CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)	9 Months Ended	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2023	Mar. 31, 2022
Investment Income, Nonoperating [Abstract]
Interest income (excluding Payment-in-kind ("PIK") interest income)	$ 169,457,000
Dividend income	779,000
PIK interest income	2,662,000	$ 3,006,000	$ 4,075,000
Other income	2,711,000
Total Investment Income	175,609,000	276,522,000	213,155,000
Expenses
Management fees	26,621,000	17,369,000	36,142,000
Performance-based incentive fees	5,691,000	24,565,000	11,681,000
Interest and other debt expenses	59,363,000	104,198,000	55,020,000
Administrative services expense	4,188,000	5,840,000	5,835,000
Other general and administrative expenses	6,551,000	10,131,000	9,106,000
Total expenses	102,414,000	162,103,000	117,784,000
Performance-based incentive fee offset	(178,000)	(274,000)	(247,000)
Expense reimbursements	(770,000)
Expense reimbursements	(770,000)	(1,306,000)	(343,000)
Net Expenses	101,466,000	160,523,000	117,194,000
Net Investment Income	74,143,000	115,999,000	95,961,000
Net realized gains (losses):
Foreign currency transactions	273,000	69,000	(5,586,000)
Net realized gains (losses)	(69,239,000)	200,000	(67,367,000)
Net change in unrealized gains (losses):
Foreign currency translations	4,431,000	(2,548,000)	9,178,000
Net change in unrealized gains (losses)	18,036,000	2,561,000	53,770,000
Net Realized and Change in Unrealized Gains (Losses)	(51,203,000)	2,761,000	(13,597,000)
Net Increase (Decrease) in Net Assets Resulting from Operations	$ 22,940,000	$ 118,760,000	$ 82,364,000
Earnings (Loss) Per Share - Basic	$ 0.36	$ 1.82	$ 1.28
Non-controlled/Non-affiliated Investments
Investment Income, Nonoperating [Abstract]
Interest income (excluding Payment-in-kind ("PIK") interest income)	$ 143,564,000	$ 249,102,000	$ 164,878,000
Dividend income	61,000	409,000	560,000
PIK interest income	1,156,000	2,012,000	2,652,000
Other income	2,234,000	3,727,000	5,060,000
Net realized gains (losses):
Net realized gains (losses) on Investments	1,977,000	131,000	2,977,000
Net change in unrealized gains (losses):
Unrealized Gain (Loss) on Investments	(35,113,000)	(1,326,000)	2,184,000
Non-controlled/Affiliated Investments
Investment Income, Nonoperating [Abstract]
Interest income (excluding Payment-in-kind ("PIK") interest income)	363,000	1,126,000	190,000
Dividend income	718,000	1,010,000	1,290,000
PIK interest income	58,000	125,000	71,000
Net realized gains (losses):
Net realized gains (losses) on Investments	(2,224,000)		541,000
Net change in unrealized gains (losses):
Unrealized Gain (Loss) on Investments	(5,008,000)	3,799,000	15,398,000
Controlled Investments
Investment Income, Nonoperating [Abstract]
Interest income (excluding Payment-in-kind ("PIK") interest income)	25,530,000	17,892,000	35,043,000
Dividend income			2,059,000
PIK interest income	1,448,000	869,000	1,352,000
Other income	477,000	250,000
Net realized gains (losses):
Net realized gains (losses) on Investments	(69,265,000)		(65,299,000)
Net change in unrealized gains (losses):
Unrealized Gain (Loss) on Investments	$ 53,726,000	$ 2,636,000	$ 27,010,000