Borrowings (Interest Rates and Company Borrowings) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Interest and debt expense:
Weighted average interest rate during the quarter	6.51%	3.32%	6.38%	2.66%
Interest rate at quarter end	6.61%	3.80%	6.61%	3.80%
Maximum amount outstanding during the quarter	$ 605,000	$ 1,102,000	$ 715,000	$ 1,105,000
Average amount outstanding during the quarter	596,322	877,522	628,151	984,464
Facility fees	$ 306	$ 111	$ 571	$ 169