Pension And Other Postretirement Benefit Plans (Tables)

6 Months Ended

Sep. 30, 2021

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)	2021		2020		2021		2020
Service cost	$	1,653	$	1,547	$	47	$	49
Interest cost	2,254		2,459		241		286
Expected return on plan assets	(3,387)		(3,679)		(22)		(24)
Net amortization and deferral	976		1,120		(116)		(142)
Net periodic benefit cost	$	1,496	$	1,447	$	150	$	169

	Pension Benefits				Other Postretirement Benefits
	Six Months Ended September 30,				Six Months Ended September 30,
(in thousands of dollars)	2021		2020		2021		2020
Service cost	$	3,303	$	3,088	$	94	$	97
Interest cost	4,513		4,913		480		573
Expected return on plan assets	(6,772)		(7,356)		(44)		(48)
Net amortization and deferral	1,952		2,241		(231)		(285)
Net periodic benefit cost	$	2,996	$	2,886	$	299	$	337