Employee Benefit Plans (Components of net periodic post retirement benefit cost) (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2020
Postemployment Benefits [Abstract]
Service cost for benefits earned during the period	$ 1,401	$ 1,267	$ 1,055
Interest cost on accumulated postretirement benefit	908	919	964
Other components	212	68	90
Total other components of net periodic benefit costs	1,120	987	1,054
Net periodic postretirement benefit cost	$ 2,521	$ 2,254	$ 2,109