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Pension And Other Postretirement Benefit Plans (Tables)
 6 Months Ended
Sep. 30, 2025
Retirement Benefits [Abstract]  
Components of Company's Net Periodic Benefit Cost
The components of the Company’s net periodic benefit cost were as follows:
Pension BenefitsOther Postretirement Benefits
Three Months Ended September 30,Three Months Ended September 30,
(in thousands of dollars)2025202420252024
Service cost$1,259 $1,319 $17 $23 
Interest cost2,268 2,882 266 264 
Expected return on plan assets(3,027)(3,607)(11)(14)
Net amortization and deferral83 174 (161)(160)
Net periodic benefit cost
$583 $768 $111 $113 
Pension BenefitsOther Postretirement Benefits
Six Months Ended September 30,Six Months Ended September 30,
(in thousands of dollars)2025202420252024
Service cost$2,511 $2,641 $34 $47 
Interest cost4,535 5,754 528 535 
Expected return on plan assets(6,054)(7,214)(22)(28)
Net amortization and deferral166 348 (321)(320)
Net periodic benefit cost
$1,158 $1,529 $219 $234