| Shareholder Report | 12 Months Ended | 120 Months Ended |
| Oct. 31, 2024 USD ($) Holding | Oct. 31, 2024 USD ($) 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 | Oct. 31, 2024 | |
| C000242831 | | |
| Shareholder Report [Line Items] | | |
| Fund Name | Hull Tactical US ETF | |
| Trading Symbol | HTUS | |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about Hull Tactical US ETF for the period of November 1, 2023 to October 31, 2024. | |
| Shareholder Report Annual or Semi-Annual | Annual Shareholder Report | |
| Additional Information [Text Block] | You can find additional information about the Fund at https://www.hulltacticalfunds.com/htus/documents/ | |
| Additional Information Phone Number | (844) 484-2484 | |
| Additional Information Website | https://www.hulltacticalfunds.com/htus/documents/ | |
| Expenses [Text Block] | What were the Fund’s costs for the last year? (based on a hypothetical $10,000 investment) Fund Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Hull Tactical US ETF $110 0.91% | |
| Expenses Paid, Amount | $ 110 | |
| Expense Ratio, Percent | 0.91% | |
| 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. | |
| Average Annual Return [Table Text Block] | Average Annual Total Returns 1 Year 5 years Since Inception (June 24, 2015) Hull Tactical US ETF - NAV 42.99% 15.26% 10.95% S&P 500 ® 38.02% 15.27% 13.26% The Fund's past performance is not a good predictor of how the Fund will perform in the future. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |
| Performance Inception Date | | Jun. 24, 2015 |
| 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. | |
| Material Change Date | Oct. 31, 2024 | |
| AssetsNet | $ 79,502,562 | $ 79,502,562 |
| Holdings Count | Holding | 26 | 26 |
| Advisory Fees Paid, Amount | $ 468,034 | |
| InvestmentCompanyPortfolioTurnover | 112% | |
| Additional Fund Statistics [Text Block] | Fund Statistics Net Assets $79,502,562 Number of Portfolio Holdings 26 Advisory Fee $468,034 Portfolio Turnover 112% | |
| Holdings [Text Block] | Asset Type Weighting (% of net assets) Value Value Other Assets in Excess of Liabilities 11.9% Purchased Options 0.1% U.S. Treasury Obligations 27.4% Exchange-Traded Funds 60.6% | |
