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Shareholder Report
 6 Months Ended
Nov. 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 Nov. 30, 2025
C000213941 [Member]  
Shareholder Report [Line Items]  
Fund Name Federated Hermes Emerging Markets Equity Fund
Class Name Class R6 Shares
Trading Symbol FRIEX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the Federated Hermes Emerging Markets Equity Fund (the “Fund”) for the period of June 1, 2025 to November 30, 2025.
Shareholder Report Annual or Semi-Annual semi-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 six months?
(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 $51 0.92%
Expenses Paid, Amount $ 51
Expense Ratio, Percent 0.92%
Net Assets $ 46,308,170
Holdings Count | Holding 48
Investment Company Portfolio Turnover 6.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
Net Assets $46,308,170
Number of Investments 48
Portfolio Turnover Rate 6%
Holdings [Text Block]
Fund Holdings
Top Countries
(% of Net Assets)
Graphical Representation - Allocation 1 Chart
Top Sectors
(% of Net Assets)
Graphical Representation - Allocation 2 Chart
C000213942 [Member]  
Shareholder Report [Line Items]  
Fund Name Federated Hermes Emerging Markets Equity Fund
Class Name Institutional Shares
Trading Symbol PIEFX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the Federated Hermes Emerging Markets Equity Fund (the “Fund”) for the period of June 1, 2025 to November 30, 2025.
Shareholder Report Annual or Semi-Annual semi-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 six months?
(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 $54 0.98%
Expenses Paid, Amount $ 54
Expense Ratio, Percent 0.98%
Net Assets $ 46,308,170
Holdings Count | Holding 48
Investment Company Portfolio Turnover 6.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
Net Assets $46,308,170
Number of Investments 48
Portfolio Turnover Rate 6%
Holdings [Text Block]
Fund Holdings
Top Countries
(% of Net Assets)
Graphical Representation - Allocation 1 Chart
Top Sectors
(% of Net Assets)
Graphical Representation - Allocation 2 Chart
C000213946 [Member]  
Shareholder Report [Line Items]  
Fund Name Federated Hermes International Equity Fund
Class Name Class A Shares
Trading Symbol PMIEX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the Federated Hermes International Equity Fund (the “Fund”) for the period of June 1, 2025 to November 30, 2025.
Shareholder Report Annual or Semi-Annual semi-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 six months?
(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 A Shares $41 0.78%
Expenses Paid, Amount $ 41
Expense Ratio, Percent 0.78%
Net Assets $ 271,202,244
Holdings Count | Holding 74
Investment Company Portfolio Turnover 38.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
Net Assets $271,202,244
Number of Investments 74
Portfolio Turnover Rate 38%
Holdings [Text Block]
Fund Holdings
Top Countries
(% of Net Assets) 1
Graphical Representation - Allocation 1 Chart
Top Sectors
(% of Net Assets) 1
Graphical Representation - Allocation 2 Chart
1  Reflects the pro rata portfolio composition of underlying affiliated investment companies (other than an affiliated money market mutual fund) in which the Fund invested greater than 10% of its net assets as of the date specified above. Accordingly, the percentages of net assets shown in the table will differ from those presented on the Portfolio of Investments.
C000213947 [Member]  
Shareholder Report [Line Items]  
Fund Name Federated Hermes International Equity Fund
Class Name Class C Shares
Trading Symbol PIUCX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the Federated Hermes International Equity Fund (the “Fund”) for the period of June 1, 2025 to November 30, 2025.
Shareholder Report Annual or Semi-Annual semi-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 six months?
(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 C Shares $82 1.57%
Expenses Paid, Amount $ 82
Expense Ratio, Percent 1.57%
Net Assets $ 271,202,244
Holdings Count | Holding 74
Investment Company Portfolio Turnover 38.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
Net Assets $271,202,244
Number of Investments 74
Portfolio Turnover Rate 38%
Holdings [Text Block]
Fund Holdings
Top Countries
(% of Net Assets) 1
Graphical Representation - Allocation 1 Chart
Top Sectors
(% of Net Assets) 1
Graphical Representation - Allocation 2 Chart
1  Reflects the pro rata portfolio composition of underlying affiliated investment companies (other than an affiliated money market mutual fund) in which the Fund invested greater than 10% of its net assets as of the date specified above. Accordingly, the percentages of net assets shown in the table will differ from those presented on the Portfolio of Investments.
C000213944 [Member]  
Shareholder Report [Line Items]  
Fund Name Federated Hermes International Equity Fund
Class Name Institutional Shares
Trading Symbol PIUIX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the Federated Hermes International Equity Fund (the “Fund”) for the period of June 1, 2025 to November 30, 2025.
Shareholder Report Annual or Semi-Annual semi-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 six months?
(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 $27 0.52%
Expenses Paid, Amount $ 27
Expense Ratio, Percent 0.52%
Net Assets $ 271,202,244
Holdings Count | Holding 74
Investment Company Portfolio Turnover 38.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
Net Assets $271,202,244
Number of Investments 74
Portfolio Turnover Rate 38%
Holdings [Text Block]
Fund Holdings
Top Countries
(% of Net Assets) 1
Graphical Representation - Allocation 1 Chart
Top Sectors
(% of Net Assets) 1
Graphical Representation - Allocation 2 Chart
1  Reflects the pro rata portfolio composition of underlying affiliated investment companies (other than an affiliated money market mutual fund) in which the Fund invested greater than 10% of its net assets as of the date specified above. Accordingly, the percentages of net assets shown in the table will differ from those presented on the Portfolio of Investments.
C000213945 [Member]  
Shareholder Report [Line Items]  
Fund Name Federated Hermes International Equity Fund
Class Name Class R6 Shares
Trading Symbol PEIRX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the Federated Hermes International Equity Fund (the “Fund”) for the period of June 1, 2025 to November 30, 2025.
Shareholder Report Annual or Semi-Annual semi-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 six months?
(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 $26 0.49%
Expenses Paid, Amount $ 26
Expense Ratio, Percent 0.49%
Net Assets $ 271,202,244
Holdings Count | Holding 74
Investment Company Portfolio Turnover 38.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
Net Assets $271,202,244
Number of Investments 74
Portfolio Turnover Rate 38%
Holdings [Text Block]
Fund Holdings
Top Countries
(% of Net Assets) 1
Graphical Representation - Allocation 1 Chart
Top Sectors
(% of Net Assets) 1
Graphical Representation - Allocation 2 Chart
1  Reflects the pro rata portfolio composition of underlying affiliated investment companies (other than an affiliated money market mutual fund) in which the Fund invested greater than 10% of its net assets as of the date specified above. Accordingly, the percentages of net assets shown in the table will differ from those presented on the Portfolio of Investments.
C000213950 [Member]  
Shareholder Report [Line Items]  
Fund Name Federated Hermes International Growth Fund
Class Name Class R6 Shares
Trading Symbol REIGX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the Federated Hermes International Growth Fund (the “Fund”) for the period of June 1, 2025 to November 30, 2025.
Shareholder Report Annual or Semi-Annual semi-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 six months?
(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 $43 0.83%
Expenses Paid, Amount $ 43
Expense Ratio, Percent 0.83%
Net Assets $ 176,631,005
Holdings Count | Holding 75
Investment Company Portfolio Turnover 14.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
Net Assets $176,631,005
Number of Investments 75
Portfolio Turnover Rate 14%
Holdings [Text Block]
Fund Holdings
Top Countries
(% of Net Assets)
Graphical Representation - Allocation 1 Chart
Top Sectors
(% of Net Assets)
Graphical Representation - Allocation 2 Chart
C000213949 [Member]  
Shareholder Report [Line Items]  
Fund Name Federated Hermes International Growth Fund
Class Name Institutional Shares
Trading Symbol PIGDX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the Federated Hermes International Growth Fund (the “Fund”) for the period of June 1, 2025 to November 30, 2025.
Shareholder Report Annual or Semi-Annual semi-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 six months?
(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 $43 0.84%
Expenses Paid, Amount $ 43
Expense Ratio, Percent 0.84%
Net Assets $ 176,631,005
Holdings Count | Holding 75
Investment Company Portfolio Turnover 14.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
Net Assets $176,631,005
Number of Investments 75
Portfolio Turnover Rate 14%
Holdings [Text Block]
Fund Holdings
Top Countries
(% of Net Assets)
Graphical Representation - Allocation 1 Chart
Top Sectors
(% of Net Assets)
Graphical Representation - Allocation 2 Chart