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Benefit Plans (Accumulated benefit obligation exceeding the fair value of plan assets) (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2017
Sep. 30, 2008
Defined Benefit Plan Disclosure [Line Items]        
Defined Benefit Plan, Accumulated Benefit Obligation       $ 46,001
Other Defined Benefit Pension Plans [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Defined Benefit Plan, Plan Assets, Amount $ 117,504 $ 119,441 $ 101,663  
Defined Benefit Plan, Accumulated Benefit Obligation 130,669 148,848    
defined benefit plans, aggregate projected benefit obligation $ 133,672 $ 148,848