Annual report pursuant to Section 13 and 15(d)

DISTRIBUTIONS TO COMMON STOCKHOLDERS - Narrative (Details)

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DISTRIBUTIONS TO COMMON STOCKHOLDERS - Narrative (Details) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2022
Dec. 31, 2021
Equity [Abstract]          
Investment company, cash distributions paid to common stockholders from ordinary income       61.20% 71.30%
Investment company, cash distributions paid to common stockholders from capital gains       38.80% 28.70%
Cash distributions to common stockholders $ 47,000 $ 38,900 $ 30,900    
Distributions paid subsequent to fiscal year-end, classified in prior year, ordinary income 21,380 13,862 16,100    
Distribution paid subsequent to fiscal year-end, classified in prior year, capital gains $ 10,552 $ 15,731 $ 8,500    
Investment company, deemed distribution approach, notice period 60 days