v3.26.1
Shareholder Report
 6 Months Ended
Feb. 28, 2026
USD ($)
Holding
Shareholder Report [Line Items]  
Document Type N-CSR
Amendment Flag false
Registrant Name Federated Hermes Adjustable Rate Securities Trust
Entity Central Index Key 0000771524
Entity Investment Company Type N-1A
Document Period End Date Feb. 28, 2026
Shareholder Report Annual or Semi-Annual Semi-Annual Shareholder Report
C000215087  
Shareholder Report [Line Items]  
Fund Name Federated Hermes Adjustable Rate Fund
Class Name Institutional Shares
Trading Symbol FEUNX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the Federated Hermes Adjustable Rate Fund (the "Fund") for the period of September 1, 2025 to February 28, 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]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Table Summary
Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Institutional Shares
$16
0.31%
Expenses Paid, Amount $ 16
Expense Ratio, Percent 0.31%
AssetsNet $ 391,071,286
Holdings Count | Holding 216
InvestmentCompanyPortfolioTurnover 14.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

  • Net Assets$391,071,286
  • Number of Investments216
  • Portfolio Turnover14%
  • Portfolio Turnover (excluding purchases and sales from dollar-roll transactions)12%
Holdings [Text Block]

Top Security Types (% of Net Assets)

Group By Sector Chart
Table Summary
Value
Value
U.S. Government Agency Adjustable Rate Mortgage Securities
0.9%
U.S. Treasury Securities
1.8%
U.S. Government Agency Commercial Mortgage-Backed Securities
3.8%
Cash Equivalents
3.9%
U.S. Government Agency Mortgage-Backed Securities
8.1%
Collateralized Mortgage Obligations
83.0%
Material Fund Change [Text Block]
C000024691  
Shareholder Report [Line Items]  
Fund Name Federated Hermes Adjustable Rate Fund
Class Name Class A Shares
Trading Symbol FEUGX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the Federated Hermes Adjustable Rate Fund (the "Fund") for the period of September 1, 2025 to February 28, 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]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Table Summary
Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class A Shares
$28
0.56%
Expenses Paid, Amount $ 28
Expense Ratio, Percent 0.56%
AssetsNet $ 391,071,286
Holdings Count | Holding 216
InvestmentCompanyPortfolioTurnover 14.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

  • Net Assets$391,071,286
  • Number of Investments216
  • Portfolio Turnover14%
  • Portfolio Turnover (excluding purchases and sales from dollar-roll transactions)12%
Holdings [Text Block]

Top Security Types (% of Net Assets)

Group By Sector Chart
Table Summary
Value
Value
U.S. Government Agency Adjustable Rate Mortgage Securities
0.9%
U.S. Treasury Securities
1.8%
U.S. Government Agency Commercial Mortgage-Backed Securities
3.8%
Cash Equivalents
3.9%
U.S. Government Agency Mortgage-Backed Securities
8.1%
Collateralized Mortgage Obligations
83.0%
Material Fund Change [Text Block]