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Pension And Other Postretirement Benefit Plans
 6 Months Ended
Sep. 30, 2021
Retirement Benefits [Abstract]  
Pension and Other Postretirement Benefits Disclosure PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS
The Company sponsors several defined benefit pension plans covering eligible U.S. salaried employees and certain foreign and other employee groups. These plans provide retirement benefits based primarily on employee compensation and years of service. The Company also sponsors defined benefit plans that provide postretirement health and life insurance benefits for eligible U.S. employees attaining specific age and service levels, although postretirement life insurance is no longer provided for active employees.

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)2021202020212020
Service cost$1,653 $1,547 $47 $49 
Interest cost2,254 2,459 241 286 
Expected return on plan assets(3,387)(3,679)(22)(24)
Net amortization and deferral976 1,120 (116)(142)
Net periodic benefit cost
$1,496 $1,447 $150 $169 
Pension BenefitsOther Postretirement Benefits
Six Months Ended September 30,Six Months Ended September 30,
(in thousands of dollars)2021202020212020
Service cost$3,303 $3,088 $94 $97 
Interest cost4,513 4,913 480 573 
Expected return on plan assets(6,772)(7,356)(44)(48)
Net amortization and deferral1,952 2,241 (231)(285)
Net periodic benefit cost
$2,996 $2,886 $299 $337 

During the six months ended September 30, 2021, the Company made contributions of approximately $4.3 million to its pension plans. Additional contributions of $1.9 million are expected during the remaining six months of fiscal year 2022.