Dreyfus Premier Short Intermediate Municipal Bond Fund N-CSRS 29 Nov 24 Certified semi-annual shareholder report (management investment company) Financial data

Form N-CSR Cover

Form N-CSR Cover	6 Months Ended
	Sep. 30, 2024
Shareholder Report [Line Items]
Document Type	N-CSRS
Amendment Flag	false
Registrant Name	BNY Mellon Short Term Municipal Bond Fund
Entity Central Index Key	0000810305
Entity Investment Company Type	N-1A
Document Period End Date	Sep. 30, 2024

Shareholder Report

Shareholder Report	6 Months Ended
	Sep. 30, 2024 USD ($) Holdings
Shareholder Report [Line Items]
Document Type	N-CSRS
Amendment Flag	false
Registrant Name	BNY Mellon Short Term Municipal Bond Fund
Entity Central Index Key	0000810305
Entity Investment Company Type	N-1A
Document Period End Date	Sep. 30, 2024
BNY Mellon Short Term Municipal Bond Fund - Class A
Shareholder Report [Line Items]
Fund Name	BNY Mellon Short Term Municipal Bond Fund
Class Name	Class A
Trading Symbol	DMBAX
Annual or Semi-Annual Statement [Text Block]	This semi-annual shareholder report contains important information about BNY Mellon Short Term Municipal Bond Fund (the “Fund”) for the period of April 1, 2024 to September 30, 2024.
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
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 * $ 0.64 % ** * During the period, fees were waived and/or expenses reimbused 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	$ 32	[1]
Expense Ratio, Percent	0.64%	[1],[2]
Net Assets	$ 140,000,000
Holdings Count | Holdings	99
Investment Company, Portfolio Turnover	16.41%
Additional Fund Statistics [Text Block]	KEY FUND STATISTICS (AS OF 9/30/24) $ 99 16.41 %
Holdings [Text Block]	Portfolio Holdings (as of 9/30/ 24 Sector Allocation (Based on Net Assets State Allocation ( Ba on Net Assets
BNY Mellon Short Term Municipal Bond Fund - Class D
Shareholder Report [Line Items]
Fund Name	BNY Mellon Short Term Municipal Bond Fund
Class Name	Class D
Trading Symbol	DSIBX
Annual or Semi-Annual Statement [Text Block]	This semi-annual shareholder report contains important information about BNY Mellon Short Term Municipal Bond Fund (the “Fund”) for the period of April 1, 2024 to September 30, 2024.
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
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 D * $ 0.49 % ** * During the period, fees were waived and/or expenses reimbused 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	$ 25	[1]
Expense Ratio, Percent	0.49%	[1],[2]
Net Assets	$ 140,000,000
Holdings Count | Holdings	99
Investment Company, Portfolio Turnover	16.41%
Additional Fund Statistics [Text Block]	KEY FUND STATISTICS (AS OF 9/30/24) $ 99 16.41 %
Holdings [Text Block]	Portfolio Holdings (as of 9/30/24) Sector Allocation (Based on Net Assets) State Allocation ( Based on Assets
BNY Mellon Short Term Municipal Bond Fund - Class I
Shareholder Report [Line Items]
Fund Name	BNY Mellon Short Term Municipal Bond Fund
Class Name	Class I
Trading Symbol	DIMIX
Annual or Semi-Annual Statement [Text Block]	This semi-annual shareholder report contains important information about BNY Mellon Short Term Municipal Bond Fund (the “Fund”) for the period of April 1, 2024 to September 30, 2024.
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
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 * $ 0.39 % ** * During the period, fees were waived and/or expenses reimbused 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	$ 20	[1]
Expense Ratio, Percent	0.39%	[1],[2]
Net Assets	$ 140,000,000
Holdings Count | Holdings	99
Investment Company, Portfolio Turnover	16.41%
Additional Fund Statistics [Text Block]	KEY FUND STATISTICS (AS OF 9/30/24) $ 99 16.41 %
Holdings [Text Block]	Portfolio Holdings (as of 9/30/24) Sector Allocation (Based on Net Assets) State Allocation (Bas ed on Assets
BNY Mellon Short Term Municipal Bond Fund - Class Y
Shareholder Report [Line Items]
Fund Name	BNY Mellon Short Term Municipal Bond Fund
Class Name	Class Y
Trading Symbol	DMYBX
Annual or Semi-Annual Statement [Text Block]	This semi-annual shareholder report contains important information about BNY Mellon Short Term Municipal Bond Fund (the “Fund”) for the period of April 1, 2024 to September 30, 2024.
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
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 * $ 0.39 % ** * During the period, fees were waived and/or expenses reimbused 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	$ 20	[1]
Expense Ratio, Percent	0.39%	[1],[2]
Net Assets	$ 140,000,000
Holdings Count | Holdings	99
Investment Company, Portfolio Turnover	16.41%
Additional Fund Statistics [Text Block]	KEY FUND STATISTICS (AS OF 9/30/24) $ 99 16.41 %
Holdings [Text Block]	Portfolio Holdings (as of 9/30/ 24 Sector Allocation (Based on Net Assets State Allocation (Based on Net Assets
[1]During the period, fees were waived and/or expenses reimbused 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.[2]Annualized.

Shareholder Report, Holdings (D

Shareholder Report, Holdings (Details)	Sep. 30, 2024
BNY Mellon Short Term Municipal Bond Fund - Class Y | Medical [Member]
Holdings [Line Items]
Percent of Net Asset Value	15.10%
BNY Mellon Short Term Municipal Bond Fund - Class Y | General Obligation [Member]
Holdings [Line Items]
Percent of Net Asset Value	13%
BNY Mellon Short Term Municipal Bond Fund - Class Y | Development [Member]
Holdings [Line Items]
Percent of Net Asset Value	11.70%
BNY Mellon Short Term Municipal Bond Fund - Class Y | Education [Member]
Holdings [Line Items]
Percent of Net Asset Value	10.50%
BNY Mellon Short Term Municipal Bond Fund - Class Y | Airport [Member]
Holdings [Line Items]
Percent of Net Asset Value	7.30%
BNY Mellon Short Term Municipal Bond Fund - Class Y | Student Loans [Member]
Holdings [Line Items]
Percent of Net Asset Value	6.40%
BNY Mellon Short Term Municipal Bond Fund - Class Y | Transportation Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	4.90%
BNY Mellon Short Term Municipal Bond Fund - Class Y | Power [Member]
Holdings [Line Items]
Percent of Net Asset Value	4.30%
BNY Mellon Short Term Municipal Bond Fund - Class Y | Utilities Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	3.30%
BNY Mellon Short Term Municipal Bond Fund - Class Y | Nursing Homes [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.90%
BNY Mellon Short Term Municipal Bond Fund - Class Y | School District [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.40%
BNY Mellon Short Term Municipal Bond Fund - Class Y | Tobacco Settlement [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.30%
BNY Mellon Short Term Municipal Bond Fund - Class Y | Water and Sewer [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.10%
BNY Mellon Short Term Municipal Bond Fund - Class Y | Net Other Assets and Liabilities in Sector Allocation [Member]
Holdings [Line Items]
Percent of Net Asset Value	15.80%
BNY Mellon Short Term Municipal Bond Fund - Class Y | TEXAS
Holdings [Line Items]
Percent of Net Asset Value	10.90%
BNY Mellon Short Term Municipal Bond Fund - Class Y | PENNSYLVANIA
Holdings [Line Items]
Percent of Net Asset Value	9.10%
BNY Mellon Short Term Municipal Bond Fund - Class Y | NEW YORK
Holdings [Line Items]
Percent of Net Asset Value	7.60%
BNY Mellon Short Term Municipal Bond Fund - Class Y | ILLINOIS
Holdings [Line Items]
Percent of Net Asset Value	7.30%
BNY Mellon Short Term Municipal Bond Fund - Class Y | FLORIDA
Holdings [Line Items]
Percent of Net Asset Value	6.30%
BNY Mellon Short Term Municipal Bond Fund - Class Y | INDIANA
Holdings [Line Items]
Percent of Net Asset Value	5.40%
BNY Mellon Short Term Municipal Bond Fund - Class Y | NEW JERSEY
Holdings [Line Items]
Percent of Net Asset Value	3.90%
BNY Mellon Short Term Municipal Bond Fund - Class Y | NORTH CAROLINA
Holdings [Line Items]
Percent of Net Asset Value	3.70%
BNY Mellon Short Term Municipal Bond Fund - Class Y | ARIZONA
Holdings [Line Items]
Percent of Net Asset Value	3.40%
BNY Mellon Short Term Municipal Bond Fund - Class Y | OHIO
Holdings [Line Items]
Percent of Net Asset Value	3.30%
BNY Mellon Short Term Municipal Bond Fund - Class Y | WASHINGTON
Holdings [Line Items]
Percent of Net Asset Value	3%
BNY Mellon Short Term Municipal Bond Fund - Class Y | SOUTH CAROLINA
Holdings [Line Items]
Percent of Net Asset Value	3%
BNY Mellon Short Term Municipal Bond Fund - Class Y | MARYLAND
Holdings [Line Items]
Percent of Net Asset Value	2.90%
BNY Mellon Short Term Municipal Bond Fund - Class Y | MICHIGAN
Holdings [Line Items]
Percent of Net Asset Value	2.80%
BNY Mellon Short Term Municipal Bond Fund - Class Y | IOWA
Holdings [Line Items]
Percent of Net Asset Value	2.60%
BNY Mellon Short Term Municipal Bond Fund - Class Y | CALIFORNIA
Holdings [Line Items]
Percent of Net Asset Value	2.50%
BNY Mellon Short Term Municipal Bond Fund - Class Y | Net Other Assets and Liabilities in State Allocation [Member]
Holdings [Line Items]
Percent of Net Asset Value	22.30%
BNY Mellon Short Term Municipal Bond Fund - Class I | Medical [Member]
Holdings [Line Items]
Percent of Net Asset Value	15.10%
BNY Mellon Short Term Municipal Bond Fund - Class I | General Obligation [Member]
Holdings [Line Items]
Percent of Net Asset Value	13%
BNY Mellon Short Term Municipal Bond Fund - Class I | Development [Member]
Holdings [Line Items]
Percent of Net Asset Value	11.70%
BNY Mellon Short Term Municipal Bond Fund - Class I | Education [Member]
Holdings [Line Items]
Percent of Net Asset Value	10.50%
BNY Mellon Short Term Municipal Bond Fund - Class I | Airport [Member]
Holdings [Line Items]
Percent of Net Asset Value	7.30%
BNY Mellon Short Term Municipal Bond Fund - Class I | Student Loans [Member]
Holdings [Line Items]
Percent of Net Asset Value	6.40%
BNY Mellon Short Term Municipal Bond Fund - Class I | Transportation Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	4.90%
BNY Mellon Short Term Municipal Bond Fund - Class I | Power [Member]
Holdings [Line Items]
Percent of Net Asset Value	4.30%
BNY Mellon Short Term Municipal Bond Fund - Class I | Utilities Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	3.30%
BNY Mellon Short Term Municipal Bond Fund - Class I | Nursing Homes [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.90%
BNY Mellon Short Term Municipal Bond Fund - Class I | School District [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.40%
BNY Mellon Short Term Municipal Bond Fund - Class I | Tobacco Settlement [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.30%
BNY Mellon Short Term Municipal Bond Fund - Class I | Water and Sewer [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.10%
BNY Mellon Short Term Municipal Bond Fund - Class I | Net Other Assets and Liabilities in Sector Allocation [Member]
Holdings [Line Items]
Percent of Net Asset Value	15.80%
BNY Mellon Short Term Municipal Bond Fund - Class I | TEXAS
Holdings [Line Items]
Percent of Net Asset Value	10.90%
BNY Mellon Short Term Municipal Bond Fund - Class I | PENNSYLVANIA
Holdings [Line Items]
Percent of Net Asset Value	9.10%
BNY Mellon Short Term Municipal Bond Fund - Class I | NEW YORK
Holdings [Line Items]
Percent of Net Asset Value	7.60%
BNY Mellon Short Term Municipal Bond Fund - Class I | ILLINOIS
Holdings [Line Items]
Percent of Net Asset Value	7.30%
BNY Mellon Short Term Municipal Bond Fund - Class I | FLORIDA
Holdings [Line Items]
Percent of Net Asset Value	6.30%
BNY Mellon Short Term Municipal Bond Fund - Class I | INDIANA
Holdings [Line Items]
Percent of Net Asset Value	5.40%
BNY Mellon Short Term Municipal Bond Fund - Class I | NEW JERSEY
Holdings [Line Items]
Percent of Net Asset Value	3.90%
BNY Mellon Short Term Municipal Bond Fund - Class I | NORTH CAROLINA
Holdings [Line Items]
Percent of Net Asset Value	3.70%
BNY Mellon Short Term Municipal Bond Fund - Class I | ARIZONA
Holdings [Line Items]
Percent of Net Asset Value	3.40%
BNY Mellon Short Term Municipal Bond Fund - Class I | OHIO
Holdings [Line Items]
Percent of Net Asset Value	3.30%
BNY Mellon Short Term Municipal Bond Fund - Class I | WASHINGTON
Holdings [Line Items]
Percent of Net Asset Value	3%
BNY Mellon Short Term Municipal Bond Fund - Class I | SOUTH CAROLINA
Holdings [Line Items]
Percent of Net Asset Value	3%
BNY Mellon Short Term Municipal Bond Fund - Class I | MARYLAND
Holdings [Line Items]
Percent of Net Asset Value	2.90%
BNY Mellon Short Term Municipal Bond Fund - Class I | MICHIGAN
Holdings [Line Items]
Percent of Net Asset Value	2.80%
BNY Mellon Short Term Municipal Bond Fund - Class I | IOWA
Holdings [Line Items]
Percent of Net Asset Value	2.60%
BNY Mellon Short Term Municipal Bond Fund - Class I | CALIFORNIA
Holdings [Line Items]
Percent of Net Asset Value	2.50%
BNY Mellon Short Term Municipal Bond Fund - Class I | Net Other Assets and Liabilities in State Allocation [Member]
Holdings [Line Items]
Percent of Net Asset Value	22.30%
BNY Mellon Short Term Municipal Bond Fund - Class D | Medical [Member]
Holdings [Line Items]
Percent of Net Asset Value	15.10%
BNY Mellon Short Term Municipal Bond Fund - Class D | General Obligation [Member]
Holdings [Line Items]
Percent of Net Asset Value	13%
BNY Mellon Short Term Municipal Bond Fund - Class D | Development [Member]
Holdings [Line Items]
Percent of Net Asset Value	11.70%
BNY Mellon Short Term Municipal Bond Fund - Class D | Education [Member]
Holdings [Line Items]
Percent of Net Asset Value	10.50%
BNY Mellon Short Term Municipal Bond Fund - Class D | Airport [Member]
Holdings [Line Items]
Percent of Net Asset Value	7.30%
BNY Mellon Short Term Municipal Bond Fund - Class D | Student Loans [Member]
Holdings [Line Items]
Percent of Net Asset Value	6.40%
BNY Mellon Short Term Municipal Bond Fund - Class D | Transportation Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	4.90%
BNY Mellon Short Term Municipal Bond Fund - Class D | Power [Member]
Holdings [Line Items]
Percent of Net Asset Value	4.30%
BNY Mellon Short Term Municipal Bond Fund - Class D | Utilities Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	3.30%
BNY Mellon Short Term Municipal Bond Fund - Class D | Nursing Homes [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.90%
BNY Mellon Short Term Municipal Bond Fund - Class D | School District [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.40%
BNY Mellon Short Term Municipal Bond Fund - Class D | Tobacco Settlement [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.30%
BNY Mellon Short Term Municipal Bond Fund - Class D | Water and Sewer [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.10%
BNY Mellon Short Term Municipal Bond Fund - Class D | Net Other Assets and Liabilities in Sector Allocation [Member]
Holdings [Line Items]
Percent of Net Asset Value	15.80%
BNY Mellon Short Term Municipal Bond Fund - Class D | TEXAS
Holdings [Line Items]
Percent of Net Asset Value	10.90%
BNY Mellon Short Term Municipal Bond Fund - Class D | PENNSYLVANIA
Holdings [Line Items]
Percent of Net Asset Value	9.10%
BNY Mellon Short Term Municipal Bond Fund - Class D | NEW YORK
Holdings [Line Items]
Percent of Net Asset Value	7.60%
BNY Mellon Short Term Municipal Bond Fund - Class D | ILLINOIS
Holdings [Line Items]
Percent of Net Asset Value	7.30%
BNY Mellon Short Term Municipal Bond Fund - Class D | FLORIDA
Holdings [Line Items]
Percent of Net Asset Value	6.30%
BNY Mellon Short Term Municipal Bond Fund - Class D | INDIANA
Holdings [Line Items]
Percent of Net Asset Value	5.40%
BNY Mellon Short Term Municipal Bond Fund - Class D | NEW JERSEY
Holdings [Line Items]
Percent of Net Asset Value	3.90%
BNY Mellon Short Term Municipal Bond Fund - Class D | NORTH CAROLINA
Holdings [Line Items]
Percent of Net Asset Value	3.70%
BNY Mellon Short Term Municipal Bond Fund - Class D | ARIZONA
Holdings [Line Items]
Percent of Net Asset Value	3.40%
BNY Mellon Short Term Municipal Bond Fund - Class D | OHIO
Holdings [Line Items]
Percent of Net Asset Value	3.30%
BNY Mellon Short Term Municipal Bond Fund - Class D | WASHINGTON
Holdings [Line Items]
Percent of Net Asset Value	3%
BNY Mellon Short Term Municipal Bond Fund - Class D | SOUTH CAROLINA
Holdings [Line Items]
Percent of Net Asset Value	3%
BNY Mellon Short Term Municipal Bond Fund - Class D | MARYLAND
Holdings [Line Items]
Percent of Net Asset Value	2.90%
BNY Mellon Short Term Municipal Bond Fund - Class D | MICHIGAN
Holdings [Line Items]
Percent of Net Asset Value	2.80%
BNY Mellon Short Term Municipal Bond Fund - Class D | IOWA
Holdings [Line Items]
Percent of Net Asset Value	2.60%
BNY Mellon Short Term Municipal Bond Fund - Class D | CALIFORNIA
Holdings [Line Items]
Percent of Net Asset Value	2.50%
BNY Mellon Short Term Municipal Bond Fund - Class D | Net Other Assets and Liabilities in State Allocation [Member]
Holdings [Line Items]
Percent of Net Asset Value	22.30%
BNY Mellon Short Term Municipal Bond Fund - Class A | Medical [Member]
Holdings [Line Items]
Percent of Net Asset Value	15.10%
BNY Mellon Short Term Municipal Bond Fund - Class A | General Obligation [Member]
Holdings [Line Items]
Percent of Net Asset Value	13%
BNY Mellon Short Term Municipal Bond Fund - Class A | Development [Member]
Holdings [Line Items]
Percent of Net Asset Value	11.70%
BNY Mellon Short Term Municipal Bond Fund - Class A | Education [Member]
Holdings [Line Items]
Percent of Net Asset Value	10.50%
BNY Mellon Short Term Municipal Bond Fund - Class A | Airport [Member]
Holdings [Line Items]
Percent of Net Asset Value	7.30%
BNY Mellon Short Term Municipal Bond Fund - Class A | Student Loans [Member]
Holdings [Line Items]
Percent of Net Asset Value	6.40%
BNY Mellon Short Term Municipal Bond Fund - Class A | Transportation Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	4.90%
BNY Mellon Short Term Municipal Bond Fund - Class A | Power [Member]
Holdings [Line Items]
Percent of Net Asset Value	4.30%
BNY Mellon Short Term Municipal Bond Fund - Class A | Utilities Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	3.30%
BNY Mellon Short Term Municipal Bond Fund - Class A | Nursing Homes [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.90%
BNY Mellon Short Term Municipal Bond Fund - Class A | School District [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.40%
BNY Mellon Short Term Municipal Bond Fund - Class A | Tobacco Settlement [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.30%
BNY Mellon Short Term Municipal Bond Fund - Class A | Water and Sewer [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.10%
BNY Mellon Short Term Municipal Bond Fund - Class A | Net Other Assets and Liabilities in Sector Allocation [Member]
Holdings [Line Items]
Percent of Net Asset Value	15.80%
BNY Mellon Short Term Municipal Bond Fund - Class A | TEXAS
Holdings [Line Items]
Percent of Net Asset Value	10.90%
BNY Mellon Short Term Municipal Bond Fund - Class A | PENNSYLVANIA
Holdings [Line Items]
Percent of Net Asset Value	9.10%
BNY Mellon Short Term Municipal Bond Fund - Class A | NEW YORK
Holdings [Line Items]
Percent of Net Asset Value	7.60%
BNY Mellon Short Term Municipal Bond Fund - Class A | ILLINOIS
Holdings [Line Items]
Percent of Net Asset Value	7.30%
BNY Mellon Short Term Municipal Bond Fund - Class A | FLORIDA
Holdings [Line Items]
Percent of Net Asset Value	6.30%
BNY Mellon Short Term Municipal Bond Fund - Class A | INDIANA
Holdings [Line Items]
Percent of Net Asset Value	5.40%
BNY Mellon Short Term Municipal Bond Fund - Class A | NEW JERSEY
Holdings [Line Items]
Percent of Net Asset Value	3.90%
BNY Mellon Short Term Municipal Bond Fund - Class A | NORTH CAROLINA
Holdings [Line Items]
Percent of Net Asset Value	3.70%
BNY Mellon Short Term Municipal Bond Fund - Class A | ARIZONA
Holdings [Line Items]
Percent of Net Asset Value	3.40%
BNY Mellon Short Term Municipal Bond Fund - Class A | OHIO
Holdings [Line Items]
Percent of Net Asset Value	3.30%
BNY Mellon Short Term Municipal Bond Fund - Class A | WASHINGTON
Holdings [Line Items]
Percent of Net Asset Value	3%
BNY Mellon Short Term Municipal Bond Fund - Class A | SOUTH CAROLINA
Holdings [Line Items]
Percent of Net Asset Value	3%
BNY Mellon Short Term Municipal Bond Fund - Class A | MARYLAND
Holdings [Line Items]
Percent of Net Asset Value	2.90%
BNY Mellon Short Term Municipal Bond Fund - Class A | MICHIGAN
Holdings [Line Items]
Percent of Net Asset Value	2.80%
BNY Mellon Short Term Municipal Bond Fund - Class A | IOWA
Holdings [Line Items]
Percent of Net Asset Value	2.60%
BNY Mellon Short Term Municipal Bond Fund - Class A | CALIFORNIA
Holdings [Line Items]
Percent of Net Asset Value	2.50%
BNY Mellon Short Term Municipal Bond Fund - Class A | Net Other Assets and Liabilities in State Allocation [Member]
Holdings [Line Items]
Percent of Net Asset Value	22.30%