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Pension And Other Postretirement Benefit Plans (Tables)
 9 Months Ended
Dec. 31, 2019
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)
 
2019
 
2018
 
2019
 
2018
 
 
 
 
 
 
 
 
 
Service cost
 
$
1,529

  
$
1,433

 
$
53

  
$
60

Interest cost
 
2,678

  
2,503

 
322

  
342

Expected return on plan assets
 
(4,151
)
  
(3,693
)
 
(24
)
  
(24
)
Net amortization and deferral
 
696

  
902

 
(154
)
  
(193
)
Net periodic benefit cost
 
$
752

 
$
1,145

 
$
197

 
$
185

 
 
 
 
 
 
 
 
 
 
 
Pension Benefits
 
Other Postretirement Benefits
 
 
Nine Months Ended December 31,
 
Nine Months Ended December 31,
(in thousands of dollars)
 
2019
 
2018
 
2019
 
2018
 
 
 
 
 
 
 
 
 
Service cost
 
$
4,595

  
$
4,340

 
$
159

  
$
177

Interest cost
 
8,125

  
7,469

 
986

  
1,012

Expected return on plan assets
 
(12,557
)
  
(11,081
)
 
(80
)
  
(74
)
Net amortization and deferral
 
2,092

  
2,706

 
(459
)
  
(581
)
Net periodic benefit cost
 
$
2,255

 
$
3,434

 
$
606

 
$
534