Interest on Borrowings (Interest Rates and Company Borrowings) (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2022
Interest and debt expense:
Weighted average interest rate during the year	6.51%	3.93%	1.40%
Interest rate at year end	6.61%	5.89%	1.49%
Maximum amount outstanding during the year	$ 715,000	$ 1,105,000	$ 1,105,000
Average amount outstanding during the year	631,653	824,211	1,085,074
Facility fees	$ 1,139	$ 733	$ 253