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, 2026
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2023
Mar. 31, 2022
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2017
Earnings Per Share [Abstract]                    
Numerator: net increase in net assets resulting from operations $ 184,753 $ 65,319 $ 85,305              
Basic weighted-average common shares (in shares) 38,712,611 36,735,218 34,466,724 33,311,785 33,205,023 33,176,760 32,865,840 32,807,597 32,268,776 30,270,958
Diluted weighted-average common shares (in shares) 38,712,611 36,735,218 34,466,724 33,311,785 33,205,023 33,176,760 32,865,840 32,807,597 32,268,776 30,270,958
Basic net increase in net assets resulting from operations per weighted-average common share (in USD per share) $ 4.77 $ 1.78 $ 2.47              
Diluted net increase in net assets resulting from operations per weighted-average common share (in USD per share) $ 4.77 $ 1.78 $ 2.47