Pension And Other Postretirement Benefit Plans (Tables)

9 Months Ended

Dec. 31, 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 December 31,				Three Months Ended December 31,
(in thousands of dollars)	2021		2020		2021		2020
Service cost	$	1,678	$	1,603	$	43	$	48
Interest cost	2,212		2,403		265		286
Expected return on plan assets	(3,373)		(3,676)		(21)		(24)
Net amortization and deferral	976		1,120		(115)		(139)
Net periodic benefit cost	$	1,493	$	1,450	$	172	$	171

	Pension Benefits				Other Postretirement Benefits
	Nine Months Ended December 31,				Nine Months Ended December 31,
(in thousands of dollars)	2021		2020		2021		2020
Service cost	$	4,981	$	4,691	$	137	$	145
Interest cost	6,725		7,316		745		859
Expected return on plan assets	(10,145)		(11,032)		(65)		(72)
Net amortization and deferral	2,928		3,361		(346)		(424)
Net periodic benefit cost	$	4,489	$	4,336	$	471	$	508