Related Party Transactions (Related Party Revenue) (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Related party transactions:
Management fee revenue	$ 9,267	$ 9,277	$ 18,444	$ 18,416
Blackwater [Member]
Related party transactions:
Management fee revenue	7,754	7,827	15,450	15,556
Mercury [Member]
Related party transactions:
Management fee revenue	$ 1,513	$ 1,450	$ 2,994	$ 2,860

Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise.

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+ Details