Pension And Other Postretirement Benefit Plans (Tables)

6 Months Ended

Sep. 30, 2014

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)	2014			2013			2014			2013
Service cost	$	1,327		$	1,197		$	114		$	131
Interest cost	2,656			2,865			481			508
Expected return on plan assets	(3,535		)	(3,543		)	(26		)	(30		)
Curtailment gain	—			—			(1,503		)	—
Net amortization and deferral	780			2,447			(133		)	(17		)
Net periodic benefit cost	$	1,228		$	2,966		$	(1,067	)	$	592

	Pension Benefits						Other Postretirement Benefits
	Six Months Ended September 30,						Six Months Ended September 30,
(in thousands of dollars)	2014			2013			2014			2013
Service cost	$	2,661		$	2,392		$	228		$	269
Interest cost	5,325			5,722			965			1,040
Expected return on plan assets	(7,227		)	(7,085		)	(52		)	(60		)
Curtailment gain	—			—			(1,503		)	—
Net amortization and deferral	1,560			4,894			(266		)	(34		)
Net periodic benefit cost	$	2,319		$	5,923		$	(628	)	$	1,215