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Pension And Other Postretirement Benefit Plans (Tables)
 9 Months Ended
Dec. 31, 2018
Defined Benefit Plan [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)
 
2018
 
2017
 
2018
 
2017
 
 
 
 
 
 
 
 
 
Service cost
 
$
1,433

  
$
1,314

 
$
60

  
$
64

Interest cost
 
2,503

  
2,436

 
342

  
381

Expected return on plan assets
 
(3,693
)
  
(3,717
)
 
(24
)
  
(22
)
Net amortization and deferral
 
902

  
815

 
(193
)
  
(71
)
Net periodic benefit cost
 
$
1,145

 
$
848

 
$
185

 
$
352

 
 
 
 
 
 
 
 
 
 
 
Pension Benefits
 
Other Postretirement Benefits
 
 
Nine Months Ended December 31,
 
Nine Months Ended December 31,
(in thousands of dollars)
 
2018
 
2017
 
2018
 
2017
 
 
 
 
 
 
 
 
 
Service cost
 
$
4,340

  
$
3,943

 
$
177

  
$
193

Interest cost
 
7,469

  
7,309

 
1,012

  
1,150

Expected return on plan assets
 
(11,081
)
  
(11,151
)
 
(74
)
  
(66
)
Net amortization and deferral
 
2,706

  
2,445

 
(581
)
  
(213
)
Net periodic benefit cost
 
$
3,434

 
$
2,546

 
$
534

 
$
1,064