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Net Periodic Benefit Cost (Tables)
 6 Months Ended
Sep. 30, 2020
Pension Plans, Defined Benefiit  
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]  
Schedule of Net Benefit Costs
The following table sets forth the components of net periodic pension cost for the Company’s defined benefit pension plans (in thousands):
 Three Months EndedSix Months Ended
 September 30, 2020September 30, 2019September 30, 2020September 30, 2019
Service costs$292 $248 $553 $515 
Interest cost2,916 3,676 6,031 7,375 
Expected return on plan assets(3,229)(3,972)(6,707)(7,945)
Net amortization851 571 1,732 1,140 
Settlement16,324 — 19,046 — 
Net periodic pension (benefit) cost$17,154 $523 $20,655 $1,085 
Postemployment Retirement Benefits [Member]  
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]  
Schedule of Net Benefit Costs
The following table sets forth the components of net periodic postretirement benefit cost for the Company’s defined benefit postretirement plans (in thousands):
 Three Months EndedSix Months Ended
 September 30, 2020September 30, 2019September 30, 2020September 30, 2019
Interest cost$14 $20 $28 $40 
Amortization of plan net losses(52)(40)(104)(80)
Net periodic postretirement (benefit) cost$(38)$(20)$(76)$(40)