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Shareholder Report
12 Months Ended
Sep. 01, 2023
Aug. 31, 2024
USD ($)
Holding
Shareholder Report [Line Items]    
Document Type   N-CSR
Amendment Flag   false
Registrant Name   DEUTSCHE DWS ASSET ALLOCATION TRUST
Entity Central Index Key   0000926425
Entity Investment Company Type   N-1A
Document Period End Date   Aug. 31, 2024
C000016765    
Shareholder Report [Line Items]    
Fund Name   DWS Multi-Asset Conservative Allocation Fund
Class Name   Class A
Trading Symbol   SPDAX
Annual or Semi-Annual Statement [Text Block]   This annual shareholder report contains important information about DWS Multi-Asset Conservative Allocation Fund ("the Fund") for the period September 1, 2023 to August 31, 2024.
Shareholder Report Annual or Semi-Annual   Annual Shareholder Report
Additional Information [Text Block]   You can find additional information about the Fund on the Fund's website at dws.com/mutualreports. You can also request this information by contacting us at (800) 728-3337.
Additional Information Phone Number   (800) 728-3337
Additional Information Website   <span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 14.6667px; font-weight: 300; grid-area: auto; line-height: 17.6px; margin: 0px; overflow: visible; text-align: left;">dws.com/mutualreports</span>
Expenses [Text Block]  

What were the Fund costs for the last year?

(Based on a hypothetical $10,000 investment)

Cost of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class A
$66
0.62%

Gross expense ratio as of the latest prospectus: 1.17%. See prospectus for any contractual or voluntary waivers; without a waiver, costs would have been higher. Fund costs do not reflect expenses of the underlying funds in which the Fund invests.

Expenses Paid, Amount   $ 66
Expense Ratio, Percent   0.62%
Performance Past Does Not Indicate Future [Text]   The Fund's past performance is not a good predictor or guarantee of the Fund's future performance.
Average Annual Return [Table Text Block]  
Class/Index
1-Year
5-Year
10-Year
Class A Unadjusted for Sales Charge
13.07%
4.21%
3.62%
Class A Adjusted for the Maximum Sales Charge (max 5.75% load)
6.57%
2.98%
3.01%
MSCI ACWI All Cap Index
22.55%
11.79%
8.53%
Bloomberg Global Aggregate Index
6.90%
-1.37%
0.12%
S&P Target Risk Conservative Index
12.34%
3.94%
4.04%
No Deduction of Taxes [Text Block]   The performance graph and returns table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or the redemption of Fund shares.
Material Change Date Sep. 01, 2023  
AssetsNet   $ 64,024,039
Holdings Count | Holding   23
Advisory Fees Paid, Amount   $ 0
InvestmentCompanyPortfolioTurnover   53.00%
Additional Fund Statistics [Text Block]  

Key Fund Statistics

Net Assets ($)
64,024,039
Number of Portfolio Holdings
23
Portfolio Turnover Rate (%)
53
Total Net Advisory Fees Paid ($)
0
Holdings [Text Block]  

Asset Allocation

Asset Type
% of Net Assets
Fixed Income - Bond Funds
7%
Fixed Income - Exchange-Traded Funds
47%
Fixed Income - Money Market Funds
4%
Equity - Equity Funds
32%
Equity - Exchange-Traded Funds
9%
Government & Agency Obligations
1%
Total
100%
Material Fund Change [Text Block]  

Material Fund Changes 

This is a summary of certain changes of the Fund since September 1, 2023. For more information, review the Fund's current prospectus at dws.com/mutualreports, or call (800) 728-3337.

Effective October 1, 2023, the Fund’s contractual cap on total annual operating expense for Class A shares changed from 1.05% to 0.95%. The cap includes indirect expenses of underlying funds and excludes certain expenses such as extraordinary expenses, taxes, brokerage and interest expense.

Material Fund Change Expenses [Text Block]  

Effective October 1, 2023, the Fund’s contractual cap on total annual operating expense for Class A shares changed from 1.05% to 0.95%. The cap includes indirect expenses of underlying funds and excludes certain expenses such as extraordinary expenses, taxes, brokerage and interest expense.

Summary of Change Legend [Text Block]  

This is a summary of certain changes of the Fund since September 1, 2023. For more information, review the Fund's current prospectus at dws.com/mutualreports, or call (800) 728-3337.

C000016768    
Shareholder Report [Line Items]    
Fund Name   DWS Multi-Asset Conservative Allocation Fund
Class Name   Class C
Trading Symbol   SPDCX
Annual or Semi-Annual Statement [Text Block]   This annual shareholder report contains important information about DWS Multi-Asset Conservative Allocation Fund ("the Fund") for the period September 1, 2023 to August 31, 2024.
Shareholder Report Annual or Semi-Annual   Annual Shareholder Report
Additional Information [Text Block]   You can find additional information about the Fund on the Fund's website at dws.com/mutualreports. You can also request this information by contacting us at (800) 728-3337.
Additional Information Phone Number   (800) 728-3337
Additional Information Website   <span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 14.6667px; font-weight: 300; grid-area: auto; line-height: 17.6px; margin: 0px; overflow: visible; text-align: left;">dws.com/mutualreports</span>
Expenses [Text Block]  

What were the Fund costs for the last year?

(Based on a hypothetical $10,000 investment)

Cost of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class C
$145
1.37%

Gross expense ratio as of the latest prospectus: 2.03%. See prospectus for any contractual or voluntary waivers; without a waiver, costs would have been higher. Fund costs do not reflect expenses of the underlying funds in which the Fund invests.

Expenses Paid, Amount   $ 145
Expense Ratio, Percent   1.37%
Performance Past Does Not Indicate Future [Text]   The Fund's past performance is not a good predictor or guarantee of the Fund's future performance.
Average Annual Return [Table Text Block]  
Class/Index
1-Year
5-Year
10-Year
Class C Unadjusted for Sales Charge
12.23%
3.44%
2.85%
Class C Adjusted for the Maximum Sales Charge (max 1.00% CDSC)
11.23%
3.44%
2.85%
MSCI ACWI All Cap Index
22.55%
11.79%
8.53%
Bloomberg Global Aggregate Index
6.90%
-1.37%
0.12%
S&P Target Risk Conservative Index
12.34%
3.94%
4.04%
No Deduction of Taxes [Text Block]   The performance graph and returns table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or the redemption of Fund shares.
Material Change Date Sep. 01, 2023  
AssetsNet   $ 64,024,039
Holdings Count | Holding   23
Advisory Fees Paid, Amount   $ 0
InvestmentCompanyPortfolioTurnover   53.00%
Additional Fund Statistics [Text Block]  

Key Fund Statistics

Net Assets ($)
64,024,039
Number of Portfolio Holdings
23
Portfolio Turnover Rate (%)
53
Total Net Advisory Fees Paid ($)
0
Holdings [Text Block]  

Asset Allocation

Asset Type
% of Net Assets
Fixed Income - Bond Funds
7%
Fixed Income - Exchange-Traded Funds
47%
Fixed Income - Money Market Funds
4%
Equity - Equity Funds
32%
Equity - Exchange-Traded Funds
9%
Government & Agency Obligations
1%
Total
100%
Material Fund Change [Text Block]  

Material Fund Changes 

This is a summary of certain changes of the Fund since September 1, 2023. For more information, review the Fund's current prospectus at dws.com/mutualreports, or call (800) 728-3337.

Effective October 1, 2023, the Fund’s contractual cap on total annual operating expense for Class C shares changed from 1.80% to 1.70%. The cap includes indirect expenses of underlying funds and excludes certain expenses such as extraordinary expenses, taxes, brokerage and interest expense.

Material Fund Change Expenses [Text Block]  

Effective October 1, 2023, the Fund’s contractual cap on total annual operating expense for Class C shares changed from 1.80% to 1.70%. The cap includes indirect expenses of underlying funds and excludes certain expenses such as extraordinary expenses, taxes, brokerage and interest expense.

Summary of Change Legend [Text Block]  

This is a summary of certain changes of the Fund since September 1, 2023. For more information, review the Fund's current prospectus at dws.com/mutualreports, or call (800) 728-3337.

C000016769    
Shareholder Report [Line Items]    
Fund Name   DWS Multi-Asset Conservative Allocation Fund
Class Name   Class S
Trading Symbol   SPBAX
Annual or Semi-Annual Statement [Text Block]   This annual shareholder report contains important information about DWS Multi-Asset Conservative Allocation Fund ("the Fund") for the period September 1, 2023 to August 31, 2024.
Shareholder Report Annual or Semi-Annual   Annual Shareholder Report
Additional Information [Text Block]   You can find additional information about the Fund on the Fund's website at dws.com/mutualreports. You can also request this information by contacting us at (800) 728-3337.
Additional Information Phone Number   (800) 728-3337
Additional Information Website   <span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 14.6667px; font-weight: 300; grid-area: auto; line-height: 17.6px; margin: 0px; overflow: visible; text-align: left;">dws.com/mutualreports</span>
Expenses [Text Block]  

What were the Fund costs for the last year?

(Based on a hypothetical $10,000 investment)

Cost of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class S
$39
0.37%

Gross expense ratio as of the latest prospectus: 0.92%. See prospectus for any contractual or voluntary waivers; without a waiver, costs would have been higher. Fund costs do not reflect expenses of the underlying funds in which the Fund invests.

Expenses Paid, Amount   $ 39
Expense Ratio, Percent   0.37%
Performance Past Does Not Indicate Future [Text]   The Fund's past performance is not a good predictor or guarantee of the Fund's future performance.
Average Annual Return [Table Text Block]  
Class/Index
1-Year
5-Year
10-Year
Class S No Sales Charge
13.38%
4.47%
3.89%
MSCI ACWI All Cap Index
22.55%
11.79%
8.53%
Bloomberg Global Aggregate Index
6.90%
-1.37%
0.12%
S&P Target Risk Conservative Index
12.34%
3.94%
4.04%
No Deduction of Taxes [Text Block]   The performance graph and returns table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or the redemption of Fund shares.
Material Change Date Sep. 01, 2023  
AssetsNet   $ 64,024,039
Holdings Count | Holding   23
Advisory Fees Paid, Amount   $ 0
InvestmentCompanyPortfolioTurnover   53.00%
Additional Fund Statistics [Text Block]  

Key Fund Statistics

Net Assets ($)
64,024,039
Number of Portfolio Holdings
23
Portfolio Turnover Rate (%)
53
Total Net Advisory Fees Paid ($)
0
Holdings [Text Block]  

Asset Allocation

Asset Type
% of Net Assets
Fixed Income - Bond Funds
7%
Fixed Income - Exchange-Traded Funds
47%
Fixed Income - Money Market Funds
4%
Equity - Equity Funds
32%
Equity - Exchange-Traded Funds
9%
Government & Agency Obligations
1%
Total
100%
Material Fund Change [Text Block]  

Material Fund Changes 

This is a summary of certain changes of the Fund since September 1, 2023. For more information, review the Fund's current prospectus at dws.com/mutualreports, or call (800) 728-3337.

Effective October 1, 2023, the Fund’s contractual cap on total annual operating expense for Class S shares changed from 0.80% to 0.70%. The cap includes indirect expenses of underlying funds and excludes certain expenses such as extraordinary expenses, taxes, brokerage and interest expense.

Material Fund Change Expenses [Text Block]  

Effective October 1, 2023, the Fund’s contractual cap on total annual operating expense for Class S shares changed from 0.80% to 0.70%. The cap includes indirect expenses of underlying funds and excludes certain expenses such as extraordinary expenses, taxes, brokerage and interest expense.

Summary of Change Legend [Text Block]  

This is a summary of certain changes of the Fund since September 1, 2023. For more information, review the Fund's current prospectus at dws.com/mutualreports, or call (800) 728-3337.

C000016756    
Shareholder Report [Line Items]    
Fund Name   DWS Multi-Asset Moderate Allocation Fund
Class Name   Class A
Trading Symbol   PLUSX
Annual or Semi-Annual Statement [Text Block]   This annual shareholder report contains important information about DWS Multi-Asset Moderate Allocation Fund ("the Fund") for the period September 1, 2023 to August 31, 2024.
Shareholder Report Annual or Semi-Annual   Annual Shareholder Report
Additional Information [Text Block]   You can find additional information about the Fund on the Fund's website at dws.com/mutualreports. You can also request this information by contacting us at (800) 728-3337.
Additional Information Phone Number   (800) 728-3337
Additional Information Website   <span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 14.6667px; font-weight: 300; grid-area: auto; line-height: 17.6px; margin: 0px; overflow: visible; text-align: left;">dws.com/mutualreports</span>
Expenses [Text Block]  

What were the Fund costs for the last year?

(Based on a hypothetical $10,000 investment)

Cost of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class A
$67
0.62%

Gross expense ratio as of the latest prospectus: 1.77%. See prospectus for any contractual or voluntary waivers; without a waiver, costs would have been higher. Fund costs do not reflect expenses of the underlying funds in which the Fund invests.

Expenses Paid, Amount   $ 67
Expense Ratio, Percent   0.62%
Performance Past Does Not Indicate Future [Text]   The Fund's past performance is not a good predictor or guarantee of the Fund's future performance.
Average Annual Return [Table Text Block]  
Class/Index
1-Year
5-Year
10-Year
Class A Unadjusted for Sales Charge
16.55%
6.74%
5.10%
Class A Adjusted for the Maximum Sales Charge (max 5.75% load)
9.85%
5.48%
4.47%
MSCI ACWI All Cap Index
22.55%
11.79%
8.53%
Bloomberg Global Aggregate Index
6.90%
-1.37%
0.12%
S&P Target Risk Moderate Index
13.84%
5.14%
4.81%
No Deduction of Taxes [Text Block]   The performance graph and returns table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or the redemption of Fund shares.
Material Change Date Sep. 01, 2023  
AssetsNet   $ 21,471,737
Holdings Count | Holding   24
Advisory Fees Paid, Amount   $ 0
InvestmentCompanyPortfolioTurnover   52.00%
Additional Fund Statistics [Text Block]  

Key Fund Statistics

Net Assets ($)
21,471,737
Number of Portfolio Holdings
24
Portfolio Turnover Rate (%)
52
Total Net Advisory Fees Paid ($)
0
Holdings [Text Block]  

Asset Allocation

Asset Type
% of Net Assets
Fixed Income - Bond Funds
6%
Fixed Income - Exchange-Traded Funds
25%
Fixed Income - Money Market Funds
1%
Equity - Equity Funds
53%
Equity - Exchange-Traded Funds
14%
Government & Agency Obligations
1%
Total
100%
Material Fund Change [Text Block]  

Material Fund Changes 

This is a summary of certain changes of the Fund since September 1, 2023. For more information, review the Fund's current prospectus at dws.com/mutualreports, or call (800) 728-3337.

Effective October 1, 2023, the Fund’s contractual cap on total annual operating expense for Class A shares changed from 1.10% to 1.06%. The cap includes indirect expenses of underlying funds and excludes certain expenses such as extraordinary expenses, taxes, brokerage and interest expense.

Material Fund Change Expenses [Text Block]  

Effective October 1, 2023, the Fund’s contractual cap on total annual operating expense for Class A shares changed from 1.10% to 1.06%. The cap includes indirect expenses of underlying funds and excludes certain expenses such as extraordinary expenses, taxes, brokerage and interest expense.

Summary of Change Legend [Text Block]  

This is a summary of certain changes of the Fund since September 1, 2023. For more information, review the Fund's current prospectus at dws.com/mutualreports, or call (800) 728-3337.

C000016758    
Shareholder Report [Line Items]    
Fund Name   DWS Multi-Asset Moderate Allocation Fund
Class Name   Class C
Trading Symbol   PLSCX
Annual or Semi-Annual Statement [Text Block]   This annual shareholder report contains important information about DWS Multi-Asset Moderate Allocation Fund ("the Fund") for the period September 1, 2023 to August 31, 2024.
Shareholder Report Annual or Semi-Annual   Annual Shareholder Report
Additional Information [Text Block]   You can find additional information about the Fund on the Fund's website at dws.com/mutualreports. You can also request this information by contacting us at (800) 728-3337.
Additional Information Phone Number   (800) 728-3337
Additional Information Website   <span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 14.6667px; font-weight: 300; grid-area: auto; line-height: 17.6px; margin: 0px; overflow: visible; text-align: left;">dws.com/mutualreports</span>
Expenses [Text Block]  

What were the Fund costs for the last year?

(Based on a hypothetical $10,000 investment)

Cost of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class C
$147
1.36%

Gross expense ratio as of the latest prospectus: 2.58%. See prospectus for any contractual or voluntary waivers; without a waiver, costs would have been higher. Fund costs do not reflect expenses of the underlying funds in which the Fund invests.

Expenses Paid, Amount   $ 147
Expense Ratio, Percent   1.36%
Performance Past Does Not Indicate Future [Text]   The Fund's past performance is not a good predictor or guarantee of the Fund's future performance.
Average Annual Return [Table Text Block]  
Class/Index
1-Year
5-Year
10-Year
Class C Unadjusted for Sales Charge
15.57%
5.93%
4.31%
Class C Adjusted for the Maximum Sales Charge (max 1.00% CDSC)
14.57%
5.93%
4.31%
MSCI ACWI All Cap Index
22.55%
11.79%
8.53%
Bloomberg Global Aggregate Index
6.90%
-1.37%
0.12%
S&P Target Risk Moderate Index
13.84%
5.14%
4.81%
No Deduction of Taxes [Text Block]   The performance graph and returns table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or the redemption of Fund shares.
Material Change Date Sep. 01, 2023  
AssetsNet   $ 21,471,737
Holdings Count | Holding   24
Advisory Fees Paid, Amount   $ 0
InvestmentCompanyPortfolioTurnover   52.00%
Additional Fund Statistics [Text Block]  

Key Fund Statistics

Net Assets ($)
21,471,737
Number of Portfolio Holdings
24
Portfolio Turnover Rate (%)
52
Total Net Advisory Fees Paid ($)
0
Holdings [Text Block]  

Asset Allocation

Asset Type
% of Net Assets
Fixed Income - Bond Funds
6%
Fixed Income - Exchange-Traded Funds
25%
Fixed Income - Money Market Funds
1%
Equity - Equity Funds
53%
Equity - Exchange-Traded Funds
14%
Government & Agency Obligations
1%
Total
100%
Material Fund Change [Text Block]  

Material Fund Changes 

This is a summary of certain changes of the Fund since September 1, 2023. For more information, review the Fund's current prospectus at dws.com/mutualreports, or call (800) 728-3337.

Effective October 1, 2023, the Fund’s contractual cap on total annual operating expense for Class C shares changed from 1.85% to 1.81%. The cap includes indirect expenses of underlying funds and excludes certain expenses such as extraordinary expenses, taxes, brokerage and interest expense.

Material Fund Change Expenses [Text Block]  

Effective October 1, 2023, the Fund’s contractual cap on total annual operating expense for Class C shares changed from 1.85% to 1.81%. The cap includes indirect expenses of underlying funds and excludes certain expenses such as extraordinary expenses, taxes, brokerage and interest expense.

Summary of Change Legend [Text Block]  

This is a summary of certain changes of the Fund since September 1, 2023. For more information, review the Fund's current prospectus at dws.com/mutualreports, or call (800) 728-3337.

C000016759    
Shareholder Report [Line Items]    
Fund Name   DWS Multi-Asset Moderate Allocation Fund
Class Name   Class S
Trading Symbol   PPLSX
Annual or Semi-Annual Statement [Text Block]   This annual shareholder report contains important information about DWS Multi-Asset Moderate Allocation Fund ("the Fund") for the period September 1, 2023 to August 31, 2024.
Shareholder Report Annual or Semi-Annual   Annual Shareholder Report
Additional Information [Text Block]   You can find additional information about the Fund on the Fund's website at dws.com/mutualreports. You can also request this information by contacting us at (800) 728-3337.
Additional Information Phone Number   (800) 728-3337
Additional Information Website   <span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 14.6667px; font-weight: 300; grid-area: auto; line-height: 17.6px; margin: 0px; overflow: visible; text-align: left;">dws.com/mutualreports</span>
Expenses [Text Block]  

What were the Fund costs for the last year?

(Based on a hypothetical $10,000 investment)

Cost of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class S
$40
0.37%

Gross expense ratio as of the latest prospectus: 1.52%. See prospectus for any contractual or voluntary waivers; without a waiver, costs would have been higher. Fund costs do not reflect expenses of the underlying funds in which the Fund invests.

Expenses Paid, Amount   $ 40
Expense Ratio, Percent   0.37%
Performance Past Does Not Indicate Future [Text]   The Fund's past performance is not a good predictor or guarantee of the Fund's future performance.
Average Annual Return [Table Text Block]  
Class/Index
1-Year
5-Year
10-Year
Class S No Sales Charge
16.87%
7.02%
5.35%
MSCI ACWI All Cap Index
22.55%
11.79%
8.53%
Bloomberg Global Aggregate Index
6.90%
-1.37%
0.12%
S&P Target Risk Moderate Index
13.84%
5.14%
4.81%
No Deduction of Taxes [Text Block]   The performance graph and returns table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or the redemption of Fund shares.
Material Change Date Sep. 01, 2023  
AssetsNet   $ 21,471,737
Holdings Count | Holding   24
Advisory Fees Paid, Amount   $ 0
InvestmentCompanyPortfolioTurnover   52.00%
Additional Fund Statistics [Text Block]  

Key Fund Statistics

Net Assets ($)
21,471,737
Number of Portfolio Holdings
24
Portfolio Turnover Rate (%)
52
Total Net Advisory Fees Paid ($)
0
Holdings [Text Block]  

Asset Allocation

Asset Type
% of Net Assets
Fixed Income - Bond Funds
6%
Fixed Income - Exchange-Traded Funds
25%
Fixed Income - Money Market Funds
1%
Equity - Equity Funds
53%
Equity - Exchange-Traded Funds
14%
Government & Agency Obligations
1%
Total
100%
Material Fund Change [Text Block]  

Material Fund Changes 

This is a summary of certain changes of the Fund since September 1, 2023. For more information, review the Fund's current prospectus at dws.com/mutualreports, or call (800) 728-3337.

Effective October 1, 2023, the Fund’s contractual cap on total annual operating expense for Class S shares changed from 0.85% to 0.81%. The cap includes indirect expenses of underlying funds and excludes certain expenses such as extraordinary expenses, taxes, brokerage and interest expense.

Material Fund Change Expenses [Text Block]  

Effective October 1, 2023, the Fund’s contractual cap on total annual operating expense for Class S shares changed from 0.85% to 0.81%. The cap includes indirect expenses of underlying funds and excludes certain expenses such as extraordinary expenses, taxes, brokerage and interest expense.

Summary of Change Legend [Text Block]  

This is a summary of certain changes of the Fund since September 1, 2023. For more information, review the Fund's current prospectus at dws.com/mutualreports, or call (800) 728-3337.