Organization - Additional Information (Details) $ / shares in Units, $ in Thousands, shares in Millions				3 Months Ended			12 Months Ended	228 Months Ended
	Aug. 02, 2022 USD ($) $ / shares	Oct. 30, 2018	Apr. 08, 2004 USD ($) $ / shares shares	Mar. 31, 2023 USD ($)	Sep. 30, 2022 USD ($)	Mar. 31, 2022 USD ($)	Mar. 31, 2022 USD ($)	Mar. 31, 2023 USD ($)
Organization [Line Items]
Operations commenced date			Apr. 08, 2004
Proceeds from initial public offering			$ 870,000
Common stock shares issued | shares			62.0
Common stock issued, price per share | $ / shares	$ 15.52		$ 15.00
Stock issued, reverse stock splits | shares			20.7
Shares Issued Price Per Share Adjusted for Reverse Stock Splits | $ / shares			$ 45.00
Reverse stock split, conversion ratio		0.0033
Net proceeds from additional offerings of common stock	$ 30,000,000				$ 30,000		$ 0	$ 2,240,067
Repurchased common stock value						$ 770		$ 245,810
Maximum
Organization [Line Items]
Middle market investment companies EBIDTA				$ 75,000