Employee Benefit and Stock Compensation Plans Expected Fututre Annuity Payments (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2022	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Expected future annuity payments [Line Items]
Expected Future Annuity Payments	$ 720	$ 156	$ 162	$ 155	$ 161	$ 166
Total Annuity Payments							$ 1,520