Shareholder Report |
6 Months Ended |
|---|---|
|
Apr. 30, 2026
USD ($)
Holding
| |
| Shareholder Report [Line Items] | |
| Document Type | N-CSRS |
| Amendment Flag | false |
| Registrant Name | Federated Hermes Institutional Trust |
| Entity Central Index Key | 0000925723 |
| Entity Investment Company Type | N-1A |
| Document Period End Date | Apr. 30, 2026 |
| Shareholder Report Annual or Semi-Annual | Semi-Annual Shareholder Report |
| C000240309 | |
| Shareholder Report [Line Items] | |
| Fund Name | Federated Hermes Institutional High Yield Bond Fund |
| Class Name | Class A Shares |
| Trading Symbol | FIHAX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about the Federated Hermes Institutional High Yield Bond Fund (the "Fund") for the period of November 1, 2025 to April 30, 2026. |
| Additional Information [Text Block] | You can find additional information 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] | |
| Expenses Paid, Amount | $ 38 |
| Expense Ratio, Percent | 0.75% |
| AssetsNet | $ 4,835,838,533 |
| Holdings Count | Holding | 457 |
| InvestmentCompanyPortfolioTurnover | 10.00% |
| Additional Fund Statistics [Text Block] | |
| Holdings [Text Block] | |
| Material Fund Change [Text Block] | |
| C000240310 | |
| Shareholder Report [Line Items] | |
| Fund Name | Federated Hermes Institutional High Yield Bond Fund |
| Class Name | Class C Shares |
| Trading Symbol | FIHCX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about the Federated Hermes Institutional High Yield Bond Fund (the "Fund") for the period of November 1, 2025 to April 30, 2026. |
| Additional Information [Text Block] | You can find additional information 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] | |
| Expenses Paid, Amount | $ 76 |
| Expense Ratio, Percent | 1.52% |
| AssetsNet | $ 4,835,838,533 |
| Holdings Count | Holding | 457 |
| InvestmentCompanyPortfolioTurnover | 10.00% |
| Additional Fund Statistics [Text Block] | |
| Holdings [Text Block] | |
| Material Fund Change [Text Block] | |
| C000030278 | |
| Shareholder Report [Line Items] | |
| Fund Name | Federated Hermes Institutional High Yield Bond Fund |
| Class Name | Institutional Shares |
| Trading Symbol | FIHBX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about the Federated Hermes Institutional High Yield Bond Fund (the "Fund") for the period of November 1, 2025 to April 30, 2026. |
| Additional Information [Text Block] | You can find additional information 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] | |
| Expenses Paid, Amount | $ 25 |
| Expense Ratio, Percent | 0.50% |
| AssetsNet | $ 4,835,838,533 |
| Holdings Count | Holding | 457 |
| InvestmentCompanyPortfolioTurnover | 10.00% |
| Additional Fund Statistics [Text Block] | |
| Holdings [Text Block] | |
| Material Fund Change [Text Block] | |
| C000170849 | |
| Shareholder Report [Line Items] | |
| Fund Name | Federated Hermes Institutional High Yield Bond Fund |
| Class Name | Class R6 Shares |
| Trading Symbol | FIHLX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about the Federated Hermes Institutional High Yield Bond Fund (the "Fund") for the period of November 1, 2025 to April 30, 2026. |
| Additional Information [Text Block] | You can find additional information 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] | |
| Expenses Paid, Amount | $ 25 |
| Expense Ratio, Percent | 0.49% |
| AssetsNet | $ 4,835,838,533 |
| Holdings Count | Holding | 457 |
| InvestmentCompanyPortfolioTurnover | 10.00% |
| Additional Fund Statistics [Text Block] | |
| Holdings [Text Block] | |
| Material Fund Change [Text Block] |