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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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