Income Taxes - Summary of Reconciliation of Net Increase in Net Assets Resulting from Operations to Taxable Income (Details) - USD ($) $ in Thousands	3 Months Ended												9 Months Ended		12 Months Ended
	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2023	Mar. 31, 2022
Income Tax Disclosure [Abstract]
Net increase (decrease) in net assets resulting from operations	$ 33,262	$ 29,963	$ 25,404	$ 30,132	$ 1,288	$ 15,993	$ 5,659	$ 4,239	$ 20,540	$ 25,441	$ 32,144	$ 42,411	$ 88,628	$ 22,940	$ 118,760	$ 82,364
Net realized losses (gains)													(1,034)	69,239	(200)	67,367
Net change in unrealized losses (gains)													$ (1,078)	(18,036)	(2,561)	(53,770)
Income (loss) recognized for tax but not book														(1,419)	26,064	4,596
Realized gain/loss differences														(7,723)	(7,084)	(13,316)
Taxable income before deductions for distributions														$ 65,001	$ 134,979	$ 87,241