CONSOLIDATED STATEMENTS OF ASSETS AND LIABILITIES (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2024		Mar. 31, 2024
Cost	$ 1,522,664	[1],[2],[3],[4],[5],[6],[7],[8]	$ 1,476,703	[9],[10],[11],[12],[13],[14],[15],[16]
Accumulated amortization	9,013		7,741
Unamortized debt issuance costs	$ 7,844		$ 9,022
Common stock, par value (in usd per share)	$ 0.25		$ 0.25
Common stock, authorized (in shares)	75,000,000		75,000,000
Common stock, issued (in shares)	47,686,685		45,050,759
Common stock, outstanding (in shares)	47,686,685		45,050,759
SBA Debentures
Unamortized debt issuance costs	$ 3,936		$ 4,305
January 2026 Notes
Unamortized debt issuance costs	443		612
October 2026 Notes
Unamortized debt issuance costs	1,538		1,923
August 2028 Notes
Unamortized debt issuance costs	1,927		2,182
Non-control/Non-affiliate investments
Cost	1,301,871		1,276,690
Affiliate investments
Cost	212,180		200,013
Control investments
Cost	$ 8,613		$ 0

[1] As of September 30, 2024, the cumulative gross unrealized appreciation for U.S. federal income tax purposes was approximately $96.0 million; cumulative gross unrealized depreciation for federal income tax purposes was $125.6 million. Cumulative net unrealized depreciation was $29.6 million, based on a tax cost of $1,538.1 million.

[2] Equity ownership may be held in shares or units of a company that is either wholly owned by the portfolio company or under common control by the same parent company to the portfolio company.

[3] Negative cost in this column represents the original issue discount of certain undrawn revolvers and delayed draw term loans.

[4] Unless otherwise noted, all portfolio company headquarters are based in the United States.

[5] Affiliate investments are generally defined by the 1940 Act as investments in which between 5% and 25% of the voting securities are owned and the investments are not classified as control investments. At September 30, 2024, the Company held $201.9 million of affiliate investments, which represented approximately 13.4% of the Company’s investment assets. The fair value of these investments as a percent of net assets is 25.5%.

[6] All debt investments are income-producing, unless otherwise noted. Equity investments are non-income producing, unless otherwise noted.

[7] Control investments are generally defined by the 1940 Act as investments in which more than 25% of the voting securities are owned. At September 30, 2024, the Company held $9.4 million of control investments, which represented approximately 0.6% of the Company's investment assets. The fair value of these investments as a percent of net assets is 1.2%.

[8] Non-Control/Non-Affiliate investments are generally defined by the 1940 Act as investments that are neither control investments nor affiliate investments. At September 30, 2024, the Company held $1,297.3 million of non-control/non-affiliate investments, which represented approximately 86.0% of the Company’s investment assets. The fair value of these investments as a percent of net assets is 163.9%.

[9] As of March 31, 2024, the cumulative gross unrealized appreciation for U.S. federal income tax purposes was approximately $96.3 million; cumulative gross unrealized depreciation for federal income tax purposes was $96.4 million. Cumulative net unrealized depreciation was $0.1 million, based on a tax cost of $1,471.1 million.

[10] Equity ownership may be held in shares or units of a company that is either wholly owned by the portfolio company or under common control by the same parent company to the portfolio company.

[11] Negative cost in this column represents the original issue discount of certain undrawn revolvers and delayed draw term loans.

[12] Unless otherwise noted, all portfolio company headquarters are based in the United States.

[13] Affiliate investments are generally defined by the 1940 Act as investments in which between 5% and 25% of the voting securities are owned and the investments are not classified as control investments. At March 31, 2024, the Company held $190.2 million of affiliate investments, which represented approximately 12.9% of the Company’s investment assets. The fair value of these investments as a percent of net assets is 25.2%.

[14] All debt investments are income-producing, unless otherwise noted. Equity investments are non-income producing, unless otherwise noted.

[15] Control investments are generally defined by the 1940 Act as investments in which more than 25% of the voting securities are owned. At March 31, 2024, the Company did not hold any control investments.

[16] Non-Control/Non-Affiliate investments are generally defined by the 1940 Act, as investments that are neither control investments nor affiliate investments. At March 31, 2024, the Company held $1,286.4 million of non-control/non-affiliate investments, which represented approximately 87.1% of the Company’s investment assets. The fair value of these investments as a percent of net assets is 170.2%.