Pension And Other Postretirement Benefit Plans (Tables)

6 Months Ended

Sep. 30, 2016

Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [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)	2016			2015			2016			2015
Service cost	$	1,359		$	1,479		$	74		$	106
Interest cost	2,467			2,347			383			392
Expected return on plan assets	(3,589		)	(3,577		)	(11		)	(15		)
Net amortization and deferral	838			1,199			(100		)	(44		)
Net periodic benefit cost	$	1,075		$	1,448		$	346		$	439

	Pension Benefits						Other Postretirement Benefits
	Six Months Ended September 30,						Six Months Ended September 30,
(in thousands of dollars)	2016			2015			2016			2015
Service cost	$	2,720		$	2,962		$	147		$	214
Interest cost	4,936			4,693			758			799
Expected return on plan assets	(7,178		)	(7,153		)	(22		)	(30		)
Net amortization and deferral	1,676			2,398			(200		)	(88		)
Net periodic benefit cost	$	2,154		$	2,900		$	683		$	895