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Pension and Benefit Plans (Details)
$ in Thousands
12 Months Ended
Mar. 31, 2018
USD ($)
Defined Benefit Plan Disclosure [Line Items]  
Effect on total of service and interest cost components, One Percentage Point Increase $ 6
Effect on postretirement obligation, One Percentage Point Increase 161
Effect on total of service and interest cost components, One Percentage Point Decrease (5)
Effect on postretirement obligation, One Percentage Point Decrease $ (147)