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Financial Highlights - Summary of Financial Highlights (Details) (Parenthetical)
$ in Thousands
1 Months Ended 12 Months Ended
Sep. 30, 2019
shares
Sep. 30, 2018
shares
Sep. 30, 2020
shares
Sep. 30, 2022
USD ($)
$ / shares
shares
Investment Company Financial Highlights [Line Items]        
Ratio of operating expenses to average net assets before the waiver 5.26% 5.21% 4.65%  
Ratio of total expenses to average net assets before the waiver 11.48% 8.75% 9.12%  
Amount used to multiply asset coverage ratio to determine the asset coverage per unit | $       $ 1,000
Capital outstanding | shares 0 0 0 0
2025 Notes        
Investment Company Financial Highlights [Line Items]        
Increment in issued price per unit       25
2024 Notes        
Investment Company Financial Highlights [Line Items]        
Increment in issued price per unit       25