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FAIR VALUE MEASUREMENT OF FINANCIAL INSTRUMENTS - Assets and Liabilities Measured at Fair Value (Details) - Recurring Fair Value Measurements - USD ($) $ in Thousands | Jun. 30, 2022 | Sep. 30, 2021
--- | --- | ---
ASSETS |  |
Total short-term investments | $ 144,331 | $ 198,700
Non-qualified supplemental savings plan | 15,594 | 18,221
Debt securities | 3,524 | 14,358
Equity investment in ADNOC Drilling | 147,786 | 100,000
Debt security investment in Galileo | 33,000 |
Total investments | 199,904 | 132,579
Liabilities |  |
Contingent consideration | 3,996 | 2,996
Corporate debt securities |  |
ASSETS |  |
Total short-term investments | 132,629 | 192,950
U.S. government and federal agency securities |  |
ASSETS |  |
Total short-term investments | 11,702 | 5,750
Level 1 |  |
ASSETS |  |
Total short-term investments | 11,702 | 5,750
Non-qualified supplemental savings plan | 15,594 | 18,221
Debt securities | 0 | 13,858
Equity investment in ADNOC Drilling | 147,786 | 100,000
Debt security investment in Galileo | 0 |
Total investments | 163,380 | 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 | 11,702 | 5,750
Level 2 |  |
ASSETS |  |
Total short-term investments | 132,629 | 192,950
Non-qualified supplemental savings plan | 0 | 0
Debt securities | 0 | 0
Equity investment in ADNOC Drilling | 0 | 0
Debt security investment in Galileo | 0 |
Total investments | 0 | 0
Liabilities |  |
Contingent consideration | 0 | 0
Level 2 | Corporate debt securities |  |
ASSETS |  |
Total short-term investments | 132,629 | 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
Debt securities | 3,524 | 500
Equity investment in ADNOC Drilling | 0 | 0
Debt security investment in Galileo | 33,000 |
Total investments | 36,524 | 500
Liabilities |  |
Contingent consideration | 3,996 | 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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