v3.26.1
Shareholder Report
 6 Months Ended
Mar. 31, 2026
USD ($)
Holding
Shareholder Report [Line Items]  
Document Type N-CSRS
Amendment Flag false
Registrant Name Advisors' Inner Circle Fund III
Entity Central Index Key 0001593547
Entity Investment Company Type N-1A
Document Period End Date Mar. 31, 2026
C000223246  
Shareholder Report [Line Items]  
Fund Name SouthernSun Small Cap Fund
Class Name Class N Shares
Trading Symbol SSSFX
Annual or Semi-Annual Statement [Text Block] Semi-Annual Shareholder Report
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] This semi-annual shareholder report contains important information about Class N Shares of the SouthernSun Small Cap Fund (the "Fund") for the period from October 1, 2025 to March 31, 2026. You can find additional information about the Fund at https://southernsunam.com/investment-products/small-cap-fund/. You can also request this information by contacting us at 866-392-2626.
Additional Information Phone Number 866-392-2626
Additional Information Website https://southernsunam.com/investment-products/small-cap-fund/
Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment) 

Table Summary
Fund Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
SouthernSun Small Cap Fund, Class N Shares
$68
1.36%
Expenses Paid, Amount $ 68
Expense Ratio, Percent 1.36%
AssetsNet $ 238,490,545
Holdings Count | Holding 23
Advisory Fees Paid, Amount $ 1,009,010
InvestmentCompanyPortfolioTurnover 17.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics as of March 31, 2026

Table Summary
Total Net Assets
Number of Holdings
Total Advisory Fees Paid
Portfolio Turnover Rate
$238,490,545
23
$1,009,010
17%
Holdings [Text Block]

Sector WeightingsFootnote Reference*

Holdings Chart
Table Summary
Value
Value
Health Care
4.8%
Financials
5.3%
Consumer Staples
9.5%
Materials
11.2%
Information Technology
16.8%
Consumer Discretionary
18.1%
Industrials
32.1%
FootnoteDescription
Footnote*
Percentages are calculated based on total net assets.
Largest Holdings [Text Block]

Top Ten Holdings

Table Summary
Holding Name
Percentage of Total Net Assets
Darling Ingredients
6.8%
Murphy USA
6.0%
Boot Barn Holdings
5.7%
Live Oak Bancshares
5.3%
Extreme Networks
5.2%
Louisiana-Pacific
5.1%
Brink's
4.9%
Dorman Products
4.9%
US Physical Therapy
4.8%
Crane NXT
4.6%
Updated Prospectus Phone Number 866-392-2626
Updated Prospectus Web Address https://southernsunam.com/investment-products/small-cap-fund/
C000223247  
Shareholder Report [Line Items]  
Fund Name SouthernSun Small Cap Fund
Class Name Class I Shares
Trading Symbol SSSIX
Annual or Semi-Annual Statement [Text Block] Semi-Annual Shareholder Report
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] This semi-annual shareholder report contains important information about Class I Shares of the SouthernSun Small Cap Fund (the "Fund") for the period from October 1, 2025 to March 31, 2026. You can find additional information about the Fund at https://southernsunam.com/investment-products/small-cap-fund/. You can also request this information by contacting us at 866-392-2626.
Additional Information Phone Number 866-392-2626
Additional Information Website https://southernsunam.com/investment-products/small-cap-fund/
Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment) 

Table Summary
Fund Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
SouthernSun Small Cap Fund, Class I Shares
$56
1.11%
Expenses Paid, Amount $ 56
Expense Ratio, Percent 1.11%
AssetsNet $ 238,490,545
Holdings Count | Holding 23
Advisory Fees Paid, Amount $ 1,009,010
InvestmentCompanyPortfolioTurnover 17.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics as of March 31, 2026

Table Summary
Total Net Assets
Number of Holdings
Total Advisory Fees Paid
Portfolio Turnover Rate
$238,490,545
23
$1,009,010
17%
Holdings [Text Block]

Sector WeightingsFootnote Reference*

Holdings Chart
Table Summary
Value
Value
Health Care
4.8%
Financials
5.3%
Consumer Staples
9.5%
Materials
11.2%
Information Technology
16.8%
Consumer Discretionary
18.1%
Industrials
32.1%
FootnoteDescription
Footnote*
Percentages are calculated based on total net assets.
Largest Holdings [Text Block]

Top Ten Holdings

Table Summary
Holding Name
Percentage of Total Net Assets
Darling Ingredients
6.8%
Murphy USA
6.0%
Boot Barn Holdings
5.7%
Live Oak Bancshares
5.3%
Extreme Networks
5.2%
Louisiana-Pacific
5.1%
Brink's
4.9%
Dorman Products
4.9%
US Physical Therapy
4.8%
Crane NXT
4.6%
Updated Prospectus Phone Number 866-392-2626
Updated Prospectus Web Address https://southernsunam.com/investment-products/small-cap-fund/
C000223248  
Shareholder Report [Line Items]  
Fund Name SouthernSun U.S. Equity Fund
Class Name Class N
Trading Symbol SSEFX
Annual or Semi-Annual Statement [Text Block] Semi-Annual Shareholder Report
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] This semi-annual shareholder report contains important information about Class N Shares of the SouthernSun U.S. Equity Fund (the "Fund") for the period from October 1, 2025 to March 31, 2026. You can find additional information about the Fund at https://southernsunam.com/investment-products/u-s-equity-fund/. You can also request this information by contacting us at 866-392-2626.
Additional Information Phone Number 866-392-2626
Additional Information Website https://southernsunam.com/investment-products/u-s-equity-fund/
Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment) 

Table Summary
Fund Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
SouthernSun U.S. Equity Fund, Class N Shares
$70
1.40%
Expenses Paid, Amount $ 70
Expense Ratio, Percent 1.40%
AssetsNet $ 45,708,793
Holdings Count | Holding 24
Advisory Fees Paid, Amount $ 137,355
InvestmentCompanyPortfolioTurnover 20.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics as of March 31, 2026

Table Summary
Total Net Assets
Number of Holdings
Total Advisory Fees Paid
Portfolio Turnover Rate
$45,708,793
24
$137,355
20%
Holdings [Text Block]

Sector WeightingsFootnote Reference*

Holdings Chart
Table Summary
Value
Value
Financials
4.0%
Health Care
4.6%
Materials
7.0%
Consumer Staples
8.5%
Information Technology
12.3%
Consumer Discretionary
14.8%
Industrials
42.3%
FootnoteDescription
Footnote*
Percentages are calculated based on total net assets.
Largest Holdings [Text Block]

Top Ten Holdings

Table Summary
Holding Name
Percentage of Total Net Assets
Darling Ingredients
6.7%
API Group
5.9%
Murphy USA
5.6%
Boot Barn Holdings
5.4%
Generac Holdings
5.2%
US Physical Therapy
4.6%
Louisiana-Pacific
4.6%
Broadridge Financial Solutions
4.1%
Crane NXT
4.1%
Extreme Networks
4.1%
Updated Prospectus Phone Number 866-392-2626
Updated Prospectus Web Address https://southernsunam.com/investment-products/u-s-equity-fund/
C000223249  
Shareholder Report [Line Items]  
Fund Name SouthernSun U.S. Equity Fund
Class Name Class I
Trading Symbol SSEIX
Annual or Semi-Annual Statement [Text Block] Semi-Annual Shareholder Report
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] This semi-annual shareholder report contains important information about Class I Shares of the SouthernSun U.S. Equity Fund (the "Fund") for the period from October 1, 2025 to March 31, 2026. You can find additional information about the Fund at https://southernsunam.com/investment-products/u-s-equity-fund/. You can also request this information by contacting us at 866-392-2626.
Additional Information Phone Number 866-392-2626
Additional Information Website https://southernsunam.com/investment-products/u-s-equity-fund/
Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment) 

Table Summary
Fund Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
SouthernSun U.S. Equity Fund, Class I Shares
$55
1.09%
Expenses Paid, Amount $ 55
Expense Ratio, Percent 1.09%
AssetsNet $ 45,708,793
Holdings Count | Holding 24
Advisory Fees Paid, Amount $ 137,355
InvestmentCompanyPortfolioTurnover 20.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics as of March 31, 2026

Table Summary
Total Net Assets
Number of Holdings
Total Advisory Fees Paid
Portfolio Turnover Rate
$45,708,793
24
$137,355
20%
Holdings [Text Block]

Sector WeightingsFootnote Reference*

Holdings Chart
Table Summary
Value
Value
Financials
4.0%
Health Care
4.6%
Materials
7.0%
Consumer Staples
8.5%
Information Technology
12.3%
Consumer Discretionary
14.8%
Industrials
42.3%
FootnoteDescription
Footnote*
Percentages are calculated based on total net assets.
Largest Holdings [Text Block]

Top Ten Holdings

Table Summary
Holding Name
Percentage of Total Net Assets
Darling Ingredients
6.7%
API Group
5.9%
Murphy USA
5.6%
Boot Barn Holdings
5.4%
Generac Holdings
5.2%
US Physical Therapy
4.6%
Louisiana-Pacific
4.6%
Broadridge Financial Solutions
4.1%
Crane NXT
4.1%
Extreme Networks
4.1%
Updated Prospectus Phone Number 866-392-2626
Updated Prospectus Web Address https://southernsunam.com/investment-products/u-s-equity-fund/