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CONSOLIDATED SCHEDULES OF INVESTMENTS (Parenthetical) 7 - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended
Dec. 31, 2025
Jun. 30, 2026
Jun. 30, 2025
Schedule of Investments [Line Items]      
Fair Value   $ 6,342,558 [1] $ 6,673,516 [2]
Prospect Capital Funding LLC      
Schedule of Investments [Line Items]      
Fair Value   $ 2,155,016 $ 2,520,620
Prospect Capital Funding LLC | Investments Held Benchmark | Total Investments Concentration Risk      
Schedule of Investments [Line Items]      
% of Portfolio 37.80% 34.00%  
[1] Fair value is determined by or under the direction of our Board of Directors. Unless otherwise indicated by endnote 42 below, all of our investments are valued using significant unobservable inputs. In accordance with ASC 820, such investments are classified as Level 3 within the fair value hierarchy. See Notes 2 and 3 within the accompanying notes to consolidated financial statements for further discussion.
[2] Fair value is determined by or under the direction of our Board of Directors. Unless otherwise indicated by endnote 42 below, all of our investments are valued using significant unobservable inputs. In accordance with ASC 820, such investments are classified as Level 3 within the fair value hierarchy. See Notes 2 and 3 within the accompanying notes to consolidated financial statements for further discussion.