Pension And Other Postretirement Benefit Plans (Tables)

6 Months Ended

Sep. 30, 2019

Defined Benefit Plan [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)	2019			2018			2019			2018
Service cost	$	1,477		$	1,452		$	53		$	58
Interest cost	2,710			2,485			331			330
Expected return on plan assets	(4,190		)	(3,694		)	(29		)	(25		)
Net amortization and deferral	698			902			(153		)	(194		)
Net periodic benefit cost	$	695		$	1,145		$	202		$	169

	Pension Benefits						Other Postretirement Benefits
	Six Months Ended September 30,						Six Months Ended September 30,
(in thousands of dollars)	2019			2018			2019			2018
Service cost	$	3,066		$	2,907		$	106		$	117
Interest cost	5,447			4,966			664			670
Expected return on plan assets	(8,406		)	(7,388		)	(56		)	(50		)
Net amortization and deferral	1,396			1,804			(305		)	(388		)
Net periodic benefit cost	$	1,503		$	2,289		$	409		$	349