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Investments - NMFC Senior Loan Program IV LLC (Details)
$ in Thousands
 7 Months Ended 9 Months Ended 11 Months Ended
Jul. 11, 2025
USD ($)
Jul. 10, 2025
USD ($)
Sep. 30, 2025
USD ($)
investment
Dec. 20, 2024
Mar. 27, 2024
Dec. 31, 2024
USD ($)
investment
Schedule of Investments [Line Items]            
Cost     $ 3,062,321 [1]     $ 3,101,924 [2]
Investments at fair value     2,943,619 [1]     3,091,024 [2]
SLP IV            
Schedule of Investments [Line Items]            
Cost     112,400      
SLP IV | Revolving Credit Facility | Line of Credit            
Schedule of Investments [Line Items]            
Maximum borrowing capacity $ 600,000 $ 370,000        
SLP IV | Revolving Credit Facility | Line Of Credit, Class A Advance            
Schedule of Investments [Line Items]            
Maximum borrowing capacity 530,000          
SLP IV | Revolving Credit Facility | Line Of Credit, Class B Advance            
Schedule of Investments [Line Items]            
Maximum borrowing capacity $ 70,000          
SLP IV | SkyKnight Alpha            
Schedule of Investments [Line Items]            
Cost     $ 30,600      
SLP IV            
Schedule of Investments [Line Items]            
Investment period     5 years      
Investment additional period     1 year      
Cost     $ 537,430     474,738
Investments at fair value     $ 525,343     $ 469,326
Number of investments on non-accrual | investment     0     0
SLP IV | Delayed Draw Term Loan (DDTL)            
Schedule of Investments [Line Items]            
Unfunded commitments principal amount     $ 2,908     $ 1,212
SLP IV | Revolving Credit Facility            
Schedule of Investments [Line Items]            
Credit facility     $ 380,737     $ 334,437
SLP IV | Revolving Credit Facility | Line of Credit            
Schedule of Investments [Line Items]            
Interest rate margin   1.50%   1.90% 1.70%  
SLP IV | Revolving Credit Facility | Line Of Credit, Class A Advance            
Schedule of Investments [Line Items]            
Interest rate margin 1.50%          
SLP IV | Revolving Credit Facility | Line Of Credit, Class B Advance            
Schedule of Investments [Line Items]            
Interest rate margin 4.75%          
[1] New Mountain Finance Corporation (the "Company") generally acquires its investments in private transactions exempt from registration under the Securities Act of 1933, as amended (the "Securities Act"). These investments are generally subject to certain limitations on resale, and may be deemed to be "restricted securities" under the Securities Act.
[2] New Mountain Finance Corporation (the "Company") generally acquires its investments in private transactions exempt from registration under the Securities Act of 1933, as amended (the "Securities Act"). These investments are generally subject to certain limitations on resale, and may be deemed to be "restricted securities" under the Securities Act.