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Shareholder Report
 6 Months Ended
Nov. 30, 2024
USD ($)
Holding
Shareholder Report [Line Items]  
Document Type N-CSRS
Amendment Flag false
Registrant Name AMG Funds III
Entity Central Index Key 0000720309
Entity Investment Company Type N-1A
Document Period End Date Nov. 30, 2024
C000091187 [Member]  
Shareholder Report [Line Items]  
Fund Name AMG GW&K International Small Cap Fund
Class Name Class N
Trading Symbol MECAX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about AMG GW&K International Small Cap Fund (the “Fund”) for the period of June 1, 2024 to November 30, 2024.
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)
Fund (Class) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment
AMG GW&K International Small Cap Fund
(Class N/MECAX)		 $57 1.14%
Expenses Paid, Amount $ 57
Expense Ratio, Percent 1.14%
Net Assets $ 39,802,877
Holdings Count | Holding 74
Advisory Fees Paid, Amount $ 69,621
Investment Company Portfolio Turnover 10.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics (as of November 30, 2024)
Fund net assets $39,802,877
Total number of portfolio holdings 74
Net advisory fees paid $69,621
Portfolio turnover rate as of the end of the reporting period 10%
Holdings [Text Block]
Graphical Representation of Holdings (as of November 30, 2024)
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
Senshu Electric Co., Ltd. (Japan) 2.7%
Gift Holdings, Inc. (Japan) 2.6%
Tel Aviv Stock Exchange, Ltd. (Israel) 2.5%
Hill & Smith PLC (United Kingdom) 2.1%
Elopak A.S.A. (Norway) 2.1%
ADENTRA, Inc. (Canada) 2.0%
Digital Information Technologies Corp. (Japan) 2.0%
First Pacific Co., Ltd. (Hong Kong) 2.0%
Kitron A.S.A. (Norway) 1.9%
Vidrala, S.A. (Spain) 1.9%
Top Ten as a Group 21.8%
Portfolio Breakdown
Graphical Representation - Allocation 1 Chart
Country Allocation
Graphical Representation - Allocation 2 Chart
Largest Holdings [Text Block]
Top Ten Holdings
Senshu Electric Co., Ltd. (Japan) 2.7%
Gift Holdings, Inc. (Japan) 2.6%
Tel Aviv Stock Exchange, Ltd. (Israel) 2.5%
Hill & Smith PLC (United Kingdom) 2.1%
Elopak A.S.A. (Norway) 2.1%
ADENTRA, Inc. (Canada) 2.0%
Digital Information Technologies Corp. (Japan) 2.0%
First Pacific Co., Ltd. (Hong Kong) 2.0%
Kitron A.S.A. (Norway) 1.9%
Vidrala, S.A. (Spain) 1.9%
Top Ten as a Group 21.8%
C000091188 [Member]  
Shareholder Report [Line Items]  
Fund Name AMG GW&K International Small Cap Fund
Class Name Class I
Trading Symbol MECIX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about AMG GW&K International Small Cap Fund (the “Fund”) for the period of June 1, 2024 to November 30, 2024.
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)
Fund (Class) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment
AMG GW&K International Small Cap Fund
(Class I/MECIX)		 $49 0.99%
Expenses Paid, Amount $ 49
Expense Ratio, Percent 0.99%
Net Assets $ 39,802,877
Holdings Count | Holding 74
Advisory Fees Paid, Amount $ 69,621
Investment Company Portfolio Turnover 10.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics (as of November 30, 2024)
Fund net assets $39,802,877
Total number of portfolio holdings 74
Net advisory fees paid $69,621
Portfolio turnover rate as of the end of the reporting period 10%
Holdings [Text Block]
Graphical Representation of Holdings (as of November 30, 2024)
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
Senshu Electric Co., Ltd. (Japan) 2.7%
Gift Holdings, Inc. (Japan) 2.6%
Tel Aviv Stock Exchange, Ltd. (Israel) 2.5%
Hill & Smith PLC (United Kingdom) 2.1%
Elopak A.S.A. (Norway) 2.1%
ADENTRA, Inc. (Canada) 2.0%
Digital Information Technologies Corp. (Japan) 2.0%
First Pacific Co., Ltd. (Hong Kong) 2.0%
Kitron A.S.A. (Norway) 1.9%
Vidrala, S.A. (Spain) 1.9%
Top Ten as a Group 21.8%
Portfolio Breakdown
Graphical Representation - Allocation 1 Chart
Country Allocation
Graphical Representation - Allocation 2 Chart
Largest Holdings [Text Block]
Top Ten Holdings
Senshu Electric Co., Ltd. (Japan) 2.7%
Gift Holdings, Inc. (Japan) 2.6%
Tel Aviv Stock Exchange, Ltd. (Israel) 2.5%
Hill & Smith PLC (United Kingdom) 2.1%
Elopak A.S.A. (Norway) 2.1%
ADENTRA, Inc. (Canada) 2.0%
Digital Information Technologies Corp. (Japan) 2.0%
First Pacific Co., Ltd. (Hong Kong) 2.0%
Kitron A.S.A. (Norway) 1.9%
Vidrala, S.A. (Spain) 1.9%
Top Ten as a Group 21.8%
C000188985 [Member]  
Shareholder Report [Line Items]  
Fund Name AMG GW&K International Small Cap Fund
Class Name Class Z
Trading Symbol MECZX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about AMG GW&K International Small Cap Fund (the “Fund”) for the period of June 1, 2024 to November 30, 2024.
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)
Fund (Class) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment
AMG GW&K International Small Cap Fund
(Class Z/MECZX)		 $44 0.89%
Expenses Paid, Amount $ 44
Expense Ratio, Percent 0.89%
Net Assets $ 39,802,877
Holdings Count | Holding 74
Advisory Fees Paid, Amount $ 69,621
Investment Company Portfolio Turnover 10.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics (as of November 30, 2024)
Fund net assets $39,802,877
Total number of portfolio holdings 74
Net advisory fees paid $69,621
Portfolio turnover rate as of the end of the reporting period 10%
Holdings [Text Block]
Graphical Representation of Holdings (as of November 30, 2024)
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
Senshu Electric Co., Ltd. (Japan) 2.7%
Gift Holdings, Inc. (Japan) 2.6%
Tel Aviv Stock Exchange, Ltd. (Israel) 2.5%
Hill & Smith PLC (United Kingdom) 2.1%
Elopak A.S.A. (Norway) 2.1%
ADENTRA, Inc. (Canada) 2.0%
Digital Information Technologies Corp. (Japan) 2.0%
First Pacific Co., Ltd. (Hong Kong) 2.0%
Kitron A.S.A. (Norway) 1.9%
Vidrala, S.A. (Spain) 1.9%
Top Ten as a Group 21.8%
Portfolio Breakdown
Graphical Representation - Allocation 1 Chart
Country Allocation
Graphical Representation - Allocation 2 Chart
Largest Holdings [Text Block]
Top Ten Holdings
Senshu Electric Co., Ltd. (Japan) 2.7%
Gift Holdings, Inc. (Japan) 2.6%
Tel Aviv Stock Exchange, Ltd. (Israel) 2.5%
Hill & Smith PLC (United Kingdom) 2.1%
Elopak A.S.A. (Norway) 2.1%
ADENTRA, Inc. (Canada) 2.0%
Digital Information Technologies Corp. (Japan) 2.0%
First Pacific Co., Ltd. (Hong Kong) 2.0%
Kitron A.S.A. (Norway) 1.9%
Vidrala, S.A. (Spain) 1.9%
Top Ten as a Group 21.8%