Related Party Transactions (Related Party Assets) (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Mar. 31, 2023
Related party assets:
Related party assets	$ 40,140	$ 48,308
Blackwater [Member]
Related party assets:
Amounts due to related parties	37,791	42,141
Mercury [Member]
Related party assets:
Amounts due to related parties	6,654	8,402
Insurance Group [Member]
Related party assets:
Amounts due to related parties	$ (4,305)	$ (2,235)