v3.26.3
Shareholder Report
12 Months Ended
Aug. 31, 2026
USD ($)
Holding
Shareholder Report [Line Items]  
Document Type N-CSR
Amendment Flag false
Registrant Name Federated Hermes Adviser Series
Entity Central Index Key 0001707560
Entity Investment Company Type N-1A
Document Period End Date Aug. 31, 2026
C000214509 [Member]  
Shareholder Report [Line Items]  
Fund Name Federated Hermes SDG Engagement High Yield Credit Fund
Class Name Class R6 Shares
Trading Symbol FHHRX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about the Federated Hermes SDG Engagement High Yield Credit Fund (the “Fund”) for the period of September 1, 2025 to August 31, 2026.
Shareholder Report Annual or Semi-Annual annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at FederatedHermes.com/FundInformation. You can also request this information by contacting us at 1‑800‑341‑7400, Option 4, or your financial advisor.
Additional Information Phone Number 1‑800‑341‑7400
Additional Information Website FederatedHermes.com/FundInformation
Expenses [Text Block]
What were the Fund costs for the last year?
(Based on a hypothetical $10,000 investment)
Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment
Class R6 Shares $57 0.56%
Expenses Paid, Amount $ 57
Expense Ratio, Percent 0.56%
Factors Affecting Performance [Text Block]
Management's Discussion of Fund Performance
The following discussion compares the performance of the Fund to the ICE BofA Global High Yield Constrained USD Hedged Index (the “Index”) to show how the Fund’s performance compares to the returns of similar investments for the reporting period. See the Average Annual Total Returns table below for the returns of the Fund and related indexes, including the Bloomberg Global Aggregate Index, a required broad-based index which represents the overall global investment-grade debt market. The Fund seeks to provide current income and long-term capital appreciation alongside positive societal impact.
Top Contributors to Performance
  • From a sector perspective, the Fund’s overweight positioning in the Basic Industry, Banking and Utility sectors were top contributors to its performance relative to the Index.
  • From an issuer perspective, the Fund’s lack of exposure to Optimum Comms (Media), along with an overweight allocation to Solenis (Basic Industry) and Orsted (Utilities) contributed the most to relative performance.
  • From a regional perspective, the Fund’s overweight allocations to Western Europe, the UK and the Pacific were primary contributors to relative Fund performance.
  • From a ratings perspective, the Fund’s overweight positioning in BBB-rated securities contributed the most to relative returns.
Top Detractors from Performance
  • From a sector perspective, the Fund’s underweight positioning in Energy, Financial Services and Leisure detracted the most from relative Fund performance.
  • From an issuer perspective, the Fund’s lack of exposure to Pemex (Energy) and EchoStar Corp (Telecommunications), along with an overweight allocation to Virgin Media (Telecoms) detracted the most from performance relative to the Index.
  • From a regional perspective, the Fund’s underweight allocation to North America, Latin America and Asia detracted the most from relative performance.
  • From a ratings perspective, the Fund’s underweight positioning in B-rated securities detracted the most from relative returns.
Performance Past Does Not Indicate Future [Text] Keep in mind that the Fund’s past performance is not a predictor of how the Fund will perform in the future.
Line Graph [Table Text Block]
Fund Performance
Keep in mind that the Fund’s past performance is not a predictor of how the Fund will perform in the future. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares.
Cumulative Performance: September 26, 2019 through August 31, 2026
Initial Investment of $10,000
Fund Performance - Growth of 10K
Average Annual Return [Table Text Block]
Average Annual Total Returns
1 Year 5 Years Since Inception
Class R6 Shares1 4.56% 3.32% 4.46%
Bloomberg Global Aggregate Index 0.60% -1.74% -0.28%
ICE BofA Global High Yield Constrained USD Hedged Index 5.15% 3.94% 4.75%
Lipper Global High Yield Funds Average 4.18% 3.38% 4.04%
1
The Fund’s Class R6 Shares commenced operations on June 11, 2021. For the periods prior to the commencement of operations of the Fund’s Class R6 Shares, the performance information shown is for the Fund’s Institutional Shares, which commenced operations on September 26, 2019. The performance of the Institutional Shares has not been adjusted to reflect the expenses of the Class R6 Shares, since the Class R6 Shares have a lower expense ratio than the Institutional Shares.
Performance Inception Date Jun. 11, 2021
No Deduction of Taxes [Text Block] The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares.
Material Change Date Jun. 30, 2026
Updated Performance Information Location [Text Block]
Visit FederatedHermes.com/FundInformation. and click on the link to your fund and share class for more recent performance information.
Net Assets $ 192,273,962
Holdings Count | Holding 303
Advisory Fees Paid, Amount $ 443,929
Investment Company Portfolio Turnover 23.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
Net Assets $192,273,962
Number of Investments 303
Portfolio Turnover 23%
Total Advisory Fees Paid $443,929
Holdings [Text Block]
Fund Holdings
Top Sectors
(% of Net Assets)
Graphical Representation - Allocation 1 Chart
Material Fund Change [Text Block]
Material Fund Changes
The following is a summary of material changes made to the Fund during the reporting period. For more complete and current information, you may review the Fund’s disclosure documents on its webpage at FederatedHermes.com/FundInformation or upon request at 1-800-341-7400, Option 4, or by contacting your financial advisor.
Effective June 30, 2026, the Fund’s non-fundamental 80% investment policy changed to the following: Under normal circumstances, the Fund will invest its assets so that at least 80% of its net assets (plus any borrowings for investment purposes) are invested in fixed-income investments rated below investment grade which, in the Adviser’s view, also provide the potential for contributing to positive societal impact aligned to the United Nations Sustainable Development Goals.
Material Fund Change Strategies [Text Block]
Effective June 30, 2026, the Fund’s non-fundamental 80% investment policy changed to the following: Under normal circumstances, the Fund will invest its assets so that at least 80% of its net assets (plus any borrowings for investment purposes) are invested in fixed-income investments rated below investment grade which, in the Adviser’s view, also provide the potential for contributing to positive societal impact aligned to the United Nations Sustainable Development Goals.
Summary of Change Legend [Text Block]
The following is a summary of material changes made to the Fund during the reporting period. For more complete and current information, you may review the Fund’s disclosure documents on its webpage at FederatedHermes.com/FundInformation or upon request at 1-800-341-7400, Option 4, or by contacting your financial advisor.
Updated Prospectus Phone Number 1-800-341-7400
Updated Prospectus Web Address FederatedHermes.com/FundInformation
C000214506 [Member]  
Shareholder Report [Line Items]  
Fund Name Federated Hermes SDG Engagement High Yield Credit Fund
Class Name Institutional Shares
Trading Symbol FHHIX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about the Federated Hermes SDG Engagement High Yield Credit Fund (the “Fund”) for the period of September 1, 2025 to August 31, 2026.
Shareholder Report Annual or Semi-Annual annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at FederatedHermes.com/FundInformation. You can also request this information by contacting us at 1‑800‑341‑7400, Option 4, or your financial advisor.
Additional Information Phone Number 1‑800‑341‑7400
Additional Information Website FederatedHermes.com/FundInformation
Expenses [Text Block]
What were the Fund costs for the last year?
(Based on a hypothetical $10,000 investment)
Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment
Institutional Shares $62 0.61%
Expenses Paid, Amount $ 62
Expense Ratio, Percent 0.61%
Factors Affecting Performance [Text Block]
Management's Discussion of Fund Performance
The following discussion compares the performance of the Fund to the ICE BofA Global High Yield Constrained USD Hedged Index (the “Index”) to show how the Fund’s performance compares to the returns of similar investments for the reporting period. See the Average Annual Total Returns table below for the returns of the Fund and related indexes, including the Bloomberg Global Aggregate Index, a required broad-based index which represents the overall global investment-grade debt market. The Fund seeks to provide current income and long-term capital appreciation alongside positive societal impact.
Top Contributors to Performance
  • From a sector perspective, the Fund’s overweight positioning in the Basic Industry, Banking and Utility sectors were top contributors to its performance relative to the Index.
  • From an issuer perspective, the Fund’s lack of exposure to Optimum Comms (Media), along with an overweight allocation to Solenis (Basic Industry) and Orsted (Utilities) contributed the most to relative performance.
  • From a regional perspective, the Fund’s overweight allocations to Western Europe, the UK and the Pacific were primary contributors to relative Fund performance.
  • From a ratings perspective, the Fund’s overweight positioning in BBB-rated securities contributed the most to relative returns.
Top Detractors from Performance
  • From a sector perspective, the Fund’s underweight positioning in Energy, Financial Services and Leisure detracted the most from relative Fund performance.
  • From an issuer perspective, the Fund’s lack of exposure to Pemex (Energy) and EchoStar Corp (Telecommunications), along with an overweight allocation to Virgin Media (Telecoms) detracted the most from performance relative to the Index.
  • From a regional perspective, the Fund’s underweight allocation to North America, Latin America and Asia detracted the most from relative performance.
  • From a ratings perspective, the Fund’s underweight positioning in B-rated securities detracted the most from relative returns.
Performance Past Does Not Indicate Future [Text] Keep in mind that the Fund’s past performance is not a predictor of how the Fund will perform in the future.
Line Graph [Table Text Block]
Fund Performance
Keep in mind that the Fund’s past performance is not a predictor of how the Fund will perform in the future. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares.
Cumulative Performance: September 26, 2019 through August 31, 2026
Initial Investment of $10,000
Fund Performance - Growth of 10K
Average Annual Return [Table Text Block]
Average Annual Total Returns
1 Year 5 Years Since Inception
Institutional Shares1 4.51% 3.26% 4.42%
Bloomberg Global Aggregate Index 0.60% -1.74% -0.28%
ICE BofA Global High Yield Constrained USD Hedged Index 5.15% 3.94% 4.75%
Lipper Global High Yield Funds Average 4.18% 3.38% 4.04%
1
Commenced operations on September 26, 2019.
Performance Inception Date Sep. 26, 2019
No Deduction of Taxes [Text Block] The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares.
Material Change Date Jun. 30, 2026
Updated Performance Information Location [Text Block]
Visit FederatedHermes.com/FundInformation. and click on the link to your fund and share class for more recent performance information.
Net Assets $ 192,273,962
Holdings Count | Holding 303
Advisory Fees Paid, Amount $ 443,929
Investment Company Portfolio Turnover 23.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
Net Assets $192,273,962
Number of Investments 303
Portfolio Turnover 23%
Total Advisory Fees Paid $443,929
Holdings [Text Block]
Fund Holdings
Top Sectors
(% of Net Assets)
Graphical Representation - Allocation 1 Chart
Material Fund Change [Text Block]
Material Fund Changes
The following is a summary of material changes made to the Fund during the reporting period. For more complete and current information, you may review the Fund’s disclosure documents on its webpage at FederatedHermes.com/FundInformation or upon request at 1-800-341-7400, Option 4, or by contacting your financial advisor.
Effective June 30, 2026, the Fund’s non-fundamental 80% investment policy changed to the following: Under normal circumstances, the Fund will invest its assets so that at least 80% of its net assets (plus any borrowings for investment purposes) are invested in fixed-income investments rated below investment grade which, in the Adviser’s view, also provide the potential for contributing to positive societal impact aligned to the United Nations Sustainable Development Goals.
Material Fund Change Strategies [Text Block]
Effective June 30, 2026, the Fund’s non-fundamental 80% investment policy changed to the following: Under normal circumstances, the Fund will invest its assets so that at least 80% of its net assets (plus any borrowings for investment purposes) are invested in fixed-income investments rated below investment grade which, in the Adviser’s view, also provide the potential for contributing to positive societal impact aligned to the United Nations Sustainable Development Goals.
Summary of Change Legend [Text Block]
The following is a summary of material changes made to the Fund during the reporting period. For more complete and current information, you may review the Fund’s disclosure documents on its webpage at FederatedHermes.com/FundInformation or upon request at 1-800-341-7400, Option 4, or by contacting your financial advisor.
Updated Prospectus Phone Number 1-800-341-7400
Updated Prospectus Web Address FederatedHermes.com/FundInformation