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FAIR VALUE MEASUREMENT OF FINANCIAL INSTRUMENTS (Tables)

3 Months Ended

Dec. 31, 2024

Fair Value Disclosures [Abstract]

Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis

The following tables summarize our financial assets and liabilities measured at fair value and indicate the level in the fair value hierarchy in which we classify the fair value measurement as of the dates indicated below:

			December 31, 2024
(in thousands)			Fair Value						Level 1						Level 2						Level 3
Assets
Short-term investments:
Money market mutual funds			$	72,305					$	72,305					$	—					$	—
Corporate and municipal debt securities			26,234						—						26,234						—
U.S. government and federal agency securities			36,778						36,778						—						—
Total			135,317						109,083						26,234						—
Long-term Investments:
Recurring fair value measurements:
Equity securities:
Non-qualified supplemental savings plan			16,275						16,275						—						—
Investment in Tamboran			19,810						19,810						—						—
Debt securities:
Investment in Galileo, net			27,499						—						—						27,499
Geothermal debt securities, net			2,000						—						—						2,000
Other debt securities			4,988						4,738						—						250
Total			70,572						40,823						—						29,749

			September 30, 2024
(in thousands)			Fair Value						Level 1						Level 2						Level 3
Assets
Short-term investments:
Corporate debt securities			$	33,813					$	—					$	33,813					$	—
U.S. government and federal agency securities			53,490						53,490						—						—
Investment in ADNOC Drilling			205,616						205,616						—						—
Total			292,919						259,106						33,813						—
Long-term investments:
Recurring fair value measurements:
Equity securities:
Non-qualified supplemental savings plan			15,633						15,633						—						—
Investment in Tamboran			20,958						20,958						—						—
Debt securities:
Investment in Galileo, net			27,044						—						—						27,044
Geothermal debt securities, net			2,000						—						—						2,000
Other debt securities			4,588						4,338						—						250
Total			70,223						40,929						—						29,294

Schedule of Reconciliation of Long Term Debt Securities Available For Sale, Classified as Level 3

The following table reconciles changes in the fair value of our Level 3 assets for the periods presented below:

			Three Months Ended December 31,
(in thousands)			2024						2023
Assets at beginning of period			$	29,294					$	37,440
Accrued interest			455						433
Total losses:
Included in earnings			—						(5)
Assets at end of period			$	29,749					$	37,868

The following table reconciles changes in the balance of our equity securities, without readily determinable fair values, including investments that have been marked to fair value on a nonrecurring basis, for the periods presented below:

			Three Months Ended December 31,
(in millions)			2024						2023
Assets at beginning of period			$	30,090					$	28,232
Purchases			646						291
Total gains:
Included in earnings			109						—
Assets at end of period			$	30,845					$	28,523

Schedule of Supplemental Fair Value Information about Long-Term Fixed-Rate Debt

The following information presents the supplemental fair value information for our long-term fixed-rate debt at December 31, 2024 and September 30, 2024:

			December 31,						September 30,
(in millions)			2024						2024
Long-term debt, net
Carrying value			1,781.7						1,782.2
Fair value			1,666.5						1,702.9

X

- Definition

Tabular disclosure of assets, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class 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/2009/role/commonPracticeRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

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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
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 11
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482907/825-10-50-11

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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/2009/role/commonPracticeRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

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