BNY Mellon Opportunistic Municipal Securities Fund (DMBVX)
Company Profile
| Form N-CSR Cover | 6 Months Ended |
| Oct. 31, 2024 | |
| Shareholder Report [Line Items] | |
| Document Type | N-CSRS |
| Amendment Flag | false |
| Registrant Name | BNY Mellon Opportunistic Municipal Securities Fund |
| Entity Central Index Key | 0000797923 |
| Entity Investment Company Type | N-1A |
| Document Period End Date | Oct. 31, 2024 |
| Shareholder Report | 6 Months Ended | |
| Oct. 31, 2024 USD ($) Holdings | ||
| Shareholder Report [Line Items] | ||
| Document Type | N-CSRS | |
| Amendment Flag | false | |
| Registrant Name | BNY Mellon Opportunistic Municipal Securities Fund | |
| Entity Central Index Key | 0000797923 | |
| Entity Investment Company Type | N-1A | |
| Document Period End Date | Oct. 31, 2024 | |
| BNY Mellon Opportunistic Municipal Securities Fund - Class A | ||
| Shareholder Report [Line Items] | ||
| Fund Name | BNY Mellon Opportunistic Municipal Securities Fund | |
| Class Name | Class A | |
| Trading Symbol | PTEBX | |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about BNY Mellon Opportunistic Municipal Securities Fund (the “Fund”) for the period of May 1, 2024 to October 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 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 $ 0.77 % * * Annualized. | |
| Expenses Paid, Amount | $ 39 | |
| Expense Ratio, Percent | 0.77% | [1] |
| Net Assets | $ 470,000,000 | |
| Holdings Count | Holdings | 236 | |
| Investment Company, Portfolio Turnover | 10.64% | |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS (AS OF 10/31/24 ) $ 236 10.64 % | |
| Holdings [Text Block] | Portfolio Holdings (as of 10/31/24 ) Sector Allocation (Based on Net Assets) State Allocation (Based on Net Assets) | |
| BNY Mellon Opportunistic Municipal Securities Fund - Class C | ||
| Shareholder Report [Line Items] | ||
| Fund Name | BNY Mellon Opportunistic Municipal Securities Fund | |
| Class Name | Class C | |
| Trading Symbol | DMBCX | |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about BNY Mellon Opportunistic Municipal Securities Fund (the “Fund”) for the period of May 1, 2024 to October 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 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 C $ 1.56 % * * Annualized. | |
| Expenses Paid, Amount | $ 80 | |
| Expense Ratio, Percent | 1.56% | [1] |
| Net Assets | $ 470,000,000 | |
| Holdings Count | Holdings | 236 | |
| Investment Company, Portfolio Turnover | 10.64% | |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS (AS OF 10/31/24 ) $ 236 10.64 % | |
| Holdings [Text Block] | Portfolio Holdings (as of 10/31/24 ) Sector Allocation (Based on Net Assets) State Allocation (Based on Net Assets) | |
| BNY Mellon Opportunistic Municipal Securities Fund - Class I | ||
| Shareholder Report [Line Items] | ||
| Fund Name | BNY Mellon Opportunistic Municipal Securities Fund | |
| Class Name | Class I | |
| Trading Symbol | DMBVX | |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about BNY Mellon Opportunistic Municipal Securities Fund ( the | |
| 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 $ 0.54 % * * Annualized. | |
| Expenses Paid, Amount | $ 28 | |
| Expense Ratio, Percent | 0.54% | [1] |
| Net Assets | $ 470,000,000 | |
| Holdings Count | Holdings | 236 | |
| Investment Company, Portfolio Turnover | 10.64% | |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS (AS OF 10/31/24 ) $ 236 10.64 % | |
| Holdings [Text Block] | Portfolio Holdings (as of 10/31/24 ) Sector Allocation (Based on Net Assets) State Allocation (Based on Net Assets) | |
| BNY Mellon Opportunistic Municipal Securities Fund - Class Y | ||
| Shareholder Report [Line Items] | ||
| Fund Name | BNY Mellon Opportunistic Municipal Securities Fund | |
| Class Name | Class Y | |
| Trading Symbol | DMBYX | |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about BNY Mellon Opportunistic Municipal Securities Fund (t he | |
| 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 $ 0.49 % * * Annualized. | |
| Expenses Paid, Amount | $ 25 | |
| Expense Ratio, Percent | 0.49% | [1] |
| Net Assets | $ 470,000,000 | |
| Holdings Count | Holdings | 236 | |
| Investment Company, Portfolio Turnover | 10.64% | |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS (AS OF 10/31/24 ) $ 236 10.64 % | |
| Holdings [Text Block] | Portfolio Holdings (as of 10/31/24 ) Sector Allocation (Based on Net Assets) State Allocation (Based on Net Assets) | |
| BNY Mellon Opportunistic Municipal Securities Fund - Class Z | ||
| Shareholder Report [Line Items] | ||
| Fund Name | BNY Mellon Opportunistic Municipal Securities Fund | |
| Class Name | Class Z | |
| Trading Symbol | DMBZX | |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about BNY Mellon Opportunistic Municipal Securities Fund ( the | |
| 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 Z $ 0.73 % * * Annualized. | |
| Expenses Paid, Amount | $ 37 | |
| Expense Ratio, Percent | 0.73% | [1] |
| Net Assets | $ 470,000,000 | |
| Holdings Count | Holdings | 236 | |
| Investment Company, Portfolio Turnover | 10.64% | |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS (AS OF 10/31/24 ) $ 236 10.64 % | |
| Holdings [Text Block] | Portfolio Holdings (as of 10/31/24 ) Sector Allocation (Based on Net Assets) State Allocation (Based on Net Assets) | |
| [1]Annualized. | ||
| Shareholder Report, Holdings (Details) | Oct. 31, 2024 |
| BNY Mellon Opportunistic Municipal Securities Fund - Class A | Airport [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 12.50% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class A | Education [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10.20% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class A | Medical [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.30% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class A | Development [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.30% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class A | Transportation Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.30% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class A | General Obligation [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.20% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class A | Water & Sewer [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.20% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class A | Power [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.50% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class A | Nursing Homes [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.40% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class A | School District [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.10% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class A | Tobacco Settlement [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.90% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class A | Utilities Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.20% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class A | Multifamily Housing [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.20% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class A | Net Other Assets and Liabilities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 24.70% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class A | NEW YORK | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10.60% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class A | TEXAS | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10.40% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class A | PENNSYLVANIA | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.90% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class A | ILLINOIS | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.70% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class A | CALIFORNIA | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.90% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class A | MICHIGAN | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.40% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class A | COLORADO | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class A | ARIZONA | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.90% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class A | FLORIDA | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.90% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class A | GEORGIA | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.70% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class A | WASHINGTON | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.60% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class A | NEW JERSEY | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.50% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class A | WISCONSIN | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.60% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class A | NEVADA | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.50% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class A | OHIO | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.40% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class A | IOWA | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.30% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class A | DISTRICT OF COLUMBIA | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.30% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class A | ALABAMA | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.20% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class A | LOUISIANA | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.10% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class A | KENTUCKY | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class A | U S Related [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.90% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class A | SOUTH CAROLINA | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.50% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class A | TENNESSEE | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.20% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class A | OREGON | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.20% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class A | VIRGINIA | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.10% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class A | ARKANSAS | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.10% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class A | MINNESOTA | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class A | Net Other Assets and Liabilities one [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.10% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class C | Airport [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 12.50% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class C | Education [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10.20% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class C | Medical [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.30% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class C | Development [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.30% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class C | Transportation Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.30% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class C | General Obligation [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.20% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class C | Water & Sewer [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.20% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class C | Power [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.50% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class C | Nursing Homes [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.40% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class C | School District [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.10% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class C | Tobacco Settlement [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.90% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class C | Utilities Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.20% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class C | Multifamily Housing [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.20% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class C | Net Other Assets and Liabilities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 24.70% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class C | NEW YORK | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10.60% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class C | TEXAS | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10.40% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class C | PENNSYLVANIA | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.90% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class C | ILLINOIS | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.70% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class C | CALIFORNIA | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.90% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class C | MICHIGAN | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.40% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class C | COLORADO | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class C | ARIZONA | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.90% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class C | FLORIDA | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.90% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class C | GEORGIA | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.70% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class C | WASHINGTON | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.60% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class C | NEW JERSEY | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.50% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class C | WISCONSIN | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.60% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class C | NEVADA | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.50% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class C | OHIO | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.40% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class C | IOWA | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.30% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class C | DISTRICT OF COLUMBIA | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.30% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class C | ALABAMA | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.20% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class C | LOUISIANA | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.10% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class C | KENTUCKY | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class C | U S Related [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.90% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class C | SOUTH CAROLINA | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.50% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class C | TENNESSEE | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.20% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class C | OREGON | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.20% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class C | VIRGINIA | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.10% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class C | ARKANSAS | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.10% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class C | MINNESOTA | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class C | Net Other Assets and Liabilities one [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.10% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class I | Airport [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 12.50% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class I | Education [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10.20% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class I | Medical [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.30% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class I | Development [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.30% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class I | Transportation Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.30% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class I | General Obligation [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.20% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class I | Water & Sewer [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.20% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class I | Power [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.50% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class I | Nursing Homes [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.40% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class I | School District [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.10% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class I | Tobacco Settlement [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.90% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class I | Utilities Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.20% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class I | Multifamily Housing [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.20% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class I | Net Other Assets and Liabilities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 24.70% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class I | NEW YORK | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10.60% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class I | TEXAS | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10.40% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class I | PENNSYLVANIA | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.90% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class I | ILLINOIS | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.70% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class I | CALIFORNIA | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.90% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class I | MICHIGAN | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.40% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class I | COLORADO | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class I | ARIZONA | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.90% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class I | FLORIDA | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.90% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class I | GEORGIA | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.70% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class I | WASHINGTON | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.60% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class I | NEW JERSEY | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.50% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class I | WISCONSIN | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.60% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class I | NEVADA | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.50% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class I | OHIO | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.40% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class I | IOWA | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.30% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class I | DISTRICT OF COLUMBIA | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.30% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class I | ALABAMA | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.20% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class I | LOUISIANA | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.10% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class I | KENTUCKY | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class I | U S Related [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.90% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class I | SOUTH CAROLINA | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.50% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class I | TENNESSEE | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.20% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class I | OREGON | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.20% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class I | VIRGINIA | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.10% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class I | ARKANSAS | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.10% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class I | MINNESOTA | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class I | Net Other Assets and Liabilities one [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.10% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class Y | Airport [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 12.50% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class Y | Education [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10.20% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class Y | Medical [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.30% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class Y | Development [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.30% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class Y | Transportation Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.30% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class Y | General Obligation [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.20% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class Y | Water & Sewer [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.20% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class Y | Power [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.50% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class Y | Nursing Homes [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.40% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class Y | School District [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.10% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class Y | Tobacco Settlement [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.90% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class Y | Utilities Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.20% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class Y | Multifamily Housing [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.20% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class Y | Net Other Assets and Liabilities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 24.70% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class Y | NEW YORK | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10.60% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class Y | TEXAS | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10.40% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class Y | PENNSYLVANIA | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.90% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class Y | ILLINOIS | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.70% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class Y | CALIFORNIA | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.90% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class Y | MICHIGAN | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.40% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class Y | COLORADO | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class Y | ARIZONA | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.90% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class Y | FLORIDA | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.90% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class Y | GEORGIA | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.70% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class Y | WASHINGTON | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.60% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class Y | NEW JERSEY | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.50% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class Y | WISCONSIN | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.60% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class Y | NEVADA | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.50% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class Y | OHIO | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.40% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class Y | IOWA | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.30% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class Y | DISTRICT OF COLUMBIA | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.30% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class Y | ALABAMA | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.20% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class Y | LOUISIANA | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.10% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class Y | KENTUCKY | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class Y | U S Related [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.90% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class Y | SOUTH CAROLINA | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.50% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class Y | TENNESSEE | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.20% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class Y | OREGON | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.20% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class Y | VIRGINIA | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.10% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class Y | ARKANSAS | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.10% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class Y | MINNESOTA | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class Y | Net Other Assets and Liabilities one [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.10% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class Z | Airport [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 12.50% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class Z | Education [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10.20% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class Z | Medical [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.30% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class Z | Development [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.30% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class Z | Transportation Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.30% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class Z | General Obligation [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.20% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class Z | Water & Sewer [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.20% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class Z | Power [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.50% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class Z | Nursing Homes [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.40% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class Z | School District [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.10% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class Z | Tobacco Settlement [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.90% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class Z | Utilities Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.20% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class Z | Multifamily Housing [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.20% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class Z | Net Other Assets and Liabilities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 24.70% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class Z | NEW YORK | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10.60% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class Z | TEXAS | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10.40% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class Z | PENNSYLVANIA | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.90% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class Z | ILLINOIS | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.70% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class Z | CALIFORNIA | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.90% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class Z | MICHIGAN | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.40% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class Z | COLORADO | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class Z | ARIZONA | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.90% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class Z | FLORIDA | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.90% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class Z | GEORGIA | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.70% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class Z | WASHINGTON | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.60% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class Z | NEW JERSEY | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.50% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class Z | WISCONSIN | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.60% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class Z | NEVADA | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.50% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class Z | OHIO | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.40% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class Z | IOWA | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.30% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class Z | DISTRICT OF COLUMBIA | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.30% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class Z | ALABAMA | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.20% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class Z | LOUISIANA | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.10% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class Z | KENTUCKY | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class Z | U S Related [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.90% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class Z | SOUTH CAROLINA | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.50% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class Z | TENNESSEE | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.20% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class Z | OREGON | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.20% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class Z | VIRGINIA | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.10% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class Z | ARKANSAS | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.10% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class Z | MINNESOTA | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1% |
| BNY Mellon Opportunistic Municipal Securities Fund - Class Z | Net Other Assets and Liabilities one [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.10% |