v3.26.1
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
Mar. 31, 2026
Sep. 30, 2025
Schedule Of Investments [Line Items]    
Cost $ 2,646,425 [1],[2],[3],[4] $ 2,819,393 [5],[6],[7],[8]
Fair Value $ 2,580,281 [1],[2],[3],[4],[9] $ 2,773,328 [5],[6],[7],[8],[10]
Net asset value Percentage 248.40% [1],[2],[3],[4] 258.10% [5],[6],[7],[8]
Aerospace and Defense    
Schedule Of Investments [Line Items]    
Cost [11] $ 205,014 $ 222,607
Fair Value [11] $ 251,979 $ 236,703
Fair Value Percentage [11] 12.00% 10.00%
Net asset value Percentage [11] 24.00% 22.00%
Professional Services    
Schedule Of Investments [Line Items]    
Cost [11] $ 221,792 $ 252,226
Fair Value [11] $ 219,229 $ 248,621
Fair Value Percentage [11] 10.00% 10.00%
Net asset value Percentage [11] 21.00% 23.00%
Media    
Schedule Of Investments [Line Items]    
Cost [11] $ 186,885 $ 169,182
Fair Value [11] $ 184,864 $ 169,013
Fair Value Percentage [11] 8.00% 7.00%
Net asset value Percentage [11] 18.00% 16.00%
Healthcare Providers and Services    
Schedule Of Investments [Line Items]    
Cost [11] $ 160,133 $ 195,695
Fair Value [11] $ 160,893 $ 199,549
Fair Value Percentage [11] 7.00% 8.00%
Net asset value Percentage [11] 15.00% 19.00%
Diversified Consumer Services    
Schedule Of Investments [Line Items]    
Cost [11] $ 132,306 $ 121,706
Fair Value [11] $ 133,846 $ 120,861
Fair Value Percentage [11] 6.00% 5.00%
Net asset value Percentage [11] 13.00% 11.00%
Business Services    
Schedule Of Investments [Line Items]    
Cost [11] $ 130,206 $ 171,987
Fair Value [11] $ 123,494 $ 169,086
Fair Value Percentage [11] 6.00% 7.00%
Net asset value Percentage [11] 12.00% 16.00%
IT Services    
Schedule Of Investments [Line Items]    
Cost [11] $ 105,340 $ 123,257
Fair Value [11] $ 103,905 $ 125,392
Fair Value Percentage [11] 5.00% 5.00%
Net asset value Percentage [11] 10.00% 12.00%
Personal Products    
Schedule Of Investments [Line Items]    
Cost [11] $ 102,180 $ 99,851
Fair Value [11] $ 93,547 $ 99,069
Fair Value Percentage [11] 4.00% 4.00%
Net asset value Percentage [11] 9.00% 9.00%
Distributors    
Schedule Of Investments [Line Items]    
Cost [11] $ 79,729 $ 84,194
Fair Value [11] $ 84,981 $ 88,795
Fair Value Percentage [11] 4.00% 4.00%
Net asset value Percentage [11] 8.00% 8.00%
All Other    
Schedule Of Investments [Line Items]    
Cost [11] $ 89,371 $ 112,159
Fair Value [11] $ 79,719 $ 102,794
Fair Value Percentage [11] 4.00% 3.00%
Net asset value Percentage [11] 9.00% 10.00%
Construction & Engineering    
Schedule Of Investments [Line Items]    
Cost [11] $ 74,366 $ 106,806
Fair Value [11] $ 78,455 $ 110,299
Fair Value Percentage [11] 4.00% 4.00%
Net asset value Percentage [11] 8.00% 10.00%
Healthcare Technology    
Schedule Of Investments [Line Items]    
Cost [11] $ 66,085 $ 103,230
Fair Value [11] $ 67,515 $ 105,500
Fair Value Percentage [11] 3.00% 4.00%
Net asset value Percentage [11] 7.00% 10.00%
Commercial Services & Supplies    
Schedule Of Investments [Line Items]    
Cost [11] $ 56,072 $ 70,373
Fair Value [11] $ 57,924 $ 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] $ 60,176 $ 97,385
Fair Value [11] $ 57,691 $ 95,499
Fair Value Percentage [11] 3.00% 4.00%
Net asset value Percentage [11] 6.00% 9.00%
Electronic Equipment, Instruments, and Components    
Schedule Of Investments [Line Items]    
Cost [11] $ 50,234 $ 43,733
Fair Value [11] $ 51,287 $ 44,241
Fair Value Percentage [11] 2.00% 2.00%
Net asset value Percentage [11] 5.00% 4.00%
Government Services    
Schedule Of Investments [Line Items]    
Cost [11] $ 45,155 $ 28,870
Fair Value [11] $ 46,483 $ 29,837
Fair Value Percentage [11] 2.00% 1.00%
Net asset value Percentage [11] 4.00% 3.00%
Auto Components    
Schedule Of Investments [Line Items]    
Cost [11] $ 44,038 $ 31,104
Fair Value [11] $ 44,733 $ 32,224
Fair Value Percentage [11] 2.00% 1.00%
Net asset value Percentage [11] 4.00% 3.00%
Automobiles [Member]    
Schedule Of Investments [Line Items]    
Cost [11] $ 41,550 $ 34,935
Fair Value [11] $ 40,511 $ 34,207
Fair Value Percentage [11] 2.00% 1.00%
Net asset value Percentage [11] 4.00% 3.00%
High Tech Industries    
Schedule Of Investments [Line Items]    
Cost [11] $ 23,440 $ 41,135
Fair Value [11] $ 35,724 $ 56,769
Fair Value Percentage [11] 2.00% 2.00%
Net asset value Percentage [11] 3.00% 5.00%
Healthcare, Education & Childcare    
Schedule Of Investments [Line Items]    
Cost [11] $ 27,648 $ 36,349
Fair Value [11] $ 27,841 $ 36,530
Fair Value Percentage [11] 1.00% 1.00%
Net asset value Percentage [11] 3.00% 3.00%
Consumer products    
Schedule Of Investments [Line Items]    
Cost [11] $ 29,777 $ 28,840
Fair Value [11] $ 25,730 $ 28,878
Fair Value Percentage [11] 1.00% 1.00%
Net asset value Percentage [11] 2.00% 3.00%
Manufacturing/Basic Industry[Member]    
Schedule Of Investments [Line Items]    
Cost [11] $ 24,740 $ 56,192
Fair Value [11] $ 24,701 $ 56,192
Fair Value Percentage [11] 1.00% 2.00%
Net asset value Percentage [11] 2.00% 5.00%
Internet Software and Services    
Schedule Of Investments [Line Items]    
Cost [11] $ 24,609 $ 39,660
Fair Value [11] $ 24,041 $ 40,012
Fair Value Percentage [11] 1.00% 2.00%
Net asset value Percentage [11] 2.00% 4.00%
Healthcare Equipment and Supplies    
Schedule Of Investments [Line Items]    
Cost [11] $ 19,625 $ 29,575
Fair Value [11] $ 21,690 $ 31,850
Fair Value Percentage [11] 1.00% 1.00%
Net asset value Percentage [11] 2.00% 3.00%
Marketing Services    
Schedule Of Investments [Line Items]    
Cost [11] $ 19,982 $ 19,307
Fair Value [11] $ 20,092 $ 19,365
Fair Value Percentage [11] 1.00% 1.00%
Net asset value Percentage [11] 2.00% 2.00%
Building Products    
Schedule Of Investments [Line Items]    
Cost [11] $ 20,471 $ 20,322
Fair Value [11] $ 19,510 $ 19,964
Fair Value Percentage [11] 1.00% 1.00%
Net asset value Percentage [11] 2.00% 2.00%
Gaming [Member]    
Schedule Of Investments [Line Items]    
Cost [11] $ 18,378 $ 14,852
Fair Value [11] $ 18,426 $ 14,974
Fair Value Percentage [11] 1.00% 1.00%
Net asset value Percentage [11] 2.00% 2.00%
Software    
Schedule Of Investments [Line Items]    
Cost [11] $ 17,672 $ 17,716
Fair Value [11] $ 15,708 $ 17,453
Fair Value Percentage [11] 1.00% 1.00%
Net asset value Percentage [11] 2.00% 2.00%
Independent Power and Renewable Electricity Producers    
Schedule Of Investments [Line Items]    
Cost [11] $ 14,148 $ 20,028
Fair Value [11] $ 15,315 $ 21,134
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] $ 14,783 $ 14,437
Fair Value [11] $ 14,825 $ 14,447
Fair Value Percentage [11] 1.00% 1.00%
Net asset value Percentage [11] 1.00% 1.00%
Air Freight and Logistics    
Schedule Of Investments [Line Items]    
Cost [11] $ 13,736 $ 14,122
Fair Value [11] $ 13,416 $ 13,785
Fair Value Percentage [11] 0.00% 1.00%
Net asset value Percentage [11] 1.00% 1.00%
Media: Diversified and Production    
Schedule Of Investments [Line Items]    
Cost [11] $ 8,756 $ 12,478
Fair Value [11] $ 7,337 $ 11,534
Fair Value Percentage [11] 0.00% 0.00%
Net asset value Percentage [11] 1.00% 1.00%
Food Products    
Schedule Of Investments [Line Items]    
Cost [11] $ 12,231 $ 12,681
Fair Value [11] $ 12,280 $ 12,602
Fair Value Percentage [11] 0.00% 1.00%
Net asset value Percentage [11] 1.00% 1.00%
Consumer Products [member]    
Schedule Of Investments [Line Items]    
Cost [11] $ 11,297 $ 11,024
Fair Value [11] $ 11,319 $ 11,121
Fair Value Percentage [11] 0.00% 0.00%
Net asset value Percentage [11] 1.00% 0.00%
Total    
Schedule Of Investments [Line Items]    
Cost [11] $ 2,151,925 $ 2,458,018
Fair Value [11] $ 2,189,011 $ 2,491,360
Fair Value Percentage [11] 100.00% 100.00%
Net asset value Percentage [11] 211.00% 232.00%
[1] All of our investments are not registered under the 1933 Act and have restrictions on resale.
[2] As of March 31, 2026, all investments were in U.S. companies and total cost, fair value, and percentage of Net Assets for the U.S companies were $2,646.4 million, $2,580.3 million, and 248.4%
[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).
[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