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Shareholder Report
 12 Months Ended
Jun. 30, 2025
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 Jun. 30, 2025
C000219574 [Member]  
Shareholder Report [Line Items]  
Fund Name Federated Hermes U.S. SMID Fund
Class Name Institutional Shares
Trading Symbol FHUMX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about the Federated Hermes U.S. SMID Fund (the “Fund”) for the period of July 1, 2024 to June 30, 2025.
Shareholder Report Annual or Semi-Annual annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at FederatedHermes.com/us/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/us/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 $86 0.83%
Expenses Paid, Amount $ 86
Expense Ratio, Percent 0.83%
Factors Affecting Performance [Text Block]
Management's Discussion of Fund Performance
The following discussion compares the performance of the Fund to the Russell 2500 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 Russell 3000 Index, which represents approximately 98% of investable U.S. equities by market capitalization. The Fund seeks to provide long-term capital appreciation by investing primarily in a diversified portfolio of equity and/or equity-related securities of small-cap and mid-cap companies.
Top Contributors to Performance
  • Stock selection in the Industrials, Real Estate and Materials sectors positively affected Fund relative performance.
  • By sector, underweight positions in Energy, Real Estate and Consumer Discretionary aided performance.
  • Top individual outperforming holdings included Axon Enterprise, Guidewire and Esco Technologie
Top Detractors from Performance
  • Stock selection in the Information Technology, Health Care and Financials sectors detracted the most from Fund relative performance.
  • By sector, underweight positions in Financials and Utilities, and zero-weight in Communication Services detracted from performance.
  • Top individual detracting holdings included Teradyne, Azenta and Trex.
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]
Fund Performance
Keep in mind that the Fund’s past performance is not a good 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: July 6, 2020 through June 30, 2025
Initial Investment of $10,000
Fund Performance - Growth of 10K
Average Annual Return [Table Text Block]
Average Annual Total Returns
1 Year Since Inception
Institutional Shares1 7.74% 12.46%
Russell 3000 Index 15.30% 15.76%
Russell 2500 Index 9.91% 11.49%
Morningstar US Mid-Cap Blend Funds Average 10.87% 13.02%
1
Commenced operations on July 6, 2020.
Performance Inception Date Jul. 06, 2020
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.
Updated Performance Information Location [Text Block]
Visit FederatedHermes.com/us/FundInformation and click on the link to your fund and share class for more recent performance information.
Net Assets $ 4,611,824
Holdings Count | Holding 50
Advisory Fees Paid, Amount $ 0
Investment Company Portfolio Turnover 22.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
Net Assets $4,611,824
Number of Investments 50
Portfolio Turnover Rate 22%
Total Advisory Fees Paid $0
Holdings [Text Block]
Fund Holdings
Top Sectors
(% of Net Assets)
Graphical Representation - Allocation 1 Chart