v3.26.1
Shareholder Report
12 Months Ended
Apr. 30, 2026
USD ($)
Holding
Shareholder Report [Line Items]  
Document Type N-CSR
Amendment Flag false
Registrant Name Capitol Series Trust
Entity Central Index Key 0001587551
Entity Investment Company Type N-1A
Document Period End Date Apr. 30, 2026
Shareholder Report Annual or Semi-Annual Annual Shareholder Report
C000167184  
Shareholder Report [Line Items]  
Class Name Institutional Shares
Trading Symbol CAPTX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about Canterbury Portfolio Thermostat Fund (the “Fund”) for the period of May 1, 2025 through April 30, 2026.
Additional Information [Text Block] You can find additional information about the Fund at https://www.canterburygroup.com/mutualfund. You can also request this information by contacting us at (844) 838-2121.
Additional Information Phone Number (844) 838-2121
Additional Information Website https://www.canterburygroup.com/mutualfund
Expenses [Text Block]

What were the Fund’s costs for the last year?

(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
$438
3.87%
Expenses Paid, Amount $ 438
Expense Ratio, Percent 3.87%
Performance Past Does Not Indicate Future [Text] The Fund’s past performance is not a good predictor of how the Fund will perform in the future.
Performance Inception Date Aug. 02, 2016
No Deduction of Taxes [Text Block] The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares.
AssetsNet $ 8,874,240
Holdings Count | Holding 19
Advisory Fees Paid, Amount $ 73,249
InvestmentCompanyPortfolioTurnover 59.00%
Additional Fund Statistics [Text Block]

Fund Statistics 

Table Summary
Net Assets
$8,874,240
Number of Portfolio Holdings
19
Advisory Fee
$73,249
Portfolio Turnover
59%
Holdings [Text Block]

Portfolio Composition (% of net assets)

Group By Sector Chart
Table Summary
Value
Value
Liabilities in Excess of Other Assets
-0.5%
Health Care
3.8%
Financials
4.5%
Consumer Discretionary
4.6%
Money Market Funds
5.1%
Energy
5.2%
Technology
12.9%
Industrials
14.9%
Exchange-Traded Funds
49.5%