Pension And Other Postretirement Benefit Plans (Tables)

6 Months Ended

Sep. 30, 2013

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)	2013			2012			2013			2012
Service cost	$	1,197		$	1,046		$	131		$	146
Interest cost	2,865			3,153			508			569
Expected return on plan assets	(3,543		)	(3,197		)	(30		)	(31		)
Settlement costs	—			1,329			—			—
Net amortization and deferral	2,447			2,846			(17		)	48
Net periodic benefit cost	$	2,966		$	5,177		$	592		$	732

	Pension Benefits						Other Postretirement Benefits
	Six Months Ended September 30,						Six Months Ended September 30,
(in thousands of dollars)	2013			2012			2013			2012
Service cost	$	2,392		$	2,270		$	269		$	294
Interest cost	5,722			6,319			1,040			1,145
Expected return on plan assets	(7,085		)	(6,694		)	(60		)	(62		)
Settlement costs	—			1,329			—			—
Net amortization and deferral	4,894			5,364			(34		)	100
Net periodic benefit cost	$	5,923		$	8,588		$	1,215		$	1,477

Projected benefit obligation and funded status of the Company's defined benefit pension plans after remeasurement

	Pension Benefits
(in thousands of dollars)	September 30, 2013			March 31, 2013
Projected benefit obligation	$	260,689		$	299,161
Funded status	(52,484		)	(93,219		)