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FAIR VALUE MEASUREMENT OF FINANCIAL INSTRUMENTS - Summary of Assets and Liabilities Measured at Fair Value (Details) - Recurring Fair Value Measurements - USD ($) $ in Thousands | Dec. 31, 2021 | Sep. 30, 2021
--- | --- | ---
Assets: |  |
Total short-term investments | $ 207,068 | $ 198,700
Non-qualified supplemental savings plan | 19,455 | 18,221
Equity and debt securities | 17,502 | 14,358
Equity/Cornerstone investment in ADNOC Drilling | 147,786 | 100,000
Total investments | 184,743 | 132,579
Liabilities |  |
Contingent consideration | 3,096 | 2,996
Corporate debt securities |  |
Assets: |  |
Total short-term investments | 203,401 | 192,950
U.S. government and federal agency securities |  |
Assets: |  |
Total short-term investments | 3,667 | 5,750
Level 1 |  |
Assets: |  |
Total short-term investments | 3,667 | 5,750
Non-qualified supplemental savings plan | 19,455 | 18,221
Equity and debt securities | 14,002 | 13,858
Equity/Cornerstone investment in ADNOC Drilling | 147,786 | 100,000
Total investments | 181,243 | 132,079
Liabilities |  |
Contingent consideration | 0 | 0
Level 1 | Corporate debt securities |  |
Assets: |  |
Total short-term investments | 0 | 0
Level 1 | U.S. government and federal agency securities |  |
Assets: |  |
Total short-term investments | 3,667 | 5,750
Level 2 |  |
Assets: |  |
Total short-term investments | 203,401 | 192,950
Non-qualified supplemental savings plan | 0 | 0
Equity and debt securities | 0 | 0
Equity/Cornerstone investment in ADNOC Drilling | 0 | 0
Total investments | 0 | 0
Liabilities |  |
Contingent consideration | 0 | 0
Level 2 | Corporate debt securities |  |
Assets: |  |
Total short-term investments | 203,401 | 192,950
Level 2 | U.S. government and federal agency securities |  |
Assets: |  |
Total short-term investments | 0 | 0
Level 3 |  |
Assets: |  |
Total short-term investments | 0 | 0
Non-qualified supplemental savings plan | 0 | 0
Equity and debt securities | 3,500 | 500
Equity/Cornerstone investment in ADNOC Drilling | 0 | 0
Total investments | 3,500 | 500
Liabilities |  |
Contingent consideration | 3,096 | 2,996
Level 3 | Corporate debt securities |  |
Assets: |  |
Total short-term investments | 0 | 0
Level 3 | U.S. government and federal agency securities |  |
Assets: |  |
Total short-term investments | $ 0 | $ 0

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