v3.26.1
Benefit Plans (Components of the annual net periodic benefit cost) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Mar. 31, 2024
Defined Benefit Plan Disclosure [Line Items]      
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, before Tax $ 2,100    
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, before Tax [1] 200 $ (400) $ (600)
Other Postretirement Benefit Plans, Defined Benefit      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) (400) (600)  
Defined Benefit Plan, Service Cost 0 0 0
Defined Benefit Plan, Interest Cost 300 300 300
Defined Benefit Plan, Expected Return (Loss) on Plan Assets 0 0 0
Defined Benefit Plan, Amortization of Prior Service Cost (Credit) 0 0 0
Net amortization and deferral 0 100 200
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) 300 400 500
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement and Curtailment 0 0 0
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, before Tax 400 600 400
Defined Benefit Plan, Amortization of Net Prior Service Cost (Credit) 0 0 0
Defined Benefit Plan, Amortization of Net Gains (Losses) 0 (100) (200)
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, before Tax 300 400 200
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss), Net Gain (Loss), before Tax 600 900 800
Other Defined Benefit Pension Plans [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) (1,900) (9,100)  
Defined Benefit Plan, Service Cost 700 700 700
Defined Benefit Plan, Interest Cost 4,700 4,200 4,100
Defined Benefit Plan, Expected Return (Loss) on Plan Assets (5,400) (4,900) (6,100)
Defined Benefit Plan, Amortization of Prior Service Cost (Credit) 0 0 0
Net amortization and deferral 0 0 0
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) 200 100 (1,200)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement and Curtailment 0 0 0
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, before Tax 200 600 2,600
Defined Benefit Plan, Amortization of Net Prior Service Cost (Credit) (100) (100) (100)
Defined Benefit Plan, Amortization of Net Gains (Losses) 0 0 0
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, before Tax 200 500 2,500
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss), Net Gain (Loss), before Tax $ 300 $ 600 $ 1,300
[1] mortization (gain) of defined benefit plan costs is reported in the Interest and miscellaneous income line of our Consolidated Statements of Income.