Federated Adviser Series N-CSR26 Aug 24Certified annual shareholder report (management investment company)Financial data

Company Profile

Form N-CSR Cover

Form N-CSR Cover	12 Months Ended
Form N-CSR Cover	Jun. 30, 2024
Shareholder Report [Line Items]
Document Type	N-CSR
Amendment Flag	false
Registrant Name	Federated Hermes Adviser Series
Entity Central Index Key	0001707560
Document Period End Date	Jun. 30, 2024

Shareholder Report

Shareholder Report	12 Months Ended
Shareholder Report	Jun. 30, 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
Document Period End Date	Jun. 30, 2024
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, 2023 to June 30, 2024.
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
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	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 $ 0.83 %
Expenses Paid, Amount	$ 87
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 96% 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 Financials and Technology sectors positively affected Fund relative performance. By sector, overweight position in Industrials and zero-weight in Telecommunications aided performance. Top individual outperforming holdings included Axon Enterprise, Fair Isaac and Reinsurance Group of America. Top Detractors from Performance Stock selection in the Health Care sector detracted the most from Fund relative performance. By sector, cash allocation detracted from performance. Top individual detracting holdings included AMN Healthcare, Bio-Rad Laboratories and LKQ.
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, 2024 Initial Investment of $10,000
Average Annual Return [Table Text Block]	Average Annual Total Returns 1 Year Since Inception Institutional Shares 1 10.07 % 13.67 % Russell 3000 Index 23.13 % 15.48 % Russell 2500 Index 10.47 % 11.67 % Morningstar US Mid-Cap Blend Funds Average 13.14 % 13.32 % 1 Commenced operations on July 6, 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
Net Assets	$ 4,432,770
Holdings Count \| Holding	53
Advisory Fees Paid, Amount	$ 0
Investment Company Portfolio Turnover	24%
Additional Fund Statistics [Text Block]	Key Fund Statistics Net Assets $ % Number of Investments $ % Portfolio Turnover Rate $ % Total Advisory Fees Paid $ %
Holdings [Text Block]	Fund Holdings Top Sectors
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 May 1, 2024, Alex Knox no longer serves as a portfolio manager of the Fund. Portfolio Managers Mark Sherlock, Henry Biddle and Michael Russell continue to manage the Fund.
Updated Prospectus Phone Number	1-800-341-7400
Updated Prospectus Web Address	FederatedHermes.com/us/FundInformation

Shareholder Report, Line Graph

Shareholder Report, Line Graph (Details) - USD ($)		12 Months Ended	48 Months Ended
Shareholder Report, Line Graph (Details) - USD ($)		Jun. 30, 2024	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2021	Jul. 06, 2020
C000219574 [Member]
Account Value [Line Items]
Line Graph and Table Measure Name		Institutional Shares
Account Value		$ 16,685	$ 16,685	$ 15,159	$ 12,287	$ 14,725	$ 10,000
Average Annual Return, Percent	[1]	10.07%	13.67%
Russell 3000 Index [Member]
Account Value [Line Items]
Line Graph and Table Measure Name		Russell 3000 Index
Account Value		$ 17,740	$ 17,740	14,408	12,112	14,062	10,000
Average Annual Return, Percent		23.13%	15.48%
Russell 2500 Index [Member]
Account Value [Line Items]
Line Graph and Table Measure Name		Russell 2500 Index
Account Value		$ 15,521	$ 15,521	14,050	12,370	15,658	10,000
Average Annual Return, Percent		10.47%	11.67%
Morningstar US Mid Cap Blend Funds Average [Member]
Account Value [Line Items]
Line Graph and Table Measure Name		Morningstar US Mid-Cap Blend Funds Average
Account Value		$ 16,486	$ 16,486	$ 14,570	$ 12,769	$ 14,854	$ 10,000
Average Annual Return, Percent		13.14%	13.32%

[1]Commenced operations on July 6, 2020.

Shareholder Report, Holdings (D

Shareholder Report, Holdings (Details) - C000219574 [Member]	Jun. 30, 2024
Utilities Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.30%
Real Estate Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.10%
Financials [Member]
Holdings [Line Items]
Percent of Net Asset Value	14.20%
Information Technology Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	26.60%
Industrial Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	25.90%
Materials Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	8.20%
Consumer Discretionary Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	7.50%
Health Care [Member]
Holdings [Line Items]
Percent of Net Asset Value	12.40%
Energy Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.50%