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Investments - Schedule of Investments by Industry Classification and Enumerates Percentage, by Fair Value, of Total Portfolio Assets Excluding Cash and Cash Equivalents (Details) - USD ($)
$ in Thousands
Dec. 31, 2025
Sep. 30, 2025
Schedule Of Investments [Line Items]    
Cost $ 2,683,700 [1],[2],[3],[4] $ 2,819,393 [5],[6],[7],[8]
Fair Value $ 2,605,347 [1],[2],[3],[4],[9] $ 2,773,328 [5],[6],[7],[8],[10]
Net asset value Percentage 250.40% [1],[2],[3],[4] 258.10% [5],[6],[7],[8]
Aerospace and Defense    
Schedule Of Investments [Line Items]    
Cost [11] $ 203,104 $ 222,607
Fair Value [11] $ 212,795 $ 236,703
Fair Value Percentage [11] 10.00% 10.00%
Net asset value Percentage [11] 21.00% 22.00%
Professional Services    
Schedule Of Investments [Line Items]    
Cost [11] $ 222,290 $ 252,226
Fair Value [11] $ 219,021 $ 248,621
Fair Value Percentage [11] 10.00% 10.00%
Net asset value Percentage [11] 21.00% 23.00%
Healthcare Providers and Services    
Schedule Of Investments [Line Items]    
Cost [11] $ 150,158 $ 195,695
Fair Value [11] $ 151,589 $ 199,549
Fair Value Percentage [11] 7.00% 8.00%
Net asset value Percentage [11] 15.00% 19.00%
Media    
Schedule Of Investments [Line Items]    
Cost [11] $ 177,221 $ 169,182
Fair Value [11] $ 176,321 $ 169,013
Fair Value Percentage [11] 8.00% 7.00%
Net asset value Percentage [11] 17.00% 16.00%
Diversified Consumer Services    
Schedule Of Investments [Line Items]    
Cost [11] $ 124,871 $ 121,706
Fair Value [11] $ 122,810 $ 120,861
Fair Value Percentage [11] 5.00% 5.00%
Net asset value Percentage [11] 12.00% 11.00%
Healthcare Technology    
Schedule Of Investments [Line Items]    
Cost [11] $ 88,972 $ 103,230
Fair Value [11] $ 91,481 $ 105,500
Fair Value Percentage [11] 4.00% 4.00%
Net asset value Percentage [11] 9.00% 10.00%
Personal Products    
Schedule Of Investments [Line Items]    
Cost [11] $ 102,259 $ 99,851
Fair Value [11] $ 98,606 $ 99,069
Fair Value Percentage [11] 4.00% 4.00%
Net asset value Percentage [11] 10.00% 9.00%
IT Services    
Schedule Of Investments [Line Items]    
Cost [11] $ 104,780 $ 123,257
Fair Value [11] $ 107,216 $ 125,392
Fair Value Percentage [11] 5.00% 5.00%
Net asset value Percentage [11] 10.00% 12.00%
Commercial Services & Supplies    
Schedule Of Investments [Line Items]    
Cost [11] $ 62,433 $ 70,373
Fair Value [11] $ 65,927 $ 73,060
Fair Value Percentage [11] 3.00% 3.00%
Net asset value Percentage [11] 6.00% 7.00%
Leisure Products    
Schedule Of Investments [Line Items]    
Cost [11] $ 57,965 $ 97,385
Fair Value [11] $ 56,422 $ 95,499
Fair Value Percentage [11] 3.00% 4.00%
Net asset value Percentage [11] 5.00% 9.00%
Business Services    
Schedule Of Investments [Line Items]    
Cost [11] $ 152,611 $ 171,987
Fair Value [11] $ 147,692 $ 169,086
Fair Value Percentage [11] 7.00% 7.00%
Net asset value Percentage [11] 14.00% 16.00%
Distributors    
Schedule Of Investments [Line Items]    
Cost [11] $ 88,616 $ 84,194
Fair Value [11] $ 94,571 $ 88,795
Fair Value Percentage [11] 4.00% 4.00%
Net asset value Percentage [11] 9.00% 8.00%
Construction & Engineering    
Schedule Of Investments [Line Items]    
Cost [11] $ 87,455 $ 106,806
Fair Value [11] $ 91,726 $ 110,299
Fair Value Percentage [11] 4.00% 4.00%
Net asset value Percentage [11] 9.00% 10.00%
High Tech Industries    
Schedule Of Investments [Line Items]    
Cost [11] $ 20,843 $ 41,135
Fair Value [11] $ 34,205 $ 56,769
Fair Value Percentage [11] 2.00% 2.00%
Net asset value Percentage [11] 3.00% 5.00%
Manufacturing/Basic Industry[Member]    
Schedule Of Investments [Line Items]    
Cost [11] $ 31,287 $ 56,192
Fair Value [11] $ 31,257 $ 56,192
Fair Value Percentage [11] 1.00% 2.00%
Net asset value Percentage [11] 3.00% 5.00%
Electronic Equipment, Instruments, and Components    
Schedule Of Investments [Line Items]    
Cost [11] $ 49,483 $ 43,733
Fair Value [11] $ 51,275 $ 44,241
Fair Value Percentage [11] 2.00% 2.00%
Net asset value Percentage [11] 5.00% 4.00%
Automobiles [Member]    
Schedule Of Investments [Line Items]    
Cost [11] $ 41,517 $ 34,935
Fair Value [11] $ 39,994 $ 34,207
Fair Value Percentage [11] 2.00% 1.00%
Net asset value Percentage [11] 4.00% 3.00%
Government Services    
Schedule Of Investments [Line Items]    
Cost [11] $ 61,335 $ 28,870
Fair Value [11] $ 62,370 $ 29,837
Fair Value Percentage [11] 3.00% 1.00%
Net asset value Percentage [11] 6.00% 3.00%
Auto Components    
Schedule Of Investments [Line Items]    
Cost [11] $ 30,493 $ 31,104
Fair Value [11] $ 30,674 $ 32,224
Fair Value Percentage [11] 1.00% 1.00%
Net asset value Percentage [11] 3.00% 3.00%
Independent Power and Renewable Electricity Producers    
Schedule Of Investments [Line Items]    
Cost [11] $ 14,172 $ 20,028
Fair Value [11] $ 15,345 $ 21,134
Fair Value Percentage [11] 1.00% 1.00%
Net asset value Percentage [11] 2.00% 2.00%
Healthcare, Education & Childcare    
Schedule Of Investments [Line Items]    
Cost [11] $ 27,976 $ 36,349
Fair Value [11] $ 28,093 $ 36,530
Fair Value Percentage [11] 1.00% 1.00%
Net asset value Percentage [11] 3.00% 3.00%
Healthcare Equipment and Supplies    
Schedule Of Investments [Line Items]    
Cost [11] $ 19,852 $ 29,575
Fair Value [11] $ 21,858 $ 31,850
Fair Value Percentage [11] 1.00% 1.00%
Net asset value Percentage [11] 2.00% 3.00%
Internet Software and Services    
Schedule Of Investments [Line Items]    
Cost [11] $ 34,478 $ 39,660
Fair Value [11] $ 34,193 $ 40,012
Fair Value Percentage [11] 2.00% 2.00%
Net asset value Percentage [11] 3.00% 4.00%
Consumer products    
Schedule Of Investments [Line Items]    
Cost [11] $ 29,502 $ 28,840
Fair Value [11] $ 27,911 $ 28,878
Fair Value Percentage [11] 1.00% 1.00%
Net asset value Percentage [11] 3.00% 3.00%
Building Products    
Schedule Of Investments [Line Items]    
Cost [11] $ 21,152 $ 20,322
Fair Value [11] $ 20,103 $ 19,964
Fair Value Percentage [11] 1.00% 1.00%
Net asset value Percentage [11] 2.00% 2.00%
Capital Equipment    
Schedule Of Investments [Line Items]    
Cost [11] $ 13,625 $ 13,571
Fair Value [11] $ 12,397 $ 15,106
Fair Value Percentage [11] 0.00% 1.00%
Net asset value Percentage [11] 1.00% 1.00%
Consulting Services [Member]    
Schedule Of Investments [Line Items]    
Cost [11] $ 12,737 $ 12,769
Fair Value [11] $ 12,728 $ 12,761
Fair Value Percentage [11] 0.00% 1.00%
Net asset value Percentage [11] 1.00% 1.00%
Food Products    
Schedule Of Investments [Line Items]    
Cost [11] $ 12,651 $ 12,681
Fair Value [11] $ 12,662 $ 12,602
Fair Value Percentage [11] 0.00% 1.00%
Net asset value Percentage [11] 1.00% 1.00%
Gaming [Member]    
Schedule Of Investments [Line Items]    
Cost [11] $ 14,854 $ 14,852
Fair Value [11] $ 15,066 $ 14,974
Fair Value Percentage [11] 1.00% 1.00%
Net asset value Percentage [11] 1.00% 2.00%
Software    
Schedule Of Investments [Line Items]    
Cost [11] $ 19,904 $ 17,716
Fair Value [11] $ 19,157 $ 17,453
Fair Value Percentage [11] 1.00% 1.00%
Net asset value Percentage [11] 2.00% 2.00%
Marketing Services    
Schedule Of Investments [Line Items]    
Cost [11] $ 14,326 $ 19,307
Fair Value [11] $ 14,406 $ 19,365
Fair Value Percentage [11] 1.00% 1.00%
Net asset value Percentage [11] 1.00% 2.00%
Metals and Mining    
Schedule Of Investments [Line Items]    
Cost [11] $ 14,440 $ 14,437
Fair Value [11] $ 14,447 $ 14,447
Fair Value Percentage [11] 1.00% 1.00%
Net asset value Percentage [11] 1.00% 1.00%
Media: Diversified and Production    
Schedule Of Investments [Line Items]    
Cost [11] $ 12,512 $ 12,478
Fair Value [11] $ 12,032 $ 11,534
Fair Value Percentage [11] 0.00% 0.00%
Net asset value Percentage [11] 1.00% 1.00%
Consumer Products [member]    
Schedule Of Investments [Line Items]    
Cost $ 11,453 $ 11,024 [11]
Fair Value $ 11,547 $ 11,121 [11]
Fair Value Percentage 0.00% 0.00% [11]
Net asset value Percentage 1.00% 1.00% [11]
Air Freight and Logistics    
Schedule Of Investments [Line Items]    
Cost [11] $ 14,059 $ 14,122
Fair Value [11] $ 13,674 $ 13,785
Fair Value Percentage [11] 1.00% 1.00%
Net asset value Percentage [11] 1.00% 1.00%
All Other    
Schedule Of Investments [Line Items]    
Cost [11] $ 81,318 $ 85,819
Fair Value [11] $ 67,204 $ 74,927
Fair Value Percentage [11] 3.00% 1.00%
Net asset value Percentage [11] 7.00% 7.00%
Total    
Schedule Of Investments [Line Items]    
Cost [11] $ 2,226,704 $ 2,458,018
Fair Value [11] $ 2,238,775 $ 2,491,360
Fair Value Percentage [11] 100.00% 100.00%
Net asset value Percentage [11] 215.00% 232.00%
[1] All of our investments are not registered under the 1933 Act and have restrictions on resale.
[2] As of December 31, 2025, all investments were in U.S. companies and total cost, fair value, and percentage of Net Assets for the U.S companies were $2,683.7 million, $2,605.3 million, and 250.4%
[3] The provisions of the 1940 Act classify investments based on the level of control that we maintain in a particular portfolio company. As defined in the 1940 Act, a company is generally presumed to be “non-controlled” when we own 25% or less of the portfolio company’s voting securities and “controlled” when we own more than 25% of the portfolio company’s voting securities.
[4] The provisions of the 1940 Act classify investments further based on the level of ownership that we maintain in a particular portfolio company. As defined in the 1940 Act, a company is generally deemed as “non-affiliated” when we own less than 5% of a portfolio company’s voting securities and “affiliated” when we own 5% or more of a portfolio company’s voting securities.
[5] All of our investments are not registered under the 1933 Act and have restrictions on resale.
[6] As of September 30, 2025, all investments were in U.S companies and total cost, fair value, and percentage of Net Assets for the U.S. companies were $2,819.4 million, $2,773.3 million, and 258.1%
[7] The provisions of the 1940 Act classify investments based on the level of control that we maintain in a particular portfolio company. As defined in the 1940 Act, a company is generally presumed to be “non-controlled” when we own 25% or less of the portfolio company’s voting securities and “controlled” when we own more than 25% of the portfolio company’s voting securities.
[8] The provisions of the 1940 Act classify investments further based on the level of ownership that we maintain in a particular portfolio company. As defined in the 1940 Act, a company is generally deemed as “non-affiliated” when we own less than 5% of a portfolio company’s voting securities and “affiliated” when we own 5% or more of a portfolio company’s voting securities.
[9] Valued based on our accounting policy (See Note 2). The value of all securities was determined using significant unobservable inputs (See Note 5).
[10] Valued based on our accounting policy (See Note 2). The value of all securities was determined using significant unobservable inputs (See Note 5).
[11] Excludes investments in PSSL and PSSL II