v3.25.3

Consolidated Schedule of Investments - Industry Classification | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Schedule Of Investments In percentage [Line Items] |  |
Percentage of Total Investments (at fair value) | 100.00% | 100.00%
Financial Services (includes SLR Credit Solutions, SLR Business Credit and SLR Healthcare ABL) [Member] |  |
Schedule Of Investments In percentage [Line Items] |  |
Percentage of Total Investments (at fair value) | 29.90% |
Diversified Financial Services (includes SLR Credit Solutions, SLR Business Credit and SLR Healthcare ABL) [Member] |  |
Schedule Of Investments In percentage [Line Items] |  |
Percentage of Total Investments (at fair value) |  | 27.70%
Multi-Sector Holdings (includes Kingsbridge Holdings, LLC and SLR Equipment Finance) [Member] |  |
Schedule Of Investments In percentage [Line Items] |  |
Percentage of Total Investments (at fair value) | 17.80% | 18.60%
Health Care Providers & Services [Member] |  |
Schedule Of Investments In percentage [Line Items] |  |
Percentage of Total Investments (at fair value) | 10.30% | 13.60%
Health Care Equipment & Supplies [Member] |  |
Schedule Of Investments In percentage [Line Items] |  |
Percentage of Total Investments (at fair value) | 5.50% | 6.80%
Capital Markets [Member] |  |
Schedule Of Investments In percentage [Line Items] |  |
Percentage of Total Investments (at fair value) | 5.00% | 3.20%
Pharmaceuticals [Member] |  |
Schedule Of Investments In percentage [Line Items] |  |
Percentage of Total Investments (at fair value) | 4.00% | 3.80%
Professional Services [Member] |  |
Schedule Of Investments In percentage [Line Items] |  |
Percentage of Total Investments (at fair value) | 3.80% |
Diversified Consumer Services [Member] |  |
Schedule Of Investments In percentage [Line Items] |  |
Percentage of Total Investments (at fair value) | 3.20% | 3.30%
Biotechnology [Member] |  |
Schedule Of Investments In percentage [Line Items] |  |
Percentage of Total Investments (at fair value) | 2.70% | 1.90%
Asset Management & Custody Banks [Member] |  |
Schedule Of Investments In percentage [Line Items] |  |
Percentage of Total Investments (at fair value) | 2.30% |
Transportation Infrastructure [Member] |  |
Schedule Of Investments In percentage [Line Items] |  |
Percentage of Total Investments (at fair value) | 2.10% | 0.60%
Consumer Staples Distribution & Retail [Member] |  |
Schedule Of Investments In percentage [Line Items] |  |
Percentage of Total Investments (at fair value) | 1.70% |
Commercial Services & Supplies [Member] |  |
Schedule Of Investments In percentage [Line Items] |  |
Percentage of Total Investments (at fair value) | 1.70% | 2.20%
Consumer Finance [Member] |  |
Schedule Of Investments In percentage [Line Items] |  |
Percentage of Total Investments (at fair value) | 1.50% |
Media [Member] |  |
Schedule Of Investments In percentage [Line Items] |  |
Percentage of Total Investments (at fair value) | 1.30% | 3.00%
Software [Member] |  |
Schedule Of Investments In percentage [Line Items] |  |
Percentage of Total Investments (at fair value) | 1.20% | 2.80%
Fertilizers & Agricultural Chemicals [Member] |  |
Schedule Of Investments In percentage [Line Items] |  |
Percentage of Total Investments (at fair value) | 1.00% |
Life Sciences Tools & Services [Member] |  |
Schedule Of Investments In percentage [Line Items] |  |
Percentage of Total Investments (at fair value) | 1.00% | 1.10%
Insurance [Member] |  |
Schedule Of Investments In percentage [Line Items] |  |
Percentage of Total Investments (at fair value) | 0.80% | 1.70%
Broadline Retail [Member] |  |
Schedule Of Investments In percentage [Line Items] |  |
Percentage of Total Investments (at fair value) | 0.60% |
Communications Equipment [Member] |  |
Schedule Of Investments In percentage [Line Items] |  |
Percentage of Total Investments (at fair value) | 0.50% | 0.70%
Specialty Retail [Member] |  |
Schedule Of Investments In percentage [Line Items] |  |
Percentage of Total Investments (at fair value) | 0.40% |
Health Care Technology [Member] |  |
Schedule Of Investments In percentage [Line Items] |  |
Percentage of Total Investments (at fair value) | 0.40% | 0.30%
Food Products [Member] |  |
Schedule Of Investments In percentage [Line Items] |  |
Percentage of Total Investments (at fair value) | 0.40% | 0.30%
Aerospace & Defense [Member] |  |
Schedule Of Investments In percentage [Line Items] |  |
Percentage of Total Investments (at fair value) | 0.30% | 0.20%
Trading Companies & Distributors [Member] |  |
Schedule Of Investments In percentage [Line Items] |  |
Percentage of Total Investments (at fair value) | 0.30% | 0.30%
Ground Transportation [Member] |  |
Schedule Of Investments In percentage [Line Items] |  |
Percentage of Total Investments (at fair value) | 0.20% |
Passenger Airlines [Member] |  |
Schedule Of Investments In percentage [Line Items] |  |
Percentage of Total Investments (at fair value) | 0.10% |
Metals & Mining [Member] |  |
Schedule Of Investments In percentage [Line Items] |  |
Percentage of Total Investments (at fair value) | 0.00% | 0.10%
Automobile Components [Member] |  |
Schedule Of Investments In percentage [Line Items] |  |
Percentage of Total Investments (at fair value) | 0.00% |
Construction & Engineering [Member] |  |
Schedule Of Investments In percentage [Line Items] |  |
Percentage of Total Investments (at fair value) | 0.00% | 0.10%
Machinery [Member] |  |
Schedule Of Investments In percentage [Line Items] |  |
Percentage of Total Investments (at fair value) |  | 0.10%
Hotels, Restaurants & Leisure [Member] |  |
Schedule Of Investments In percentage [Line Items] |  |
Percentage of Total Investments (at fair value) |  | 0.20%
Auto Components [Member] |  |
Schedule Of Investments In percentage [Line Items] |  |
Percentage of Total Investments (at fair value) |  | 0.10%
Asset Management [Member] |  |
Schedule Of Investments In percentage [Line Items] |  |
Percentage of Total Investments (at fair value) |  | 2.40%
Thrifts & Mortgage Finance [Member] |  |
Schedule Of Investments In percentage [Line Items] |  |
Percentage of Total Investments (at fair value) |  | 1.50%
Personal Products [Member] |  |
Schedule Of Investments In percentage [Line Items] |  |
Percentage of Total Investments (at fair value) |  | 1.20%
Internet Software & Services [Member] |  |
Schedule Of Investments In percentage [Line Items] |  |
Percentage of Total Investments (at fair value) |  | 1.00%
Internet & Catalog Retail [Member] |  |
Schedule Of Investments In percentage [Line Items] |  |
Percentage of Total Investments (at fair value) |  | 0.60%
Road & Rail [Member] |  |
Schedule Of Investments In percentage [Line Items] |  |
Percentage of Total Investments (at fair value) |  | 0.50%
Airlines [Member] |  |
Schedule Of Investments In percentage [Line Items] |  |
Percentage of Total Investments (at fair value) |  | 0.10%
Energy Equipment & Services [Member] |  |
Schedule Of Investments In percentage [Line Items] |  |
Percentage of Total Investments (at fair value) |  | 0.00%

X
- Definition Schedule of investments In percentage lineItems. + References No definition available. + Details
Name: | ck0001418076_ScheduleOfInvestmentsInPercentageLineItems
Namespace Prefix: | ck0001418076_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of investment owned to net assets. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 946 -SubTopic 210 -Name Accounting Standards Codification -Section 55 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147477439/946-210-55-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 210 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478795/946-210-50-6 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 210 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (a)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478795/946-210-50-6 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 210 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478795/946-210-50-1 Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 946 -SubTopic 210 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (a)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478795/946-210-50-6 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 320 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-12(Column C)(Footnote 5)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477271/946-320-S99-1 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 320 -Name Accounting Standards Codification -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-12B(Column D)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477271/946-320-S99-3 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 320 -Name Accounting Standards Codification -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-12B(Column C)(Footnote 2)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477271/946-320-S99-3 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 320 -Name Accounting Standards Codification -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-12B(Column A)(Footnote 6)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477271/946-320-S99-3 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 320 -Name Accounting Standards Codification -Section S99 -Paragraph 6 -Subparagraph (SX 210.12-14(Column F)(Footnote 7)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477271/946-320-S99-6 + Details
Name: | us-gaap_InvestmentOwnedPercentOfNetAssets
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_EquitySecuritiesByIndustryAxis=ck0001418076_FinancialServicesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_EquitySecuritiesByIndustryAxis=ck0001418076_DiversifiedFinancialServicesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_EquitySecuritiesByIndustryAxis=ck0001418076_MultiSectorHoldingsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_EquitySecuritiesByIndustryAxis=ck0001418076_HealthCareProvidersAndServicesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_EquitySecuritiesByIndustryAxis=ck0001418076_HealthCareEquipmentAndSuppliesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_EquitySecuritiesByIndustryAxis=ck0001418076_CapitalMarketsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_EquitySecuritiesByIndustryAxis=ck0001418076_PharmaceuticalsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_EquitySecuritiesByIndustryAxis=ck0001418076_ProfessionalServicesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_EquitySecuritiesByIndustryAxis=ck0001418076_DiversifiedConsumerServicesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_EquitySecuritiesByIndustryAxis=ck0001418076_BiotechnologyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_EquitySecuritiesByIndustryAxis=ck0001418076_AssetManagementAndCustodyBanksMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_EquitySecuritiesByIndustryAxis=ck0001418076_TransportationInfrastructureMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_EquitySecuritiesByIndustryAxis=ck0001418076_ConsumerStaplesDistributionAndRetailMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_EquitySecuritiesByIndustryAxis=ck0001418076_CommercialServicesAndSuppliesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_EquitySecuritiesByIndustryAxis=ck0001418076_ConsumerFinanceMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_EquitySecuritiesByIndustryAxis=ck0001418076_MediaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_EquitySecuritiesByIndustryAxis=ck0001418076_SoftwareMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_EquitySecuritiesByIndustryAxis=ck0001418076_FertilizersAgriculturalChemicalsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_EquitySecuritiesByIndustryAxis=ck0001418076_LifeSciencesToolsAndServicesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_EquitySecuritiesByIndustryAxis=ck0001418076_InsuranceMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_EquitySecuritiesByIndustryAxis=ck0001418076_BroadlineRetailMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_EquitySecuritiesByIndustryAxis=ck0001418076_CommunicationsEquipmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_EquitySecuritiesByIndustryAxis=ck0001418076_SpecialtyRetailMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_EquitySecuritiesByIndustryAxis=ck0001418076_HealthCareTechnologyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_EquitySecuritiesByIndustryAxis=ck0001418076_FoodProductsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_EquitySecuritiesByIndustryAxis=ck0001418076_AerospaceAndDefenseMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_EquitySecuritiesByIndustryAxis=ck0001418076_TradingCompaniesAndDistributorsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_EquitySecuritiesByIndustryAxis=ck0001418076_GroundTransportationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_EquitySecuritiesByIndustryAxis=ck0001418076_PassengerAirlinesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_EquitySecuritiesByIndustryAxis=ck0001418076_MetalsAndMiningMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_EquitySecuritiesByIndustryAxis=ck0001418076_AutomobileComponentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_EquitySecuritiesByIndustryAxis=ck0001418076_ConstructionAndEngineeringMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_EquitySecuritiesByIndustryAxis=ck0001418076_MachineryMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_EquitySecuritiesByIndustryAxis=ck0001418076_HotelsRestaurantsAndLeisureMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_EquitySecuritiesByIndustryAxis=ck0001418076_AutoComponentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_EquitySecuritiesByIndustryAxis=us-gaap_AssetManagement1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_EquitySecuritiesByIndustryAxis=ck0001418076_ThriftsAndMortgageFinanceMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_EquitySecuritiesByIndustryAxis=ck0001418076_PersonalProductsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_EquitySecuritiesByIndustryAxis=ck0001418076_InternetSoftwareAndServicesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_EquitySecuritiesByIndustryAxis=ck0001418076_InternetAndCatalogRetailMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_EquitySecuritiesByIndustryAxis=ck0001418076_RoadAndRailMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_EquitySecuritiesByIndustryAxis=ck0001418076_AirlinesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_EquitySecuritiesByIndustryAxis=ck0001418076_EnergyEquipmentAndServicesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |