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Shareholder Report
 6 Months Ended
Mar. 31, 2025
USD ($)
$ / shares
Shareholder Report [Line Items]  
Document Type N-CSRS
Amendment Flag false
Registrant Name Franklin New York Tax-Free Trust
Entity Central Index Key 0000798523
Entity Investment Company Type N-1A
Document Period End Date Mar. 31, 2025
Class A  
Shareholder Report [Line Items]  
Fund Name Franklin New York Intermediate-Term Tax-Free Income Fund
Class Name Class A
Trading Symbol FKNQX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Franklin New York Intermediate-Term Tax-Free Income Fund for the period October 1, 2024, to March 31, 2025.
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 (800) DIAL BEN/342-5236.
Additional Information Phone Number (800) DIAL BEN/342-5236
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 A
$43
0.87%
[1]
Expenses Paid, Amount $ 43
Expense Ratio, Percent 0.87%
Net Assets $ 517,354,041
Holdings Count | $ / shares 178 [2]
Investment Company Portfolio Turnover 7.73%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (as of March 31, 2025)
Total Net Assets
$517,354,041
Total Number of Portfolio Holdings*
178
Portfolio Turnover Rate
7.73%
[2]
Holdings [Text Block]
image
Updated Prospectus Web Address https://www.franklintempleton.com/regulatory-fund-documents
Class A1  
Shareholder Report [Line Items]  
Fund Name Franklin New York Intermediate-Term Tax-Free Income Fund
Class Name Class A1
Trading Symbol FKNIX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Franklin New York Intermediate-Term Tax-Free Income Fund for the period October 1, 2024, to March 31, 2025.
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 (800) DIAL BEN/342-5236.
Additional Information Phone Number (800) DIAL BEN/342-5236
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
$36
0.72%
[3]
Expenses Paid, Amount $ 36
Expense Ratio, Percent 0.72%
Net Assets $ 517,354,041
Holdings Count | $ / shares 178 [4]
Investment Company Portfolio Turnover 7.73%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (as of March 31, 2025)
Total Net Assets
$517,354,041
Total Number of Portfolio Holdings*
178
Portfolio Turnover Rate
7.73%
[4]
Holdings [Text Block]
image
Updated Prospectus Web Address https://www.franklintempleton.com/regulatory-fund-documents
Class C  
Shareholder Report [Line Items]  
Fund Name Franklin New York Intermediate-Term Tax-Free Income Fund
Class Name Class C
Trading Symbol FKNCX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Franklin New York Intermediate-Term Tax-Free Income Fund for the period October 1, 2024, to March 31, 2025.
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 (800) DIAL BEN/342-5236.
Additional Information Phone Number (800) DIAL BEN/342-5236
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 C
$63
1.27%
[5]
Expenses Paid, Amount $ 63
Expense Ratio, Percent 1.27%
Net Assets $ 517,354,041
Holdings Count | $ / shares 178 [6]
Investment Company Portfolio Turnover 7.73%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (as of March 31, 2025)
Total Net Assets
$517,354,041
Total Number of Portfolio Holdings*
178
Portfolio Turnover Rate
7.73%
[6]
Holdings [Text Block]
image
Updated Prospectus Web Address https://www.franklintempleton.com/regulatory-fund-documents
Class R6  
Shareholder Report [Line Items]  
Fund Name Franklin New York Intermediate-Term Tax-Free Income Fund
Class Name Class R6
Trading Symbol FKNRX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Franklin New York Intermediate-Term Tax-Free Income Fund for the period October 1, 2024, to March 31, 2025.
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 (800) DIAL BEN/342-5236.
Additional Information Phone Number (800) DIAL BEN/342-5236
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 R6
$27
0.55%
[7]
Expenses Paid, Amount $ 27
Expense Ratio, Percent 0.55%
Net Assets $ 517,354,041
Holdings Count | $ / shares 178 [8]
Investment Company Portfolio Turnover 7.73%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (as of March 31, 2025)
Total Net Assets
$517,354,041
Total Number of Portfolio Holdings*
178
Portfolio Turnover Rate
7.73%
[8]
Holdings [Text Block]
image
Updated Prospectus Web Address https://www.franklintempleton.com/regulatory-fund-documents
Advisor Class  
Shareholder Report [Line Items]  
Fund Name Franklin New York Intermediate-Term Tax-Free Income Fund
Class Name Advisor Class
Trading Symbol FNYZX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Franklin New York Intermediate-Term Tax-Free Income Fund for the period October 1, 2024, to March 31, 2025.
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 (800) DIAL BEN/342-5236.
Additional Information Phone Number (800) DIAL BEN/342-5236
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†
Advisor Class
$31
0.62%
[9]
Expenses Paid, Amount $ 31
Expense Ratio, Percent 0.62%
Net Assets $ 517,354,041
Holdings Count | $ / shares 178 [10]
Investment Company Portfolio Turnover 7.73%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (as of March 31, 2025)
Total Net Assets
$517,354,041
Total Number of Portfolio Holdings*
178
Portfolio Turnover Rate
7.73%
[10]
Holdings [Text Block]
image
Updated Prospectus Web Address https://www.franklintempleton.com/regulatory-fund-documents
[1]
† Annualized.
[2]
* Does not include derivatives, except purchased options, if any.  
[3]
† Annualized.
[4]
* Does not include derivatives, except purchased options, if any.  
[5]
† Annualized.
[6]
* Does not include derivatives, except purchased options, if any.  
[7]
† Annualized.
[8]
* Does not include derivatives, except purchased options, if any.  
[9]
† Annualized.
[10]
* Does not include derivatives, except purchased options, if any.