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Shareholder Report
 6 Months Ended
Jul. 31, 2024
USD ($)
$ / shares
Shareholder Report [Line Items]  
Document Type N-CSRS
Amendment Flag false
Registrant Name Legg Mason Partners Investment Trust
Entity Central Index Key 0000880366
Entity Investment Company Type N-1A
Document Period End Date Jul. 31, 2024
Class A  
Shareholder Report [Line Items]  
Fund Name Franklin Multi-Asset Growth Fund
Class Name Class A
Trading Symbol SCHAX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Franklin Multi-Asset Growth Fund for the period February 1, 2024, to July 31, 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://www.franklintempleton.com/regulatory-fund-documents. You can also request this information by contacting us at 877-6LM-FUND/656-3863.
Additional Information Phone Number 877-6LM-FUND/656-3863
Additional Information Website https://www.franklintempleton.com/regulatory-fund-documents
Expenses [Text Block]
WHAT WERE THE FUND COSTS FOR THE LAST SIX MONTHS?  (based on a hypothetical $10,000 investment)
Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment†
Class A1
$22
0.41%
[1],[2]
Expenses Paid, Amount $ 22 [1]
Expense Ratio, Percent 0.41% [1]
Net Assets $ 848,713,783
Holdings Count | $ / shares 20 [3]
Investment Company Portfolio Turnover 34.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (as of July 31, 2024)
Total Net Assets
$848,713,783
Total Number of Portfolio Holdings*
20
Portfolio Turnover Rate
34%
[3]
Holdings [Text Block]
image
Updated Prospectus Web Address https://www.franklintempleton.com/regulatory-fund-documents
Class C  
Shareholder Report [Line Items]  
Fund Name Franklin Multi-Asset Growth Fund
Class Name Class C
Trading Symbol SCHCX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Franklin Multi-Asset Growth Fund for the period February 1, 2024, to July 31, 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://www.franklintempleton.com/regulatory-fund-documents. You can also request this information by contacting us at 877-6LM-FUND/656-3863.
Additional Information Phone Number 877-6LM-FUND/656-3863
Additional Information Website https://www.franklintempleton.com/regulatory-fund-documents
Expenses [Text Block]
WHAT WERE THE FUND COSTS FOR THE LAST SIX MONTHS?  (based on a hypothetical $10,000 investment)
Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment†
Class C1
$58
1.11%
[4],[5]
Expenses Paid, Amount $ 58 [4]
Expense Ratio, Percent 1.11% [4]
Net Assets $ 848,713,783
Holdings Count | $ / shares 20 [6]
Investment Company Portfolio Turnover 34.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (as of July 31, 2024)
Total Net Assets
$848,713,783
Total Number of Portfolio Holdings*
20
Portfolio Turnover Rate
34%
[6]
Holdings [Text Block]
image
Updated Prospectus Web Address https://www.franklintempleton.com/regulatory-fund-documents
Class I  
Shareholder Report [Line Items]  
Fund Name Franklin Multi-Asset Growth Fund
Class Name Class I
Trading Symbol LANIX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Franklin Multi-Asset Growth Fund for the period February 1, 2024, to July 31, 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://www.franklintempleton.com/regulatory-fund-documents. You can also request this information by contacting us at 877-6LM-FUND/656-3863.
Additional Information Phone Number 877-6LM-FUND/656-3863
Additional Information Website https://www.franklintempleton.com/regulatory-fund-documents
Expenses [Text Block]
WHAT WERE THE FUND COSTS FOR THE LAST SIX MONTHS?  (based on a hypothetical $10,000 investment)
Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment†
Class I1
$7
0.13%
[7],[8]
Expenses Paid, Amount $ 7 [7]
Expense Ratio, Percent 0.13% [7]
Net Assets $ 848,713,783
Holdings Count | $ / shares 20 [9]
Investment Company Portfolio Turnover 34.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (as of July 31, 2024)
Total Net Assets
$848,713,783
Total Number of Portfolio Holdings*
20
Portfolio Turnover Rate
34%
[9]
Holdings [Text Block]
image
Updated Prospectus Web Address https://www.franklintempleton.com/regulatory-fund-documents
Class R  
Shareholder Report [Line Items]  
Fund Name Franklin Multi-Asset Growth Fund
Class Name Class R
Trading Symbol LLLRX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Franklin Multi-Asset Growth Fund for the period February 1, 2024, to July 31, 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://www.franklintempleton.com/regulatory-fund-documents. You can also request this information by contacting us at 877-6LM-FUND/656-3863.
Additional Information Phone Number 877-6LM-FUND/656-3863
Additional Information Website https://www.franklintempleton.com/regulatory-fund-documents
Expenses [Text Block]
WHAT WERE THE FUND COSTS FOR THE LAST SIX MONTHS?  (based on a hypothetical $10,000 investment)
Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment†
Class R1
$36
0.69%
[10],[11]
Expenses Paid, Amount $ 36 [10]
Expense Ratio, Percent 0.69% [10]
Net Assets $ 848,713,783
Holdings Count | $ / shares 20 [12]
Investment Company Portfolio Turnover 34.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (as of July 31, 2024)
Total Net Assets
$848,713,783
Total Number of Portfolio Holdings*
20
Portfolio Turnover Rate
34%
[12]
Holdings [Text Block]
image
Updated Prospectus Web Address https://www.franklintempleton.com/regulatory-fund-documents
Class A  
Shareholder Report [Line Items]  
Fund Name Franklin Multi-Asset Moderate Growth Fund
Class Name Class A
Trading Symbol SCGRX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Franklin Multi-Asset Moderate Growth Fund for the period February 1, 2024, to July 31, 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://www.franklintempleton.com/regulatory-fund-documents. You can also request this information by contacting us at 877-6LM-FUND/656-3863.
Additional Information Phone Number 877-6LM-FUND/656-3863
Additional Information Website https://www.franklintempleton.com/regulatory-fund-documents
Expenses [Text Block]
WHAT WERE THE FUND COSTS FOR THE LAST SIX MONTHS?  (based on a hypothetical $10,000 investment)
Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment†
Class A1
$22
0.42%
[13],[14]
Expenses Paid, Amount $ 22 [13]
Expense Ratio, Percent 0.42% [13]
Net Assets $ 501,374,305
Holdings Count | $ / shares 21 [15]
Investment Company Portfolio Turnover 34.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (as of July 31, 2024)
Total Net Assets
$501,374,305
Total Number of Portfolio Holdings*
21
Portfolio Turnover Rate
34%
[15]
Holdings [Text Block]
image
Updated Prospectus Web Address https://www.franklintempleton.com/regulatory-fund-documents
Class C  
Shareholder Report [Line Items]  
Fund Name Franklin Multi-Asset Moderate Growth Fund
Class Name Class C
Trading Symbol SCGCX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Franklin Multi-Asset Moderate Growth Fund for the period February 1, 2024, to July 31, 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://www.franklintempleton.com/regulatory-fund-documents. You can also request this information by contacting us at 877-6LM-FUND/656-3863.
Additional Information Phone Number 877-6LM-FUND/656-3863
Additional Information Website https://www.franklintempleton.com/regulatory-fund-documents
Expenses [Text Block]
WHAT WERE THE FUND COSTS FOR THE LAST SIX MONTHS?  (based on a hypothetical $10,000 investment)
Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment†
Class C1
$60
1.16%
[16],[17]
Expenses Paid, Amount $ 60 [16]
Expense Ratio, Percent 1.16% [16]
Net Assets $ 501,374,305
Holdings Count | $ / shares 21 [18]
Investment Company Portfolio Turnover 34.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (as of July 31, 2024)
Total Net Assets
$501,374,305
Total Number of Portfolio Holdings*
21
Portfolio Turnover Rate
34%
[18]
Holdings [Text Block]
image
Updated Prospectus Web Address https://www.franklintempleton.com/regulatory-fund-documents
Class R  
Shareholder Report [Line Items]  
Fund Name Franklin Multi-Asset Moderate Growth Fund
Class Name Class R
Trading Symbol LLMRX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Franklin Multi-Asset Moderate Growth Fund for the period February 1, 2024, to July 31, 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://www.franklintempleton.com/regulatory-fund-documents. You can also request this information by contacting us at 877-6LM-FUND/656-3863.
Additional Information Phone Number 877-6LM-FUND/656-3863
Additional Information Website https://www.franklintempleton.com/regulatory-fund-documents
Expenses [Text Block]
WHAT WERE THE FUND COSTS FOR THE LAST SIX MONTHS?  (based on a hypothetical $10,000 investment)
Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment*,†
Class R1
$42
0.80%
[19],[20],[21]
Expenses Paid, Amount $ 42 [19]
Expense Ratio, Percent 0.80% [19]
Net Assets $ 501,374,305
Holdings Count | $ / shares 21 [22]
Investment Company Portfolio Turnover 34.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (as of July 31, 2024)
Total Net Assets
$501,374,305
Total Number of Portfolio Holdings*
21
Portfolio Turnover Rate
34%
[22]
Holdings [Text Block]
image
Updated Prospectus Web Address https://www.franklintempleton.com/regulatory-fund-documents
Class I  
Shareholder Report [Line Items]  
Fund Name Franklin Multi-Asset Moderate Growth Fund
Class Name Class I
Trading Symbol LLAIX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Franklin Multi-Asset Moderate Growth Fund for the period February 1, 2024, to July 31, 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://www.franklintempleton.com/regulatory-fund-documents. You can also request this information by contacting us at 877-6LM-FUND/656-3863.
Additional Information Phone Number 877-6LM-FUND/656-3863
Additional Information Website https://www.franklintempleton.com/regulatory-fund-documents
Expenses [Text Block]
WHAT WERE THE FUND COSTS FOR THE LAST SIX MONTHS?  (based on a hypothetical $10,000 investment)
Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment†
Class I1
$6
0.12%
[23],[24]
Expenses Paid, Amount $ 6 [23]
Expense Ratio, Percent 0.12% [23]
Net Assets $ 501,374,305
Holdings Count | $ / shares 21 [25]
Investment Company Portfolio Turnover 34.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (as of July 31, 2024)
Total Net Assets
$501,374,305
Total Number of Portfolio Holdings*
21
Portfolio Turnover Rate
34%
[25]
Holdings [Text Block]
image
Updated Prospectus Web Address https://www.franklintempleton.com/regulatory-fund-documents
Class A  
Shareholder Report [Line Items]  
Fund Name Franklin Multi-Asset Conservative Growth Fund
Class Name Class A
Trading Symbol SBBAX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Franklin Multi-Asset Conservative Growth Fund for the period February 1, 2024, to July 31, 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://www.franklintempleton.com/regulatory-fund-documents. You can also request this information by contacting us at 877-6LM-FUND/656-3863.
Additional Information Phone Number 877-6LM-FUND/656-3863
Additional Information Website https://www.franklintempleton.com/regulatory-fund-documents
Expenses [Text Block]
WHAT WERE THE FUND COSTS FOR THE LAST SIX MONTHS?  (based on a hypothetical $10,000 investment)
Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment†
Class A1
$23
0.44%
[26],[27]
Expenses Paid, Amount $ 23 [26]
Expense Ratio, Percent 0.44% [26]
Net Assets $ 291,613,068
Holdings Count | $ / shares 21 [28]
Investment Company Portfolio Turnover 34.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (as of July 31, 2024)
Total Net Assets
$291,613,068
Total Number of Portfolio Holdings*
21
Portfolio Turnover Rate
34%
[28]
Holdings [Text Block]
image
Updated Prospectus Web Address https://www.franklintempleton.com/regulatory-fund-documents
Class C  
Shareholder Report [Line Items]  
Fund Name Franklin Multi-Asset Conservative Growth Fund
Class Name Class C
Trading Symbol SCBCX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Franklin Multi-Asset Conservative Growth Fund for the period February 1, 2024, to July 31, 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://www.franklintempleton.com/regulatory-fund-documents. You can also request this information by contacting us at 877-6LM-FUND/656-3863.
Additional Information Phone Number 877-6LM-FUND/656-3863
Additional Information Website https://www.franklintempleton.com/regulatory-fund-documents
Expenses [Text Block]
WHAT WERE THE FUND COSTS FOR THE LAST SIX MONTHS?  (based on a hypothetical $10,000 investment)
Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment†
Class C1
$62
1.21%
[29],[30]
Expenses Paid, Amount $ 62 [29]
Expense Ratio, Percent 1.21% [29]
Net Assets $ 291,613,068
Holdings Count | $ / shares 21 [31]
Investment Company Portfolio Turnover 34.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (as of July 31, 2024)
Total Net Assets
$291,613,068
Total Number of Portfolio Holdings*
21
Portfolio Turnover Rate
34%
[31]
Holdings [Text Block]
image
Updated Prospectus Web Address https://www.franklintempleton.com/regulatory-fund-documents
Class I  
Shareholder Report [Line Items]  
Fund Name Franklin Multi-Asset Conservative Growth Fund
Class Name Class I
Trading Symbol LMEIX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Franklin Multi-Asset Conservative Growth Fund for the period February 1, 2024, to July 31, 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://www.franklintempleton.com/regulatory-fund-documents. You can also request this information by contacting us at 877-6LM-FUND/656-3863.
Additional Information Phone Number 877-6LM-FUND/656-3863
Additional Information Website https://www.franklintempleton.com/regulatory-fund-documents
Expenses [Text Block]
WHAT WERE THE FUND COSTS FOR THE LAST SIX MONTHS?  (based on a hypothetical $10,000 investment)
Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment†
Class I1
$7
0.13%
[32],[33]
Expenses Paid, Amount $ 7 [32]
Expense Ratio, Percent 0.13% [32]
Net Assets $ 291,613,068
Holdings Count | $ / shares 21 [34]
Investment Company Portfolio Turnover 34.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (as of July 31, 2024)
Total Net Assets
$291,613,068
Total Number of Portfolio Holdings*
21
Portfolio Turnover Rate
34%
[34]
Holdings [Text Block]
image
Updated Prospectus Web Address https://www.franklintempleton.com/regulatory-fund-documents
Class R  
Shareholder Report [Line Items]  
Fund Name Franklin Multi-Asset Conservative Growth Fund
Class Name Class R
Trading Symbol LLARX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Franklin Multi-Asset Conservative Growth Fund for the period February 1, 2024, to July 31, 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://www.franklintempleton.com/regulatory-fund-documents. You can also request this information by contacting us at 877-6LM-FUND/656-3863.
Additional Information Phone Number 877-6LM-FUND/656-3863
Additional Information Website https://www.franklintempleton.com/regulatory-fund-documents
Expenses [Text Block]
WHAT WERE THE FUND COSTS FOR THE LAST SIX MONTHS?  (based on a hypothetical $10,000 investment)
Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment†
Class R1
$40
0.78%
[35],[36]
Expenses Paid, Amount $ 40 [35]
Expense Ratio, Percent 0.78% [35]
Net Assets $ 291,613,068
Holdings Count | $ / shares 21 [37]
Investment Company Portfolio Turnover 34.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (as of July 31, 2024)
Total Net Assets
$291,613,068
Total Number of Portfolio Holdings*
21
Portfolio Turnover Rate
34%
[37]
Holdings [Text Block]
image
Updated Prospectus Web Address https://www.franklintempleton.com/regulatory-fund-documents
Class A  
Shareholder Report [Line Items]  
Fund Name Franklin Multi-Asset Defensive Growth Fund
Class Name Class A
Trading Symbol SBCPX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Franklin Multi-Asset Defensive Growth Fund for the period February 1, 2024, to July 31, 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://www.franklintempleton.com/regulatory-fund-documents. You can also request this information by contacting us at 877-6LM-FUND/656-3863.
Additional Information Phone Number 877-6LM-FUND/656-3863
Additional Information Website https://www.franklintempleton.com/regulatory-fund-documents
Expenses [Text Block]
WHAT WERE THE FUND COSTS FOR THE LAST SIX MONTHS?  (based on a hypothetical $10,000 investment)
Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment†
Class A1
$29
0.57%
[38],[39]
Expenses Paid, Amount $ 29 [38]
Expense Ratio, Percent 0.57% [38]
Net Assets $ 106,701,444
Holdings Count | $ / shares 21 [40]
Investment Company Portfolio Turnover 36.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (as of July 31, 2024)
Total Net Assets
$106,701,444
Total Number of Portfolio Holdings*
21
Portfolio Turnover Rate
36%
[40]
Holdings [Text Block]
image
Updated Prospectus Web Address https://www.franklintempleton.com/regulatory-fund-documents
Class C  
Shareholder Report [Line Items]  
Fund Name Franklin Multi-Asset Defensive Growth Fund
Class Name Class C
Trading Symbol LWLAX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Franklin Multi-Asset Defensive Growth Fund for the period February 1, 2024, to July 31, 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://www.franklintempleton.com/regulatory-fund-documents. You can also request this information by contacting us at 877-6LM-FUND/656-3863.
Additional Information Phone Number 877-6LM-FUND/656-3863
Additional Information Website https://www.franklintempleton.com/regulatory-fund-documents
Expenses [Text Block]
WHAT WERE THE FUND COSTS FOR THE LAST SIX MONTHS?  (based on a hypothetical $10,000 investment)
Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment†
Class C1
$69
1.36%
[41],[42]
Expenses Paid, Amount $ 69 [41]
Expense Ratio, Percent 1.36% [41]
Net Assets $ 106,701,444
Holdings Count | $ / shares 21 [43]
Investment Company Portfolio Turnover 36.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (as of July 31, 2024)
Total Net Assets
$106,701,444
Total Number of Portfolio Holdings*
21
Portfolio Turnover Rate
36%
[43]
Holdings [Text Block]
image
Updated Prospectus Web Address https://www.franklintempleton.com/regulatory-fund-documents
Class C1  
Shareholder Report [Line Items]  
Fund Name Franklin Multi-Asset Defensive Growth Fund
Class Name Class C1
Trading Symbol SBCLX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Franklin Multi-Asset Defensive Growth Fund for the period February 1, 2024, to July 31, 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://www.franklintempleton.com/regulatory-fund-documents. You can also request this information by contacting us at 877-6LM-FUND/656-3863.
Additional Information Phone Number 877-6LM-FUND/656-3863
Additional Information Website https://www.franklintempleton.com/regulatory-fund-documents
Expenses [Text Block]
WHAT WERE THE FUND COSTS FOR THE LAST SIX MONTHS?  (based on a hypothetical $10,000 investment)
Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment*,†
Class C11
$64
1.25%
[44],[45],[46]
Expenses Paid, Amount $ 64 [44]
Expense Ratio, Percent 1.25% [44]
Net Assets $ 106,701,444
Holdings Count | $ / shares 21 [47]
Investment Company Portfolio Turnover 36.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (as of July 31, 2024)
Total Net Assets
$106,701,444
Total Number of Portfolio Holdings*
21
Portfolio Turnover Rate
36%
[47]
Holdings [Text Block]
image
Updated Prospectus Web Address https://www.franklintempleton.com/regulatory-fund-documents
Class I  
Shareholder Report [Line Items]  
Fund Name Franklin Multi-Asset Defensive Growth Fund
Class Name Class I
Trading Symbol LMGIX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Franklin Multi-Asset Defensive Growth Fund for the period February 1, 2024, to July 31, 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://www.franklintempleton.com/regulatory-fund-documents. You can also request this information by contacting us at 877-6LM-FUND/656-3863.
Additional Information Phone Number 877-6LM-FUND/656-3863
Additional Information Website https://www.franklintempleton.com/regulatory-fund-documents
Expenses [Text Block]
WHAT WERE THE FUND COSTS FOR THE LAST SIX MONTHS?  (based on a hypothetical $10,000 investment)
Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment*,†
Class I1
$13
0.25%
[48],[49],[50]
Expenses Paid, Amount $ 13 [48]
Expense Ratio, Percent 0.25% [48]
Net Assets $ 106,701,444
Holdings Count | $ / shares 21 [51]
Investment Company Portfolio Turnover 36.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (as of July 31, 2024)
Total Net Assets
$106,701,444
Total Number of Portfolio Holdings*
21
Portfolio Turnover Rate
36%
[51]
Holdings [Text Block]
image
Updated Prospectus Web Address https://www.franklintempleton.com/regulatory-fund-documents
Class R  
Shareholder Report [Line Items]  
Fund Name Franklin Multi-Asset Defensive Growth Fund
Class Name Class R
Trading Symbol LMLRX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Franklin Multi-Asset Defensive Growth Fund for the period February 1, 2024, to July 31, 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://www.franklintempleton.com/regulatory-fund-documents. You can also request this information by contacting us at 877-6LM-FUND/656-3863.
Additional Information Phone Number 877-6LM-FUND/656-3863
Additional Information Website https://www.franklintempleton.com/regulatory-fund-documents
Expenses [Text Block]
WHAT WERE THE FUND COSTS FOR THE LAST SIX MONTHS?  (based on a hypothetical $10,000 investment)
Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment*,†
Class R1
$41
0.80%
[52],[53],[54]
Expenses Paid, Amount $ 41 [52]
Expense Ratio, Percent 0.80% [52]
Net Assets $ 106,701,444
Holdings Count | $ / shares 21 [55]
Investment Company Portfolio Turnover 36.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (as of July 31, 2024)
Total Net Assets
$106,701,444
Total Number of Portfolio Holdings*
21
Portfolio Turnover Rate
36%
[55]
Holdings [Text Block]
image
Updated Prospectus Web Address https://www.franklintempleton.com/regulatory-fund-documents
[1]
1 Excludes fees and expenses of the underlying funds in which the Fund invests.
[2]
† Annualized.
[3]
* Does not include derivatives, except purchased options, if any.
[4]
1 Excludes fees and expenses of the underlying funds in which the Fund invests.
[5]
† Annualized.
[6]
* Does not include derivatives, except purchased options, if any.
[7]
1 Excludes fees and expenses of the underlying funds in which the Fund invests.
[8]
† Annualized.
[9]
* Does not include derivatives, except purchased options, if any.
[10]
1 Excludes fees and expenses of the underlying funds in which the Fund invests.
[11]
† Annualized.
[12]
* Does not include derivatives, except purchased options, if any.
[13]
1 Excludes fees and expenses of the underlying funds in which the Fund invests.
[14]
† Annualized.
[15]
* Does not include derivatives, except purchased options, if any.
[16]
1 Excludes fees and expenses of the underlying funds in which the Fund invests.
[17]
† Annualized.
[18]
* Does not include derivatives, except purchased options, if any.
[19]
1 Excludes fees and expenses of the underlying funds in which the Fund invests.
[20]
* Reflects fee waivers and/or expense reimbursements, without which expenses would have been higher.
[21]
† Annualized.
[22]
* Does not include derivatives, except purchased options, if any.
[23]
1 Excludes fees and expenses of the underlying funds in which the Fund invests.
[24]
† Annualized.
[25]
* Does not include derivatives, except purchased options, if any.
[26]
1 Excludes fees and expenses of the underlying funds in which the Fund invests.
[27]
† Annualized.
[28]
* Does not include derivatives, except purchased options, if any.
[29]
1 Excludes fees and expenses of the underlying funds in which the Fund invests.
[30]
† Annualized.
[31]
* Does not include derivatives, except purchased options, if any.
[32]
1 Excludes fees and expenses of the underlying funds in which the Fund invests.
[33]
† Annualized.
[34]
* Does not include derivatives, except purchased options, if any.
[35]
1 Excludes fees and expenses of the underlying funds in which the Fund invests.
[36]
† Annualized.
[37]
* Does not include derivatives, except purchased options, if any.
[38]
1 Excludes fees and expenses of the underlying funds in which the Fund invests.
[39]
† Annualized.
[40]
* Does not include derivatives, except purchased options, if any.
[41]
1 Excludes fees and expenses of the underlying funds in which the Fund invests.
[42]
† Annualized.
[43]
* Does not include derivatives, except purchased options, if any.
[44]
1 Excludes fees and expenses of the underlying funds in which the Fund invests.
[45]
* Reflects fee waivers and/or expense reimbursements, without which expenses would have been higher.
[46]
† Annualized.
[47]
* Does not include derivatives, except purchased options, if any.
[48]
1 Excludes fees and expenses of the underlying funds in which the Fund invests.
[49]
* Reflects fee waivers and/or expense reimbursements, without which expenses would have been higher.
[50]
† Annualized.
[51]
* Does not include derivatives, except purchased options, if any.
[52]
1 Excludes fees and expenses of the underlying funds in which the Fund invests.
[53]
* Reflects fee waivers and/or expense reimbursements, without which expenses would have been higher.
[54]
† Annualized.
[55]
* Does not include derivatives, except purchased options, if any.