Annual report [Section 13 and 15(d), not S-K Item 405]

NET INCREASE (DECREASE) IN NET ASSETS RESULTING FROM OPERATIONS PER WEIGHTED-AVERAGE COMMON SHARE (Details)

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NET INCREASE (DECREASE) IN NET ASSETS RESULTING FROM OPERATIONS PER WEIGHTED-AVERAGE COMMON SHARE (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2023
Earnings Per Share [Abstract]      
Numerator: net increase in net assets resulting from operations $ 65,319 $ 85,305 $ 35,547
Weighted-average common shares, basic (in shares) 36,735,218 34,466,724 33,311,785
Weighted-average common shares, diluted (in shares) 36,735,218 34,466,724 33,311,785
Net increase (decrease) in net assets resulting from operations per weighted-average common share, basic (in USD per share) $ 1.78 $ 2.47 $ 1.07
Net increase (decrease) in net assets resulting from operations per weighted-average common share, diluted (in USD per share) $ 1.78 $ 2.47 $ 1.07