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FAIR VALUE MEASUREMENT OF FINANCIAL INSTRUMENTS (Tables) | 12 Months Ended
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Sep. 30, 2021
Fair Value Disclosures [Abstract] |
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis | The following table summarizes our assets and liabilities measured at fair value presented in our Consolidated Balance Sheets:
| September 30, 2021
(in thousands) | Fair Value |  | Level 1 |  | Level 2 |  | Level 3
Recurring fair value measurements: |  |  |  |  |  |  |
Cash and cash equivalents | $ | 917,534 |  |  | $ | 917,534 |  |  | $ | — |  |  | $ | — |
Short-term investments: |  |  |  |  |  |  |
Corporate debt securities | 192,950 |  |  | — |  |  | 192,950 |  |  | — |
U.S. government and federal agency securities | 5,750 |  |  | 5,750 |  |  | — |  |  | — |
Total short-term investments | 198,700 |  |  | 5,750 |  |  | 192,950 |  |  | — |
Other current assets | 18,350 |  |  | 18,350 |  |  | — |  |  | — |
Investments: |  |  |  |  |  |  |
Non-qualified supplemental savings plan | 18,221 |  |  | 18,221 |  |  | — |  |  | — |
Debt and equity securities | 17,223 |  |  | 13,858 |  |  | — |  |  | 3,365 |
Cornerstone investment in ADNOC Drilling | 100,000 |  |  | 100,000 |  |  | — |  |  | — |
Total investments | 135,444 |  |  | 132,079 |  |  | — |  |  | 3,365 |
Other assets | 832 |  |  | 832 |  |  | — |  |  | — |
Total assets measured at fair value | $ | 1,270,860 |  |  | $ | 1,074,545 |  |  | $ | 192,950 |  |  | $ | 3,365 |
Liabilities: |  |  |  |  |  |  |
Contingent consideration | $ | 2,996 |  |  | $ | — |  |  | $ | — |  |  | $ | 2,996 |
| September 30, 2020
(in thousands) | Fair Value |  | Level 1 |  | Level 2 |  | Level 3
Recurring fair value measurements: |  |  |  |  |  |  |
Cash and cash equivalents | $ | 487,884 |  |  | $ | 487,884 |  |  | $ | — |  |  | $ | — |
Short-term investments: |  |  |  |  |  |  |
Certificates of deposit | 1,370 |  |  | — |  |  | 1,370 |  |  | — |
Corporate debt securities | 78,156 |  |  | — |  |  | 78,156 |  |  | — |
U.S. government and federal agency securities | 7,817 |  |  | 7,817 |  |  | — |  |  | — |
Other | 1,992 |  |  | 1,992 |  |  | — |  |  | — |
Total short-term investments | 89,335 |  |  | 9,809 |  |  | 79,526 |  |  | — |
Other current assets | 45,577 |  |  | 45,577 |  |  | — |  |  | — |
Investments: |  |  |  |  |  |  |
Non-qualified supplemental savings plan | 19,819 |  |  | 19,819 |  |  | — |  |  | — |
Debt and equity securities | 11,766 |  |  | 7,274 |  |  | 3,992 |  |  | 500 |
Total investments | 31,585 |  |  | 27,093 |  |  | 3,992 |  |  | 500 |
Other assets | 3,286 |  |  | 3,286 |  |  | — |  |  | — |
Total assets measured at fair value | $ | 657,667 |  |  | $ | 573,649 |  |  | $ | 83,518 |  |  | $ | 500 |
Liabilities: |  |  |  |  |  |  |
Contingent consideration | $ | 9,123 |  |  | $ | — |  |  | $ | — |  |  | $ | 9,123 |
Schedule of Reconciliation of Changes in Fair Value of Financial Assets and Liabilities Classified as Level 3 | The following table presents a reconciliation of changes in the fair value of our financial liabilities classified as Level 3 fair value measurements in the fair value hierarchy for fiscal years 2021 and 2020:
(in thousands) | 2021 |  | 2020
Net liabilities at beginning of period | $ | 9,123 |  |  | $ | 18,373 |
Additions | — |  |  | 1,500 |
Total gains or losses: |  |  |
Included in earnings | 1,123 |  |  | (2,500) |
Settlements 1 | (7,250) |  |  | (8,250) |
Net liabilities at end of period | $ | 2,996 |  |  | $ | 9,123 |
(1)Settlements represent earnout payments that have been earned or paid during the period.
Schedule of Supplemental Fair Value Information about Long-Term Fixed-Rate Debt | The following information presents the supplemental fair value information about current and long-term fixed-rate debt at September 30, 2021 and 2020:
| September 30,
(in millions) | 2021 |  | 2020 1
Current portion of long-term debt |  |  |
Carrying value | $ | 483.5 |  |  | $ | — |
Fair value | $ | 541.6 |  |  | $ | — |
Long-term debt, net |  |  |
Carrying value | $ | 542.0 |  |  | $ | 480.7 |
Fair value | $ | 554.3 |  |  | $ | 534.5 |
(1)As of September 30, 2021 we reclassified the outstanding 2025 Notes to Current Portion of Long-Term Debt on our Consolidated Balance Sheets. On October 27, 2021, we redeemed these notes. See Note 7—Debt to our Consolidated Financial Statements.

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- Definition Tabular disclosure of the fair value of financial instruments, including financial assets and financial liabilities, and the measurements of those instruments, assets, and liabilities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=123594938&loc=d3e13467-108611 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 + Details
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- Definition Tabular disclosure of the fair value measurement of liabilities using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets), and gains or losses recognized in other comprehensive income (loss) and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs) by class of liability. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19279-110258 + Details
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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 + Details
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