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Pension and Other Postretirement Benefits (Tables)
6 Months Ended
Sep. 30, 2020
Retirement Benefits [Abstract]  
Schedule of Net Periodic Benefit Cost
The following summarizes the components of net periodic benefit cost:

Defined Benefit Plans
SuccessorPredecessor
One month ended September 30, 2020Two months ended August 31, 2020Three months ended September 30, 2019
Operating expenses:
Service cost$36 $70 $117 
Interest expense:
Interest expense226 638 1,029 
Expected return on plan assets(244)(494)(1,121)
Amortization of prior service cost— 10 
Settlement loss(1)
— — 548 
Actuarial loss— 347 456 
Net periodic pension cost$18 $568 $1,039 

Defined Benefit Plans
SuccessorPredecessor
One month ended September 30, 2020Five months ended August 31, 2020Six months ended September 30, 2019
Operating expenses:
Service cost$36 $176 $235 
Interest expense:
Interest expense226 1,594 2,059 
Expected return on plan assets(244)(1,234)(2,242)
Amortization of prior service cost— 17 21 
Settlement loss(1)
— — 548 
Actuarial loss— 868 912 
Net periodic pension cost$18 $1,421 $1,533 
Other Postretirement Benefits
SuccessorPredecessor
One month ended September 30, 2020Two months ended August 31, 2020Three months ended September 30, 2019
Operating expenses:
Service cost$$$
Interest expense:
Interest expense18 46 82 
Amortization of prior service cost— (118)(177)
Actuarial loss— 63 109 
Net periodic pension cost / (benefit)$19 $(8)$16 

Other Postretirement Benefits
SuccessorPredecessor
One month ended September 30, 2020Five months ended August 31, 2020Six months ended September 30, 2019
Operating expenses:
Service cost$
Interest expense:
Interest expense18 114 164 
Amortization of prior service cost— (294)(354)
Actuarial loss— 157 219 
Net periodic pension cost / (benefit)$19 $(20)$32 
Schedule of Contributions to Pensions Plans and Postretirement Health and Life Insurance Benefits
The following summarizes contributions to pension plans and postretirement health and life insurance benefits:

SuccessorPredecessor
One month ended September 30, 2020Two months ended August 31, 2020Three months ended September 30, 2019
Contributions made during the period$651 $1,066 $1,615 

SuccessorPredecessor
One month ended September 30, 2020Five months ended August 31, 2020Six months ended September 30, 2019
Contributions made during the period$651 $1,941 $3,180 
Contributions expected for the remainder of the fiscal year3,245 — 3,942 
Total$3,896 $1,941 $7,122