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Net Periodic Benefit Cost (Tables)
 6 Months Ended
Sep. 30, 2021
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, 2021September 30, 2020September 30, 2021September 30, 2020
Service costs$248 $292 $502 $553 
Interest cost2,503 2,916 5,079 6,031 
Expected return on plan assets(3,259)(3,229)(6,520)(6,707)
Net amortization363 851 733 1,732 
Settlement— 16,324 — 19,046 
Net periodic pension (benefit) cost$(145)$17,154 $(206)$20,655 
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 (benefit) for the Company’s defined benefit postretirement plans (in thousands):
 Three Months EndedSix Months Ended
 September 30, 2021September 30, 2020September 30, 2021September 30, 2020
Interest cost$8 $14 $16 $28 
Amortization of plan net losses(55)(52)(110)(104)
Net periodic postretirement (benefit) cost$(47)$(38)$(94)$(76)