Pension And Other Postretirement Benefit Plans (Tables)

6 Months Ended

Sep. 30, 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 September 30,				Three Months Ended September 30,
(in thousands of dollars)	2023		2022		2023		2022
Service cost	$	1,286	$	1,503	$	24	$	32
Interest cost	2,898		2,351		266		235
Expected return on plan assets	(3,888)		(3,324)		(16)		(19)
Net amortization and deferral	203		1,001		(191)		(167)
Net periodic benefit cost	$	499	$	1,531	$	83	$	81

	Pension Benefits				Other Postretirement Benefits
	Six Months Ended September 30,				Six Months Ended September 30,
(in thousands of dollars)	2023		2022		2023		2022
Service cost	$	2,568	$	3,048	$	49	$	64
Interest cost	5,799		4,686		530		476
Expected return on plan assets	(7,776)		(6,648)		(32)		(38)
Net amortization and deferral	406		2,002		(380)		(339)
Net periodic benefit cost	$	997	$	3,088	$	167	$	163