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FAIR VALUE MEASUREMENT OF FINANCIAL INSTRUMENTS - Schedule of Assets Measured at Fair Value (Details) - Recurring Fair Value Measurements - USD ($) $ in Thousands | Jun. 30, 2023 | Sep. 30, 2022
--- | --- | ---
Assets |  |
Short-term investments: | $ 72,609 | $ 117,101
Non-qualified supplemental savings plan | 15,183 | 14,301
Debt security investment in Galileo | 35,001 | 33,000
Other debt securities | 2,181 | 565
Total investments | 219,758 | 195,236
Liabilities |  |
Contingent consideration | 8,580 | 4,022
ADNOC Drilling |  |
Assets |  |
Equity investment | 154,770 | 147,370
Tamboran Resources Limited |  |
Assets |  |
Equity investment | 12,623 |
Level 1 |  |
Assets |  |
Short-term investments: | 20,888 | 18,837
Non-qualified supplemental savings plan | 15,183 | 14,301
Debt security investment in Galileo | 0 |
Other debt securities | 0 | 0
Total investments | 182,576 | 161,671
Liabilities |  |
Contingent consideration | 0 | 0
Level 1 | ADNOC Drilling |  |
Assets |  |
Equity investment | 154,770 | 147,370
Debt security investment in Galileo |  | 0
Level 1 | Tamboran Resources Limited |  |
Assets |  |
Equity investment | 12,623 |
Level 2 |  |
Assets |  |
Short-term investments: | 51,721 | 98,264
Non-qualified supplemental savings plan | 0 | 0
Debt security investment in Galileo | 0 | 0
Other debt securities | 0 | 0
Total investments | 0 | 0
Liabilities |  |
Contingent consideration | 0 | 0
Level 2 | ADNOC Drilling |  |
Assets |  |
Equity investment | 0 | 0
Level 2 | Tamboran Resources Limited |  |
Assets |  |
Equity investment | 0 |
Level 3 |  |
Assets |  |
Short-term investments: | 0 | 0
Non-qualified supplemental savings plan | 0 | 0
Equity investment |  | 0
Debt security investment in Galileo | 35,001 | 33,000
Other debt securities | 2,181 | 565
Total investments | 37,182 | 33,565
Liabilities |  |
Contingent consideration | 8,580 | 4,022
Level 3 | ADNOC Drilling |  |
Assets |  |
Equity investment | 0 |
Level 3 | Tamboran Resources Limited |  |
Assets |  |
Equity investment | 0 |
Corporate debt securities |  |
Assets |  |
Short-term investments: | 51,721 | 98,264
Corporate debt securities | Level 1 |  |
Assets |  |
Short-term investments: | 0 | 0
Corporate debt securities | Level 2 |  |
Assets |  |
Short-term investments: | 51,721 | 98,264
Corporate debt securities | Level 3 |  |
Assets |  |
Short-term investments: | 0 | 0
U.S. government and federal agency securities |  |
Assets |  |
Short-term investments: | 20,888 | 18,837
U.S. government and federal agency securities | Level 1 |  |
Assets |  |
Short-term investments: | 20,888 | 18,837
U.S. government and federal agency securities | Level 2 |  |
Assets |  |
Short-term investments: | 0 | 0
U.S. government and federal agency securities | Level 3 |  |
Assets |  |
Short-term investments: | $ 0 | $ 0

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