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Shareholder Report
 12 Months Ended
Jul. 31, 2025
USD ($)
$ / shares
Shareholder Report [Line Items]  
Document Type N-CSR
Amendment Flag false
Registrant Name Franklin Fund Allocator Series
Entity Central Index Key 0001022804
Entity Investment Company Type N-1A
Document Period End Date Jul. 31, 2025
Class A  
Shareholder Report [Line Items]  
Fund Name Franklin U.S. Core Equity (IU) Fund
Class Name Advisor
No Trading Symbol Flag true
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about Franklin U.S. Core Equity (IU) Fund for the period August 1, 2024, to July 31, 2025.
Shareholder Report Annual or Semi-Annual annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at https://www.franklintempleton.com/regulatory-internalusefunds-documents. You can also request this information by contacting us at (800) DIAL BEN/342-5236.
Additional Information Phone Number (800) DIAL BEN/342-5236
Additional Information Website https://www.franklintempleton.com/regulatory-internalusefunds-documents
Expenses [Text Block]
WHAT WERE THE FUND COSTS FOR THE LAST YEAR? (based on a hypothetical $10,000 investment)
Fund Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment*
Franklin U.S. Core Equity (IU) Fund
$0
0.00%
[1]
Expenses Paid, Amount $ 0
Expense Ratio, Percent 0.00%
Factors Affecting Performance [Text Block]
HOW DID THE FUND PERFORM LAST YEAR AND WHAT AFFECTED ITS PERFORMANCE?
For the twelve months ended July 31, 2025, Franklin U.S. Core Equity (IU) Fund returned 16.70%. The Fund compares its performance to the S&P 500 Index, which returned 16.33% for the same period.
PERFORMANCE HIGHLIGHTS
Top contributors to performance:
↑
Selection among health care stocks
↑
Selection among utilities stocks
↑
Selection within the communication services sector
Top detractors from performance:
↓
Selection within the information technology sector
↓
Selection among industrials stocks
↓
Selection among financials stocks
Performance Past Does Not Indicate Future [Text] The Fund’s past performance is not necessarily an indication of how the Fund will perform in the future.
Line Graph [Table Text Block]
image
Average Annual Return [Table Text Block]
AVERAGE ANNUAL TOTAL RETURNS (%) Period Ended July 31, 2025
 
1 Year
5 Year
Since Inception
(8/19/2019)
Franklin U.S. Core Equity (IU) Fund
16.70
15.94
15.94
Russell 3000 Index
15.68
15.19
15.01
S&P 500 Index
16.33
15.88
15.70
No Deduction of Taxes [Text Block] The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares.
Updated Performance Information Location [Text Block]
For current month-end performance, please call Franklin Templeton at (800) DIAL BEN/342-5236.
Important data provider notices and terms available at www.franklintempletondatasources.com.
Net Assets $ 1,084,221,791
Holdings Count | $ / shares 181 [2]
Advisory Fees Paid, Amount $ 0
Investment Company Portfolio Turnover 63.98%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (as of July 31, 2025)
Total Net Assets
$1,084,221,791
Total Number of Portfolio Holdings*
181
Total Management Fee Paid
$0
Portfolio Turnover Rate
63.98%
[2]
Holdings [Text Block]
WHAT DID THE FUND INVEST IN? (as of July 31, 2025)
Portfolio Composition* (% of Total Investments)
image
 [3]
Updated Prospectus Web Address https://www.franklintempleton.com/regulatory-internalusefunds-documents
Class A  
Shareholder Report [Line Items]  
Fund Name Franklin International Core Equity (IU) Fund
Class Name Advisor
No Trading Symbol Flag true
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about Franklin International Core Equity (IU) Fund for the period August 1, 2024, to July 31, 2025.
Shareholder Report Annual or Semi-Annual annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at https://www.franklintempleton.com/regulatory-internalusefunds-documents. You can also request this information by contacting us at (800) DIAL BEN/342-5236.
Additional Information Phone Number (800) DIAL BEN/342-5236
Additional Information Website https://www.franklintempleton.com/regulatory-internalusefunds-documents
Expenses [Text Block]
WHAT WERE THE FUND COSTS FOR THE LAST YEAR? (based on a hypothetical $10,000 investment)
Fund Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment*
Franklin International Core Equity (IU) Fund
$0
0.00%
[4]
Expenses Paid, Amount $ 0
Expense Ratio, Percent 0.00%
Factors Affecting Performance [Text Block]
HOW DID THE FUND PERFORM LAST YEAR AND WHAT AFFECTED ITS PERFORMANCE?
For the twelve months ended July 31, 2025, Franklin International Core Equity (IU) Fund returned 12.96%. The Fund compares its performance to the MSCI EAFE Index, which returned 13.35% for the same period.
PERFORMANCE HIGHLIGHTS
Top contributors to performance:  
↑
Selection among utilities stocks
↑
Selection among financials stocks
↑
Selection within the health care sector
Top detractors from performance:  
↓
Underweight allocation to financials stocks
↓
Underweight allocation to industrials stocks
↓
Selection among energy stocks
Performance Past Does Not Indicate Future [Text] The Fund’s past performance is not necessarily an indication of how the Fund will perform in the future.
Line Graph [Table Text Block]
image
Average Annual Return [Table Text Block]
AVERAGE ANNUAL TOTAL RETURNS (%) Period Ended July 31, 2025
 
1 Year
5 Year
Since Inception
(8/19/2019)
Franklin International Core Equity (IU) Fund
12.96
10.61
9.84
MSCI All Country World ex-U.S. Index-NR
14.73
9.11
8.44
MSCI EAFE Index
13.35
10.89
9.48
No Deduction of Taxes [Text Block] The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares.
Updated Performance Information Location [Text Block]
For current month-end performance, please call Franklin Templeton at (800) DIAL BEN/342-5236.
Important data provider notices and terms available at www.franklintempletondatasources.com.
Net Assets $ 435,753,638
Holdings Count | $ / shares 181 [5]
Advisory Fees Paid, Amount $ 0
Investment Company Portfolio Turnover 65.93%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (as of July 31, 2025)
Total Net Assets
$435,753,638
Total Number of Portfolio Holdings*
181
Total Management Fee Paid
$0
Portfolio Turnover Rate
65.93%
[5]
Holdings [Text Block]
WHAT DID THE FUND INVEST IN? (as of July 31, 2025)
Portfolio Composition* (% of Total Investments)
image
 [6]
Updated Prospectus Web Address https://www.franklintempleton.com/regulatory-internalusefunds-documents
Class A  
Shareholder Report [Line Items]  
Fund Name Franklin Emerging Market Core Equity (IU) Fund
Class Name Advisor
No Trading Symbol Flag true
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about Franklin Emerging Market Core Equity (IU) Fund for the period August 1, 2024, to July 31, 2025.
Shareholder Report Annual or Semi-Annual annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at https://www.franklintempleton.com/regulatory-internalusefunds-documents. You can also request this information by contacting us at (800) DIAL BEN/342-5236.
Additional Information Phone Number (800) DIAL BEN/342-5236
Additional Information Website https://www.franklintempleton.com/regulatory-internalusefunds-documents
Expenses [Text Block]
WHAT WERE THE FUND COSTS FOR THE LAST YEAR? (based on a hypothetical $10,000 investment)
Fund Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment*
Franklin Emerging Market Core Equity (IU) Fund
$0
0.00%
[7]
Expenses Paid, Amount $ 0
Expense Ratio, Percent 0.00%
Factors Affecting Performance [Text Block]
HOW DID THE FUND PERFORM LAST YEAR AND WHAT AFFECTED ITS PERFORMANCE?
For the twelve months ended July 31, 2025, Franklin Emerging Market Core Equity (IU) Fund returned 18.74%. The Fund compares its performance to the MSCI Emerging Markets Index, which returned 17.87% for the same period.
PERFORMANCE HIGHLIGHTS
Top contributors to performance:
↑
Selection among consumer discretionary stocks  
↑
Selection among financials stocks
↑
Selection within the real estate sector
Top detractors from performance:
↓
Selection among information technology stocks
↓
Selection within the industrials sector
↓
Selection among materials stocks
Performance Past Does Not Indicate Future [Text] The Fund’s past performance is not necessarily an indication of how the Fund will perform in the future.
Line Graph [Table Text Block]
image
Average Annual Return [Table Text Block]
AVERAGE ANNUAL TOTAL RETURNS (%) Period Ended July 31, 2025
 
1 Year
5 Year
Since Inception
(9/30/2019)
Franklin Emerging Market Core Equity (IU) Fund
18.74
6.24
6.72
MSCI All Country World ex-U.S. Index-NR
14.73
9.11
7.99
MSCI Emerging Markets Index
17.87
5.85
6.76
No Deduction of Taxes [Text Block] The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares.
Updated Performance Information Location [Text Block]
For current month-end performance, please call Franklin Templeton at (800) DIAL BEN/342-5236.
Important data provider notices and terms available at www.franklintempletondatasources.com.
Net Assets $ 161,965,908
Holdings Count | $ / shares 185 [8]
Advisory Fees Paid, Amount $ 0
Investment Company Portfolio Turnover 59.40%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (as of July 31, 2025)
Total Net Assets
$161,965,908
Total Number of Portfolio Holdings*
185
Total Management Fee Paid
$0
Portfolio Turnover Rate
59.40%
[8]
Holdings [Text Block]
WHAT DID THE FUND INVEST IN? (as of July 31, 2025)
Portfolio Composition* (% of Total Investments)
image
 [9]
Updated Prospectus Web Address https://www.franklintempleton.com/regulatory-internalusefunds-documents
[1]
* Reflects fee waivers and/or expense reimbursements, without which expenses would have been higher.
[2]
* Does not include derivatives, except purchased options, if any.  
[3]
* Does not include derivatives, except purchased options, if any.  
[4]
* Reflects fee waivers and/or expense reimbursements, without which expenses would have been higher.
[5]
* Does not include derivatives, except purchased options, if any.  
[6]
* Does not include derivatives, except purchased options, if any.  
[7]
* Reflects fee waivers and/or expense reimbursements, without which expenses would have been higher.
[8]
* Does not include derivatives, except purchased options, if any.  
[9]
* Does not include derivatives, except purchased options, if any.