Related Party Transactions (Related Party Costs and Expenses) (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2022
Related Party Cost and Expense [Abstract]
Related party expenses, total	$ 90,100	$ 90,500	$ 90,700
Blackwater [Member]
Related Party Cost and Expense [Abstract]
Related party expenses, total	90,110	90,483	90,733
Blackwater [Member] | Lease Expense [Member]
Related Party Cost and Expense [Abstract]
Related party expenses, total	2,416	2,416	2,445
Blackwater [Member] | Selling and Marketing Expense [Member]
Related Party Cost and Expense [Abstract]
Related party expenses, total	3,681
Blackwater [Member] | Commission Expense [Member]
Related Party Cost and Expense [Abstract]
Related party expenses, total	82,095	88,067	88,288
Mercury [Member] | Lease Expense [Member]
Related Party Cost and Expense [Abstract]
Related party expenses, total	25
Mercury [Member] | Commission Expense [Member]
Related Party Cost and Expense [Abstract]
Related party expenses, total	$ 1,893