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Pension And Other Postretirement Benefit Plans (Tables)
 9 Months Ended
Dec. 31, 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 December 31,Three Months Ended December 31,
(in thousands of dollars)2024202320242023
Service cost$1,315 $1,280 $22 $24 
Interest cost2,875 2,897 259 263 
Expected return on plan assets(3,606)(3,887)(13)(15)
Net amortization and deferral174 205 (157)(189)
Net periodic benefit cost
$758 $495 $111 $83 
Pension BenefitsOther Postretirement Benefits
Nine Months Ended December 31,Nine Months Ended December 31,
(in thousands of dollars)2024202320242023
Service cost$3,956 $3,848 $69 $73 
Interest cost8,629 8,696 794 793 
Expected return on plan assets(10,820)(11,663)(41)(47)
Net amortization and deferral522 611 (477)(569)
Net periodic benefit cost
$2,287 $1,492 $345 $250