Shareholder Report |
6 Months Ended | |||||||||
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Jun. 30, 2026
USD ($)
Holding
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| Shareholder Report [Line Items] | ||||||||||
| Document Type | N-CSR | |||||||||
| Amendment Flag | false | |||||||||
| Registrant Name | Baillie Gifford Institutional Trust | |||||||||
| Entity Central Index Key | 0002087828 | |||||||||
| Entity Investment Company Type | N-1A | |||||||||
| Document Period End Date | Jun. 30, 2026 | |||||||||
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report | |||||||||
| C000269504 | ||||||||||
| Shareholder Report [Line Items] | ||||||||||
| Fund Name | Baillie Gifford Institutional Long Term Global Growth Fund | |||||||||
| Class Name | Class 2 | |||||||||
| No Trading Symbol [Flag] | true | |||||||||
| Annual or Semi-Annual Statement [Text Block] | The semi-annual shareholder report contains important information about Baillie Gifford Institutional Long Term Global Growth Fund (the "Fund") for the period of February 5, 2026 (commencement of operations) to June 30, 2026. | |||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at www.bailliegifford.com/ltgg/TSR. You can also request this information by contacting us at +1-844-394-6127 or via email at northamericanvehiclesteam@bailliegifford.com. | |||||||||
| Additional Information Phone Number | +1-844-394-6127 | |||||||||
| Additional Information Website | www.bailliegifford.com/ltgg/TSR | |||||||||
| Expenses [Text Block] | What were the Fund costs for the last six months?(based on a hypothetical $10,000 investment) |
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| Expenses Paid, Amount | $ 29 | [1] | ||||||||
| Expense Ratio, Percent | 0.70% | [2] | ||||||||
| AssetsNet | $ 138,236,652 | |||||||||
| Holdings Count | Holding | 38 | |||||||||
| Advisory Fees Paid, Amount | $ 210,944 | |||||||||
| InvestmentCompanyPortfolioTurnover | 19.00% | |||||||||
| Additional Fund Statistics [Text Block] | Key Fund Statistics as of June 30, 2026The following table outlines key Fund statistics that you should pay attention to:
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| Additional Fund Statistics Significance or Limits [Text Block] | The following table outlines key Fund statistics that you should pay attention to: |
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| Holdings [Text Block] | Tabular Representation of Holdings as of June 30, 2026The following table shows the industry sector allocation of the Fund. |
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| C000269505 | ||||||||||
| Shareholder Report [Line Items] | ||||||||||
| Fund Name | Baillie Gifford Institutional Long Term Global Growth Fund | |||||||||
| Class Name | Class 3 | |||||||||
| No Trading Symbol [Flag] | true | |||||||||
| Annual or Semi-Annual Statement [Text Block] | The semi-annual shareholder report contains important information about Baillie Gifford Institutional Long Term Global Growth Fund (the "Fund") for the period of February 5, 2026 (commencement of operations) to June 30, 2026. | |||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at www.bailliegifford.com/ltgg/TSR. You can also request this information by contacting us at +1-844-394-6127 or via email at northamericanvehiclesteam@bailliegifford.com. | |||||||||
| Additional Information Phone Number | +1-844-394-6127 | |||||||||
| Additional Information Website | www.bailliegifford.com/ltgg/TSR | |||||||||
| Expenses [Text Block] | What were the Fund costs for the last six months?(based on a hypothetical $10,000 investment) |
|||||||||
| Expenses Paid, Amount | $ 26 | [3] | ||||||||
| Expense Ratio, Percent | 0.63% | [4] | ||||||||
| AssetsNet | $ 138,236,652 | |||||||||
| Holdings Count | Holding | 38 | |||||||||
| Advisory Fees Paid, Amount | $ 210,944 | |||||||||
| InvestmentCompanyPortfolioTurnover | 19.00% | |||||||||
| Additional Fund Statistics [Text Block] | Key Fund Statistics as of June 30, 2026The following table outlines key Fund statistics that you should pay attention to:
|
|||||||||
| Additional Fund Statistics Significance or Limits [Text Block] | The following table outlines key Fund statistics that you should pay attention to: |
|||||||||
| Holdings [Text Block] | Tabular Representation of Holdings as of June 30, 2026The following table shows the industry sector allocation of the Fund. |
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