Employee Benefit Plans (Components of Postretirement Benefit Liabilities) (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2021
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Beginning of year	$ 30,206	$ 30,755
Service cost for benefits earned during the period	1,326	1,401	$ 1,267
Interest cost on accumulated post retirement benefit	1,148	908	919
Net benefit payments and expense	(1,207)	(1,021)
Actuarial loss	(2,703)	(1,837)
Accumulated postretirement benefit obligation	28,770	30,206	$ 30,755
Liabilities:
Current liabilities	1,625	1,449
Non-currrent liabilities	27,145	28,757
Total post retirement benefit liability recognized in statement of financial position	28,770	30,206
Components included in accumulated other comprehensive income (loss):
Unrecognized net loss	(465)	(3,237)
Cumulative net periodic benefit cost (in excess of employer contribution)	$ 28,305	$ 26,969