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Shareholder Report
 6 Months Ended
Jul. 31, 2025
USD ($)
shares
Shareholder Report [Line Items]  
Document Type N-CSRS
Amendment Flag false
Registrant Name Fidelity New York Municipal Trust
Entity Central Index Key 0000718581
Entity Investment Company Type N-1A
Document Period End Date Jul. 31, 2025
Fidelity New York Municipal Income Fund  
Shareholder Report [Line Items]  
Fund Name Fidelity® New York Municipal Income Fund
Class Name Fidelity® New York Municipal Income Fund
Trading Symbol FTFMX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Fidelity® New York Municipal Income Fund for the period February 1, 2025 to July 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 fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-8544 or by sending an e-mail to fidfunddocuments@fidelity.com.
Additional Information Phone Number 1-800-544-8544
Additional Information Email fidfunddocuments@fidelity.com
Additional Information Website fundresearch.fidelity.com/prospectus/sec
Expenses [Text Block] What were your Fund costs for the last six months?
(based on hypothetical $10,000 investment)
 
 
 
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
 
Fidelity® New York Municipal Income Fund 
$ 22 
0.45%
  
Expenses Paid, Amount $ 22
Expense Ratio, Percent 0.45%
Net Assets $ 1,218,779,432
Holdings Count | shares 417
Investment Company Portfolio Turnover 14.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of July 31, 2025)
 
KEY FACTS 
  
  
Fund Size
$1,218,779,432
  
Number of Holdings
417
  
Portfolio Turnover
14%
  
Holdings [Text Block]   REVENUE SOURCES (% of Fund's net assets) Transportation 25.6   Special Tax 25.1   General Obligations 15.9   Health Care 8.6   Education 8.3   Housing 6.5   Others(Individually Less Than 5%) 7.5   97.5       AAA 0.9 AA 58.2 A 21.9 BBB 12.8 BB 0.8 B 1.2 Not Rated 1.7 Short-Term Investments and Net Other Assets (Liabilities) 2.5 QUALITY DIVERSIFICATION (% of Fund's net assets)     AAA - 0.9                                  AA - 58.2                                  A - 21.9                                   BBB - 12.8                                 BB - 0.8                                   B - 1.2                                    Not Rated - 1.7                            Short-Term Investments and Net Other Assets (Liabilities) - 2.5   We have used ratings from Moody's Investors Service, Inc. Where Moody's® ratings are not available, we have used S&P® ratings. All ratings are as of the date indicated and do not reflect subsequent changes.        
Fidelity Advisor New York Municipal Income Fund - Class Z  
Shareholder Report [Line Items]  
Fund Name Fidelity® New York Municipal Income Fund
Class Name Fidelity Advisor® New York Municipal Income Fund Class Z
Trading Symbol FIJAX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Fidelity® New York Municipal Income Fund for the period February 1, 2025 to July 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 fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com.
Additional Information Phone Number 1-877-208-0098
Additional Information Email fidfunddocuments@fidelity.com
Additional Information Website fundresearch.fidelity.com/prospectus/sec
Expenses [Text Block] What were your Fund costs for the last six months?
(based on hypothetical $10,000 investment)
 
 
 
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
 
Class Z 
$ 21 
0.42%
  
Expenses Paid, Amount $ 21
Expense Ratio, Percent 0.42%
Net Assets $ 1,218,779,432
Holdings Count | shares 417
Investment Company Portfolio Turnover 14.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of July 31, 2025)
 
KEY FACTS 
  
  
Fund Size
$1,218,779,432
  
Number of Holdings
417
  
Portfolio Turnover
14%
  
Holdings [Text Block]   REVENUE SOURCES (% of Fund's net assets) Transportation 25.6   Special Tax 25.1   General Obligations 15.9   Health Care 8.6   Education 8.3   Housing 6.5   Others(Individually Less Than 5%) 7.5   97.5       AAA 0.9 AA 58.2 A 21.9 BBB 12.8 BB 0.8 B 1.2 Not Rated 1.7 Short-Term Investments and Net Other Assets (Liabilities) 2.5 QUALITY DIVERSIFICATION (% of Fund's net assets)     AAA - 0.9                                  AA - 58.2                                  A - 21.9                                   BBB - 12.8                                 BB - 0.8                                   B - 1.2                                    Not Rated - 1.7                            Short-Term Investments and Net Other Assets (Liabilities) - 2.5   We have used ratings from Moody's Investors Service, Inc. Where Moody's® ratings are not available, we have used S&P® ratings. All ratings are as of the date indicated and do not reflect subsequent changes.        
Fidelity Advisor New York Municipal Income Fund - Class M  
Shareholder Report [Line Items]  
Fund Name Fidelity® New York Municipal Income Fund
Class Name Fidelity Advisor® New York Municipal Income Fund Class M
Trading Symbol FNYPX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Fidelity® New York Municipal Income Fund for the period February 1, 2025 to July 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 fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com.
Additional Information Phone Number 1-877-208-0098
Additional Information Email fidfunddocuments@fidelity.com
Additional Information Website fundresearch.fidelity.com/prospectus/sec
Expenses [Text Block] What were your Fund costs for the last six months?
(based on hypothetical $10,000 investment)
 
 
 
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
 
Class M 
$ 36 
0.73%
  
Expenses Paid, Amount $ 36
Expense Ratio, Percent 0.73%
Net Assets $ 1,218,779,432
Holdings Count | shares 417
Investment Company Portfolio Turnover 14.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of July 31, 2025)
 
KEY FACTS 
  
  
Fund Size
$1,218,779,432
  
Number of Holdings
417
  
Portfolio Turnover
14%
  
Holdings [Text Block]   REVENUE SOURCES (% of Fund's net assets) Transportation 25.6   Special Tax 25.1   General Obligations 15.9   Health Care 8.6   Education 8.3   Housing 6.5   Others(Individually Less Than 5%) 7.5   97.5       AAA 0.9 AA 58.2 A 21.9 BBB 12.8 BB 0.8 B 1.2 Not Rated 1.7 Short-Term Investments and Net Other Assets (Liabilities) 2.5 QUALITY DIVERSIFICATION (% of Fund's net assets)     AAA - 0.9                                  AA - 58.2                                  A - 21.9                                   BBB - 12.8                                 BB - 0.8                                   B - 1.2                                    Not Rated - 1.7                            Short-Term Investments and Net Other Assets (Liabilities) - 2.5   We have used ratings from Moody's Investors Service, Inc. Where Moody's® ratings are not available, we have used S&P® ratings. All ratings are as of the date indicated and do not reflect subsequent changes.        
Fidelity Advisor New York Municipal Income Fund - Class I  
Shareholder Report [Line Items]  
Fund Name Fidelity® New York Municipal Income Fund
Class Name Fidelity Advisor® New York Municipal Income Fund Class I
Trading Symbol FEMIX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Fidelity® New York Municipal Income Fund for the period February 1, 2025 to July 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 fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com.
Additional Information Phone Number 1-877-208-0098
Additional Information Email fidfunddocuments@fidelity.com
Additional Information Website fundresearch.fidelity.com/prospectus/sec
Expenses [Text Block] What were your Fund costs for the last six months?
(based on hypothetical $10,000 investment)
 
 
 
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
 
Class I 
$ 26 
0.54%
  
Expenses Paid, Amount $ 26
Expense Ratio, Percent 0.54%
Net Assets $ 1,218,779,432
Holdings Count | shares 417
Investment Company Portfolio Turnover 14.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of July 31, 2025)
 
KEY FACTS 
  
  
Fund Size
$1,218,779,432
  
Number of Holdings
417
  
Portfolio Turnover
14%
  
Holdings [Text Block]   REVENUE SOURCES (% of Fund's net assets) Transportation 25.6   Special Tax 25.1   General Obligations 15.9   Health Care 8.6   Education 8.3   Housing 6.5   Others(Individually Less Than 5%) 7.5   97.5       AAA 0.9 AA 58.2 A 21.9 BBB 12.8 BB 0.8 B 1.2 Not Rated 1.7 Short-Term Investments and Net Other Assets (Liabilities) 2.5 QUALITY DIVERSIFICATION (% of Fund's net assets)     AAA - 0.9                                  AA - 58.2                                  A - 21.9                                   BBB - 12.8                                 BB - 0.8                                   B - 1.2                                    Not Rated - 1.7                            Short-Term Investments and Net Other Assets (Liabilities) - 2.5   We have used ratings from Moody's Investors Service, Inc. Where Moody's® ratings are not available, we have used S&P® ratings. All ratings are as of the date indicated and do not reflect subsequent changes.        
Fidelity Advisor New York Municipal Income Fund - Class C  
Shareholder Report [Line Items]  
Fund Name Fidelity® New York Municipal Income Fund
Class Name Fidelity Advisor® New York Municipal Income Fund Class C
Trading Symbol FNYCX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Fidelity® New York Municipal Income Fund for the period February 1, 2025 to July 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 fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com.
Additional Information Phone Number 1-877-208-0098
Additional Information Email fidfunddocuments@fidelity.com
Additional Information Website fundresearch.fidelity.com/prospectus/sec
Expenses [Text Block] What were your Fund costs for the last six months?
(based on hypothetical $10,000 investment)
 
 
 
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
 
Class C 
$ 72 
1.47%
  
Expenses Paid, Amount $ 72
Expense Ratio, Percent 1.47%
Net Assets $ 1,218,779,432
Holdings Count | shares 417
Investment Company Portfolio Turnover 14.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of July 31, 2025)
 
KEY FACTS 
  
  
Fund Size
$1,218,779,432
  
Number of Holdings
417
  
Portfolio Turnover
14%
  
Holdings [Text Block]   REVENUE SOURCES (% of Fund's net assets) Transportation 25.6   Special Tax 25.1   General Obligations 15.9   Health Care 8.6   Education 8.3   Housing 6.5   Others(Individually Less Than 5%) 7.5   97.5       AAA 0.9 AA 58.2 A 21.9 BBB 12.8 BB 0.8 B 1.2 Not Rated 1.7 Short-Term Investments and Net Other Assets (Liabilities) 2.5 QUALITY DIVERSIFICATION (% of Fund's net assets)     AAA - 0.9                                  AA - 58.2                                  A - 21.9                                   BBB - 12.8                                 BB - 0.8                                   B - 1.2                                    Not Rated - 1.7                            Short-Term Investments and Net Other Assets (Liabilities) - 2.5   We have used ratings from Moody's Investors Service, Inc. Where Moody's® ratings are not available, we have used S&P® ratings. All ratings are as of the date indicated and do not reflect subsequent changes.        
Fidelity Advisor New York Municipal Income Fund - Class A  
Shareholder Report [Line Items]  
Fund Name Fidelity® New York Municipal Income Fund
Class Name Fidelity Advisor® New York Municipal Income Fund Class A
Trading Symbol FNMAX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Fidelity® New York Municipal Income Fund for the period February 1, 2025 to July 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 fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com.
Additional Information Phone Number 1-877-208-0098
Additional Information Email fidfunddocuments@fidelity.com
Additional Information Website fundresearch.fidelity.com/prospectus/sec
Expenses [Text Block] What were your Fund costs for the last six months?
(based on hypothetical $10,000 investment)
 
 
 
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
 
Class A 
$ 38 
0.77%
  
Expenses Paid, Amount $ 38
Expense Ratio, Percent 0.77%
Net Assets $ 1,218,779,432
Holdings Count | shares 417
Investment Company Portfolio Turnover 14.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of July 31, 2025)
 
KEY FACTS 
  
  
Fund Size
$1,218,779,432
  
Number of Holdings
417
  
Portfolio Turnover
14%
  
Holdings [Text Block]   REVENUE SOURCES (% of Fund's net assets) Transportation 25.6   Special Tax 25.1   General Obligations 15.9   Health Care 8.6   Education 8.3   Housing 6.5   Others(Individually Less Than 5%) 7.5   97.5       AAA 0.9 AA 58.2 A 21.9 BBB 12.8 BB 0.8 B 1.2 Not Rated 1.7 Short-Term Investments and Net Other Assets (Liabilities) 2.5 QUALITY DIVERSIFICATION (% of Fund's net assets)     AAA - 0.9                                  AA - 58.2                                  A - 21.9                                   BBB - 12.8                                 BB - 0.8                                   B - 1.2                                    Not Rated - 1.7                            Short-Term Investments and Net Other Assets (Liabilities) - 2.5   We have used ratings from Moody's Investors Service, Inc. Where Moody's® ratings are not available, we have used S&P® ratings. All ratings are as of the date indicated and do not reflect subsequent changes.