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Benefit Plans Benefit Plans (Rollforward of Level 3 assets) (Details) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Mar. 31, 2021
Defined Benefit Plan Disclosure [Line Items]      
Other Investments $ 5,387 $ 5,383 $ 5,555
Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Period Increase (Decrease) (157) (115)  
Defined Benefit Plan, Plan Assets, Foreign Currency Translation Gain (Loss) (159) 153  
Fair Value, Inputs, Level 3 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Increase (Decrease) for Assets Transferred into (out of) Level 3 $ 320 $ (210)