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

DISTRIBUTIONS TO COMMON STOCKHOLDERS - Investment Company, Changes in Net Assets (Details)

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DISTRIBUTIONS TO COMMON STOCKHOLDERS - Investment Company, Changes in Net Assets (Details) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Underdistributed (overdistributed) net investment income    
Investment Company, Changes in Net Assets [Line Items]    
Increase (decrease) due to reclassifications of permanent differences $ 9,623 $ 1,695
Accumulated net realized gain in excess of distributions    
Investment Company, Changes in Net Assets [Line Items]    
Increase (decrease) due to reclassifications of permanent differences (8,424) (881)
Capital in excess of par value    
Investment Company, Changes in Net Assets [Line Items]    
Increase (decrease) due to reclassifications of permanent differences $ (1,199) $ (814)