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Pension And Other Postretirement Benefit Plans (Tables)
 9 Months Ended
Dec. 31, 2015
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)
 
2015
 
2014
 
2015
 
2014
 
 
 
 
 
 
 
 
 
Service cost
 
$
1,469

  
$
1,296

 
$
106

  
$
108

Interest cost
 
2,345

  
2,629

 
387

  
458

Expected return on plan assets
 
(3,574
)
  
(3,677
)
 
(15
)
  
(26
)
Net amortization and deferral
 
1,201

  
783

 
(44
)
  
(133
)
Net periodic benefit cost
 
$
1,441

 
$
1,031

 
$
434

 
$
407

 
 
Pension Benefits
 
Other Postretirement Benefits
 
 
Nine Months Ended December 31,
 
Nine Months Ended December 31,
(in thousands of dollars)
 
2015
 
2014
 
2015
 
2014
 
 
 
 
 
 
 
 
 
Service cost
 
$
4,431

  
$
3,957

 
$
320

  
$
336

Interest cost
 
7,038

  
7,954

 
1,186

  
1,423

Expected return on plan assets
 
(10,727
)
  
(10,904
)
 
(45
)
  
(78
)
Curtailment gain
 
—

 
—

 
—

 
(1,503
)
Net amortization and deferral
 
3,599

  
2,343

 
(132
)
  
(399
)
Net periodic benefit cost
 
$
4,341

 
$
3,350

 
$
1,329

 
$
(221
)