Shareholder Report
Jan. 31, 2026
USD ($)
Holding
Shareholder Report |
6 Months Ended |
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Jan. 31, 2026
USD ($)
Holding
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| Shareholder Report [Line Items] | |
| Document Type | N-CSRS |
| Amendment Flag | false |
| Registrant Name | Federated Hermes MDT Series |
| Entity Central Index Key | 0001363526 |
| Entity Investment Company Type | N-1A |
| Document Period End Date | Jan. 31, 2026 |
| Shareholder Report Annual or Semi-Annual | Semi-Annual Shareholder Report |
| C000035043 | |
| Shareholder Report [Line Items] | |
| Fund Name | Federated Hermes MDT All Cap Core Fund |
| Class Name | Class A Shares |
| Trading Symbol | QAACX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about the Federated Hermes MDT All Cap Core Fund (the "Fund") for the period of August 1, 2025 to January 31, 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 | $ 55 |
| Expense Ratio, Percent | 1.05% |
| AssetsNet | $ 3,147,439,321 |
| Holdings Count | Holding | 176 |
| InvestmentCompanyPortfolioTurnover | 24.00% |
| Additional Fund Statistics [Text Block] | |
| Holdings [Text Block] | |
| Material Fund Change [Text Block] | |
| C000035044 | |
| Shareholder Report [Line Items] | |
| Fund Name | Federated Hermes MDT All Cap Core Fund |
| Class Name | Class C Shares |
| Trading Symbol | QCACX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about the Federated Hermes MDT All Cap Core Fund (the "Fund") for the period of August 1, 2025 to January 31, 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 | $ 94 |
| Expense Ratio, Percent | 1.80% |
| AssetsNet | $ 3,147,439,321 |
| Holdings Count | Holding | 176 |
| InvestmentCompanyPortfolioTurnover | 24.00% |
| Additional Fund Statistics [Text Block] | |
| Holdings [Text Block] | |
| Material Fund Change [Text Block] | |
| C000035045 | |
| Shareholder Report [Line Items] | |
| Fund Name | Federated Hermes MDT All Cap Core Fund |
| Class Name | Institutional Shares |
| Trading Symbol | QIACX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about the Federated Hermes MDT All Cap Core Fund (the "Fund") for the period of August 1, 2025 to January 31, 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 | $ 39 |
| Expense Ratio, Percent | 0.75% |
| AssetsNet | $ 3,147,439,321 |
| Holdings Count | Holding | 176 |
| InvestmentCompanyPortfolioTurnover | 24.00% |
| Additional Fund Statistics [Text Block] | |
| Holdings [Text Block] | |
| Material Fund Change [Text Block] | |
| C000043497 | |
| Shareholder Report [Line Items] | |
| Fund Name | Federated Hermes MDT All Cap Core Fund |
| Class Name | Class R6 Shares |
| Trading Symbol | QKACX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about the Federated Hermes MDT All Cap Core Fund (the "Fund") for the period of August 1, 2025 to January 31, 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 | $ 39 |
| Expense Ratio, Percent | 0.74% |
| AssetsNet | $ 3,147,439,321 |
| Holdings Count | Holding | 176 |
| InvestmentCompanyPortfolioTurnover | 24.00% |
| Additional Fund Statistics [Text Block] | |
| Holdings [Text Block] | |
| Material Fund Change [Text Block] | |
| C000035055 | |
| Shareholder Report [Line Items] | |
| Fund Name | Federated Hermes MDT Balanced Fund |
| Class Name | Class A Shares |
| Trading Symbol | QABGX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about the Federated Hermes MDT Balanced Fund (the "Fund") for the period of August 1, 2025 to January 31, 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 | $ 66 |
| Expense Ratio, Percent | 1.27% |
| AssetsNet | $ 317,258,450 |
| Holdings Count | Holding | 514 |
| InvestmentCompanyPortfolioTurnover | 24.00% |
| Additional Fund Statistics [Text Block] | |
| Holdings [Text Block] | |
| Material Fund Change [Text Block] | |
| C000035056 | |
| Shareholder Report [Line Items] | |
| Fund Name | Federated Hermes MDT Balanced Fund |
| Class Name | Class C Shares |
| Trading Symbol | QCBGX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about the Federated Hermes MDT Balanced Fund (the "Fund") for the period of August 1, 2025 to January 31, 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 | $ 106 |
| Expense Ratio, Percent | 2.05% |
| AssetsNet | $ 317,258,450 |
| Holdings Count | Holding | 514 |
| InvestmentCompanyPortfolioTurnover | 24.00% |
| Additional Fund Statistics [Text Block] | |
| Holdings [Text Block] | |
| Material Fund Change [Text Block] | |
| C000035057 | |
| Shareholder Report [Line Items] | |
| Fund Name | Federated Hermes MDT Balanced Fund |
| Class Name | Institutional Shares |
| Trading Symbol | QIBGX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about the Federated Hermes MDT Balanced Fund (the "Fund") for the period of August 1, 2025 to January 31, 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 | $ 54 |
| Expense Ratio, Percent | 1.04% |
| AssetsNet | $ 317,258,450 |
| Holdings Count | Holding | 514 |
| InvestmentCompanyPortfolioTurnover | 24.00% |
| Additional Fund Statistics [Text Block] | |
| Holdings [Text Block] | |
| Material Fund Change [Text Block] | |
| C000043498 | |
| Shareholder Report [Line Items] | |
| Fund Name | Federated Hermes MDT Balanced Fund |
| Class Name | Class R6 Shares |
| Trading Symbol | QKBGX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about the Federated Hermes MDT Balanced Fund (the "Fund") for the period of August 1, 2025 to January 31, 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 | $ 51 |
| Expense Ratio, Percent | 0.98% |
| AssetsNet | $ 317,258,450 |
| Holdings Count | Holding | 514 |
| InvestmentCompanyPortfolioTurnover | 24.00% |
| Additional Fund Statistics [Text Block] | |
| Holdings [Text Block] | |
| Material Fund Change [Text Block] | |
| C000035049 | |
| Shareholder Report [Line Items] | |
| Fund Name | Federated Hermes MDT Large Cap Growth Fund |
| Class Name | Class A Shares |
| Trading Symbol | QALGX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about the Federated Hermes MDT Large Cap Growth Fund (the "Fund") for the period of August 1, 2025 to January 31, 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 | $ 52 |
| Expense Ratio, Percent | 1.00% |
| AssetsNet | $ 4,544,374,515 |
| Holdings Count | Holding | 98 |
| InvestmentCompanyPortfolioTurnover | 21.00% |
| Additional Fund Statistics [Text Block] | |
| Holdings [Text Block] | |
| Material Fund Change [Text Block] | |
| C000035050 | |
| Shareholder Report [Line Items] | |
| Fund Name | Federated Hermes MDT Large Cap Growth Fund |
| Class Name | Class C Shares |
| Trading Symbol | QCLGX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about the Federated Hermes MDT Large Cap Growth Fund (the "Fund") for the period of August 1, 2025 to January 31, 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 | $ 91 |
| Expense Ratio, Percent | 1.77% |
| AssetsNet | $ 4,544,374,515 |
| Holdings Count | Holding | 98 |
| InvestmentCompanyPortfolioTurnover | 21.00% |
| Additional Fund Statistics [Text Block] | |
| Holdings [Text Block] | |
| Material Fund Change [Text Block] | |
| C000035051 | |
| Shareholder Report [Line Items] | |
| Fund Name | Federated Hermes MDT Large Cap Growth Fund |
| Class Name | Institutional Shares |
| Trading Symbol | QILGX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about the Federated Hermes MDT Large Cap Growth Fund (the "Fund") for the period of August 1, 2025 to January 31, 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 | $ 39 |
| Expense Ratio, Percent | 0.75% |
| AssetsNet | $ 4,544,374,515 |
| Holdings Count | Holding | 98 |
| InvestmentCompanyPortfolioTurnover | 21.00% |
| Additional Fund Statistics [Text Block] | |
| Holdings [Text Block] | |
| Material Fund Change [Text Block] | |
| C000250224 | |
| Shareholder Report [Line Items] | |
| Fund Name | Federated Hermes MDT Large Cap Growth Fund |
| Class Name | Class R6 Shares |
| Trading Symbol | QRLGX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about the Federated Hermes MDT Large Cap Growth Fund (the "Fund") for the period of August 1, 2025 to January 31, 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 | $ 37 |
| Expense Ratio, Percent | 0.72% |
| AssetsNet | $ 4,544,374,515 |
| Holdings Count | Holding | 98 |
| InvestmentCompanyPortfolioTurnover | 21.00% |
| Additional Fund Statistics [Text Block] | |
| Holdings [Text Block] | |
| Material Fund Change [Text Block] | |
| C000035058 | |
| Shareholder Report [Line Items] | |
| Fund Name | Federated Hermes MDT Small Cap Core Fund |
| Class Name | Class A Shares |
| Trading Symbol | QASCX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about the Federated Hermes MDT Small Cap Core Fund (the "Fund") for the period of August 1, 2025 to January 31, 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 | $ 63 |
| Expense Ratio, Percent | 1.14% |
| AssetsNet | $ 1,632,394,279 |
| Holdings Count | Holding | 303 |
| InvestmentCompanyPortfolioTurnover | 37.00% |
| Additional Fund Statistics [Text Block] | |
| Holdings [Text Block] | |
| Material Fund Change [Text Block] | |
| C000035059 | |
| Shareholder Report [Line Items] | |
| Fund Name | Federated Hermes MDT Small Cap Core Fund |
| Class Name | Class C Shares |
| Trading Symbol | QCSCX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about the Federated Hermes MDT Small Cap Core Fund (the "Fund") for the period of August 1, 2025 to January 31, 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 | $ 107 |
| Expense Ratio, Percent | 1.95% |
| AssetsNet | $ 1,632,394,279 |
| Holdings Count | Holding | 303 |
| InvestmentCompanyPortfolioTurnover | 37.00% |
| Additional Fund Statistics [Text Block] | |
| Holdings [Text Block] | |
| Material Fund Change [Text Block] | |
| C000035060 | |
| Shareholder Report [Line Items] | |
| Fund Name | Federated Hermes MDT Small Cap Core Fund |
| Class Name | Institutional Shares |
| Trading Symbol | QISCX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about the Federated Hermes MDT Small Cap Core Fund (the "Fund") for the period of August 1, 2025 to January 31, 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 | $ 49 |
| Expense Ratio, Percent | 0.89% |
| AssetsNet | $ 1,632,394,279 |
| Holdings Count | Holding | 303 |
| InvestmentCompanyPortfolioTurnover | 37.00% |
| Additional Fund Statistics [Text Block] | |
| Holdings [Text Block] | |
| Material Fund Change [Text Block] | |
| C000170839 | |
| Shareholder Report [Line Items] | |
| Fund Name | Federated Hermes MDT Small Cap Core Fund |
| Class Name | Class R6 Shares |
| Trading Symbol | QLSCX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about the Federated Hermes MDT Small Cap Core Fund (the "Fund") for the period of August 1, 2025 to January 31, 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 | $ 48 |
| Expense Ratio, Percent | 0.87% |
| AssetsNet | $ 1,632,394,279 |
| Holdings Count | Holding | 303 |
| InvestmentCompanyPortfolioTurnover | 37.00% |
| Additional Fund Statistics [Text Block] | |
| Holdings [Text Block] | |
| Material Fund Change [Text Block] | |
| C000035061 | |
| Shareholder Report [Line Items] | |
| Fund Name | Federated Hermes MDT Small Cap Growth Fund |
| Class Name | Class A Shares |
| Trading Symbol | QASGX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about the Federated Hermes MDT Small Cap Growth Fund (the "Fund") for the period of August 1, 2025 to January 31, 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 | $ 62 |
| Expense Ratio, Percent | 1.14% |
| AssetsNet | $ 649,726,435 |
| Holdings Count | Holding | 251 |
| InvestmentCompanyPortfolioTurnover | 35.00% |
| Additional Fund Statistics [Text Block] | |
| Holdings [Text Block] | |
| Material Fund Change [Text Block] | |
| C000035062 | |
| Shareholder Report [Line Items] | |
| Fund Name | Federated Hermes MDT Small Cap Growth Fund |
| Class Name | Class C Shares |
| Trading Symbol | QCSGX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about the Federated Hermes MDT Small Cap Growth Fund (the "Fund") for the period of August 1, 2025 to January 31, 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 | $ 107 |
| Expense Ratio, Percent | 1.96% |
| AssetsNet | $ 649,726,435 |
| Holdings Count | Holding | 251 |
| InvestmentCompanyPortfolioTurnover | 35.00% |
| Additional Fund Statistics [Text Block] | |
| Holdings [Text Block] | |
| Material Fund Change [Text Block] | |
| C000035063 | |
| Shareholder Report [Line Items] | |
| Fund Name | Federated Hermes MDT Small Cap Growth Fund |
| Class Name | Institutional Shares |
| Trading Symbol | QISGX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about the Federated Hermes MDT Small Cap Growth Fund (the "Fund") for the period of August 1, 2025 to January 31, 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 | $ 49 |
| Expense Ratio, Percent | 0.89% |
| AssetsNet | $ 649,726,435 |
| Holdings Count | Holding | 251 |
| InvestmentCompanyPortfolioTurnover | 35.00% |
| Additional Fund Statistics [Text Block] | |
| Holdings [Text Block] | |
| Material Fund Change [Text Block] | |
| C000170840 | |
| Shareholder Report [Line Items] | |
| Fund Name | Federated Hermes MDT Small Cap Growth Fund |
| Class Name | Class R6 Shares |
| Trading Symbol | QLSGX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about the Federated Hermes MDT Small Cap Growth Fund (the "Fund") for the period of August 1, 2025 to January 31, 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 | $ 48 |
| Expense Ratio, Percent | 0.88% |
| AssetsNet | $ 649,726,435 |
| Holdings Count | Holding | 251 |
| InvestmentCompanyPortfolioTurnover | 35.00% |
| Additional Fund Statistics [Text Block] | |
| Holdings [Text Block] | |
| Material Fund Change [Text Block] |
