| Form N-CSR Cover | 6 Months Ended |
| Jun. 30, 2024 | |
| Shareholder Report [Line Items] | |
| Document Type | N-CSRS |
| Amendment Flag | false |
| Registrant Name | BNY Mellon New Jersey Municipal Bond Fund, Inc. |
| Entity Central Index Key | 0000828475 |
| Document Period End Date | Jun. 30, 2024 |
| Shareholder Report | 6 Months Ended | |
| Jun. 30, 2024 USD ($) | ||
| Shareholder Report [Line Items] | ||
| Document Type | N-CSRS | |
| Amendment Flag | false | |
| Registrant Name | BNY Mellon New Jersey Municipal Bond Fund, Inc. | |
| Entity Central Index Key | 0000828475 | |
| Document Period End Date | Jun. 30, 2024 | |
| Class A – DRNJX | ||
| Shareholder Report [Line Items] | ||
| Fund Name | BNY Mellon New Jersey Municipal Bond Fund, Inc. | |
| Class Name | Class A | |
| Trading Symbol | DRNJX | |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report | |
| Class C – DCNJX | ||
| Shareholder Report [Line Items] | ||
| Fund Name | BNY Mellon New Jersey Municipal Bond Fund, Inc. | |
| Class Name | Class C | |
| Trading Symbol | DCNJX | |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report | |
| Class I – DNMIX | ||
| Shareholder Report [Line Items] | ||
| Fund Name | BNY Mellon New Jersey Municipal Bond Fund, Inc. | |
| Class Name | Class I | |
| Trading Symbol | DNMIX | |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report | |
| Class Y – DNJYX | ||
| Shareholder Report [Line Items] | ||
| Fund Name | BNY Mellon New Jersey Municipal Bond Fund, Inc. | |
| Class Name | Class Y | |
| Trading Symbol | DNJYX | |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report | |
| Class Z– DZNJX | ||
| Shareholder Report [Line Items] | ||
| Fund Name | BNY Mellon New Jersey Municipal Bond Fund, Inc. | |
| Class Name | Class Z | |
| Trading Symbol | DZNJX | |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report | |
| BNY Mellon New Jersey Municipal Bond Fund, Inc. | Class A – DRNJX | ||
| Shareholder Report [Line Items] | ||
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about BNY Mellon New Jersey Municipal Bond Fund, Inc. (the “Fund”) for the period of January 1, 2024 to June 30, 2024. You can find additional information about the Fund at im.bnymellon.com/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 bnymellon.com. | |
| Additional Information [Text Block] | You can find additional information about the Fund at im.bnymellon.com/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@bnymellon.com. | |
| Additional Information Phone Number | 1-800-373-9387 | |
| Additional Information Email | info@bnymellon.com | |
| Additional Information Website | im.bnymellon.com/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 $41 0.82% * * Annualized | |
| Expenses Paid, Amount | $ 41 | |
| Expense Ratio, Percent | 0.82% | [1] |
| Net Assets | $ 314,000,000 | |
| Holdings Count | 116 | |
| Portfolio Turnover | 5.76% | |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS (AS OF 6/30/24) Fund Size (Millions) Number of Holdings Portfolio Turnover $314 116 5.76% | |
| Holdings [Text Block] | Portfolio Holdings (as of 6/30/24) Sector Allocation (Based on Net Assets) | |
| Updated Prospectus Web Address | im.bnymellon.com/literaturecenter | |
| BNY Mellon New Jersey Municipal Bond Fund, Inc. | Class C – DCNJX | ||
| Shareholder Report [Line Items] | ||
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about BNY Mellon New Jersey Municipal Bond Fund, Inc. (the “Fund”) for the period of January 1, 2024 to June 30, 2024. You can find additional information about the Fund at im.bnymellon.com/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 bnymellon.com. | |
| Additional Information [Text Block] | You can find additional information about the Fund at im.bnymellon.com/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@bnymellon.com. | |
| Additional Information Phone Number | 1-800-373-9387 | |
| Additional Information Email | info@bnymellon.com | |
| Additional Information Website | im.bnymellon.com/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 * $79 1.59% ** * 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 | $ 79 | [2] |
| Expense Ratio, Percent | 1.59% | [2],[3] |
| Net Assets | $ 314,000,000 | |
| Holdings Count | 116 | |
| Portfolio Turnover | 5.76% | |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS (AS OF 6/30/24) Fund Size (Millions) Number of Holdings Portfolio Turnover $314 116 5.76% | |
| Holdings [Text Block] | Portfolio Holdings (as of 6/30/24) Sector Allocation (Based on Net Assets) | |
| Updated Prospectus Web Address | im.bnymellon.com/literaturecenter | |
| BNY Mellon New Jersey Municipal Bond Fund, Inc. | Class I – DNMIX | ||
| Shareholder Report [Line Items] | ||
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about BNY Mellon New Jersey Municipal Bond Fund, Inc. (the “Fund”) for the period of January 1, 2024 to June 30, 2024. You can find additional information about the Fund at im.bnymellon.com/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 bnymellon.com. | |
| Additional Information [Text Block] | You can find additional information about the Fund at im.bnymellon.com/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@bnymellon.com. | |
| Additional Information Phone Number | 1-800-373-9387 | |
| Additional Information Email | info@bnymellon.com | |
| Additional Information Website | im.bnymellon.com/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 $29 0.58% * * Annualized | |
| Expenses Paid, Amount | $ 29 | |
| Expense Ratio, Percent | 0.58% | [4] |
| Net Assets | $ 314,000,000 | |
| Holdings Count | 116 | |
| Portfolio Turnover | 5.76% | |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS (AS OF 6/30/24) Fund Size (Millions) Number of Holdings Portfolio Turnover $314 116 5.76% | |
| Holdings [Text Block] | Portfolio Holdings (as of 6/30/24) Sector Allocation (Based on Net Assets) | |
| Updated Prospectus Web Address | im.bnymellon.com/literaturecenter | |
| BNY Mellon New Jersey Municipal Bond Fund, Inc. | Class Y – DNJYX | ||
| Shareholder Report [Line Items] | ||
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about BNY Mellon New Jersey Municipal Bond Fund, Inc. (the “Fund”) for the period of January 1, 2024 to June 30, 2024. You can find additional information about the Fund at im.bnymellon.com/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 bnymellon.com. | |
| Additional Information [Text Block] | You can find additional information about the Fund at im.bnymellon.com/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@bnymellon.com. | |
| Additional Information Phone Number | 1-800-373-9387 | |
| Additional Information Email | info@bnymellon.com | |
| Additional Information Website | im.bnymellon.com/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 $27 0.55% * * Annualized | |
| Expenses Paid, Amount | $ 27 | |
| Expense Ratio, Percent | 0.55% | [5] |
| Net Assets | $ 314,000,000 | |
| Holdings Count | 116 | |
| Portfolio Turnover | 5.76% | |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS (AS OF 6/30/24) Fund Size (Millions) Number of Holdings Portfolio Turnover $314 116 5.76% | |
| Holdings [Text Block] | Portfolio Holdings (as of 6/30/24) Sector Allocation (Based on Net Assets) | |
| Updated Prospectus Web Address | im.bnymellon.com/literaturecenter | |
| BNY Mellon New Jersey Municipal Bond Fund, Inc. | Class Z– DZNJX | ||
| Shareholder Report [Line Items] | ||
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about BNY Mellon New Jersey Municipal Bond Fund, Inc. (the “Fund”) for the period of January 1, 2024 to June 30, 2024. You can find additional information about the Fund at im.bnymellon.com/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 bnymellon.com. | |
| Additional Information [Text Block] | You can find additional information about the Fund at im.bnymellon.com/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@bnymellon.com. | |
| Additional Information Phone Number | 1-800-373-9387 | |
| Additional Information Email | info@bnymellon.com | |
| Additional Information Website | im.bnymellon.com/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 $33 0.66% * * Annualized | |
| Expenses Paid, Amount | $ 33 | |
| Expense Ratio, Percent | 0.66% | [6] |
| Net Assets | $ 314,000,000 | |
| Holdings Count | 116 | |
| Portfolio Turnover | 5.76% | |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS (AS OF 6/30/24) Fund Size (Millions) Number of Holdings Portfolio Turnover $314 116 5.76% | |
| Holdings [Text Block] | Portfolio Holdings (as of 6/30/24) Sector Allocation (Based on Net Assets) | |
| Updated Prospectus Web Address | im.bnymellon.com/literaturecenter | |
| [1] Annualized 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 Annualized Annualized Annualized | ||
| Shareholder Report, Holdings (Details) - BNY Mellon New Jersey Municipal Bond Fund, Inc. | Jun. 30, 2024 |
| Class A – DRNJX | Net Other Assets and Liabilities | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 25.80% |
| Class A – DRNJX | Pollution | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1% |
| Class A – DRNJX | Housing | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.30% |
| Class A – DRNJX | General Obligation | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.80% |
| Class A – DRNJX | Water | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.30% |
| Class A – DRNJX | Student Loan | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.90% |
| Class A – DRNJX | Tobacco Settlement | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.10% |
| Class A – DRNJX | Development | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.50% |
| Class A – DRNJX | Airport | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.60% |
| Class A – DRNJX | Transportation | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 13% |
| Class A – DRNJX | Education | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 13.60% |
| Class A – DRNJX | Medical | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 15.10% |
| Class C – DCNJX | Net Other Assets and Liabilities | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 25.80% |
| Class C – DCNJX | Pollution | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1% |
| Class C – DCNJX | Housing | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.30% |
| Class C – DCNJX | General Obligation | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.80% |
| Class C – DCNJX | Water | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.30% |
| Class C – DCNJX | Student Loan | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.90% |
| Class C – DCNJX | Tobacco Settlement | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.10% |
| Class C – DCNJX | Development | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.50% |
| Class C – DCNJX | Airport | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.60% |
| Class C – DCNJX | Transportation | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 13% |
| Class C – DCNJX | Education | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 13.60% |
| Class C – DCNJX | Medical | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 15.10% |
| Class I – DNMIX | Net Other Assets and Liabilities | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 25.80% |
| Class I – DNMIX | Pollution | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1% |
| Class I – DNMIX | Housing | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.30% |
| Class I – DNMIX | General Obligation | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.80% |
| Class I – DNMIX | Water | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.30% |
| Class I – DNMIX | Student Loan | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.90% |
| Class I – DNMIX | Tobacco Settlement | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.10% |
| Class I – DNMIX | Development | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.50% |
| Class I – DNMIX | Airport | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.60% |
| Class I – DNMIX | Transportation | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 13% |
| Class I – DNMIX | Education | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 13.60% |
| Class I – DNMIX | Medical | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 15.10% |
| Class Y – DNJYX | Net Other Assets and Liabilities | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 25.80% |
| Class Y – DNJYX | Pollution | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1% |
| Class Y – DNJYX | Housing | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.30% |
| Class Y – DNJYX | General Obligation | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.80% |
| Class Y – DNJYX | Water | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.30% |
| Class Y – DNJYX | Student Loan | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.90% |
| Class Y – DNJYX | Tobacco Settlement | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.10% |
| Class Y – DNJYX | Development | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.50% |
| Class Y – DNJYX | Airport | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.60% |
| Class Y – DNJYX | Transportation | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 13% |
| Class Y – DNJYX | Education | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 13.60% |
| Class Y – DNJYX | Medical | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 15.10% |
| Class Z– DZNJX | Net Other Assets and Liabilities | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 25.80% |
| Class Z– DZNJX | Pollution | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1% |
| Class Z– DZNJX | Housing | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.30% |
| Class Z– DZNJX | General Obligation | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.80% |
| Class Z– DZNJX | Water | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.30% |
| Class Z– DZNJX | Student Loan | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.90% |
| Class Z– DZNJX | Tobacco Settlement | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.10% |
| Class Z– DZNJX | Development | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.50% |
| Class Z– DZNJX | Airport | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.60% |
| Class Z– DZNJX | Transportation | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 13% |
| Class Z– DZNJX | Education | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 13.60% |
| Class Z– DZNJX | Medical | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 15.10% |
