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Shareholder Report
 6 Months Ended
May 31, 2025
USD ($)
Holding
Shareholder Report [Line Items]  
Document Type N-CSRS
Amendment Flag false
Registrant Name BNY Mellon New York AMT-Free Municipal Bond Fund
Entity Central Index Key 0000797920
Entity Investment Company Type N-1A
Document Period End Date May 31, 2025
C000000142 [Member]  
Shareholder Report [Line Items]  
Fund Name BNY Mellon New York AMT-Free Municipal Bond Fund
Class Name Class A
Trading Symbol PSNYX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about BNY Mellon New York AMT-Free Municipal Bond Fund (the “Fund”) for the period of December 1, 2024 to May 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 bny.com/investments/literaturecenter. You can also request this information by calling 1-800-373-9387 (inside the U.S. only) or by sending an e-mail request to info@bny.com.
Additional Information Phone Number 1-800-373-9387
Additional Information Email info@bny.com
Additional Information Website bny.com/investments/literaturecenter
Expenses [Text Block]
What were the Fund’s costs for the last six months ?
(based on a hypothetical $10,000 investment)
Share Class Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment
Class A $38 0.78%*
*
Annualized.
Expenses Paid, Amount $ 38
Expense Ratio, Percent 0.78% [1]
Net Assets $ 862,000,000
Holdings Count | Holding 223
Investment Company Portfolio Turnover 4.07%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (AS OF 5/31/25 )

Fund Size (Millions)
Number of Holdings
Portfolio Turnover
$862 223 4.07%
Not FDIC Insured. Not Bank-Guaranteed. May Lose Value
Holdings [Text Block]
Portfolio Holdings (as of 5/31/25 )
Sector Allocation (Based on Net Assets)
Graphical Representation - Top N Holdings Chart
C000000144 [Member]  
Shareholder Report [Line Items]  
Fund Name BNY Mellon New York AMT-Free Municipal Bond Fund
Class Name Class C
Trading Symbol PNYCX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about BNY Mellon New York AMT-Free Municipal Bond Fund (the “Fund”) for the period of December 1, 2024 to May 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 bny.com/investments/literaturecenter. You can also request this information by calling 1-800-373-9387 (inside the U.S. only) or by sending an e-mail request to info@bny.com.
Additional Information Phone Number 1-800-373-9387
Additional Information Email info@bny.com
Additional Information Website bny.com/investments/literaturecenter
Expenses [Text Block]
What were the Fund’s costs for the last six months ?
(based on a hypothetical $10,000 investment)
Share Class Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment
Class C $82 1.67%*
*
Annualized.
Expenses Paid, Amount $ 82
Expense Ratio, Percent 1.67% [2]
Net Assets $ 862,000,000
Holdings Count | Holding 223
Investment Company Portfolio Turnover 4.07%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (AS OF 5/31/25 )

Fund Size (Millions)
Number of Holdings
Portfolio Turnover
$862 223 4.07%
Not FDIC Insured. Not Bank-Guaranteed. May Lose Value
Holdings [Text Block]
Portfolio Holdings (as of 5/31/25 )
Sector Allocation (Based on Net Assets)
Graphical Representation - Top N Holdings Chart
C000073393 [Member]  
Shareholder Report [Line Items]  
Fund Name BNY Mellon New York AMT-Free Municipal Bond Fund
Class Name Class I
Trading Symbol DNYIX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about BNY Mellon New York AMT-Free Municipal Bond Fund (the “Fund”) for the period of December 1, 2024 to May 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 bny.com/investments/literaturecenter. You can also request this information by calling 1-800-373-9387 (inside the U.S. only) or by sending an e-mail request to info@bny.com.
Additional Information Phone Number 1-800-373-9387
Additional Information Email info@bny.com
Additional Information Website bny.com/investments/literaturecenter
Expenses [Text Block]
What were the Fund’s costs for the last six months ?
(based on a hypothetical $10,000 investment)
Share Class Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment
Class I $26 0.53%*
*
Annualized.
Expenses Paid, Amount $ 26
Expense Ratio, Percent 0.53% [3]
Net Assets $ 862,000,000
Holdings Count | Holding 223
Investment Company Portfolio Turnover 4.07%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (AS OF 5/31/25 )

Fund Size (Millions)
Number of Holdings
Portfolio Turnover
$862 223 4.07%
Not FDIC Insured. Not Bank-Guaranteed. May Lose Value
Holdings [Text Block]
Portfolio Holdings (as of 5/31/25 )
Sector Allocation (Based on Net Assets)
Graphical Representation - Top N Holdings Chart
C000130310 [Member]  
Shareholder Report [Line Items]  
Fund Name BNY Mellon New York AMT-Free Municipal Bond Fund
Class Name Class Y
Trading Symbol DNYYX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about BNY Mellon New York AMT-Free Municipal Bond Fund (the “Fund”) for the period of December 1, 2024 to May 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 bny.com/investments/literaturecenter. You can also request this information by calling 1-800-373-9387 (inside the U.S. only) or by sending an e-mail request to info@bny.com.
Additional Information Phone Number 1-800-373-9387
Additional Information Email info@bny.com
Additional Information Website bny.com/investments/literaturecenter
Expenses [Text Block]
What were the Fund’s costs for the last six months ?
(based on a hypothetical $10,000 investment)
Share Class Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment
Class Y $25 0.50%*
*
Annualized.
Expenses Paid, Amount $ 25
Expense Ratio, Percent 0.50% [4]
Net Assets $ 862,000,000
Holdings Count | Holding 223
Investment Company Portfolio Turnover 4.07%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (AS OF 5/31/25 )

Fund Size (Millions)
Number of Holdings
Portfolio Turnover
$862 223 4.07%
Not FDIC Insured. Not Bank-Guaranteed. May Lose Value
Holdings [Text Block]
Portfolio Holdings (as of 5/31/25 )
Sector Allocation (Based on Net Assets)
Graphical Representation - Top N Holdings Chart
C000246537 [Member]  
Shareholder Report [Line Items]  
Fund Name BNY Mellon New York AMT-Free Municipal Bond Fund
Class Name Class Z
Trading Symbol DNYAX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about BNY Mellon New York AMT-Free Municipal Bond Fund (the “Fund”) for the period of December 1, 2024 to May 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 bny.com/investments/literaturecenter. You can also request this information by calling 1-800-373-9387 (inside the U.S. only) or by sending an e-mail request to info@bny.com.
Material Fund Change Notice [Text Block]
This report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number 1-800-373-9387
Additional Information Email info@bny.com
Additional Information Website bny.com/investments/literaturecenter
Expenses [Text Block]
What were the Fund’s costs for the last six months ?
(based on a hypothetical $10,000 investment)
Share Class Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment
Class Z $31 0.63%*
*
Annualized.
Expenses Paid, Amount $ 31
Expense Ratio, Percent 0.63% [5]
Material Change Date Mar. 29, 2025
Net Assets $ 862,000,000
Holdings Count | Holding 223
Investment Company Portfolio Turnover 4.07%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (AS OF 5/31/25 )

Fund Size (Millions)
Number of Holdings
Portfolio Turnover
$862 223 4.07%
Not FDIC Insured. Not Bank-Guaranteed. May Lose Value
Holdings [Text Block]
Portfolio Holdings (as of 5/31/25 )
Sector Allocation (Based on Net Assets)
Graphical Representation - Top N Holdings Chart
Material Fund Change [Text Block]
How has the Fund changed?
  • Effective March 29, 2025, BNY Mellon Investment Adviser, Inc. terminated the direct expenses fee waiver on Class Z shares of .55% of the value of the Fund’s average daily net assets.
This is a summary of certain changes to the Fund since December 1, 2024 . For more complete information, you may review the Fund’s current prospectus dated March 31, 2025 at bny.com/investments/literaturecenter  or upon request at 1-800-373-9387.
Material Fund Change Expenses [Text Block]
Effective March 29, 2025, BNY Mellon Investment Adviser, Inc. terminated the direct expenses fee waiver on Class Z shares of .55% of the value of the Fund’s average daily net assets.
Summary of Change Legend [Text Block]
This is a summary of certain changes to the Fund since December 1, 2024 . For more complete information, you may review the Fund’s current prospectus dated March 31, 2025 at bny.com/investments/literaturecenter  or upon request at 1-800-373-9387.
Updated Prospectus Phone Number 1-800-373-9387
Updated Prospectus Web Address bny.com/investments/literaturecenter
[1] Annualized.
[2] Annualized.
[3] Annualized.
[4] Annualized.
[5] Annualized.