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Pension And Other Postretirement Benefit Plans (Tables)
 6 Months Ended
Sep. 30, 2012
Pension And Other Postretirement Benefit Plans [Abstract]  
Components of Company's Net Periodic Benefit Cost
 
 
Pension Benefits
 
Other Postretirement Benefits
 
 
Three Months Ended September 30,
 
Three Months Ended September 30,
(in thousands of dollars)
 
2012
 
2011
 
2012
 
2011
 
 
 
 
 
 
 
 
 
Service cost
 
$
1,046

  
$
1,274

 
$
146

  
$
189

Interest cost
 
3,153

  
3,386

 
569

  
578

Expected return on plan assets
 
(3,197
)
  
(3,646
)
 
(31
)
  
(34
)
Settlement costs
 
1,329

 
—

 
—

 
—

Net amortization and deferral
 
2,846

  
1,335

 
48

  
(59
)
Net periodic benefit cost
 
$
5,177

 
$
2,349

 
$
732

 
$
674


    
 
 
Pension Benefits
 
Other Postretirement Benefits
 
 
Six Months Ended September 30,
 
Six Months Ended September 30,
(in thousands of dollars)
 
2012
 
2011
 
2012
 
2011
 
 
 
 
 
 
 
 
 
Service cost
 
$
2,270

  
$
2,564

 
$
294

  
$
378

Interest cost
 
6,319

  
6,837

 
1,145

  
1,156

Expected return on plan assets
 
(6,694
)
  
(7,355
)
 
(62
)
  
(68
)
Settlement costs
 
1,329

 
—

 
—

 
—

Net amortization and deferral
 
5,364

  
2,677

 
100

  
(117
)
Net periodic benefit cost
 
$
8,588

 
$
4,723

 
$
1,477

 
$
1,349