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FAIR VALUE MEASUREMENT OF FINANCIAL INSTRUMENTS - Summary of Assets Measured at Fair Value (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Sep. 30, 2020
--- | --- | ---
Liabilities: |  |
Contingent consideration | $ 1,759 | $ 4,197
Recurring Fair Value Measurements |  |
Assets: |  |
Cash and cash equivalents | 917,534 | 487,884
Short-term investments | 198,700 | 89,335
Other current assets | 18,350 | 45,577
Non-qualified supplemental savings plan | 18,221 | 19,819
Debt and equity securities | 17,223 | 11,766
Cornerstone investment in ADNOC Drilling | 100,000 |
Total investments | 135,444 | 31,585
Other assets | 832 | 3,286
Total assets measured at fair value | 1,270,860 | 657,667
Liabilities: |  |
Contingent consideration | 2,996 | 9,123
Level 1 | Recurring Fair Value Measurements |  |
Assets: |  |
Cash and cash equivalents | 917,534 | 487,884
Short-term investments | 5,750 | 9,809
Other current assets | 18,350 | 45,577
Non-qualified supplemental savings plan | 18,221 | 19,819
Debt and equity securities | 13,858 | 7,274
Cornerstone investment in ADNOC Drilling | 100,000 |
Total investments | 132,079 | 27,093
Other assets | 832 | 3,286
Total assets measured at fair value | 1,074,545 | 573,649
Liabilities: |  |
Contingent consideration | 0 | 0
Level 2 | Recurring Fair Value Measurements |  |
Assets: |  |
Cash and cash equivalents | 0 | 0
Short-term investments | 192,950 | 79,526
Other current assets | 0 | 0
Non-qualified supplemental savings plan | 0 | 0
Debt and equity securities | 0 | 3,992
Cornerstone investment in ADNOC Drilling | 0 |
Total investments | 0 | 3,992
Other assets | 0 | 0
Total assets measured at fair value | 192,950 | 83,518
Liabilities: |  |
Contingent consideration | 0 | 0
Level 3 | Recurring Fair Value Measurements |  |
Assets: |  |
Cash and cash equivalents | 0 | 0
Short-term investments | 0 | 0
Other current assets | 0 | 0
Non-qualified supplemental savings plan | 0 | 0
Debt and equity securities | 3,365 | 500
Cornerstone investment in ADNOC Drilling | 0 |
Total investments | 3,365 | 500
Other assets | 0 | 0
Total assets measured at fair value | 3,365 | 500
Liabilities: |  |
Contingent consideration | 2,996 | 9,123
Certificates of deposit | Recurring Fair Value Measurements |  |
Assets: |  |
Short-term investments |  | 1,370
Certificates of deposit | Level 1 | Recurring Fair Value Measurements |  |
Assets: |  |
Short-term investments |  | 0
Certificates of deposit | Level 2 | Recurring Fair Value Measurements |  |
Assets: |  |
Short-term investments |  | 1,370
Certificates of deposit | Level 3 | Recurring Fair Value Measurements |  |
Assets: |  |
Short-term investments |  | 0
Corporate debt securities | Recurring Fair Value Measurements |  |
Assets: |  |
Short-term investments | 192,950 | 78,156
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 | 192,950 | 78,156
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 | 5,750 | 7,817
U.S. government and federal agency securities | Level 1 | Recurring Fair Value Measurements |  |
Assets: |  |
Short-term investments | 5,750 | 7,817
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
Other | Recurring Fair Value Measurements |  |
Assets: |  |
Short-term investments |  | 1,992
Other | Level 1 | Recurring Fair Value Measurements |  |
Assets: |  |
Short-term investments |  | 1,992
Other | Level 2 | Recurring Fair Value Measurements |  |
Assets: |  |
Short-term investments |  | 0
Other | Level 3 | Recurring Fair Value Measurements |  |
Assets: |  |
Short-term investments |  | $ 0

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- Definition Represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with fair value disclosures required in footnote disclosures to financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This element represents the fair value of assets categorized as other current assets which are not in and of themselves material enough to require separate disclosure. + References No definition available. + Details
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