Related Party Transactions (Related Party Costs and Expenses) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Related party cost and expense:
Costs and Expenses, Related Party	$ 32,900	$ 25,600	$ 63,422	$ 49,263
Blackwater [Member]
Related party cost and expense:
Costs and Expenses, Related Party	32,854	25,607
Lease expenses | Blackwater [Member]
Related party cost and expense:
Costs and Expenses, Related Party	604	604	1,208	1,208
Lease expenses | Mercury [Member]
Related party cost and expense:
Costs and Expenses, Related Party	38		76
Printing expenses | Blackwater [Member]
Related party cost and expense:
Costs and Expenses, Related Party	1,455	968	2,558	1,317
Commission expenses | Blackwater [Member]
Related party cost and expense:
Costs and Expenses, Related Party	24,434	$ 24,035	47,129	$ 46,738
Commission expenses | Mercury [Member]
Related party cost and expense:
Costs and Expenses, Related Party	$ 6,323		$ 12,451