Pension And Other Postretirement Benefit Plans (Tables)

9 Months Ended

Dec. 31, 2023

Retirement Benefits [Abstract]

Components of Company's Net Periodic Benefit Cost

The components of the Company’s net periodic benefit cost were as follows:

	Pension Benefits				Other Postretirement Benefits
	Three Months Ended December 31,				Three Months Ended December 31,
(in thousands of dollars)	2023		2022		2023		2022
Service cost	$	1,280	$	1,549	$	24	$	33
Interest cost	2,897		2,341		263		236
Expected return on plan assets	(3,887)		(3,323)		(15)		(18)
Net amortization and deferral	205		1,001		(189)		(168)
Net periodic benefit cost	$	495	$	1,568	$	83	$	83

	Pension Benefits				Other Postretirement Benefits
	Nine Months Ended December 31,				Nine Months Ended December 31,
(in thousands of dollars)	2023		2022		2023		2022
Service cost	$	3,848	$	4,597	$	73	$	97
Interest cost	8,696		7,027		793		712
Expected return on plan assets	(11,663)		(9,971)		(47)		(56)
Net amortization and deferral	611		3,003		(569)		(507)
Net periodic benefit cost	$	1,492	$	4,656	$	250	$	246