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FAIR VALUE MEASUREMENT OF FINANCIAL INSTRUMENTS - Summary of Assets Measured at Fair Value (Details) - USD ($) $ in Thousands | Sep. 30, 2022 | Sep. 30, 2021
--- | --- | ---
Liabilities |  |
Contingent consideration | $ 1,272 | $ 1,759
Recurring Fair Value Measurements |  |
Assets |  |
Short-term investments: | 117,101 | 198,700
Non-qualified supplemental savings plan | 14,301 | 18,221
Equity investment in ADNOC Drilling | 147,370 | 100,000
Debt security investment in Galileo | 33,000 |
Other debt securities | 565 | 14,358
Total investments | 195,236 | 132,579
Liabilities |  |
Contingent consideration | 4,022 | 2,996
Level 1 | Recurring Fair Value Measurements |  |
Assets |  |
Short-term investments: | 18,837 | 5,750
Non-qualified supplemental savings plan | 14,301 | 18,221
Equity investment in ADNOC Drilling | 147,370 | 100,000
Debt security investment in Galileo | 0 |
Other debt securities | 0 | 13,858
Total investments | 161,671 | 132,079
Liabilities |  |
Contingent consideration | 0 | 0
Level 2 | Recurring Fair Value Measurements |  |
Assets |  |
Short-term investments: | 98,264 | 192,950
Non-qualified supplemental savings plan | 0 | 0
Equity investment in ADNOC Drilling | 0 | 0
Debt security investment in Galileo | 0 |
Other debt securities | 0 | 0
Total investments | 0 | 0
Liabilities |  |
Contingent consideration | 0 | 0
Level 3 | Recurring Fair Value Measurements |  |
Assets |  |
Short-term investments: | 0 | 0
Non-qualified supplemental savings plan | 0 | 0
Equity investment in ADNOC Drilling | 0 | 0
Debt security investment in Galileo | 33,000 |
Other debt securities | 565 | 500
Total investments | 33,565 | 500
Liabilities |  |
Contingent consideration | 4,022 | 2,996
Corporate debt securities | Recurring Fair Value Measurements |  |
Assets |  |
Short-term investments: | 98,264 | 192,950
Corporate debt securities | Level 1 | Recurring Fair Value Measurements |  |
Assets |  |
Short-term investments: | 0 | 0
Corporate debt securities | Level 2 | Recurring Fair Value Measurements |  |
Assets |  |
Short-term investments: | 98,264 | 192,950
Corporate debt securities | Level 3 | Recurring Fair Value Measurements |  |
Assets |  |
Short-term investments: | 0 | 0
U.S. government and federal agency securities | Recurring Fair Value Measurements |  |
Assets |  |
Short-term investments: | 18,837 | 5,750
U.S. government and federal agency securities | Level 1 | Recurring Fair Value Measurements |  |
Assets |  |
Short-term investments: | 18,837 | 5,750
U.S. government and federal agency securities | Level 2 | Recurring Fair Value Measurements |  |
Assets |  |
Short-term investments: | 0 | 0
U.S. government and federal agency securities | Level 3 | Recurring Fair Value Measurements |  |
Assets |  |
Short-term investments: | $ 0 | $ 0

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