v3.26.1
Shareholder Report
12 Months Ended
Sep. 30, 2025
USD ($)
Holding
Shareholder Report [Line Items]  
Document Type N-CSR
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 Sep. 30, 2025
C000254727  
Shareholder Report [Line Items]  
Fund Name Brown Advisory Flexible Equity ETF
Class Name Brown Advisory Flexible Equity ETF
Trading Symbol BAFE
Security Exchange Name NASDAQ
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about the Brown Advisory Flexible Equity ETF (the "Fund") for the period from November 15, 2024 (commencement of operations) to September 30, 2025.
Additional Information [Text Block] You can find additional information about the Fund at https://brownadvisory.com/etf/flexible-equity-etf. You can also request this information by contacting us at 1-877-876-6383. 
Additional Information Phone Number 1-877-876-6383
Additional Information Website https://brownadvisory.com/etf/flexible-equity-etf
Expenses [Text Block]

What were the Fund costs for the period?

(based on a hypothetical $10,000 investment) 

Fund Name
Costs of a $10,000 investmentFootnote Reference*
Costs paid as a percentage of a $10,000 investment
Brown Advisory Flexible Equity ETF
$49
0.54%
FootnoteDescription
Footnote*
Costs shown not annualized. If the Fund had been open for the full fiscal year, costs shown would have been higher for the period ended.
Expenses Paid, Amount $ 49
Expense Ratio, Percent 0.54%
Performance Past Does Not Indicate Future [Text] Past performance is not indicative of future performance.
Line Graph [Table Text Block]
Growth Chart
Brown Advisory Flexible Equity ETF
S&P 500 Index (USD) (NR)Footnote Reference*
Nov/24
$10,000
$10,000
Nov/24
$10,332
$10,280
Dec/24
$9,986
$10,031
Jan/25
$10,527
$10,308
Feb/25
$10,174
$10,170
Mar/25
$9,646
$9,593
Apr/25
$9,498
$9,526
May/25
$10,066
$10,121
Jun/25
$10,555
$10,632
Jul/25
$10,563
$10,869
Aug/25
$10,695
$11,085
Sep/25
$10,815
$11,486
Average Annual Return [Table Text Block]
Fund/Index Name
Cumulative Since Inception
Brown Advisory Flexible Equity ETF
8.15%
S&P 500 Index (USD) (NR)Footnote Reference*
14.86%
No Deduction of Taxes [Text Block] The table and graph presented above do not reflect the deduction of taxes a shareholder would pay on Fund distributions or the redemption of Fund shares.
Material Change Description [Text Block]

How did the Fund perform in the period?

HOW DID THE FUND PERFORM LAST YEAR AND WHAT AFFECTED ITS PERFORMANCE?

Since the ETF’s inception through September 30, 2025, the Fund lagged its benchmark, the S&P 500® Index. While the market delivered strong absolute returns over the period, the journey from start to finish was far from smooth. Notably, the S&P 500 experienced a sharp 19% drawdown from its February high to its April 8th low, driven largely by fears of an all-out trade war. The Index, however, recovered from its April low and finished the period near an alltime high.

 

WHAT FACTORS INFLUENCED PERFORMANCE

Stock selection was the primary driver of relative performance. The performance of the Fund was positively driven by the Consumer Discretionary, Communication Services and Energy sectors. Top individual contributors included: Microsoft Corporation, Taiwan Semiconductor Manufacturing, Meta Platforms, Amer Sports and Alphabet Inc. The Financials sector was the largest detractor, with Fiserv, Inc. and KKR & Co. contributing most negatively to returns within the sector.

 

POSITIONING

The Fund’s Energy sector exposure declined during the period following the sale of Baker Hughes. The Health Care weighting decreased due to both sector underperformance and the elimination of Agilent Technologies. In Real Estate, the elimination of SBA Communications reduced the sector allocation to zero. Information Technology exposure increased, driven by strong sector performance and the addition of KLA Corporation and Marvell Technology.

AssetsNet $ 1,444,706,000
Holdings Count | Holding 45
Advisory Fees Paid, Amount $ 4,628
InvestmentCompanyPortfolioTurnover 14.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics as of September 30, 2025

Total Net Assets (000's)
Number of Holdings
Total Advisory Fees Paid (000's)
Portfolio Turnover Rate
$1,444,706
45
$4,628
14%
Holdings [Text Block]

Sector WeightingsFootnote Reference*

Holdings Chart
Value
Value
Consumer Staples
2.0%
Energy
2.0%
Health Care
8.8%
Industrials
10.4%
Consumer Discretionary
10.9%
Communication Services
13.1%
Information Technology
24.4%
Financials
26.0%
FootnoteDescription
Footnote*
Percentages are calculated based on total net assets.
Largest Holdings [Text Block]

Top Ten Holdings

Holding Name
Percentage of Total Net Assets
Microsoft
8.0%
Meta Platforms, Cl A
5.5%
Taiwan Semiconductor Manufacturing ADR
4.9%
Visa, Cl A
4.4%
Amazon.com
4.3%
Mastercard, Cl A
4.2%
KKR
3.8%
Berkshire Hathaway, Cl B
3.6%
Alphabet, Cl A
3.3%
Alphabet, Cl C
3.1%
Material Fund Change [Text Block]

Material Fund Changes

There were no material changes during the reporting period.  

Updated Prospectus Phone Number 1-877-876-6383
Updated Prospectus Web Address https://brownadvisory.com/etf/flexible-equity-etf
C000259983  
Shareholder Report [Line Items]  
Fund Name Brown Advisory Sustainable Growth ETF
Class Name Brown Advisory Sustainable Growth ETF
Trading Symbol BASG
Security Exchange Name NASDAQ
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about the Brown Advisory Sustainable Growth ETF (the "Fund") for the period from June 13, 2025 (commencement of operations) to September 30, 2025.
Additional Information [Text Block] You can find additional information about the Fund at https://www.brownadvisory.com/etf/sustainable-growth-etf. You can also request this information by contacting us at 1-877-876-6383. 
Additional Information Phone Number 1-877-876-6383
Additional Information Website https://www.brownadvisory.com/etf/sustainable-growth-etf
Expenses [Text Block]

What were the Fund costs for the period?

(based on a hypothetical $10,000 investment) 

Fund Name
Costs of a $10,000 investmentFootnote Reference*
Costs paid as a percentage of a $10,000 investment
Brown Advisory Sustainable Growth ETF
$19
0.61%
FootnoteDescription
Footnote*
Costs shown not annualized. If the Fund had been open for the full fiscal year, costs shown would have been higher for the period ended.
Expenses Paid, Amount $ 19
Expense Ratio, Percent 0.61%
Performance Past Does Not Indicate Future [Text] Past performance is not indicative of future performance.
Line Graph [Table Text Block]
Growth Chart
Brown Advisory Sustainable Growth ETF
Russell 1000 Index (USD) (TR)Footnote Reference*
Russell 1000 Growth Index (USD) (TR)Footnote Reference*
Jun/25
$10,000
$10,000
$10,000
Jun/25
$10,480
$10,391
$10,480
Jul/25
$10,668
$10,621
$10,876
Aug/25
$10,416
$10,845
$10,998
Sep/25
$10,592
$11,221
$11,582
Average Annual Return [Table Text Block]
Fund/Index Name
Cumulative Since Inception
Brown Advisory Sustainable Growth ETF
5.92%
Russell 1000 Index (USD) (TR)Footnote Reference*
12.21%
Russell 1000 Growth Index (USD) (TR)Footnote Reference*
15.82%
No Deduction of Taxes [Text Block] The table and graph presented above do not reflect the deduction of taxes a shareholder would pay on Fund distributions or the redemption of Fund shares.
Material Change Description [Text Block]

How did the Fund perform in the period?

HOW DID THE FUND PERFORM LAST YEAR AND WHAT AFFECTED ITS PERFORMANCE?

For the period between the inception of the vehicle on 6/13/25 and 9/30/25, the Brown Advisory Large Cap Sustainable Growth ETF delivered positive returns but trailed its primary benchmark, the Russell 1000 Growth Index by a significant margin.

 

WHAT FACTORS INFLUENCED PERFORMANCE

During the period, the combined effects of a disadvantageous market environment and unfavorable stock selection led to significant underperformance for the strategy relative to the Russell 1000 Growth Index. Continuing the theme that has largely defined the market environment for the better part of the last three years, investors continued to crowd into the secular trend in artificial intelligence throughout the period, resulting in yet another extremely narrow, top-heavy, momentum-driven market. From an attribution perspective, sector positioning and stock selection had a negative effect on relative returns against the Russell 1000 Growth® Index. At the sector level, the strategy’s overweight to financials and underweight to information technology were the largest detractors, which was partially offset by positive effects of the strategy’s lack of exposure to consumer staples, real estate, and energy. Inclusive of stock selection and interaction, relative strength from our health care and semiconductor names was not enough to overcome the weakness from our consumer discretionary, financials, and software names. During the period, all six of the strategy’s semiconductor names outperformed on the strength of robust fundamental results, encouraging forward outlooks, and broader investor enthusiasm for the companies that provide the essential building blocks for the data center infrastructure needed support the growing demand for artificial intelligence solutions. Insurance was a notable area of weakness, as PGR, VRSK, and AJG all lagged during the period on concerns about rising claims costs in auto and property markets, consumer and regulatory scrutiny of increased premiums, and the impact of both dynamics on future top- and bottom-line growth.

 

POSITIONING

Consistent with the strategy’s long-standing portfolio construction philosophy, we continued to balance exposure between durable and rapid growth companies while ensuring diversification by business model, end market, and growth theme. Trading activity was also in line with our historical turnover range. In keeping with our one-in, one-out philosophy, we added three new names to the portfolio during the period – IOT, EFX, and SNOW – and exited positions in WDAY, GOOGL, and MSCI. We believe these trades represent upgrades to the portfolio that will better position the strategy for success in the quarters and years ahead.

AssetsNet $ 550,110,000
Holdings Count | Holding 35
Advisory Fees Paid, Amount $ 754
InvestmentCompanyPortfolioTurnover 18.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics as of September 30, 2025

Total Net Assets (000's)
Number of Holdings
Total Advisory Fees Paid (000's)
Portfolio Turnover Rate
$550,110
35
$754
18%
Holdings [Text Block]

Sector WeightingsFootnote Reference*

Holdings Chart
Value
Value
Materials
1.8%
Communication Services
3.3%
Health Care
6.8%
Consumer Discretionary
11.2%
Industrials
12.9%
Financials
17.3%
Information Technology
44.8%
FootnoteDescription
Footnote*
Percentages are calculated based on total net assets.
Largest Holdings [Text Block]

Top Ten Holdings

Holding Name
Percentage of Total Net Assets
NVIDIA
8.3%
Microsoft
8.3%
Amazon.com
7.2%
Intuit
3.9%
Visa, Cl A
3.8%
Taiwan Semiconductor Manufacturing ADR
3.2%
Marvell Technology
3.2%
Arthur J Gallagher
3.2%
KKR
3.0%
Monolithic Power Systems
2.9%
Material Fund Change [Text Block]

Material Fund Changes

There were no material changes during the reporting period.  

Updated Prospectus Phone Number 1-877-876-6383
Updated Prospectus Web Address https://www.brownadvisory.com/etf/sustainable-growth-etf
C000259984  
Shareholder Report [Line Items]  
Fund Name Brown Advisory Sustainable Value ETF
Class Name Brown Advisory Sustainable Value ETF
Trading Symbol BASV
Security Exchange Name NASDAQ
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about the Brown Advisory Sustainable Value ETF (the "Fund") for the period from June 13, 2025 (commencement of operations) to September 30, 2025.
Additional Information [Text Block] You can find additional information about the Fund at https://www.brownadvisory.com/etf/sustainable-value-etf. You can also request this information by contacting us at 1-877-876-6383. 
Additional Information Phone Number 1-877-876-6383
Additional Information Website https://www.brownadvisory.com/etf/sustainable-value-etf
Expenses [Text Block]

What were the Fund costs for the period?

(based on a hypothetical $10,000 investment) 

Fund Name
Costs of a $10,000 investmentFootnote Reference*
Costs paid as a percentage of a $10,000 investment
Brown Advisory Sustainable Value ETF
$22
0.71%
FootnoteDescription
Footnote*
Costs shown not annualized. If the Fund had been open for the full fiscal year, costs shown would have been higher for the period ended.
Expenses Paid, Amount $ 22
Expense Ratio, Percent 0.71%
Performance Past Does Not Indicate Future [Text] Past performance is not indicative of future performance.
Line Graph [Table Text Block]
Growth Chart
Brown Advisory Sustainable Value ETF
Russell 1000 Index (USD) (TR)Footnote Reference*
Russell 1000 Value Index (USD)
Jun/25
$10,000
$10,000
$10,000
Jun/25
$10,344
$10,391
$10,279
Jul/25
$10,364
$10,621
$10,338
Aug/25
$10,724
$10,845
$10,668
Sep/25
$10,768
$11,221
$10,827
Average Annual Return [Table Text Block]
Fund/Index Name
Cumulative Since Inception
Brown Advisory Sustainable Value ETF
7.68%
Russell 1000 Index (USD) (TR)Footnote Reference*
12.21%
Russell 1000 Value Index (USD)
8.27%
No Deduction of Taxes [Text Block] The table and graph presented above do not reflect the deduction of taxes a shareholder would pay on Fund distributions or the redemption of Fund shares.
Material Change Description [Text Block]

How did the Fund perform in the period?

HOW DID THE FUND PERFORM LAST YEAR AND WHAT AFFECTED ITS PERFORMANCE?

For the period between the inception of the vehicle on 6/13/25 and 9/30/25, the Brown Advisory Large Cap Sustainable Value ETF delivered positive absolute returns but slightly trailed its primary benchmark, the Russell 1000 Value Index.

 

WHAT FACTORS INFLUENCED PERFORMANCE

Similar to what we have seen for most of 2025, the market continued its march higher during the period. This steady increase in equity markets saw a return of growth indexes outperforming their value counterparts. Information Technology and Communication Services were two of the best performing sectors as the market continues to focus on all things related to artificial intelligence and hyperscaler capex trends. It is our belief that this narrow focus by an increasingly large group of investors is creating a growing sense of apathy in other areas of the market, thus creating attractive new opportunities. From an attribution perspective, Health Care, Financial Services, and Communication Services were the leading sources of underperformance during the period. Within health care, Elevance (ELV) lowered it guidance for the remainder of 2025 as increased costs in its Medicaid and public health exchange businesses continue to weight on margin. Within Financial Services, Fidelity National Information Services (FIS) came under pressure as investors questioned management’s ability to hit its full year margin and free cash flow targets. Information Technology, Materials, and Real Estate were the leading contributors to performance during the period. Both Dell Technologies (DELL) and TD SYNNEX (SNX) posted strong quarterly results with strong capital returns to shareholders, and each is benefitting from the increase in global IT spending. In Materials, CRH plc (CRH) continues to execute at a high level and the company was able to post solid second quarter results despite investor concerns around inclement weather across the U.S. for most of the spring season.

 

POSITIONING

During the period we exited three investments and made two new investments. We sold our remaining positions in Best Buy (BBY) and Ameriprise (AMP), and our position in ChampionX (CHX) was converted into SLB shares upon the closing of their recently announced merger agreement. We used the proceeds from those sales to establish a new position in health care - Hologic (HOLX) and one in materials- Smurfit Westrock (SW). At our time of purchase each of these new positions were trading at attractive absolute valuations and sizable discounts to both their closest peers and their respective historical multiples. We continue to believe that a portfolio of companies that generate high levels of free cash flow, possess a Sustainable Cash Flow Advantage (SCFA), exhibit capital discipline, and trade at attractive valuations will lead to compelling risk adjusted returns over the long term while providing a margin of safety for our investors.

AssetsNet $ 194,168,000
Holdings Count | Holding 41
Advisory Fees Paid, Amount $ 241
InvestmentCompanyPortfolioTurnover 13.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics as of September 30, 2025

Total Net Assets (000's)
Number of Holdings
Total Advisory Fees Paid (000's)
Portfolio Turnover Rate
$194,168
41
$241
13%
Holdings [Text Block]

Sector WeightingsFootnote Reference*

Holdings Chart
Value
Value
Real Estate
3.0%
Utilities
3.2%
Consumer Discretionary
3.9%
Consumer Staples
4.2%
Energy
5.2%
Materials
7.5%
Communication Services
7.6%
Industrials
10.1%
Information Technology
12.1%
Health Care
18.5%
Financials
20.0%
FootnoteDescription
Footnote*
Percentages are calculated based on total net assets.
Largest Holdings [Text Block]

Top Ten Holdings

Holding Name
Percentage of Total Net Assets
CRH
5.2%
Sanofi ADR
4.1%
Bank of America
3.8%
Willis Towers Watson
3.7%
Cardinal Health
3.6%
Unilever ADR
3.5%
American International Group
3.4%
Schlumberger
3.3%
Constellation Energy
3.2%
Ferguson Enterprises
3.2%
Material Fund Change [Text Block]

Material Fund Changes

There were no material changes during the reporting period.  

Updated Prospectus Phone Number 1-877-876-6383
Updated Prospectus Web Address https://www.brownadvisory.com/etf/sustainable-value-etf