Employee Benefit Plans (Components of net periodic post retirement benefit cost) (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2021
Postemployment Benefits [Abstract]
Service cost for benefits earned during the period	$ 1,326	$ 1,401	$ 1,267
Interest cost on accumulated postretirement benefit	1,148	908	919
Other components	68	212	68
Total other components of net periodic benefit costs	1,216	1,120	987
Net periodic postretirement benefit cost	$ 2,542	$ 2,521	$ 2,254