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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