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Shareholder Report
 6 Months Ended
Feb. 28, 2025
USD ($)
Holding
Shareholder Report [Line Items]  
Document Type N-CSRS
Amendment Flag false
Registrant Name BNY Mellon Municipal Funds, Inc.
Entity Central Index Key 0000878092
Entity Investment Company Type N-1A
Document Period End Date Feb. 28, 2025
C000000815 [Member]  
Shareholder Report [Line Items]  
Fund Name BNY Mellon AMT-Free Municipal Bond Fund
Class Name Class A
Trading Symbol DMUAX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about BNY Mellon AMT-Free Municipal Bond Fund (the “Fund”) for the period of September 1, 2024 to February 28, 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 $33 0.67%*
*
Annualized.
Expenses Paid, Amount $ 33
Expense Ratio, Percent 0.67% [1]
Net Assets $ 1,913,000,000
Holdings Count | Holding 547
Investment Company Portfolio Turnover 5.25%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (AS OF 2/28/25 )

Fund Size (Millions)
Number of Holdings
Portfolio Turnover
$1,913 547 5.25%
Not FDIC Insured. Not Bank-Guaranteed. May Lose Value
Holdings [Text Block]
Portfolio Holdings (as of 2/28/25 )
Sector Allocation (Based on Net Assets)
Graphical Representation - Top N Holdings Chart
Not FDIC Insured. Not Bank-Guaranteed. May Lose Value
State Allocation (Based on Net Assets)
Graphical Representation - Allocation 1 Chart
C000000817 [Member]  
Shareholder Report [Line Items]  
Fund Name BNY Mellon AMT-Free Municipal Bond Fund
Class Name Class C
Trading Symbol DMUCX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about BNY Mellon AMT-Free Municipal Bond Fund (the “Fund”) for the period of September 1, 2024 to February 28, 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* $72 1.44%**
*
During the period, fees were waived and/or expenses reimbursed pursuant to an agreement with the Fund’s investment adviser, BNY Mellon Investment Adviser, Inc. If this agreement is not extended in the future, expenses could be higher.
**
Annualized.
Expenses Paid, Amount $ 72 [2]
Expense Ratio, Percent 1.44% [2],[3]
Net Assets $ 1,913,000,000
Holdings Count | Holding 547
Investment Company Portfolio Turnover 5.25%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (AS OF 2/28/25 )

Fund Size (Millions)
Number of Holdings
Portfolio Turnover
$1,913 547 5.25%
Not FDIC Insured. Not Bank-Guaranteed. May Lose Value
Holdings [Text Block]
Portfolio Holdings (as of 2/28/25 )
Sector Allocation (Based on Net Assets)
Graphical Representation - Top N Holdings Chart
Not FDIC Insured. Not Bank-Guaranteed. May Lose Value
State Allocation (Based on Net Assets)
Graphical Representation - Allocation 1 Chart
Not FDIC Insured. Not Bank-Guaranteed. May Lose Value
C000073398 [Member]  
Shareholder Report [Line Items]  
Fund Name BNY Mellon AMT-Free Municipal Bond Fund
Class Name Class I
Trading Symbol DMBIX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about BNY Mellon AMT-Free Municipal Bond Fund (the “Fund”) for the period of September 1, 2024 to February 28, 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 $20 0.41%*
*
Annualized.
Expenses Paid, Amount $ 20
Expense Ratio, Percent 0.41% [4]
Net Assets $ 1,913,000,000
Holdings Count | Holding 547
Investment Company Portfolio Turnover 5.25%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (AS OF 2/28/25 )

Fund Size (Millions)
Number of Holdings
Portfolio Turnover
$1,913 547 5.25%
Not FDIC Insured. Not Bank-Guaranteed. May Lose Value
Holdings [Text Block]
Portfolio Holdings (as of 2/28/25 )
Sector Allocation (Based on Net Assets)
Graphical Representation - Top N Holdings Chart
Not FDIC Insured. Not Bank-Guaranteed. May Lose Value
State Allocation (Based on Net Assets)
Graphical Representation - Allocation 1 Chart
Not FDIC Insured. Not Bank-Guaranteed. May Lose Value
C000130452 [Member]  
Shareholder Report [Line Items]  
Fund Name BNY Mellon AMT-Free Municipal Bond Fund
Class Name Class Y
Trading Symbol DMUYX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about BNY Mellon AMT-Free Municipal Bond Fund (the “Fund”) for the period of September 1, 2024 to February 28, 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 $19 0.38%*
*
Annualized.
Expenses Paid, Amount $ 19
Expense Ratio, Percent 0.38% [5]
Net Assets $ 1,913,000,000
Holdings Count | Holding 547
Investment Company Portfolio Turnover 5.25%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (AS OF 2/28/25 )

Fund Size (Millions)
Number of Holdings
Portfolio Turnover
$1,913 547 5.25%
Not FDIC Insured. Not Bank-Guaranteed. May Lose Value
Holdings [Text Block]
Portfolio Holdings (as of 2/28/25 )
Sector Allocation (Based on Net Assets)
Graphical Representation - Top N Holdings Chart
Not FDIC Insured. Not Bank-Guaranteed. May Lose Value
State Allocation (Based on Net Assets)
Graphical Representation - Allocation 1 Chart
Not FDIC Insured. Not Bank-Guaranteed. May Lose Value
C000000818 [Member]  
Shareholder Report [Line Items]  
Fund Name BNY Mellon AMT-Free Municipal Bond Fund
Class Name Class Z
Trading Symbol DRMBX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about BNY Mellon AMT-Free Municipal Bond Fund (the “Fund”) for the period of September 1, 2024 to February 28, 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 Z $26 0.53%*
*
Annualized.
Expenses Paid, Amount $ 26
Expense Ratio, Percent 0.53% [6]
Net Assets $ 1,913,000,000
Holdings Count | Holding 547
Investment Company Portfolio Turnover 5.25%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (AS OF 2/28/25 )

Fund Size (Millions)
Number of Holdings
Portfolio Turnover
$1,913 547 5.25%
Not FDIC Insured. Not Bank-Guaranteed. May Lose Value
Holdings [Text Block]
Portfolio Holdings (as of 2/28/25 )
Sector Allocation (Based on Net Assets)
Graphical Representation - Top N Holdings Chart
Not FDIC Insured. Not Bank-Guaranteed. May Lose Value
State Allocation (Based on Net Assets)
Graphical Representation - Allocation 1 Chart
Not FDIC Insured. Not Bank-Guaranteed. May Lose Value
C000046743 [Member]  
Shareholder Report [Line Items]  
Fund Name BNY Mellon High Yield Municipal Bond Fund
Class Name Class A
Trading Symbol DHYAX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about BNY Mellon High Yield Municipal Bond Fund (the “Fund”) for the period of September 1, 2024 to February 28, 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 $53 1.07%*
*
Annualized.
Expenses Paid, Amount $ 53
Expense Ratio, Percent 1.07% [7]
Net Assets $ 228,000,000
Holdings Count | Holding 165
Investment Company Portfolio Turnover 5.01%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (AS OF 2/28/25 )

Fund Size (Millions)
Number of Holdings
Portfolio Turnover
$228 165 5.01%
Not FDIC Insured. Not Bank-Guaranteed. May Lose Value
Holdings [Text Block]
Portfolio Holdings (as of 2/28/25 )
Sector Allocation (Based on Net Assets)
Graphical Representation - Top N Holdings Chart
Not FDIC Insured. Not Bank-Guaranteed. May Lose Value
State Allocation (Based on Net Assets)
Graphical Representation - Allocation 1 Chart
Not FDIC Insured. Not Bank-Guaranteed. May Lose Value
C000046744 [Member]  
Shareholder Report [Line Items]  
Fund Name BNY Mellon High Yield Municipal Bond Fund
Class Name Class C
Trading Symbol DHYCX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about BNY Mellon High Yield Municipal Bond Fund (the “Fund”) for the period of September 1, 2024 to February 28, 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 $93 1.87%*
*
Annualized.
Expenses Paid, Amount $ 93
Expense Ratio, Percent 1.87% [8]
Net Assets $ 228,000,000
Holdings Count | Holding 165
Investment Company Portfolio Turnover 5.01%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (AS OF 2/28/25 )

Fund Size (Millions)
Number of Holdings
Portfolio Turnover
$228 165 5.01%
Not FDIC Insured. Not Bank-Guaranteed. May Lose Value
Holdings [Text Block]
Portfolio Holdings (as of 2/28/25 )
Sector Allocation (Based on Net Assets)
Graphical Representation - Top N Holdings Chart
Not FDIC Insured. Not Bank-Guaranteed. May Lose Value
State Allocation (Based on Net Assets)
Graphical Representation - Allocation 1 Chart
Not FDIC Insured. Not Bank-Guaranteed. May Lose Value
C000073399 [Member]  
Shareholder Report [Line Items]  
Fund Name BNY Mellon High Yield Municipal Bond Fund
Class Name Class I
Trading Symbol DYBIX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about BNY Mellon High Yield Municipal Bond Fund (the “Fund”) for the period of September 1, 2024 to February 28, 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 $42 0.84%*
*
Annualized.
Expenses Paid, Amount $ 42
Expense Ratio, Percent 0.84% [9]
Net Assets $ 228,000,000
Holdings Count | Holding 165
Investment Company Portfolio Turnover 5.01%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (AS OF 2/28/25 )

Fund Size (Millions)
Number of Holdings
Portfolio Turnover
$228 165 5.01%
Not FDIC Insured. Not Bank-Guaranteed. May Lose Value
Holdings [Text Block]
Portfolio Holdings (as of 2/28/25 )
Sector Allocation (Based on Net Assets)
Graphical Representation - Top N Holdings Chart
Not FDIC Insured. Not Bank-Guaranteed. May Lose Value
State Allocation (Based on Net Assets)
Graphical Representation - Allocation 1 Chart
C000130453 [Member]  
Shareholder Report [Line Items]  
Fund Name BNY Mellon High Yield Municipal Bond Fund
Class Name Class Y
Trading Symbol DHYYX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about BNY Mellon High Yield Municipal Bond Fund (the “Fund”) for the period of September 1, 2024 to February 28, 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 $41 0.82%*
*
Annualized.
Expenses Paid, Amount $ 41
Expense Ratio, Percent 0.82% [10]
Net Assets $ 228,000,000
Holdings Count | Holding 165
Investment Company Portfolio Turnover 5.01%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (AS OF 2/28/25 )

Fund Size (Millions)
Number of Holdings
Portfolio Turnover
$228 165 5.01%
Not FDIC Insured. Not Bank-Guaranteed. May Lose Value
Holdings [Text Block]
Portfolio Holdings (as of 2/28/25 )
Sector Allocation (Based on Net Assets)
Graphical Representation - Top N Holdings Chart
Not FDIC Insured. Not Bank-Guaranteed. May Lose Value
State Allocation (Based on Net Assets)
Graphical Representation - Allocation 1 Chart
C000007813 [Member]  
Shareholder Report [Line Items]  
Fund Name BNY Mellon High Yield Municipal Bond Fund
Class Name Class Z
Trading Symbol DHMBX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about BNY Mellon High Yield Municipal Bond Fund (the “Fund”) for the period of September 1, 2024 to February 28, 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 Z $47 0.95%*
*
Annualized.
Expenses Paid, Amount $ 47
Expense Ratio, Percent 0.95% [11]
Net Assets $ 228,000,000
Holdings Count | Holding 165
Investment Company Portfolio Turnover 5.01%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (AS OF 2/28/25 )

Fund Size (Millions)
Number of Holdings
Portfolio Turnover
$228 165 5.01%
Not FDIC Insured. Not Bank-Guaranteed. May Lose Value
Holdings [Text Block]
Portfolio Holdings (as of 2/28/25 )
Sector Allocation (Based on Net Assets)
Graphical Representation - Top N Holdings Chart
Not FDIC Insured. Not Bank-Guaranteed. May Lose Value
State Allocation (Based on Net Assets)
Graphical Representation - Allocation 1 Chart
Not FDIC Insured. Not Bank-Guaranteed. May Lose Value
[1] Annualized.
[2] During the period, fees were waived and/or expenses reimbursed pursuant to an agreement with the Fund’s investment adviser, BNY Mellon Investment Adviser, Inc. If this agreement is not extended in the future, expenses could be higher.
[3] Annualized.
[4] Annualized.
[5] Annualized.
[6] Annualized.
[7] Annualized.
[8] Annualized.
[9] Annualized.
[10] Annualized.
[11] Annualized.