Borrowings (Interest Rates and Company Borrowings) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2022	Dec. 31, 2021
Interest and debt expense:
Weighted average interest rate during the quarter	4.68%	1.38%	3.34%	1.38%
Interest rate at quarter end	5.28%	1.39%	5.28%	1.39%
Maximum amount outstanding during the quarter	$ 765,000	$ 1,085,000	$ 1,105,000	$ 1,093,000
Average amount outstanding during the quarter	710,109	1,081,283	892,680	1,081,571
Facility fees	$ 270	$ 66	$ 439	$ 198