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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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