Consolidated Statements of Operations (unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Mar. 31, 2026	Mar. 31, 2025
Investment income
Payment-in-kind interest income	$ 17,132	$ 14,045	$ 31,651	$ 25,061
Total investment income	188,134	213,892	395,141	434,592
Expenses
Interest and other debt financing expenses	61,069	69,911	127,383	149,554
Base management fee	21,035	21,714	43,150	43,295
Incentive fee	15,542	18,247	32,999	36,305
Administrative service fee	2,939	3,185	6,119	6,087
Professional fees	1,627	1,765	3,412	3,605
General and administrative expenses	375	408	773	969
Total expenses	102,587	115,230	213,836	239,815
Net investment income - before tax	85,547	98,662	181,305	194,777
Excise and income tax benefit	0	0	0	(475)
Net investment income - after tax	85,547	98,662	181,305	195,252
Net realized gain (loss) from:
Non-controlled/non-affiliate company investments			(4,169)	(42,220)
Foreign currency transactions	1,354	(174)	234	(3,879)
Forward currency contracts	(10,258)	5,997	(10,258)	7,203
Net realized gain (loss) on investment transactions	(10,355)	(11,041)	(14,193)	(38,896)
Net change in unrealized appreciation (depreciation) from:
Company investments			(160,646)	38,906
Translation of assets and liabilities in foreign currencies	(4,398)	11,427	(2,350)	(11,546)
Net change in unrealized appreciation (depreciation) on investment transactions	(121,988)	(8,783)	(148,662)	33,792
Net gain (loss) on investment transactions	(132,343)	(19,824)	(162,855)	(5,104)
Net realized gain (loss) on extinguishment of debt	0	0	0	(48)
Benefit for taxes on unrealized appreciation on investments	0	146	0	198
Net increase (decrease) in net assets resulting from operations	$ (46,796)	$ 78,984	$ 18,450	$ 190,298
Per Common Share Data
Basic earnings per common share (Note 10) (in dollars per share)	$ (0.18)	$ 0.30	$ 0.07	$ 0.72
Diluted earnings per common share (Note 10) (in dollars per share)	(0.18)	0.30	0.07	0.72
Dividends and distributions declared per common share (in dollars per share)	$ 0.33	$ 0.39	$ 0.72	$ 0.87
Basic weighted average common shares outstanding (Note 10) (in shares)	262,676,687	266,484,213	263,183,214	265,402,101
Diluted weighted average common shares outstanding (Note 10) (in shares)	262,676,687	266,484,213	263,183,214	265,402,101
Foreign exchange
Net realized gain (loss) from:
Forward currency contracts	$ (10,258)	$ 5,997	$ (10,258)	$ 7,203
Net change in unrealized appreciation (depreciation) from:
Forward currency contracts	14,042	(15,495)	14,334	6,432
Non-controlled/non-affiliate company investments
Investment income
Interest income	162,002	188,017	343,683	386,378
Payment-in-kind interest income	15,684	13,512	28,798	24,077
Dividend income	6,360	7,877	13,979	16,364
Fee income	739	1,690	1,818	2,245
Total investment income	184,785	211,096	388,278	429,064
Net realized gain (loss) from:
Non-controlled/non-affiliate company investments	(1,451)	(16,864)	(4,169)	(42,220)
Net change in unrealized appreciation (depreciation) from:
Company investments	(119,789)	(1,341)	(138,065)	38,744
Non-controlled affiliate company investments
Investment income
Interest income	1,874	2,241	3,949	4,484
Payment-in-kind interest income	1,315	414	2,588	746
Fee income	22	18	52	49
Total investment income	3,211	2,673	6,589	5,279
Net realized gain (loss) from:
Non-controlled/non-affiliate company investments			0
Net change in unrealized appreciation (depreciation) from:
Company investments	(12,522)	(2,933)	(21,946)	689
Controlled affiliate company investments
Investment income
Payment-in-kind interest income	133	119	265	238
Fee income	5	4	9	11
Total investment income	138	123	274	249
Net realized gain (loss) from:
Non-controlled/non-affiliate company investments			0
Net change in unrealized appreciation (depreciation) from:
Company investments	$ 679	$ (441)	$ (635)	$ (527)