Shareholder Report |
6 Months Ended | ||||||||||||||||||||||
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Mar. 31, 2025
USD ($)
Holding
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Shareholder Report [Line Items] | |||||||||||||||||||||||
Document Type | N-CSRS | ||||||||||||||||||||||
Amendment Flag | false | ||||||||||||||||||||||
Registrant Name | AMG Funds I | ||||||||||||||||||||||
Entity Central Index Key | 0000882443 | ||||||||||||||||||||||
Entity Investment Company Type | N-1A | ||||||||||||||||||||||
Document Period End Date | Mar. 31, 2025 | ||||||||||||||||||||||
C000130199 [Member] | |||||||||||||||||||||||
Shareholder Report [Line Items] | |||||||||||||||||||||||
Fund Name | AMG Boston Common Global Impact Fund | ||||||||||||||||||||||
Class Name | Class I | ||||||||||||||||||||||
Trading Symbol | BRWIX | ||||||||||||||||||||||
Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about AMG Boston Common Global Impact Fund (the “Fund”) for the period of October 1, 2024 to March 31, 2025. | ||||||||||||||||||||||
Shareholder Report Annual or Semi-Annual | semi-annual shareholder report | ||||||||||||||||||||||
Additional Information [Text Block] | You can find additional information about the Fund at https://wealth.amg.com/literature. You can also request this information by contacting us at 800.548.4539. | ||||||||||||||||||||||
Additional Information Phone Number | 800.548.4539 | ||||||||||||||||||||||
Additional Information Website | https://wealth.amg.com/literature | ||||||||||||||||||||||
Expenses [Text Block] | Fund Expenses What were the Fund costs for the last six months? (Based on a hypothetical $10,000 investment)
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Expenses Paid, Amount | $ 44 | ||||||||||||||||||||||
Expense Ratio, Percent | 0.93% | ||||||||||||||||||||||
Net Assets | $ 488,979,342 | ||||||||||||||||||||||
Holdings Count | Holding | 71 | ||||||||||||||||||||||
Advisory Fees Paid, Amount | $ 1,911,161 | ||||||||||||||||||||||
Investment Company Portfolio Turnover | 40.00% | ||||||||||||||||||||||
Additional Fund Statistics [Text Block] | Key Fund Statistics (as of March 31, 2025)
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Holdings [Text Block] | Graphical Representation of Holdings (as of March 31, 2025) Top ten holdings and portfolio breakdown are shown as a percentage of net assets of the Fund and country allocation is shown as a percentage of total long-term investments of the Fund. Top Ten Holdings
Portfolio Breakdown ![]() Country Allocation ![]() |
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Largest Holdings [Text Block] | Top Ten Holdings
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C000130200 [Member] | |||||||||||||||||||||||
Shareholder Report [Line Items] | |||||||||||||||||||||||
Fund Name | AMG Veritas Global Real Return Fund | ||||||||||||||||||||||
Class Name | Class I | ||||||||||||||||||||||
Trading Symbol | BLUEX | ||||||||||||||||||||||
Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about AMG Veritas Global Real Return Fund (the “Fund”) for the period of October 1, 2024 to March 31, 2025. | ||||||||||||||||||||||
Shareholder Report Annual or Semi-Annual | semi-annual shareholder report | ||||||||||||||||||||||
Additional Information [Text Block] | You can find additional information about the Fund at https://wealth.amg.com/literature. You can also request this information by contacting us at 800.548.4539. | ||||||||||||||||||||||
Additional Information Phone Number | 800.548.4539 | ||||||||||||||||||||||
Additional Information Website | https://wealth.amg.com/literature | ||||||||||||||||||||||
Expenses [Text Block] | Fund Expenses What were the Fund costs for the last six months? (Based on a hypothetical $10,000 investment)
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Expenses Paid, Amount | $ 58 | ||||||||||||||||||||||
Expense Ratio, Percent | 1.16% | ||||||||||||||||||||||
Net Assets | $ 99,204,866 | ||||||||||||||||||||||
Holdings Count | Holding | 33 | ||||||||||||||||||||||
Advisory Fees Paid, Amount | $ 392,523 | ||||||||||||||||||||||
Investment Company Portfolio Turnover | 11.00% | ||||||||||||||||||||||
Additional Fund Statistics [Text Block] | Key Fund Statistics (as of March 31, 2025)
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Holdings [Text Block] | Graphical Representation of Holdings (as of March 31, 2025) Top ten holdings and portfolio breakdown are shown as a percentage of net assets of the Fund and country allocation is shown as a percentage of total long-term investments of the Fund. Top Ten Holdings
Portfolio Breakdown ![]() Country Allocation ![]() |
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Largest Holdings [Text Block] | Top Ten Holdings
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C000248366 [Member] | |||||||||||||||||||||||
Shareholder Report [Line Items] | |||||||||||||||||||||||
Fund Name | AMG Systematica Managed Futures Strategy Fund | ||||||||||||||||||||||
Class Name | Class N | ||||||||||||||||||||||
Trading Symbol | SMFNX | ||||||||||||||||||||||
Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about AMG Systematica Managed Futures Strategy Fund (the “Fund”) for the period of October 1, 2024 to March 31, 2025. | ||||||||||||||||||||||
Shareholder Report Annual or Semi-Annual | semi-annual shareholder report | ||||||||||||||||||||||
Additional Information [Text Block] | You can find additional information about the Fund at https://wealth.amg.com/literature. You can also request this information by contacting us at 800.548.4539. | ||||||||||||||||||||||
Additional Information Phone Number | 800.548.4539 | ||||||||||||||||||||||
Additional Information Website | https://wealth.amg.com/literature | ||||||||||||||||||||||
Expenses [Text Block] | Fund Expenses What were the Fund costs for the last six months? (Based on a hypothetical $10,000 investment)
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Expenses Paid, Amount | $ 58 | ||||||||||||||||||||||
Expense Ratio, Percent | 1.21% | ||||||||||||||||||||||
Material Change Date | Dec. 06, 2024 | ||||||||||||||||||||||
Net Assets | $ 5,596,734 | ||||||||||||||||||||||
Holdings Count | Holding | 240 | ||||||||||||||||||||||
Advisory Fees Paid, Amount | $ 0 | ||||||||||||||||||||||
Investment Company Portfolio Turnover | 0.00% | ||||||||||||||||||||||
Additional Fund Statistics [Text Block] | Key Fund Statistics (as of March 31, 2025)
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Holdings [Text Block] | Graphical Representation of Holdings (as of March 31, 2025) The portfolio breakdown is shown as a percentage of net assets of the Fund and notional allocation is shown as a percentage of total notional value of the Fund's derivatives holdings. The portfolio breakdown and notional allocation are inclusive of the Fund's wholly-owned subsidiary. Portfolio Breakdown ![]() NOTIONAL ALLOCATION ![]() |
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Material Fund Change [Text Block] | Recent Fund Changes This is a summary of certain changes to the Fund since October 1, 2024. For more information, you may review the Fund's prospectus at https://wealth.amg.com/literature. The Fund's prospectus is also available without charge by calling 800.548.4539 or by sending an e-mail request to shareholderservices@amg.com. Effective December 6, 2024, AMG Funds LLC has contractually agreed, through February 1, 2026, to waive the management fee payable by the Fund by 0.30%, from 1.20% to 0.90%.
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Material Fund Change Expenses [Text Block] | Effective December 6, 2024, AMG Funds LLC has contractually agreed, through February 1, 2026, to waive the management fee payable by the Fund by 0.30%, from 1.20% to 0.90%.
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Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since October 1, 2024. For more information, you may review the Fund's prospectus at https://wealth.amg.com/literature. The Fund's prospectus is also available without charge by calling 800.548.4539 or by sending an e-mail request to shareholderservices@amg.com.
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Updated Prospectus Phone Number | 800.548.4539 | ||||||||||||||||||||||
Updated Prospectus Email Address | shareholderservices@amg.com | ||||||||||||||||||||||
Updated Prospectus Web Address | https://wealth.amg.com/literature | ||||||||||||||||||||||
C000248367 [Member] | |||||||||||||||||||||||
Shareholder Report [Line Items] | |||||||||||||||||||||||
Fund Name | AMG Systematica Managed Futures Strategy Fund | ||||||||||||||||||||||
Class Name | Class I | ||||||||||||||||||||||
Trading Symbol | SMFIX | ||||||||||||||||||||||
Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about AMG Systematica Managed Futures Strategy Fund (the “Fund”) for the period of October 1, 2024 to March 31, 2025. | ||||||||||||||||||||||
Shareholder Report Annual or Semi-Annual | semi-annual shareholder report | ||||||||||||||||||||||
Additional Information [Text Block] | You can find additional information about the Fund at https://wealth.amg.com/literature. You can also request this information by contacting us at 800.548.4539. | ||||||||||||||||||||||
Additional Information Phone Number | 800.548.4539 | ||||||||||||||||||||||
Additional Information Website | https://wealth.amg.com/literature | ||||||||||||||||||||||
Expenses [Text Block] | Fund Expenses What were the Fund costs for the last six months? (Based on a hypothetical $10,000 investment)
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Expenses Paid, Amount | $ 58 | ||||||||||||||||||||||
Expense Ratio, Percent | 1.21% | ||||||||||||||||||||||
Material Change Date | Dec. 06, 2024 | ||||||||||||||||||||||
Net Assets | $ 5,596,734 | ||||||||||||||||||||||
Holdings Count | Holding | 240 | ||||||||||||||||||||||
Advisory Fees Paid, Amount | $ 0 | ||||||||||||||||||||||
Investment Company Portfolio Turnover | 0.00% | ||||||||||||||||||||||
Additional Fund Statistics [Text Block] | Key Fund Statistics (as of March 31, 2025)
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Holdings [Text Block] | Graphical Representation of Holdings (as of March 31, 2025) The portfolio breakdown is shown as a percentage of net assets of the Fund and notional allocation is shown as a percentage of total notional value of the Fund's derivatives holdings. The portfolio breakdown and notional allocation are inclusive of the Fund's wholly-owned subsidiary. Portfolio Breakdown ![]() NOTIONAL ALLOCATION ![]() |
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Material Fund Change [Text Block] | Recent Fund Changes This is a summary of certain changes to the Fund since October 1, 2024. For more information, you may review the Fund's prospectus at https://wealth.amg.com/literature. The Fund's prospectus is also available without charge by calling 800.548.4539 or by sending an e-mail request to shareholderservices@amg.com. Effective December 6, 2024, AMG Funds LLC has contractually agreed, through February 1, 2026, to waive the management fee payable by the Fund by 0.30%, from 1.20% to 0.90%.
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Material Fund Change Expenses [Text Block] | Effective December 6, 2024, AMG Funds LLC has contractually agreed, through February 1, 2026, to waive the management fee payable by the Fund by 0.30%, from 1.20% to 0.90%.
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Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since October 1, 2024. For more information, you may review the Fund's prospectus at https://wealth.amg.com/literature. The Fund's prospectus is also available without charge by calling 800.548.4539 or by sending an e-mail request to shareholderservices@amg.com.
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Updated Prospectus Phone Number | 800.548.4539 | ||||||||||||||||||||||
Updated Prospectus Email Address | shareholderservices@amg.com | ||||||||||||||||||||||
Updated Prospectus Web Address | https://wealth.amg.com/literature | ||||||||||||||||||||||
C000248365 [Member] | |||||||||||||||||||||||
Shareholder Report [Line Items] | |||||||||||||||||||||||
Fund Name | AMG Systematica Managed Futures Strategy Fund | ||||||||||||||||||||||
Class Name | Class Z | ||||||||||||||||||||||
Trading Symbol | SMFZX | ||||||||||||||||||||||
Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about AMG Systematica Managed Futures Strategy Fund (the “Fund”) for the period of October 1, 2024 to March 31, 2025. | ||||||||||||||||||||||
Shareholder Report Annual or Semi-Annual | semi-annual shareholder report | ||||||||||||||||||||||
Additional Information [Text Block] | You can find additional information about the Fund at https://wealth.amg.com/literature. You can also request this information by contacting us at 800.548.4539. | ||||||||||||||||||||||
Additional Information Phone Number | 800.548.4539 | ||||||||||||||||||||||
Additional Information Website | https://wealth.amg.com/literature | ||||||||||||||||||||||
Expenses [Text Block] | Fund Expenses What were the Fund costs for the last six months? (Based on a hypothetical $10,000 investment)
|
||||||||||||||||||||||
Expenses Paid, Amount | $ 58 | ||||||||||||||||||||||
Expense Ratio, Percent | 1.21% | ||||||||||||||||||||||
Material Change Date | Dec. 06, 2024 | ||||||||||||||||||||||
Net Assets | $ 5,596,734 | ||||||||||||||||||||||
Holdings Count | Holding | 240 | ||||||||||||||||||||||
Advisory Fees Paid, Amount | $ 0 | ||||||||||||||||||||||
Investment Company Portfolio Turnover | 0.00% | ||||||||||||||||||||||
Additional Fund Statistics [Text Block] | Key Fund Statistics (as of March 31, 2025)
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Holdings [Text Block] | Graphical Representation of Holdings (as of March 31, 2025) The portfolio breakdown is shown as a percentage of net assets of the Fund and notional allocation is shown as a percentage of total notional value of the Fund's derivatives holdings. The portfolio breakdown and notional allocation are inclusive of the Fund's wholly-owned subsidiary. Portfolio Breakdown ![]() NOTIONAL ALLOCATION ![]() |
||||||||||||||||||||||
Material Fund Change [Text Block] | Recent Fund Changes This is a summary of certain changes to the Fund since October 1, 2024. For more information, you may review the Fund's prospectus at https://wealth.amg.com/literature. The Fund's prospectus is also available without charge by calling 800.548.4539 or by sending an e-mail request to shareholderservices@amg.com. Effective December 6, 2024, AMG Funds LLC has contractually agreed, through February 1, 2026, to waive the management fee payable by the Fund by 0.30%, from 1.20% to 0.90%.
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Material Fund Change Expenses [Text Block] | Effective December 6, 2024, AMG Funds LLC has contractually agreed, through February 1, 2026, to waive the management fee payable by the Fund by 0.30%, from 1.20% to 0.90%.
|
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Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since October 1, 2024. For more information, you may review the Fund's prospectus at https://wealth.amg.com/literature. The Fund's prospectus is also available without charge by calling 800.548.4539 or by sending an e-mail request to shareholderservices@amg.com.
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Updated Prospectus Phone Number | 800.548.4539 | ||||||||||||||||||||||
Updated Prospectus Email Address | shareholderservices@amg.com | ||||||||||||||||||||||
Updated Prospectus Web Address | https://wealth.amg.com/literature | ||||||||||||||||||||||
C000257775 [Member] | |||||||||||||||||||||||
Shareholder Report [Line Items] | |||||||||||||||||||||||
Fund Name | AMG Systematica Trend-Enhanced Markets Fund | ||||||||||||||||||||||
Class Name | Class N | ||||||||||||||||||||||
Trading Symbol | STMBX | ||||||||||||||||||||||
Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about AMG Systematica Trend-Enhanced Markets Fund (the “Fund”) for March 31, 2025 (inception date). | ||||||||||||||||||||||
Shareholder Report Annual or Semi-Annual | semi-annual shareholder report | ||||||||||||||||||||||
Additional Information [Text Block] | You can find additional information about the Fund at https://wealth.amg.com/literature. You can also request this information by contacting us at 800.548.4539. | ||||||||||||||||||||||
Additional Information Phone Number | 800.548.4539 | ||||||||||||||||||||||
Additional Information Website | https://wealth.amg.com/literature | ||||||||||||||||||||||
Expenses [Text Block] | Fund Expenses What were the Fund costs for the last six months? (Based on a hypothetical $10,000 investment)
|
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Expenses Paid, Amount | $ 0 | ||||||||||||||||||||||
Expense Ratio, Percent | 0.00% | ||||||||||||||||||||||
Net Assets | $ 6,000,000 | ||||||||||||||||||||||
Holdings Count | Holding | 0 | ||||||||||||||||||||||
Advisory Fees Paid, Amount | $ 0 | ||||||||||||||||||||||
Investment Company Portfolio Turnover | 0.00% | ||||||||||||||||||||||
Additional Fund Statistics [Text Block] | Key Fund Statistics (as of March 31, 2025)
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Holdings [Text Block] | Graphical Representation of Holdings (as of March 31, 2025) The Fund's inception date was March 31, 2025, and the Fund held a 100% cash position only.
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C000257776 [Member] | |||||||||||||||||||||||
Shareholder Report [Line Items] | |||||||||||||||||||||||
Fund Name | AMG Systematica Trend-Enhanced Markets Fund | ||||||||||||||||||||||
Class Name | Class I | ||||||||||||||||||||||
Trading Symbol | STMIX | ||||||||||||||||||||||
Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about AMG Systematica Trend-Enhanced Markets Fund (the “Fund”) for March 31, 2025 (inception date). | ||||||||||||||||||||||
Shareholder Report Annual or Semi-Annual | semi-annual shareholder report | ||||||||||||||||||||||
Additional Information [Text Block] | You can find additional information about the Fund at https://wealth.amg.com/literature. You can also request this information by contacting us at 800.548.4539. | ||||||||||||||||||||||
Additional Information Phone Number | 800.548.4539 | ||||||||||||||||||||||
Additional Information Website | https://wealth.amg.com/literature | ||||||||||||||||||||||
Expenses [Text Block] | Fund Expenses What were the Fund costs for the last six months? (Based on a hypothetical $10,000 investment)
|
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Expenses Paid, Amount | $ 0 | ||||||||||||||||||||||
Expense Ratio, Percent | 0.00% | ||||||||||||||||||||||
Net Assets | $ 6,000,000 | ||||||||||||||||||||||
Holdings Count | Holding | 0 | ||||||||||||||||||||||
Advisory Fees Paid, Amount | $ 0 | ||||||||||||||||||||||
Investment Company Portfolio Turnover | 0.00% | ||||||||||||||||||||||
Additional Fund Statistics [Text Block] | Key Fund Statistics (as of March 31, 2025)
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Holdings [Text Block] | Graphical Representation of Holdings (as of March 31, 2025) The Fund's inception date was March 31, 2025, and the Fund held a 100% cash position only.
|
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C000257774 [Member] | |||||||||||||||||||||||
Shareholder Report [Line Items] | |||||||||||||||||||||||
Fund Name | AMG Systematica Trend-Enhanced Markets Fund | ||||||||||||||||||||||
Class Name | Class Z | ||||||||||||||||||||||
Trading Symbol | STMZX | ||||||||||||||||||||||
Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about AMG Systematica Trend-Enhanced Markets Fund (the “Fund”) for March 31, 2025 (inception date). | ||||||||||||||||||||||
Shareholder Report Annual or Semi-Annual | semi-annual shareholder report | ||||||||||||||||||||||
Additional Information [Text Block] | You can find additional information about the Fund at https://wealth.amg.com/literature. You can also request this information by contacting us at 800.548.4539. | ||||||||||||||||||||||
Additional Information Phone Number | 800.548.4539 | ||||||||||||||||||||||
Additional Information Website | https://wealth.amg.com/literature | ||||||||||||||||||||||
Expenses [Text Block] | Fund Expenses What were the Fund costs for the last six months? (Based on a hypothetical $10,000 investment)
|
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Expenses Paid, Amount | $ 0 | ||||||||||||||||||||||
Expense Ratio, Percent | 0.00% | ||||||||||||||||||||||
Net Assets | $ 6,000,000 | ||||||||||||||||||||||
Holdings Count | Holding | 0 | ||||||||||||||||||||||
Advisory Fees Paid, Amount | $ 0 | ||||||||||||||||||||||
Investment Company Portfolio Turnover | 0.00% | ||||||||||||||||||||||
Additional Fund Statistics [Text Block] | Key Fund Statistics (as of March 31, 2025)
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Holdings [Text Block] | Graphical Representation of Holdings (as of March 31, 2025) The Fund's inception date was March 31, 2025, and the Fund held a 100% cash position only.
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