Annual report pursuant to Section 13 and 15(d)

BORROWINGS - Schedule of Debt (Details)

v3.23.1
BORROWINGS - Schedule of Debt (Details) - USD ($)
Mar. 31, 2023
Mar. 31, 2022
Aug. 31, 2021
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2014
Debt Instrument [Line Items]                      
Aggregate Principal Amount $ 297,688,000 $ 267,584,000   $ 155,434,000 $ 54,296,000 $ 58,096,000 $ 112,096,000 $ 74,796,000 $ 100,096,000 $ 123,896,000 $ 66,250,000
Total borrowings $ 292,607,000 $ 261,348,000                  
Indebtedness asset coverage on our senior securities 244.70% 252.90%                  
Notes Payable                      
Debt Instrument [Line Items]                      
Notes Outstanding $ 10,499,500,000 $ 10,499,500                  
Aggregate Principal Amount 262,488,000 262,488,000                  
Less: Unamortized Discounts (5,052,000) (6,236,000)                  
Total borrowings $ 257,436,000 $ 256,252,000                  
Notes Payable | 2026 Notes                      
Debt Instrument [Line Items]                      
Interest Rate 5.00% 5.00%   5.00%              
Notes Outstanding $ 5,117,500 $ 5,117,500                  
Principal Amount per Note 25,000.00 25,000.00                  
Aggregate Principal Amount $ 127,938,000 $ 127,938,000   $ 127,900,000              
Notes Payable | 2028 Notes                      
Debt Instrument [Line Items]                      
Interest Rate 4.875% 4.875% 4.875%                
Notes Outstanding $ 5,382,000 $ 5,382,000                  
Principal Amount per Note 25,000.00 25,000.00                  
Aggregate Principal Amount $ 134,550,000 $ 134,550,000 $ 134,600,000