Retirement Plan And Other Post-Retirement Benefits (Tables)

6 Months Ended

Mar. 31, 2024

Retirement Benefits [Abstract]

Components of Net Periodic Benefit Cost (Income)

Components of Net Periodic Benefit Cost (in thousands):

	Retirement Plan				Other Post-Retirement Benefits
Three Months Ended March 31,	2024		2023		2024		2023
Service Cost	$	1,049	$	1,297	$	109	$	147
Interest Cost	10,890		10,629		3,890		3,912
Expected Return on Plan Assets	(17,086)		(16,648)		(6,660)		(6,403)
Amortization of Prior Service Cost (Credit)	91		109		(107)		(107)
Amortization of (Gains) Losses	(335)		(1,920)		(567)		(2,189)
Net Amortization and Deferral for Regulatory Purposes (Including Volumetric Adjustments) (1)	4,057		5,378		1,769		3,493
Net Periodic Benefit Cost (Income)	$	(1,334)	$	(1,155)	$	(1,566)	$	(1,147)

	Retirement Plan				Other Post-Retirement Benefits
Six Months Ended March 31,	2024		2023		2024		2023
Service Cost	$	2,098	$	2,594	$	217	$	293
Interest Cost	21,779		21,258		7,780		7,824
Expected Return on Plan Assets	(34,172)		(33,297)		(13,321)		(12,806)
Amortization of Prior Service Cost (Credit)	181		218		(214)		(214)
Amortization of (Gains) Losses	(669)		(3,840)		(1,133)		(4,378)
Net Amortization and Deferral for Regulatory Purposes (Including Volumetric Adjustments) (1)	8,116		10,756		4,008		7,314
Net Periodic Benefit Cost (Income)	$	(2,667)	$	(2,311)	$	(2,663)	$	(1,967)

(1)The Company’s policy is to record retirement plan and other post-retirement benefit costs in the Utility segment on a volumetric basis to reflect the fact that the Utility segment experiences higher throughput of natural gas in the winter months and lower throughput of natural gas in the summer months.