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Benefit Plans (Components of the annual net periodic benefit cost) (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, Interest Cost $ 3,139    
Defined Benefit Plan, Amortization of Prior Service Cost (Credit) 51    
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, before Tax 15,326    
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, Service Cost 0 0 $ 0
Defined Benefit Plan, Interest Cost 457 519 554
Defined Benefit Plan, Expected Return (Loss) on Plan Assets 0 0
Defined Benefit Plan, Amortization of Prior Service Cost (Credit) (3,263) (3,263) (3,263)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) (2,254) (2,096) (1,970)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement and Curtailment 552 648 739
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, before Tax 106 501 531
Defined Benefit Plan, Amortization of Net Prior Service Cost (Credit) 3,263 3,263 3,263
Defined Benefit Plan, Amortization of Net Gains (Losses) (552) (648) (739)
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, before Tax 2,817 3,116 3,055
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss), Net Gain (Loss), before Tax 563 1,020 1,085
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, Service Cost 2,394 2,402 1,650
Defined Benefit Plan, Interest Cost 3,255 3,262 3,434
Defined Benefit Plan, Expected Return (Loss) on Plan Assets (4,930) (4,835) (2,853)
Defined Benefit Plan, Amortization of Prior Service Cost (Credit) 831 0 0
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) 1,128 955 2,231
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement and Curtailment 474 126 0
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, before Tax (6,545) (697) (7,553)
Defined Benefit Plan, Amortization of Net Prior Service Cost (Credit) 781 0 0
Defined Benefit Plan, Amortization of Net Gains (Losses) (468) (126) 0
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, before Tax (6,232) (823) (7,553)
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss), Net Gain (Loss), before Tax (5,104) $ 132 $ (5,322)
Amortization of prior service cost next fiscal year 71    
Other Pension Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Amortization of prior service cost next fiscal year $ (3,263)