  |
Long-term investments: |  |
Equity securities, investment | 174,758 | 147,370
Recurring Fair Value Measurements | Galileo Technologies |  |
Long-term investments: |  |
Debt securities, investment | 35,434 | 33,000
Recurring Fair Value Measurements | Tamboran Resources Limited |  |
Long-term investments: |  |
Equity securities, investment | 9,920 |
Recurring Fair Value Measurements | Geothermal Investments |  |
Long-term investments: |  |
Debt securities, investment | 2,006 |
Recurring Fair Value Measurements | Other |  |
Long-term investments: |  |
Debt securities, investment |  | 565
Nonrecurring Fair Value Measurements |  |
Nonrecurring fair value measurements |  |
Other equity securities | 2,430 |
Total | 2,430 | 10,707
Liabilities |  |
Equity securities measured at cost |  | 600
Nonrecurring Fair Value Measurements | Geothermal Investments |  |
Long-term investments: |  |
Equity securities, investment |  | 23,100
Nonrecurring fair value measurements |  |
Geothermal equity securities |  | 10,707
Liabilities |  |
Equity securities measured at cost |  | 12,400
Nonrecurring Fair Value Measurements | Other |  |
Long-term investments: |  |
Equity securities, investment | 3,000 |
Liabilities |  |
Equity securities measured at cost | 600 |
Level 1 |  |
Short-term investments: |  |
Total short-term investments | 44,836 | 18,837
Nonrecurring fair value measurements |  |
Total | 199,275 | 161,671
Level 1 | Recurring Fair Value Measurements |  |
Long-term investments: |  |
Non-qualified supplemental savings plan | 14,597 | 14,301
Nonrecurring fair value measurements |  |
Total | 199,275 | 161,671
Liabilities |  |
Contingent consideration | 0 | 0
Level 1 | Recurring Fair Value Measurements | ADNOC Drilling |  |
Long-term investments: |  |
Equity securities, investment | 174,758 | 147,370
Level 1 | Recurring Fair Value Measurements | Galileo Technologies |  |
Long-term investments: |  |
Debt securities, investment | 0 | 0
Level 1 | Recurring Fair Value Measurements | Tamboran Resources Limited |  |
Long-term investments: |  |
Equity securities, investment | 9,920 |
Level 1 | Recurring Fair Value Measurements | Geothermal Investments |  |
Long-term investments: |  |
Debt securities, investment | 0 |
Level 1 | Recurring Fair Value Measurements | Other |  |
Long-term investments: |  |
Debt securities, investment |  | 0
Level 1 | Nonrecurring Fair Value Measurements |  |
Nonrecurring fair value measurements |  |
Other equity securities | 0 |
Total | 0 | 0
Level 1 | Nonrecurring Fair Value Measurements | Geothermal Investments |  |
Nonrecurring fair value measurements |  |
Geothermal equity securities |  | 0
Level 2 |  |
Short-term investments: |  |
Total short-term investments | 48,764 | 98,264
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 | Galileo Technologies |  |
Long-term investments: |  |
Debt securities, investment | 0 | 0
Level 2 | Recurring Fair Value Measurements | Tamboran Resources Limited |  |
Long-term investments: |  |
Equity securities, investment | 0 |
Level 2 | Recurring Fair Value Measurements | Geothermal Investments |  |
Long-term investments: |  |
Debt securities, investment | 0 |
Level 2 | Recurring Fair Value Measurements | Other |  |
Long-term investments: |  |
Debt securities, investment |  | 0
Level 2 | Nonrecurring Fair Value Measurements |  |
Nonrecurring fair value measurements |  |
Other equity securities | 0 |
Total | 0 | 0
Level 2 | Nonrecurring Fair Value Measurements | Geothermal Investments |  |
Nonrecurring fair value measurements |  |
Geothermal equity securities |  | 0
Level 3 |  |
Short-term investments: |  |
Total short-term investments | 0 | 0
Nonrecurring fair value measurements |  |
Total | 39,870 | 44,272
Level 3 | Recurring Fair Value Measurements |  |
Long-term investments: |  |
Non-qualified supplemental savings plan | 0 | 0
Nonrecurring fair value measurements |  |
Total | 37,440 | 33,565
Liabilities |  |
Contingent consideration | 9,455 | 4,022
Level 3 | Recurring Fair Value Measurements | ADNOC Drilling |  |
Long-term investments: |  |
Equity securities, investment | 0 | 0
Level 3 | Recurring Fair Value Measurements | Galileo Technologies |  |
Long-term investments: |  |
Debt securities, investment | 35,434 | 33,000
Level 3 | Recurring Fair Value Measurements | Tamboran Resources Limited |  |
Long-term investments: |  |
Equity securities, investment | 0 |
Level 3 | Recurring Fair Value Measurements | Geothermal Investments |  |
Long-term investments: |  |
Debt securities, investment | 2,006 |
Level 3 | Recurring Fair Value Measurements | Other |  |
Long-term investments: |  |
Debt securities, investment |  | 565
Level 3 | Nonrecurring Fair Value Measurements |  |
Nonrecurring fair value measurements |  |
Geothermal equity securities | 2,400 |
Other equity securities | 2,430 |
Total | 2,430 | 10,707
Level 3 | Nonrecurring Fair Value Measurements | Geothermal Investments |  |
Nonrecurring fair value measurements |  |
Geothermal equity securities |  | 10,707
Corporate debt securities |  |
Short-term investments: |  |
Total short-term investments | 48,764 | 98,264
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 | 48,764 | 98,264
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 | 44,836 | 18,837
U.S. government and federal agency securities | Level 1 |  |
Short-term investments: |  |
Total short-term investments | 44,836 | 18,837
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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