v3.25.2
Borrowings - Schedule of Credit Facilities (Details) - USD ($)
Jun. 30, 2025
Sep. 30, 2024
Apr. 26, 2024
Feb. 23, 2024
Feb. 15, 2024
Nov. 21, 2023
Sep. 29, 2023
Feb. 24, 2023
Debt Instrument [Line Items]                
Outstanding Principal $ 1,638,900,000 $ 1,095,000,000            
Unfunded Commitment 1,000,470,000 642,044,000            
Unamortized Debt Financing Costs 7,126,000 8,526,000            
Line of Credit                
Debt Instrument [Line Items]                
Aggregate Principal Committed 2,735,000,000 2,685,000,000            
Outstanding Principal 1,638,900,000 1,095,000,000            
Unamortized Debt Financing Costs 19,400,000 20,100,000            
Line of Credit | Unfunded Loan Commitment                
Debt Instrument [Line Items]                
Unfunded Commitment 1,096,100,000 1,590,000,000            
ING Credit Agreement | Line of Credit                
Debt Instrument [Line Items]                
Aggregate Principal Committed 1,235,000,000 1,185,000,000            
Outstanding Principal 630,000,000.0 415,000,000.0            
Unamortized Debt Financing Costs 9,000,000.0 6,800,000            
ING Credit Agreement | Line of Credit | Unfunded Loan Commitment                
Debt Instrument [Line Items]                
Unfunded Commitment 605,000,000.0 770,000,000.0            
JPM SPV Facility | Line of Credit                
Debt Instrument [Line Items]                
Aggregate Principal Committed 500,000,000.0 500,000,000.0           $ 500,000,000
Outstanding Principal 375,000,000.0 230,000,000.0            
Unamortized Debt Financing Costs 4,400,000 5,200,000            
JPM SPV Facility | Line of Credit | Unfunded Loan Commitment                
Debt Instrument [Line Items]                
Unfunded Commitment 125,000,000.0 270,000,000.0            
SMBC SPV Facility | Line of Credit                
Debt Instrument [Line Items]                
Aggregate Principal Committed 150,000,000.0 150,000,000.0         $ 150,000,000  
Outstanding Principal 75,500,000 100,000,000.0            
Unamortized Debt Financing Costs 1,300,000 1,600,000            
SMBC SPV Facility | Line of Credit | Unfunded Loan Commitment                
Debt Instrument [Line Items]                
Unfunded Commitment 74,500,000 50,000,000.0            
CIBC SPV Facility | Line of Credit                
Debt Instrument [Line Items]                
Aggregate Principal Committed 350,000,000.0 350,000,000.0 $ 350,000,000     $ 150,000,000    
Outstanding Principal 245,000,000.0 225,000,000.0            
Unamortized Debt Financing Costs 400,000 1,300,000            
CIBC SPV Facility | Line of Credit | Unfunded Loan Commitment                
Debt Instrument [Line Items]                
Unfunded Commitment 105,000,000.0 125,000,000.0            
DBNY SPV Facility | Line of Credit                
Debt Instrument [Line Items]                
Aggregate Principal Committed 300,000,000.0 300,000,000.0     $ 300,000,000      
Outstanding Principal 180,000,000.0 100,000,000.0            
Unamortized Debt Financing Costs 2,500,000 3,000,000.0            
DBNY SPV Facility | Line of Credit | Unfunded Loan Commitment                
Debt Instrument [Line Items]                
Unfunded Commitment 120,000,000.0 200,000,000.0            
MS SPV Facility | Line of Credit                
Debt Instrument [Line Items]                
Aggregate Principal Committed 200,000,000.0 200,000,000.0   $ 200,000,000        
Outstanding Principal 133,400,000 25,000,000.0            
Unamortized Debt Financing Costs 1,800,000 2,200,000            
MS SPV Facility | Line of Credit | Unfunded Loan Commitment                
Debt Instrument [Line Items]                
Unfunded Commitment $ 66,600,000 $ 175,000,000.0