v3.26.1
Document and Entity Information - USD ($)
 9 Months Ended
Dec. 31, 2025
Mar. 18, 2026
Cover [Abstract]    
Document Type 10-K  
Amendment Flag false  
Document Annual Report true  
Current Fiscal Year End Date --12-31  
Document Fiscal Year Focus 2025  
Document Fiscal Period Focus FY  
Entity Central Index Key 0002065397  
Document Period End Date Dec. 31, 2025  
Document Transition Report false  
Securities Act File Number 814-01700  
Entity Registrant Name ANTARES STRATEGIC CREDIT FUND II LLC  
Entity Incorporation, State or Country Code DE  
Entity Address, Address Line One 320 South Canal Street  
Entity Address, Address Line Two Suite 4200  
Entity Address, City or Town Chicago  
Entity Address, State or Province IL  
Entity Tax Identification Number 93-3416650  
Entity Address, Postal Zip Code 60606  
City Area Code 312  
Local Phone Number 638-4119  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Non-accelerated Filer  
Entity Emerging Growth Company true  
Entity Ex Transition Period false  
Entity Small Business false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   2,971,813
Entity Public Float $ 0  
Entity Well-known Seasoned Issuer No  
Entity Voluntary Filers No  
Document Financial Statement Error Correction [Flag] false  
ICFR Auditor Attestation Flag false  
Auditor Firm ID 34  
Auditor Location New York, New York  
Auditor Name Deloitte & Touche LLP  
Auditor Opinion [Text Block]

Opinion on the Financial Statements

We have audited the accompanying consolidated statement of assets and liabilities of Antares Strategic Credit Fund II LLC (the "Company"), including the consolidated schedule of investments, as of December 31, 2025, the related consolidated statements of operations, cash flows, and changes in net assets for the period from April 15, 2025 (inception) to December 31, 2025, and the related notes (collectively referred to as the “financial statements”). In our opinion, the financial statements present fairly, in all material respects, the financial position of the Company as of December 31, 2025, and the results of its operations, cash flows, and changes in net assets, for the period from April 15, 2025 (inception) to December 31, 2025, in conformity with accounting principles generally accepted in the United States of America.

Basis for Opinion

These financial statements are the responsibility of the Company's management. Our responsibility is to express an opinion on the Company's financial statements based on our audits. We are a public accounting firm registered with the Public Company Accounting Oversight Board (United States) (PCAOB) and are required to be independent with respect to the Company in accordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and Exchange Commission and the PCAOB.

We conducted our audit in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements are free of material misstatement, whether due to error or fraud. The Company is not required to have, nor were we engaged to perform, an audit of its internal control over financial reporting. As part of our audit, we are required to obtain an understanding of internal control over financial reporting but not for the purpose of expressing an opinion on the effectiveness of the Company’s internal control over financial reporting. Accordingly, we express no such opinion.

Our audit included performing procedures to assess the risks of material misstatement of the financial statements, whether due to error or fraud, and performing procedures that respond to those risks. Such procedures included examining, on a test basis, evidence regarding the amounts and disclosures in the financial statements. Our audit also included evaluating the accounting principles used and significant estimates made by management, as well as evaluating the overall presentation of the financial statements. We believe that our audit provides a reasonable basis for our opinion.