Retirement Plan And Other Post-Retirement Benefits (Tables)

6 Months Ended

Mar. 31, 2023

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,	2023		2022		2023		2022
Service Cost	$	1,297	$	2,190	$	147	$	332
Interest Cost	10,629		5,707		3,912		2,267
Expected Return on Plan Assets	(16,648)		(13,074)		(6,403)		(7,340)
Amortization of Prior Service Cost (Credit)	109		134		(107)		(107)
Amortization of (Gains) Losses	(1,920)		6,601		(2,189)		(1,903)
Net Amortization and Deferral for Regulatory Purposes (Including Volumetric Adjustments) (1)	5,378		8,418		3,493		4,274
Net Periodic Benefit Cost (Income)	$	(1,155)	$	9,976	$	(1,147)	$	(2,477)

	Retirement Plan				Other Post-Retirement Benefits
Six Months Ended March 31,	2023		2022		2023		2022
Service Cost	$	2,594	$	4,379	$	293	$	664
Interest Cost	21,258		11,414		7,824		4,533
Expected Return on Plan Assets	(33,297)		(26,147)		(12,806)		(14,680)
Amortization of Prior Service Cost (Credit)	218		268		(214)		(214)
Amortization of (Gains) Losses	(3,840)		13,202		(4,378)		(3,805)
Net Amortization and Deferral for Regulatory Purposes (Including Volumetric Adjustments) (1)	10,756		12,838		7,314		10,519
Net Periodic Benefit Cost (Income)	$	(2,311)	$	15,954	$	(1,967)	$	(2,983)

(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.