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Pension And Other Postretirement Benefit Plans (Tables)
 6 Months Ended
Sep. 30, 2024
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)2024202320242023
Service cost$1,319 $1,286 $23 $24 
Interest cost2,882 2,898 264 266 
Expected return on plan assets(3,607)(3,888)(14)(16)
Net amortization and deferral174 203 (160)(191)
Net periodic benefit cost
$768 $499 $113 $83 
Pension BenefitsOther Postretirement Benefits
Six Months Ended September 30,Six Months Ended September 30,
(in thousands of dollars)2024202320242023
Service cost$2,641 $2,568 $47 $49 
Interest cost5,754 5,799 535 530 
Expected return on plan assets(7,214)(7,776)(28)(32)
Net amortization and deferral348 406 (320)(380)
Net periodic benefit cost
$1,529 $997 $234 $167