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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 Fidelity New York Municipal Trust
Entity Central Index Key 0000718581
Entity Investment Company Type N-1A
Document Period End Date Jul. 31, 2024
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, 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 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 $ 1,224,414,030
Holdings Count | shares 386
Investment Company Portfolio Turnover 8.00%
Additional Fund Statistics [Text Block] Key Fund Statistics  
(as of July 31, 2024)
 
KEY FACTS 
  
  
Fund Size
$1,224,414,030
 
  
Number of Holdings
386
 
  
Portfolio Turnover
8%
 
  
Holdings [Text Block]   REVENUE SOURCES (% of Fund's net assets) Transportation 27.1   Special Tax 22.2   Education 15.0   General Obligations 12.1   Health Care 9.2   Housing 6.4   Others(Individually Less Than 5%) 8.0   100.0       AAA 0.8 AA 52.6 A 27.6 BBB 13.3 BB 0.7 CCC,CC,C 1.2 Not Rated 2.7 Short-Term Investments and Net Other Assets (Liabilities) 1.1 QUALITY DIVERSIFICATION (% of Fund's net assets)     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, 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 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 
$ 27 
0.53%
  
Expenses Paid, Amount $ 27
Expense Ratio, Percent 0.53%
Net Assets $ 1,224,414,030
Holdings Count | shares 386
Investment Company Portfolio Turnover 8.00%
Additional Fund Statistics [Text Block] Key Fund Statistics  
(as of July 31, 2024)
 
KEY FACTS 
  
  
Fund Size
$1,224,414,030
 
  
Number of Holdings
386
 
  
Portfolio Turnover
8%
 
  
Holdings [Text Block]   REVENUE SOURCES (% of Fund's net assets) Transportation 27.1   Special Tax 22.2   Education 15.0   General Obligations 12.1   Health Care 9.2   Housing 6.4   Others(Individually Less Than 5%) 8.0   100.0       AAA 0.8 AA 52.6 A 27.6 BBB 13.3 BB 0.7 CCC,CC,C 1.2 Not Rated 2.7 Short-Term Investments and Net Other Assets (Liabilities) 1.1 QUALITY DIVERSIFICATION (% of Fund's net assets)     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 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, 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 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 
$ 23 
0.45%
  
Expenses Paid, Amount $ 23
Expense Ratio, Percent 0.45%
Net Assets $ 1,224,414,030
Holdings Count | shares 386
Investment Company Portfolio Turnover 8.00%
Additional Fund Statistics [Text Block] Key Fund Statistics  
(as of July 31, 2024)
 
KEY FACTS 
  
  
Fund Size
$1,224,414,030
 
  
Number of Holdings
386
 
  
Portfolio Turnover
8%
 
  
Holdings [Text Block]   REVENUE SOURCES (% of Fund's net assets) Transportation 27.1   Special Tax 22.2   Education 15.0   General Obligations 12.1   Health Care 9.2   Housing 6.4   Others(Individually Less Than 5%) 8.0   100.0       AAA 0.8 AA 52.6 A 27.6 BBB 13.3 BB 0.7 CCC,CC,C 1.2 Not Rated 2.7 Short-Term Investments and Net Other Assets (Liabilities) 1.1 QUALITY DIVERSIFICATION (% of Fund's net assets)     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, 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 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 
0.43%
  
Expenses Paid, Amount $ 21
Expense Ratio, Percent 0.43%
Net Assets $ 1,224,414,030
Holdings Count | shares 386
Investment Company Portfolio Turnover 8.00%
Additional Fund Statistics [Text Block] Key Fund Statistics  
(as of July 31, 2024)
 
KEY FACTS 
  
  
Fund Size
$1,224,414,030
 
  
Number of Holdings
386
 
  
Portfolio Turnover
8%
 
  
Holdings [Text Block]   REVENUE SOURCES (% of Fund's net assets) Transportation 27.1   Special Tax 22.2   Education 15.0   General Obligations 12.1   Health Care 9.2   Housing 6.4   Others(Individually Less Than 5%) 8.0   100.0       AAA 0.8 AA 52.6 A 27.6 BBB 13.3 BB 0.7 CCC,CC,C 1.2 Not Rated 2.7 Short-Term Investments and Net Other Assets (Liabilities) 1.1 QUALITY DIVERSIFICATION (% of Fund's net assets)     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, 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 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 
0.72%
  
Expenses Paid, Amount $ 36
Expense Ratio, Percent 0.72%
Net Assets $ 1,224,414,030
Holdings Count | shares 386
Investment Company Portfolio Turnover 8.00%
Additional Fund Statistics [Text Block] Key Fund Statistics  
(as of July 31, 2024)
 
KEY FACTS 
  
  
Fund Size
$1,224,414,030
 
  
Number of Holdings
386
 
  
Portfolio Turnover
8%
 
  
Holdings [Text Block]   REVENUE SOURCES (% of Fund's net assets) Transportation 27.1   Special Tax 22.2   Education 15.0   General Obligations 12.1   Health Care 9.2   Housing 6.4   Others(Individually Less Than 5%) 8.0   100.0       AAA 0.8 AA 52.6 A 27.6 BBB 13.3 BB 0.7 CCC,CC,C 1.2 Not Rated 2.7 Short-Term Investments and Net Other Assets (Liabilities) 1.1 QUALITY DIVERSIFICATION (% of Fund's net assets)     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, 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 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 
$ 73 
1.47%
  
Expenses Paid, Amount $ 73
Expense Ratio, Percent 1.47%
Net Assets $ 1,224,414,030
Holdings Count | shares 386
Investment Company Portfolio Turnover 8.00%
Additional Fund Statistics [Text Block] Key Fund Statistics  
(as of July 31, 2024)
 
KEY FACTS 
  
  
Fund Size
$1,224,414,030
 
  
Number of Holdings
386
 
  
Portfolio Turnover
8%
 
  
Holdings [Text Block]   REVENUE SOURCES (% of Fund's net assets) Transportation 27.1   Special Tax 22.2   Education 15.0   General Obligations 12.1   Health Care 9.2   Housing 6.4   Others(Individually Less Than 5%) 8.0   100.0       AAA 0.8 AA 52.6 A 27.6 BBB 13.3 BB 0.7 CCC,CC,C 1.2 Not Rated 2.7 Short-Term Investments and Net Other Assets (Liabilities) 1.1 QUALITY DIVERSIFICATION (% of Fund's net assets)     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.