Pension And Other Postretirement Benefit Plans (Tables)

9 Months Ended

Dec. 31, 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 December 31,						Three Months Ended December 31,
(in thousands of dollars)	2014			2013			2014			2013
Service cost	$	1,296		$	1,115		$	108		$	137
Interest cost	2,629			2,883			458			521
Expected return on plan assets	(3,677		)	(3,517		)	(26		)	(29		)
Net amortization and deferral	783			1,022			(133		)	(16		)
Net periodic benefit cost	$	1,031		$	1,503		$	407		$	613

	Pension Benefits						Other Postretirement Benefits
	Nine Months Ended December 31,						Nine Months Ended December 31,
(in thousands of dollars)	2014			2013			2014			2013
Service cost	$	3,957		$	3,507		$	336		$	406
Interest cost	7,954			8,605			1,423			1,561
Expected return on plan assets	(10,904		)	(10,602		)	(78		)	(89		)
Curtailment gain	—			—			(1,503		)	—
Net amortization and deferral	2,343			5,916			(399		)	(50		)
Net periodic benefit cost	$	3,350		$	7,426		$	(221	)	$	1,828