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Benefit Plans (Expected payments to be made to plan participants) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2017
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Gross Prescription Drug Subsidy Receipts Received (Deprecated 2017-01-31) $ 706 $ 383  
Defined Benefit Plan, Amortization of Prior Service Cost (Credit) 51    
Other Defined Benefit Pension Plans [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) (4,402) (697)  
Defined Benefit Plan, Expected Future Benefit Payment, Next Twelve Months 5,613    
Defined Benefit Plan, Expected Future Benefit Payments in Year Two 5,767    
Defined Benefit Plan, Expected Future Benefit Payments in Year Three 5,928    
Defined Benefit Plan, Expected Future Benefit Payments in Year Four 6,441    
Defined Benefit Plan, Expected Future Benefit Payments in Year Five 6,254    
Defined Benefit Plan, Expected Future Benefit Payments in Five Fiscal Years Thereafter 34,102    
Defined Benefit Plan, Amortization of Prior Service Cost (Credit) 831 0 $ 0
Other Postretirement Benefit Plans, Defined Benefit      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) (106) (501)  
Defined Benefit Plan, Expected Future Benefit Payment, Next Twelve Months 1,633    
Defined Benefit Plan, Expected Future Benefit Payments in Year Two 1,499    
Defined Benefit Plan, Expected Future Benefit Payments in Year Three 1,394    
Defined Benefit Plan, Expected Future Benefit Payments in Year Four 1,261    
Defined Benefit Plan, Expected Future Benefit Payments in Year Five 1,139    
Defined Benefit Plan, Expected Future Benefit Payments in Five Fiscal Years Thereafter 4,244    
Defined Benefit Plan, Amortization of Prior Service Cost (Credit) $ (3,263) $ (3,263) $ (3,263)