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EMPLOYEE BENEFIT PLANS (Tables)

9 Months Ended

Jun. 30, 2025

Retirement Benefits [Abstract]

Schedule of Components of Net Periodic Cost

The components of the net periodic cost for pension benefits, including the Company's Pension Equalization Plan, and OPEB costs (principally health care and life insurance) for employees and covered dependents were as follows:

			Pension												OPEB
			Three Months Ended						Nine Months Ended						Three Months Ended						Nine Months Ended
			June 30,						June 30,						June 30,						June 30,
(Thousands)			2025			2024			2025			2024			2025			2024			2025			2024
Service cost			$	1,381		$	1,244		$	4,142		$	3,732		$	273		$	254		$	819		$	1,151
Interest cost			3,858			4,060			11,575			12,180			2,096			1,809			6,290			6,519
Expected return on plan assets			(5,925)			(5,087)			(17,775)			(15,260)			(2,346)			(2,021)			(7,039)			(5,899)
Recognized actuarial loss			301			29			902			88			1,792			1,256			5,378			3,007
Prior service cost (credit) amortization			—			16			—			47			(3,270)			(3,339)			(9,810)			(6,676)
Net periodic benefit (credit) cost			$	(385)		$	262		$	(1,156)		$	787		$	(1,455)		$	(2,041)		$	(4,362)		$	(1,898)

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- References

No definition available.

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- Definition

Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Subparagraph (q)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480506/715-20-50-5

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 715
-SubTopic 20
-Subparagraph (h)
-Name Accounting Standards Codification
-Paragraph 1
-Section 50
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480506/715-20-50-1

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