| Shareholder Report | 12 Months Ended | 43 Months Ended |
| Aug. 31, 2024 USD ($) Holding | Aug. 31, 2024 USD ($) 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, 2024 | |
| C000224641 | | |
| Shareholder Report [Line Items] | | |
| Fund Name | Federated Hermes Conservative Microshort Fund | |
| Class Name | Institutional Shares | |
| Trading Symbol | FHCOX | |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the Federated Hermes Conservative Microshort Fund (the "Fund") for the period of September 1, 2023 to August 31, 2024. | |
| Shareholder Report Annual or Semi-Annual | Annual Shareholder Report | |
| Additional Information [Text Block] | You can find additional information at FederatedHermes.com/us/FundInformation | |
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. | |
| Additional Information Phone Number | 1-800-341-7400 | |
| Additional Information Website | <span style="text-decoration: underline solid rgb(0, 0, 0); box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left;">FederatedHermes.com/us/FundInformation</span></span>" id="sjs-B20"><span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left;"><span style="text-decoration: underline solid rgb(0, 0, 0); box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left;">FederatedHermes.com/us/FundInformation</span></span> | |
| 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 $18 0.17% | |
| Expenses Paid, Amount | $ 18 | |
| Expense Ratio, Percent | 0.17% | |
| Factors Affecting Performance [Text Block] | Management's Discussion of Fund Performance The following discussion compares the performance of the Fund to the ICE BofA 3-Month US Treasury Bill 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 US Aggregate Bond Index, which represents the overall U.S. fixed-income market. The Fund seeks to provide current income consistent with capital preservation while maintaining liquidity by investing primarily in a diversified portfolio of investment-grade securities. Top Contributors to Performance ■ Sector and Security Selection added 33 basis points of excess returns as both Asset-Backed Securities and Investment-Grade Corporate Securities outperformed Treasuries during the last fiscal year. ■ Duration Management added 10 basis points of excess returns as the portfolio duration was positioned longer than the Index in a period of declining interest rates over the reporting period. Top Detractors from Performance ■ There were no material detractors from relative Fund performance. | |
| Performance Past Does Not Indicate Future [Text] | Keep in mind that the Fund’s past performance is not a good predictor of how the Fund will perform in the future. | |
| Line Graph [Table Text Block] | Institutional Shares Bloomberg US Aggregate Bond Index ICE 3M US T-Bill Index 2/3/2021 $10,000 $10,000 $10,000 8/31/2021 $10,036 $10,029 $10,002 8/31/2022 $10,026 $8,874 $10,039 8/31/2023 $10,499 $8,769 $10,466 8/31/2024 $11,140 $9,408 $11,040 | |
| Average Annual Return [Table Text Block] | Fund/Index 1 Year Since
Inception
2/3/2021 Institutional Shares 6.11% 3.07% Bloomberg US Aggregate Bond Index Footnote Reference 7.30% (1.69%) ICE 3M US T-Bill Index 5.48% 2.81% | |
| Performance Inception Date | | Feb. 03, 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. | |
| Performance Table Market Index Changed [Text Block] | The Fund has designated the Bloomberg US Aggregate Bond Index as its new broad-based securities market index in accordance with the SEC’s revised definition for such an index. | |
| AssetsNet | $ 148,403,914 | $ 148,403,914 |
| Holdings Count | Holding | 57 | 57 |
| Advisory Fees Paid, Amount | $ 0 | |
| InvestmentCompanyPortfolioTurnover | 78% | |
| Additional Fund Statistics [Text Block] | Key Fund Statistics Net Assets $148,403,914 Number of Investments 57 Portfolio Turnover 78% Total Advisory Fees Paid $0 | |
| Holdings [Text Block] | Top Security Types (% of Net Assets) Value Value Collateralized Mortgage Obligations 2.0% Commercial Paper 3.4% Repurchase Agreements 14.3% Corporate Bonds 17.0% Other Repurchase Agreements 25.2% Asset-Backed Securities 39.1% | |
| Material Fund Change Strategies [Text Block] | During the reporting period, the Fund achieved its predetermined asset size scale to invest in securities directly and no longer seeks to implement its investment strategy through the investment of a considerable portion of its assets in an affiliated money market fund, as had previously been disclosed in the Fund’s Prospectus. Accordingly, effective October 29, 2024, such disclosure and related risk have been removed from the Fund’s Prospectus. | |
| 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/us/FundInformation | |
| C000224643 | | |
| Shareholder Report [Line Items] | | |
| Fund Name | Federated Hermes Conservative Municipal Microshort Fund | |
| Class Name | Institutional Shares | |
| Trading Symbol | FHMIX | |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the Federated Hermes Conservative Municipal Microshort Fund (the "Fund") for the period of September 1, 2023 to August 31, 2024. | |
| Shareholder Report Annual or Semi-Annual | Annual Shareholder Report | |
| Additional Information [Text Block] | You can find additional information at FederatedHermes.com/us/FundInformation | |
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. | |
| Additional Information Phone Number | 1-800-341-7400 | |
| Additional Information Website | <span style="text-decoration: underline solid rgb(0, 0, 0); box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left;">FederatedHermes.com/us/FundInformation</span></span>" id="sjs-B49"><span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left;"><span style="text-decoration: underline solid rgb(0, 0, 0); box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left;">FederatedHermes.com/us/FundInformation</span></span> | |
| 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 $25 0.25% | |
| Expenses Paid, Amount | $ 25 | |
| Expense Ratio, Percent | 0.25% | |
| Factors Affecting Performance [Text Block] | Management's Discussion of Fund Performance The following discussion compares the performance of the Fund to the Bloomberg BVAL Municipal Yield Curve (Callable) 3-Month 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 S&P Municipal Bond Index, which represents the overall U.S. municipal fixed-income market. The Fund seeks to provide current income consistent with preservation of capital with an emphasis on maintaining liquidity on a tax-exempt basis. Top Contributors to Performance ■ Credit quality contributed positively to relative performance with exposure to A-2-rated primarily variable-rate securities as well as AA-rated and A-rated fixed-rate securities or equivalent issuer ratings, all of which are excluded from the AAA-rated Index. ■ Yield curve allocations contributed positively to relative performance, specifically a strategy with a significant allocation to daily and weekly variable rate demand notes (VRDNs) for both liquidity and duration management, combined with tactical longer duration allocations to General Obligation-Local and Industrial Development/Pollution Control bonds/notes. The 7-day SIFMA Index rate, a proxy for weekly VRDNs, which fluctuated over a wide range, averaged 3.48% during the period. ■ The purchase of high-quality, longer than Index bond/note maturities (typically six to 12 months) during periods when short-term municipal market yields peaked contributed to relative performance. The one-year AAA-rated Bloomberg Evaluation Service municipal yield fluctuated over a wide range from 2.53% to 3.83%. Top Detractors from Performance ■ Duration management modestly detracted from relative performance. While the Fund ended the fiscal year with a dollar-weighted average maturity (WAM) of approximately 90 days, it held a short duration position relative to the Index during a majority of the period where, despite the Federal Reserve having left rates unchanged, the Index fluctuated over a wide range from 2.60% to 4.25% and ended the period at 2.65%. | |
| Performance Past Does Not Indicate Future [Text] | Keep in mind that the Fund’s past performance is not a good predictor of how the Fund will perform in the future. | |
| Line Graph [Table Text Block] | Institutional Shares S&P Municipal Bond Index Bloomberg BVAL Municipal Yield Curve (Callable) 3-Month Index 2/3/2021 $10,000 $10,000 $10,000 8/31/2021 $10,016 $10,106 $10,004 8/31/2022 $10,076 $9,289 $10,072 8/31/2023 $10,397 $9,456 $10,367 8/31/2024 $10,801 $10,047 $10,717 | |
| Average Annual Return [Table Text Block] | Fund/Index 1 Year Since
Inception
2/3/2021 Institutional Shares 3.89% 2.18% S&P Municipal Bond Index Footnote Reference 6.25% 0.13% Bloomberg BVAL Municipal Yield Curve (Callable) 3-Month Index 3.37% 1.96% | |
| Performance Inception Date | | Feb. 03, 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. | |
| Performance Table Market Index Changed [Text Block] | The Fund has designated the S&P Municipal Bond Index as its new broad-based securities market index in accordance with the SEC’s revised definition for such an index. | |
| AssetsNet | $ 239,398,860 | $ 239,398,860 |
| Holdings Count | Holding | 100 | 100 |
| Advisory Fees Paid, Amount | $ 101,514 | |
| InvestmentCompanyPortfolioTurnover | 39% | |
| Additional Fund Statistics [Text Block] | Key Fund Statistics Net Assets $239,398,860 Number of Investments 100 Portfolio Turnover 39% Total Advisory Fees Paid $101,514 | |
| Holdings [Text Block] | Top Sectors (% of Total Net Assets) Value Value Single Family Housing 0.2% Port 0.5% General Obligation- Local (Appropriation) 0.5% Higher Education 0.6% Hospital 1.5% Water & Sewer 1.7% Airport 4.4% Electric & Gas 7.2% Multi-Family Housing 19.1% Industrial Development/Pollution Control 21.9% General Obligation- Local 23.8% | |
| 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/us/FundInformation Effective November 28, 2023, the Fund’s investment strategy was changed to increase the Fund’s maximum permitted exposure to investments subject to the federal alternative minimum tax (AMT) for individuals from 20% to 40%. | |
| Material Fund Change Strategies [Text Block] | Effective November 28, 2023, the Fund’s investment strategy was changed to increase the Fund’s maximum permitted exposure to investments subject to the federal alternative minimum tax (AMT) for individuals from 20% to 40%. | |
| 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/us/FundInformation | |
