v3.25.2
Portfolio Investments - Industries and Geographical Locations Comprising Greater than 10% of Portfolio Fair Value (Details) - USD ($)
$ in Thousands
 12 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Concentration Risk [Line Items]    
Cost $ 6,693,501 $ 7,447,174
Fair Value $ 6,673,516 [1] $ 7,718,243 [2]
Investments at Fair Value | Industry Concentration Risk    
Concentration Risk [Line Items]    
% of Portfolio 100.00% 100.00%
Equity Real Estate Investment Trusts (REITs)    
Concentration Risk [Line Items]    
Cost $ 922,647 $ 897,181
Fair Value $ 1,300,972 $ 1,485,332
Equity Real Estate Investment Trusts (REITs) | Investments at Fair Value | Industry Concentration Risk    
Concentration Risk [Line Items]    
% of Portfolio 19.50% 19.10%
Consumer Finance    
Concentration Risk [Line Items]    
Cost $ 741,932 $ 623,033
Fair Value $ 953,320 $ 728,320
Consumer Finance | Investments at Fair Value | Industry Concentration Risk    
Concentration Risk [Line Items]    
% of Portfolio 14.30% 9.40%
Healthcare Providers & Services    
Concentration Risk [Line Items]    
Cost $ 767,993 $ 739,721
Fair Value $ 731,527 $ 821,921
Healthcare Providers & Services | Investments at Fair Value | Industry Concentration Risk    
Concentration Risk [Line Items]    
% of Portfolio 11.00% 10.60%
All Other Industries    
Concentration Risk [Line Items]    
Cost $ 4,260,929 $ 5,187,239
Fair Value $ 3,687,697 $ 4,682,670
All Other Industries | Investments at Fair Value | Industry Concentration Risk    
Concentration Risk [Line Items]    
% of Portfolio 55.20% 60.90%
[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.