| Form N-CSR Cover | 6 Months Ended |
| May 31, 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 | May 31, 2024 |
| Shareholder Report | 6 Months Ended |
| May 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 |
| Document Period End Date | May 31, 2024 |
| C000210640 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | Federated Hermes Global Equity Fund |
| Class Name | Institutional Shares |
| Trading Symbol | FHGIX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about the Federated Hermes Global Equity Fund (the “Fund”) for the period of December 1, 2023 to May 31, 2024. |
| 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 |
| 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 $ 0.73 % |
| Expenses Paid, Amount | $ 40 |
| Expense Ratio, Percent | 0.73% |
| Net Assets | $ 21,723,223 |
| Holdings Count | Holding | 94 |
| Investment Company Portfolio Turnover | 14% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics Net Assets $ % Number of Investments $ % Portfolio Turnover Rate $ % |
| Holdings [Text Block] | Fund Holdings Top Countries Top Sectors |
| C000210639 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | Federated Hermes Global Equity Fund |
| Class Name | Class R6 Shares |
| Trading Symbol | FGERX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about the Federated Hermes Global Equity Fund (the “Fund”) for the period of December 1, 2023 to May 31, 2024. |
| 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 |
| 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 $ 0.69 % |
| Expenses Paid, Amount | $ 37 |
| Expense Ratio, Percent | 0.69% |
| Net Assets | $ 21,723,223 |
| Holdings Count | Holding | 94 |
| Investment Company Portfolio Turnover | 14% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics Net Assets $ % Number of Investments $ % Portfolio Turnover Rate $ % |
| Holdings [Text Block] | Fund Holdings Top Countries Top Sectors |
| Shareholder Report, Holdings (Details) | May 31, 2024 |
| C000210640 [Member] | Energy Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.20% |
| C000210640 [Member] | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 14% |
| C000210640 [Member] | Real Estate Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.20% |
| C000210640 [Member] | Communications Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.30% |
| C000210640 [Member] | Consumer Discretionary Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.60% |
| C000210640 [Member] | Consumer Staples Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.30% |
| C000210640 [Member] | Industrial Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 11.80% |
| C000210640 [Member] | Information Technology Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 24.30% |
| C000210640 [Member] | Materials Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.70% |
| C000210640 [Member] | Utilities Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.50% |
| C000210640 [Member] | Financials [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 16.80% |
| C000210640 [Member] | DENMARK | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.20% |
| C000210640 [Member] | FRANCE | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.70% |
| C000210640 [Member] | UNITED KINGDOM | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.80% |
| C000210640 [Member] | INDIA | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2% |
| C000210640 [Member] | ITALY | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.10% |
| C000210640 [Member] | JAPAN | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.50% |
| C000210640 [Member] | KOREA, REPUBLIC OF | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2% |
| C000210640 [Member] | NETHERLANDS | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.20% |
| C000210640 [Member] | TAIWAN | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.90% |
| C000210640 [Member] | UNITED STATES | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 64.90% |
| C000210639 [Member] | Energy Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.20% |
| C000210639 [Member] | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 14% |
| C000210639 [Member] | Real Estate Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.20% |
| C000210639 [Member] | Communications Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.30% |
| C000210639 [Member] | Consumer Discretionary Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.60% |
| C000210639 [Member] | Consumer Staples Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.30% |
| C000210639 [Member] | Industrial Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 11.80% |
| C000210639 [Member] | Information Technology Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 24.30% |
| C000210639 [Member] | Materials Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.70% |
| C000210639 [Member] | Utilities Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.50% |
| C000210639 [Member] | Financials [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 16.80% |
| C000210639 [Member] | DENMARK | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.20% |
| C000210639 [Member] | FRANCE | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.70% |
| C000210639 [Member] | UNITED KINGDOM | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.80% |
| C000210639 [Member] | INDIA | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2% |
| C000210639 [Member] | ITALY | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.10% |
| C000210639 [Member] | JAPAN | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.50% |
| C000210639 [Member] | KOREA, REPUBLIC OF | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2% |
| C000210639 [Member] | NETHERLANDS | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.20% |
| C000210639 [Member] | TAIWAN | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.90% |
| C000210639 [Member] | UNITED STATES | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 64.90% |
