| Form N-CSR Cover | 12 Months Ended |
| Oct. 31, 2024 | |
| Shareholder Report [Line Items] | |
| Document Type | N-CSR |
| Amendment Flag | false |
| Registrant Name | NEUBERGER BERMAN INCOME FUNDS |
| Entity Central Index Key | 0000723620 |
| Entity Investment Company Type | N-1A |
| Document Period End Date | Oct. 31, 2024 |
| Shareholder Report | 12 Months Ended |
| Oct. 31, 2024 USD ($) Holding | |
| Shareholder Report [Line Items] | |
| Document Type | N-CSR |
| Amendment Flag | false |
| Registrant Name | NEUBERGER BERMAN INCOME FUNDS |
| Entity Central Index Key | 0000723620 |
| Entity Investment Company Type | N-1A |
| Document Period End Date | Oct. 31, 2024 |
| C000129449 | |
| Shareholder Report [Line Items] | |
| Fund Name | Emerging Markets Debt Fund |
| Class Name | Institutional Class |
| Trading Symbol | NERIX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the Fund for the period of November 1, 2023 to October 31, 2024. |
| Shareholder Report Annual or Semi-Annual | Annual Shareholder Report |
| Additional Information [Text Block] | You can find additional information about the Fund at www.nb.com/en/us/products/mutual-funds/emerging-markets-debt-fund?section=documents issdl nb.com |
| Additional Information Phone Number | 800.366.6264 |
| Additional Information Email | issdl@nb.com</span>" id="sjs-B19"><span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left;">issdl@nb.com</span> |
| Additional Information Website | www.nb.com/en/us/products/mutual-funds/emerging-markets-debt-fund?section=documents</span>" id="sjs-B20"><span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left;">www.nb.com/en/us/products/mutual-funds/emerging-markets-debt-fund?section=documents</span> |
| Expenses [Text Block] | What were the Fund's costs for the year? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Institutional Class $83 0.78% |
| Expenses Paid, Amount | $ 83 |
| Expense Ratio, Percent | 0.78% |
| Factors Affecting Performance [Text Block] | How did the Fund perform last year? Performance was positive for the period, largely driven by allocations in hard currency positions. A stronger U.S. dollar limited gains from local currency allocations, as inflation and monetary policy continued to be significant market concerns. Progress in restructuring defaulted hard currency sovereigns benefited the Fund, particularly with its emphasis on high-yield issuers. Performance Attribution Top Contributors Top Detractors Derivatives Hard currency country allocations to high-yield credits - Argentina and Ecuador, and countries which progressed debt restructuring programs, including Sri Lanka, Ghana, and Zambia Local currency positioning in South Africa, Malaysia and Indonesia Corporate sectors including telecom, media, and technology (TMT), financials, consumer, and oil & gas Allocation to local currency relative to hard currency as hard currency markets outperformed over the period Bottom up positioning in local currency rates allocations to Brazil, while foreign exchange (FX) positioning was also a negative contributor in absolute terms over the period Futures contracts Forward FX contracts Swaps |
| Performance Past Does Not Indicate Future [Text] | The investment return and principal value of an investment will fluctuate so that an investor’s shares, when redeemed, may be worth more or less than their original cost. Results represent the Fund's past performance, which is not a good predictor of how the Fund will perform in the future. Current performance may be lower or higher than the performance data quoted. |
| Line Graph [Table Text Block] | Institutional Class $1,165,400 JPM EM Blend HC/LC 50-50 Index $1,184,500 50% JPM GBI-EM/25% JPM EMBI ® 10/31/14 $1,000,000 $1,000,000 $1,000,000 10/31/15 $893,600 $912,600 $912,400 10/31/16 $1,002,400 $1,011,600 $1,012,600 10/31/17 $1,070,200 $1,070,000 $1,070,900 10/31/18 $1,004,400 $1,018,900 $1,019,200 10/31/19 $1,137,600 $1,166,600 $1,168,500 10/31/20 $1,130,500 $1,159,600 $1,162,400 10/31/21 $1,169,900 $1,192,900 $1,194,100 10/31/22 $918,600 $946,200 $944,700 10/31/23 $1,023,000 $1,051,700 $1,049,100 10/31/24 $1,165,400 $1,184,500 $1,181,200 |
| Average Annual Return [Table Text Block] | Name 1 Year 5 Years 10 Years Institutional Class 13.92% 0.48% 1.54% JPM EM Blend HC/LC 50-50 Index 12.62% 0.30% 1.71% 50% JPM GBI-EM/25% JPM EMBI ® 12.59% 0.22% 1.68% |
| Performance Table Market Index Changed [Text Block] | On July 24, 2024, the Fund began comparing its performance to the J.P. Morgan Emerging Markets Blend Hard Currency/Local Currency 50-50 Index in order to satisfy a change in regulatory requirements. A blended benchmark, which is composed of 50% J.P. Morgan Government Bond Index—Emerging Markets (GBI-EM) Global Diversified, 25% J.P. Morgan Emerging Markets Bond Index (EMBI ® |
| AssetsNet | $ 147,995,938 |
| Holdings Count | Holding | 802 |
| Advisory Fees Paid, Amount | $ 494,940 |
| InvestmentCompanyPortfolioTurnover | 60% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics Net Assets $147,995,938 Number of Portfolio Holdings 802 Portfolio Turnover Rate 60% Total Investment Advisory Fees Paid $494,940 |
| Holdings [Text Block] | Portfolio by Investment Type (as a % of Total Net Assets) Foreign Government Securities 63.0% Corporate Bonds 28.2% Purchased Option Contracts 0.0% Short-Term Investments 6.5% Other Assets Less Liabilities 2.3% Footnote Reference Total 100.0% Footnote Description Footnote Includes the impact of the Fund's open positions in derivatives (other than options purchased), if any. Top Ten Countries (as a % of Total Investments Footnote Reference United States 7.3% Indonesia 6.1% Colombia 5.6% South Africa 5.6% Mexico 5.3% Brazil 5.1% China 4.6% India 4.5% Malaysia 4.1% Poland 3.5% Footnote Description Footnote Derivatives (other than options purchased), if any, are excluded from this calculation. |
| Largest Holdings [Text Block] | Top Ten Issuers (as a % of Total Investments Footnote Reference State Street Institutional U.S. Government Money Market Fund Premier Class 6.6% Indonesia Government 5.1% Republic of South Africa 5.1% Malaysia Government 3.8% China Government 3.4% Republic of Poland Government 3.1% India Government 3.1% Colombian TES 3.1% Czech Republic Government 2.3% Mexico Government 2.1% Footnote Description Footnote Derivatives (other than options purchased), if any, are excluded from this calculation. |
| Material Fund Change [Text Block] | |
| C000129447 | |
| Shareholder Report [Line Items] | |
| Fund Name | Emerging Markets Debt Fund |
| Class Name | Class A |
| Trading Symbol | NERAX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the Fund for the period of November 1, 2023 to October 31, 2024. |
| Shareholder Report Annual or Semi-Annual | Annual Shareholder Report |
| Additional Information [Text Block] | You can find additional information about the Fund at www.nb.com/en/us/products/mutual-funds/emerging-markets-debt-fund?section=documents fundinfo nb.com |
| Additional Information Phone Number | 800.877.9700 |
| Additional Information Email | fundinfo@nb.com</span>" id="sjs-B46"><span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left;">fundinfo@nb.com</span> |
| Additional Information Website | www.nb.com/en/us/products/mutual-funds/emerging-markets-debt-fund?section=documents</span>" id="sjs-B47"><span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left;">www.nb.com/en/us/products/mutual-funds/emerging-markets-debt-fund?section=documents</span> |
| Expenses [Text Block] | What were the Fund's costs for the year? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Class A $123 1.15% |
| Expenses Paid, Amount | $ 123 |
| Expense Ratio, Percent | 1.15% |
| Factors Affecting Performance [Text Block] | How did the Fund perform last year? Performance was positive for the period, largely driven by allocations in hard currency positions. A stronger U.S. dollar limited gains from local currency allocations, as inflation and monetary policy continued to be significant market concerns. Progress in restructuring defaulted hard currency sovereigns benefited the Fund, particularly with its emphasis on high-yield issuers. Performance Attribution Top Contributors Top Detractors Derivatives Hard currency country allocations to high-yield credits - Argentina and Ecuador, and countries which progressed debt restructuring programs, including Sri Lanka, Ghana, and Zambia Local currency positioning in South Africa, Malaysia and Indonesia Corporate sectors including telecom, media, and technology (TMT), financials, consumer, and oil & gas Allocation to local currency relative to hard currency as hard currency markets outperformed over the period Bottom up positioning in local currency rates allocations to Brazil, while foreign exchange (FX) positioning was also a negative contributor in absolute terms over the period Futures contracts Forward FX contracts Swaps |
| Performance Past Does Not Indicate Future [Text] | The investment return and principal value of an investment will fluctuate so that an investor’s shares, when redeemed, may be worth more or less than their original cost. Results represent the Fund's past performance, which is not a good predictor of how the Fund will perform in the future. Current performance may be lower or higher than the performance data quoted. |
| Line Graph [Table Text Block] | Class A (including sales charge) $10,728 JPM EM Blend HC/LC 50-50 Index $11,845 50% JPM GBI-EM/25% JPM EMBI ® 10/31/14 $9,575 $10,000 $10,000 10/31/15 $8,527 $9,126 $9,124 10/31/16 $9,529 $10,116 $10,126 10/31/17 $10,126 $10,700 $10,709 10/31/18 $9,467 $10,189 $10,192 10/31/19 $10,684 $11,666 $11,685 10/31/20 $10,576 $11,596 $11,624 10/31/21 $10,904 $11,929 $11,941 10/31/22 $8,525 $9,462 $9,447 10/31/23 $9,474 $10,517 $10,491 10/31/24 $10,728 $11,845 $11,812 |
| Average Annual Return [Table Text Block] | Name 1 Year 5 Years 10 Years Class A (at NAV) 13.24% 0.08% 1.14% Class A (including sales charge) 8.50% (0.78)% 0.71% JPM EM Blend HC/LC 50-50 Index 12.62% 0.30% 1.71% 50% JPM GBI-EM/25% JPM EMBI ® 12.59% 0.22% 1.68% |
| Performance Table Market Index Changed [Text Block] | On July 24, 2024, the Fund began comparing its performance to the J.P. Morgan Emerging Markets Blend Hard Currency/Local Currency 50-50 Index in order to satisfy a change in regulatory requirements. A blended benchmark, which is composed of 50% J.P. Morgan Government Bond Index—Emerging Markets (GBI-EM) Global Diversified, 25% J.P. Morgan Emerging Markets Bond Index (EMBI ® |
| AssetsNet | $ 147,995,938 |
| Holdings Count | Holding | 802 |
| Advisory Fees Paid, Amount | $ 494,940 |
| InvestmentCompanyPortfolioTurnover | 60% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics Net Assets $147,995,938 Number of Portfolio Holdings 802 Portfolio Turnover Rate 60% Total Investment Advisory Fees Paid $494,940 |
| Holdings [Text Block] | Portfolio by Investment Type (as a % of Total Net Assets) Foreign Government Securities 63.0% Corporate Bonds 28.2% Purchased Option Contracts 0.0% Short-Term Investments 6.5% Other Assets Less Liabilities 2.3% Footnote Reference Total 100.0% Footnote Description Footnote Includes the impact of the Fund's open positions in derivatives (other than options purchased), if any. Top Ten Countries (as a % of Total Investments Footnote Reference United States 7.3% Indonesia 6.1% Colombia 5.6% South Africa 5.6% Mexico 5.3% Brazil 5.1% China 4.6% India 4.5% Malaysia 4.1% Poland 3.5% Footnote Description Footnote Derivatives (other than options purchased), if any, are excluded from this calculation. |
| Largest Holdings [Text Block] | Top Ten Issuers (as a % of Total Investments Footnote Reference State Street Institutional U.S. Government Money Market Fund Premier Class 6.6% Indonesia Government 5.1% Republic of South Africa 5.1% Malaysia Government 3.8% China Government 3.4% Republic of Poland Government 3.1% India Government 3.1% Colombian TES 3.1% Czech Republic Government 2.3% Mexico Government 2.1% Footnote Description Footnote Derivatives (other than options purchased), if any, are excluded from this calculation. |
| Material Fund Change [Text Block] | |
| C000129448 | |
| Shareholder Report [Line Items] | |
| Fund Name | Emerging Markets Debt Fund |
| Class Name | Class C |
| Trading Symbol | NERCX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the Fund for the period of November 1, 2023 to October 31, 2024. |
| Shareholder Report Annual or Semi-Annual | Annual Shareholder Report |
| Additional Information [Text Block] | You can find additional information about the Fund at www.nb.com/en/us/products/mutual-funds/emerging-markets-debt-fund?section=documents fundinfo nb.com |
| Additional Information Phone Number | 800.877.9700 |
| Additional Information Email | fundinfo@nb.com</span>" id="sjs-B73"><span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left;">fundinfo@nb.com</span> |
| Additional Information Website | www.nb.com/en/us/products/mutual-funds/emerging-markets-debt-fund?section=documents</span>" id="sjs-B74"><span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left;">www.nb.com/en/us/products/mutual-funds/emerging-markets-debt-fund?section=documents</span> |
| Expenses [Text Block] | What were the Fund's costs for the year? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Class C $202 1.90% |
| Expenses Paid, Amount | $ 202 |
| Expense Ratio, Percent | 1.90% |
| Factors Affecting Performance [Text Block] | How did the Fund perform last year? Performance was positive for the period, largely driven by allocations in hard currency positions. A stronger U.S. dollar limited gains from local currency allocations, as inflation and monetary policy continued to be significant market concerns. Progress in restructuring defaulted hard currency sovereigns benefited the Fund, particularly with its emphasis on high-yield issuers. Performance Attribution Top Contributors Top Detractors Derivatives Hard currency country allocations to high-yield credits - Argentina and Ecuador, and countries which progressed debt restructuring programs, including Sri Lanka, Ghana, and Zambia Local currency positioning in South Africa, Malaysia and Indonesia Corporate sectors including telecom, media, and technology (TMT), financials, consumer, and oil & gas Allocation to local currency relative to hard currency as hard currency markets outperformed over the period Bottom up positioning in local currency rates allocations to Brazil, while foreign exchange (FX) positioning was also a negative contributor in absolute terms over the period Futures contracts Forward FX contracts Swaps |
| Performance Past Does Not Indicate Future [Text] | The investment return and principal value of an investment will fluctuate so that an investor’s shares, when redeemed, may be worth more or less than their original cost. Results represent the Fund's past performance, which is not a good predictor of how the Fund will perform in the future. Current performance may be lower or higher than the performance data quoted. |
| Line Graph [Table Text Block] | Class C (including sales charge) $10,406 JPM EM Blend HC/LC 50-50 Index $11,845 50% JPM GBI-EM/25% JPM EMBI ® 10/31/14 $10,000 $10,000 $10,000 10/31/15 $8,836 $9,126 $9,124 10/31/16 $9,802 $10,116 $10,126 10/31/17 $10,338 $10,700 $10,709 10/31/18 $9,593 $10,189 $10,192 10/31/19 $10,746 $11,666 $11,685 10/31/20 $10,571 $11,596 $11,624 10/31/21 $10,805 $11,929 $11,941 10/31/22 $8,385 $9,462 $9,447 10/31/23 $9,249 $10,517 $10,491 10/31/24 $10,406 $11,845 $11,812 |
| Average Annual Return [Table Text Block] | Name 1 Year 5 Years 10 Years Class C (at NAV) 12.50% (0.64)% 0.40% Class C (including sales charge) 11.50% (0.64)% 0.40% JPM EM Blend HC/LC 50-50 Index 12.62% 0.30% 1.71% 50% JPM GBI-EM/25% JPM EMBI ® 12.59% 0.22% 1.68% |
| Performance Table Market Index Changed [Text Block] | On July 24, 2024, the Fund began comparing its performance to the J.P. Morgan Emerging Markets Blend Hard Currency/Local Currency 50-50 Index in order to satisfy a change in regulatory requirements. A blended benchmark, which is composed of 50% J.P. Morgan Government Bond Index—Emerging Markets (GBI-EM) Global Diversified, 25% J.P. Morgan Emerging Markets Bond Index (EMBI ® |
| AssetsNet | $ 147,995,938 |
| Holdings Count | Holding | 802 |
| Advisory Fees Paid, Amount | $ 494,940 |
| InvestmentCompanyPortfolioTurnover | 60% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics Net Assets $147,995,938 Number of Portfolio Holdings 802 Portfolio Turnover Rate 60% Total Investment Advisory Fees Paid $494,940 |
| Holdings [Text Block] | Portfolio by Investment Type (as a % of Total Net Assets) Foreign Government Securities 63.0% Corporate Bonds 28.2% Purchased Option Contracts 0.0% Short-Term Investments 6.5% Other Assets Less Liabilities 2.3% Footnote Reference Total 100.0% Footnote Description Footnote Includes the impact of the Fund's open positions in derivatives (other than options purchased), if any. Top Ten Countries (as a % of Total Investments Footnote Reference United States 7.3% Indonesia 6.1% Colombia 5.6% South Africa 5.6% Mexico 5.3% Brazil 5.1% China 4.6% India 4.5% Malaysia 4.1% Poland 3.5% Footnote Description Footnote Derivatives (other than options purchased), if any, are excluded from this calculation. |
| Largest Holdings [Text Block] | Top Ten Issuers (as a % of Total Investments Footnote Reference State Street Institutional U.S. Government Money Market Fund Premier Class 6.6% Indonesia Government 5.1% Republic of South Africa 5.1% Malaysia Government 3.8% China Government 3.4% Republic of Poland Government 3.1% India Government 3.1% Colombian TES 3.1% Czech Republic Government 2.3% Mexico Government 2.1% Footnote Description Footnote Derivatives (other than options purchased), if any, are excluded from this calculation. |
| Material Fund Change [Text Block] | |
| C000082160 | |
| Shareholder Report [Line Items] | |
| Fund Name | Floating Rate Income Fund |
| Class Name | Institutional Class |
| Trading Symbol | NFIIX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the Fund for the period of November 1, 2023 to October 31, 2024. |
| Shareholder Report Annual or Semi-Annual | Annual Shareholder Report |
| Additional Information [Text Block] | You can find additional information about the Fund at www.nb.com/en/us/products/mutual-funds/floating-rate-income-fund?section=documents issdl nb.com |
| Additional Information Phone Number | 800.366.6264 |
| Additional Information Email | issdl@nb.com</span>" id="sjs-B100"><span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left;">issdl@nb.com</span> |
| Additional Information Website | www.nb.com/en/us/products/mutual-funds/floating-rate-income-fund?section=documents</span>" id="sjs-B101"><span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left;">www.nb.com/en/us/products/mutual-funds/floating-rate-income-fund?section=documents</span> |
| Expenses [Text Block] | What were the Fund's costs for the year? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Institutional Class $64 0.61% |
| Expenses Paid, Amount | $ 64 |
| Expense Ratio, Percent | 0.61% |
| Factors Affecting Performance [Text Block] | How did the Fund perform last year? Relative to the Morningstar LSTA U.S. Leveraged Loan Index (the Index), security selection within and an underweight to software and security selection within B-rated issuers were the top performers. Security selection within diversified telecommunications services and security selection within CCC-rated issuers were additive. An underweight to and security selection within Information Technology (IT) services and an overweight to BB-rated issuers versus the Index were the top detractors. Security selection within and an overweight to health care providers & services detracted, as did an underweight to pharmaceuticals. Performance Attribution Top Contributors Top Detractors Security selection within and an underweight to software versus the Index Security selection within B-rated issuers Security selection within diversified telecommunications services, and selection within CCC-rated issuers An underweight to and security selection within IT services An overweight to BB-rated issuers Security selection within and an overweight to health care providers & services Underweight to pharmaceuticals versus the Index |
| Performance Past Does Not Indicate Future [Text] | The investment return and principal value of an investment will fluctuate so that an investor’s shares, when redeemed, may be worth more or less than their original cost. Results represent the Fund's past performance, which is not a good predictor of how the Fund will perform in the future. Current performance may be lower or higher than the performance data quoted. |
| Line Graph [Table Text Block] | Institutional Class $1,558,100 Bloomberg U.S. Aggregate Bond Index $1,159,300 Morningstar LSTA U.S. Leveraged Loan Index $1,616,900 10/31/14 $1,000,000 $1,000,000 $1,000,000 10/31/15 $1,014,800 $1,019,600 $1,004,800 10/31/16 $1,060,600 $1,064,100 $1,070,400 10/31/17 $1,104,500 $1,073,700 $1,124,600 10/31/18 $1,142,600 $1,051,700 $1,175,600 10/31/19 $1,166,900 $1,172,700 $1,207,000 10/31/20 $1,199,800 $1,245,300 $1,227,800 10/31/21 $1,297,300 $1,239,300 $1,331,800 10/31/22 $1,258,800 $1,045,000 $1,306,800 10/31/23 $1,405,800 $1,048,700 $1,462,500 10/31/24 $1,558,100 $1,159,300 $1,616,900 |
| Average Annual Return [Table Text Block] | Name 1 Year 5 Years 10 Years Institutional Class 10.83% 5.95% 4.53% Bloomberg U.S. Aggregate Bond Index 10.55% (0.23)% 1.49% Morningstar LSTA U.S. Leveraged Loan Index 10.56% 6.02% 4.92% |
| Performance Table Market Index Changed [Text Block] | On July 24, 2024, the Fund began comparing its performance to the Bloomberg U.S. Aggregate Bond Index in order to satisfy a change in regulatory requirements. The Morningstar LSTA U.S. Leveraged Loan Index will be maintained as a secondary index as it shows how the Fund’s performance compares to an index with characteristics that are more representative of the Fund's investment strategy than the Bloomberg U.S. Aggregate Bond Index. |
| AssetsNet | $ 449,298,707 |
| Holdings Count | Holding | 373 |
| Advisory Fees Paid, Amount | $ 1,416,768 |
| InvestmentCompanyPortfolioTurnover | 76% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics Net Assets $449,298,707 Number of Portfolio Holdings 373 Portfolio Turnover Rate 76% Total Investment Advisory Fees Paid $1,416,768 |
| Holdings [Text Block] | Top Ten Industry Allocation (as a % of Total Investments Footnote Reference Health Care 8.0 % Electronics - Electrical 7.6 % Investment Companies 7.3 % Business Equipment & Services 5.6 % Financial Intermediaries 3.6 % Oil & Gas 3.6 % Utilities 3.6 % Industrial Equipment 3.2 % Aerospace & Defense 3.1 % Chemicals 2.9% Footnote Description Footnote Derivatives (other than options purchased), if any, are excluded from this calculation. |
| Largest Holdings [Text Block] | Top Ten Issuers (as a % of Total Investments Footnote Reference State Street Institutional U.S. Government Money Market Fund Premier Class 7.3% Southern Veterinary Partners LLC 0.7% Zayo Group Holdings, Inc. 0.6% Waterbridge Midstream Operating LLC 0.6% Peraton Corp. 0.6% CSC Holdings LLC 0.6% Boost Newco Borrower LLC 0.6% Star Parent, Inc. 0.6% Aveanna Healthcare LLC 0.6% Athenahealth Group, Inc. 0.6% Footnote Description Footnote Derivatives (other than options purchased), if any, are excluded from this calculation. |
| Material Fund Change [Text Block] | |
| C000082158 | |
| Shareholder Report [Line Items] | |
| Fund Name | Floating Rate Income Fund |
| Class Name | Class A |
| Trading Symbol | NFIAX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the Fund for the period of November 1, 2023 to October 31, 2024. |
| Shareholder Report Annual or Semi-Annual | Annual Shareholder Report |
| Additional Information [Text Block] | You can find additional information about the Fund at www.nb.com/en/us/products/mutual-funds/floating-rate-income-fund?section=documents fundinfo nb.com |
| Additional Information Phone Number | 800.877.9700 |
| Additional Information Email | fundinfo@nb.com</span>" id="sjs-B127"><span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left;">fundinfo@nb.com</span> |
| Additional Information Website | www.nb.com/en/us/products/mutual-funds/floating-rate-income-fund?section=documents</span>" id="sjs-B128"><span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left;">www.nb.com/en/us/products/mutual-funds/floating-rate-income-fund?section=documents</span> |
| Expenses [Text Block] | What were the Fund's costs for the year? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Class A $103 0.98% |
| Expenses Paid, Amount | $ 103 |
| Expense Ratio, Percent | 0.98% |
| Factors Affecting Performance [Text Block] | How did the Fund perform last year? Relative to the Morningstar LSTA U.S. Leveraged Loan Index (the Index), security selection within and an underweight to software and security selection within B-rated issuers were the top performers. Security selection within diversified telecommunications services and security selection within CCC-rated issuers were additive. An underweight to and security selection within Information Technology (IT) services and an overweight to BB-rated issuers versus the Index were the top detractors. Security selection within and an overweight to health care providers & services detracted, as did an underweight to pharmaceuticals. Performance Attribution Top Contributors Top Detractors Security selection within and an underweight to software versus the Index Security selection within B-rated issuers Security selection within diversified telecommunications services, and selection within CCC-rated issuers An underweight to and security selection within IT services An overweight to BB-rated issuers Security selection within and an overweight to health care providers & services Underweight to pharmaceuticals versus the Index |
| Performance Past Does Not Indicate Future [Text] | The investment return and principal value of an investment will fluctuate so that an investor’s shares, when redeemed, may be worth more or less than their original cost. Results represent the Fund's past performance, which is not a good predictor of how the Fund will perform in the future. Current performance may be lower or higher than the performance data quoted. |
| Line Graph [Table Text Block] | Class A (including sales charge) $14,376 Bloomberg U.S. Aggregate Bond Index $11,593 Morningstar LSTA U.S. Leveraged Loan Index $16,169 10/31/14 $9,575 $10,000 $10,000 10/31/15 $9,670 $10,196 $10,048 10/31/16 $10,080 $10,641 $10,704 10/31/17 $10,458 $10,737 $11,246 10/31/18 $10,779 $10,517 $11,756 10/31/19 $10,968 $11,727 $12,070 10/31/20 $11,236 $12,453 $12,278 10/31/21 $12,104 $12,393 $13,318 10/31/22 $11,701 $10,450 $13,068 10/31/23 $13,019 $10,487 $14,625 10/31/24 $14,376 $11,593 $16,169 |
| Average Annual Return [Table Text Block] | Name 1 Year 5 Years 10 Years Class A (at NAV) 10.42% 5.56% 4.15% Class A (including sales charge) 5.75% 4.66% 3.70% Bloomberg U.S. Aggregate Bond Index 10.55% (0.23)% 1.49% Morningstar LSTA U.S. Leveraged Loan Index 10.56% 6.02% 4.92% |
| Performance Table Market Index Changed [Text Block] | On July 24, 2024, the Fund began comparing its performance to the Bloomberg U.S. Aggregate Bond Index in order to satisfy a change in regulatory requirements. The Morningstar LSTA U.S. Leveraged Loan Index will be maintained as a secondary index as it shows how the Fund’s performance compares to an index with characteristics that are more representative of the Fund's investment strategy than the Bloomberg U.S. Aggregate Bond Index. |
| AssetsNet | $ 449,298,707 |
| Holdings Count | Holding | 373 |
| Advisory Fees Paid, Amount | $ 1,416,768 |
| InvestmentCompanyPortfolioTurnover | 76% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics Net Assets $449,298,707 Number of Portfolio Holdings 373 Portfolio Turnover Rate 76% Total Investment Advisory Fees Paid $1,416,768 |
| Holdings [Text Block] | Top Ten Industry Allocation (as a % of Total Investments Footnote Reference Health Care 8.0 % Electronics - Electrical 7.6 % Investment Companies 7.3 % Business Equipment & Services 5.6 % Financial Intermediaries 3.6 % Oil & Gas 3.6 % Utilities 3.6 % Industrial Equipment 3.2 % Aerospace & Defense 3.1 % Chemicals 2.9% Footnote Description Footnote Derivatives (other than options purchased), if any, are excluded from this calculation. |
| Largest Holdings [Text Block] | Top Ten Issuers (as a % of Total Investments Footnote Reference State Street Institutional U.S. Government Money Market Fund Premier Class 7.3% Southern Veterinary Partners LLC 0.7% Zayo Group Holdings, Inc. 0.6% Waterbridge Midstream Operating LLC 0.6% Peraton Corp. 0.6% CSC Holdings LLC 0.6% Boost Newco Borrower LLC 0.6% Star Parent, Inc. 0.6% Aveanna Healthcare LLC 0.6% Athenahealth Group, Inc. 0.6% Footnote Description Footnote Derivatives (other than options purchased), if any, are excluded from this calculation. |
| Material Fund Change [Text Block] | |
| C000082159 | |
| Shareholder Report [Line Items] | |
| Fund Name | Floating Rate Income Fund |
| Class Name | Class C |
| Trading Symbol | NFICX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the Fund for the period of November 1, 2023 to October 31, 2024. |
| Shareholder Report Annual or Semi-Annual | Annual Shareholder Report |
| Additional Information [Text Block] | You can find additional information about the Fund at www.nb.com/en/us/products/mutual-funds/floating-rate-income-fund?section=documents fundinfo nb.com |
| Additional Information Phone Number | 800.877.9700 |
| Additional Information Email | fundinfo@nb.com</span>" id="sjs-B154"><span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left;">fundinfo@nb.com</span> |
| Additional Information Website | www.nb.com/en/us/products/mutual-funds/floating-rate-income-fund?section=documents</span>" id="sjs-B155"><span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left;">www.nb.com/en/us/products/mutual-funds/floating-rate-income-fund?section=documents</span> |
| Expenses [Text Block] | What were the Fund's costs for the year? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Class C $181 1.73% |
| Expenses Paid, Amount | $ 181 |
| Expense Ratio, Percent | 1.73% |
| Factors Affecting Performance [Text Block] | How did the Fund perform last year? Relative to the Morningstar LSTA U.S. Leveraged Loan Index (the Index), security selection within and an underweight to software and security selection within B-rated issuers were the top performers. Security selection within diversified telecommunications services and security selection within CCC-rated issuers were additive. An underweight to and security selection within Information Technology (IT) services and an overweight to BB-rated issuers versus the Index were the top detractors. Security selection within and an overweight to health care providers & services detracted, as did an underweight to pharmaceuticals. Performance Attribution Top Contributors Top Detractors Security selection within and an underweight to software versus the Index Security selection within B-rated issuers Security selection within diversified telecommunications services, and selection within CCC-rated issuers An underweight to and security selection within IT services An overweight to BB-rated issuers Security selection within and an overweight to health care providers & services Underweight to pharmaceuticals versus the Index |
| Performance Past Does Not Indicate Future [Text] | The investment return and principal value of an investment will fluctuate so that an investor’s shares, when redeemed, may be worth more or less than their original cost. Results represent the Fund's past performance, which is not a good predictor of how the Fund will perform in the future. Current performance may be lower or higher than the performance data quoted. |
| Line Graph [Table Text Block] | Class C (including sales charge) $13,918 Bloomberg U.S. Aggregate Bond Index $11,593 Morningstar LSTA U.S. Leveraged Loan Index $16,169 10/31/14 $10,000 $10,000 $10,000 10/31/15 $10,035 $10,196 $10,048 10/31/16 $10,372 $10,641 $10,704 10/31/17 $10,682 $10,737 $11,246 10/31/18 $10,927 $10,517 $11,756 10/31/19 $11,035 $11,727 $12,070 10/31/20 $11,221 $12,453 $12,278 10/31/21 $11,985 $12,393 $13,318 10/31/22 $11,510 $10,450 $13,068 10/31/23 $12,711 $10,487 $14,625 10/31/24 $13,918 $11,593 $16,169 |
| Average Annual Return [Table Text Block] | Name 1 Year 5 Years 10 Years Class C (at NAV) 9.49% 4.75% 3.36% Class C (including sales charge) 8.49% 4.75% 3.36% Bloomberg U.S. Aggregate Bond Index 10.55% (0.23)% 1.49% Morningstar LSTA U.S. Leveraged Loan Index 10.56% 6.02% 4.92% |
| Performance Table Market Index Changed [Text Block] | On July 24, 2024, the Fund began comparing its performance to the Bloomberg U.S. Aggregate Bond Index in order to satisfy a change in regulatory requirements. The Morningstar LSTA U.S. Leveraged Loan Index will be maintained as a secondary index as it shows how the Fund’s performance compares to an index with characteristics that are more representative of the Fund's investment strategy than the Bloomberg U.S. Aggregate Bond Index. |
| AssetsNet | $ 449,298,707 |
| Holdings Count | Holding | 373 |
| Advisory Fees Paid, Amount | $ 1,416,768 |
| InvestmentCompanyPortfolioTurnover | 76% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics Net Assets $449,298,707 Number of Portfolio Holdings 373 Portfolio Turnover Rate 76% Total Investment Advisory Fees Paid $1,416,768 |
| Holdings [Text Block] | Top Ten Industry Allocation (as a % of Total Investments Footnote Reference Health Care 8.0 % Electronics - Electrical 7.6 % Investment Companies 7.3 % Business Equipment & Services 5.6 % Financial Intermediaries 3.6 % Oil & Gas 3.6 % Utilities 3.6 % Industrial Equipment 3.2 % Aerospace & Defense 3.1 % Chemicals 2.9% Footnote Description Footnote Derivatives (other than options purchased), if any, are excluded from this calculation. |
| Largest Holdings [Text Block] | Top Ten Issuers (as a % of Total Investments Footnote Reference State Street Institutional U.S. Government Money Market Fund Premier Class 7.3% Southern Veterinary Partners LLC 0.7% Zayo Group Holdings, Inc. 0.6% Waterbridge Midstream Operating LLC 0.6% Peraton Corp. 0.6% CSC Holdings LLC 0.6% Boost Newco Borrower LLC 0.6% Star Parent, Inc. 0.6% Aveanna Healthcare LLC 0.6% Athenahealth Group, Inc. 0.6% Footnote Description Footnote Derivatives (other than options purchased), if any, are excluded from this calculation. |
| Material Fund Change [Text Block] | |
| C000021322 | |
| Shareholder Report [Line Items] | |
| Fund Name | High Income Bond Fund |
| Class Name | Investor Class |
| Trading Symbol | NHINX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the Fund for the period of November 1, 2023 to October 31, 2024. |
| Shareholder Report Annual or Semi-Annual | Annual Shareholder Report |
| Additional Information [Text Block] | You can find additional information about the Fund at www.nb.com/en/us/products/mutual-funds/high-income-bond-fund?section=documents fundinfo nb.com |
| Additional Information Phone Number | 800.877.9700 |
| Additional Information Email | fundinfo@nb.com</span>" id="sjs-B181"><span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left;">fundinfo@nb.com</span> |
| Additional Information Website | www.nb.com/en/us/products/mutual-funds/high-income-bond-fund?section=documents</span>" id="sjs-B182"><span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left;">www.nb.com/en/us/products/mutual-funds/high-income-bond-fund?section=documents</span> |
| Expenses [Text Block] | What were the Fund's costs for the year? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Investor Class $95 0.88% |
| Expenses Paid, Amount | $ 95 |
| Expense Ratio, Percent | 0.88% |
| Factors Affecting Performance [Text Block] | How did the Fund perform last year? Relative to the ICE BofA U.S. High Yield Constrained Index (the Index), security selection within and an underweight within BB-rated securities contributed. Security selection within the Telecommunications and Utilities sectors, as well as an underweight and security selection within the Energy sector bolstered returns. Performance was negatively impacted by security selection within the CCC and below rated securities. An underweight and security selection in both the Healthcare and Diversified Financial Services sectors also detracted from the Fund's overall results. Performance Attribution Top Contributors Top Detractors Security selection and an underweight versus the Index within BB-rated securities Security selection within B-rated securities Security selection within the Telecommunications and Utilities sectors Underweight and security selection within Energy sector Security selection within CCC and below rated securities Underweight versus the Index and security selection within the Health Care and Diversified Financial Services sectors |
| Performance Past Does Not Indicate Future [Text] | The investment return and principal value of an investment will fluctuate so that an investor’s shares, when redeemed, may be worth more or less than their original cost. Results represent the Fund's past performance, which is not a good predictor of how the Fund will perform in the future. Current performance may be lower or higher than the performance data quoted. |
| Line Graph [Table Text Block] | Investor Class $14,449 Bloomberg U.S. Aggregate Bond Index $11,593 ICE BofA U.S. High Yield Constrained Index $15,939 10/31/14 $10,000 $10,000 $10,000 10/31/15 $9,739 $10,196 $9,797 10/31/16 $10,508 $10,641 $10,795 10/31/17 $11,227 $10,737 $11,781 10/31/18 $11,243 $10,517 $11,883 10/31/19 $12,111 $11,727 $12,872 10/31/20 $12,456 $12,453 $13,187 10/31/21 $13,603 $12,393 $14,604 10/31/22 $12,022 $10,450 $12,932 10/31/23 $12,507 $10,487 $13,683 10/31/24 $14,449 $11,593 $15,939 |
| Average Annual Return [Table Text Block] | Name 1 Year 5 Years 10 Years Investor Class 15.52% 3.59% 3.75% Bloomberg U.S. Aggregate Bond Index 10.55% (0.23)% 1.49% ICE BofA U.S. High Yield Constrained Index 16.49% 4.37% 4.77% |
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or on the redemption of Fund shares. |
| Performance Table Market Index Changed [Text Block] | On July 24, 2024, the Fund began comparing its performance to the Bloomberg U.S. Aggregate Bond Index in order to satisfy a change in regulatory requirements. The ICE BofA U.S. High Yield Constrained Index will be maintained as a secondary index as it shows how the Fund’s performance compares to an index with characteristics that are more representative of the Fund's investment strategy than the Bloomberg U.S. Aggregate Bond Index. |
| AssetsNet | $ 628,340,418 |
| Holdings Count | Holding | 604 |
| Advisory Fees Paid, Amount | $ 3,086,786 |
| InvestmentCompanyPortfolioTurnover | 102% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics Net Assets $628,340,418 Number of Portfolio Holdings 604 Portfolio Turnover Rate 102% Total Investment Advisory Fees Paid $3,086,786 |
| Holdings [Text Block] | Top Ten Industry Allocation (as a % of Total Investments Footnote Reference Media 6.2 % Pipelines 5.4 % Commercial Services 5.2 % Chemicals 5.0 % Electric 4.7 % Telecommunications 4.5 % Retail 4.4 % Diversified Financial Services 4.0 % Insurance 3.9 % Healthcare - Services 3.5% Footnote Description Footnote Derivatives (other than options purchased), if any, are excluded from this calculation. |
| Largest Holdings [Text Block] | Top Ten Issuers (as a % of Total Investments Footnote Reference State Street Institutional U.S. Government Money Market Fund Premier Class 2.7% CCO Holdings LLC/CCO Holdings Capital Corp. 2.3% TransDigm, Inc. 1.5% CSC Holdings LLC 1.3% NRG Energy, Inc. 1.0% Medline Borrower LP 0.9% Venture Global LNG, Inc. 0.9% Vistra Operations Co. LLC 0.8% Olympus Water U.S. Holding Corp. 0.8% Alliant Holdings Intermediate LLC/Alliant Holdings Co-Issuer 0.8% Footnote Description Footnote Derivatives (other than options purchased), if any, are excluded from this calculation. |
| Material Fund Change [Text Block] | |
| C000064460 | |
| Shareholder Report [Line Items] | |
| Fund Name | High Income Bond Fund |
| Class Name | Institutional Class |
| Trading Symbol | NHILX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the Fund for the period of November 1, 2023 to October 31, 2024. |
| Shareholder Report Annual or Semi-Annual | Annual Shareholder Report |
| Additional Information [Text Block] | You can find additional information about the Fund at www.nb.com/en/us/products/mutual-funds/high-income-bond-fund?section=documents issdl nb.com |
| Additional Information Phone Number | 800.366.6264 |
| Additional Information Email | issdl@nb.com</span>" id="sjs-B209"><span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left;">issdl@nb.com</span> |
| Additional Information Website | www.nb.com/en/us/products/mutual-funds/high-income-bond-fund?section=documents</span>" id="sjs-B210"><span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left;">www.nb.com/en/us/products/mutual-funds/high-income-bond-fund?section=documents</span> |
| Expenses [Text Block] | What were the Fund's costs for the year? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Institutional Class $77 0.71% |
| Expenses Paid, Amount | $ 77 |
| Expense Ratio, Percent | 0.71% |
| Factors Affecting Performance [Text Block] | How did the Fund perform last year? Relative to the ICE BofA U.S. High Yield Constrained Index (the Index), security selection within and an underweight within BB-rated securities contributed. Security selection within the Telecommunications and Utilities sectors, as well as an underweight and security selection within the Energy sector bolstered returns. Performance was negatively impacted by security selection within the CCC and below rated securities. An underweight and security selection in both the Healthcare and Diversified Financial Services sectors also detracted from the Fund's overall results. Performance Attribution Top Contributors Top Detractors Security selection and an underweight versus the Index within BB-rated securities Security selection within B-rated securities Security selection within the Telecommunications and Utilities sectors Underweight and security selection within Energy sector Security selection within CCC and below rated securities Underweight versus the Index and security selection within the Health Care and Diversified Financial Services sectors |
| Performance Past Does Not Indicate Future [Text] | The investment return and principal value of an investment will fluctuate so that an investor’s shares, when redeemed, may be worth more or less than their original cost. Results represent the Fund's past performance, which is not a good predictor of how the Fund will perform in the future. Current performance may be lower or higher than the performance data quoted. |
| Line Graph [Table Text Block] | Institutional Class $1,467,300 Bloomberg U.S. Aggregate Bond Index $1,159,300 ICE BofA U.S. High Yield Constrained Index $1,593,900 10/31/14 $1,000,000 $1,000,000 $1,000,000 10/31/15 $975,400 $1,019,600 $979,700 10/31/16 $1,055,100 $1,064,100 $1,079,500 10/31/17 $1,127,100 $1,073,700 $1,178,100 10/31/18 $1,130,600 $1,051,700 $1,188,300 10/31/19 $1,219,800 $1,172,700 $1,287,200 10/31/20 $1,256,600 $1,245,300 $1,318,700 10/31/21 $1,374,400 $1,239,300 $1,460,400 10/31/22 $1,216,900 $1,045,000 $1,293,200 10/31/23 $1,268,100 $1,048,700 $1,368,300 10/31/24 $1,467,300 $1,159,300 $1,593,900 |
| Average Annual Return [Table Text Block] | Name 1 Year 5 Years 10 Years Institutional Class 15.71% 3.76% 3.91% Bloomberg U.S. Aggregate Bond Index 10.55% (0.23)% 1.49% ICE BofA U.S. High Yield Constrained Index 16.49% 4.37% 4.77% |
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or on the redemption of Fund shares. |
| Performance Table Market Index Changed [Text Block] | On July 24, 2024, the Fund began comparing its performance to the Bloomberg U.S. Aggregate Bond Index in order to satisfy a change in regulatory requirements. The ICE BofA U.S. High Yield Constrained Index will be maintained as a secondary index as it shows how the Fund’s performance compares to an index with characteristics that are more representative of the Fund's investment strategy than the Bloomberg U.S. Aggregate Bond Index. |
| AssetsNet | $ 628,340,418 |
| Holdings Count | Holding | 604 |
| Advisory Fees Paid, Amount | $ 3,086,786 |
| InvestmentCompanyPortfolioTurnover | 102% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics Net Assets $628,340,418 Number of Portfolio Holdings 604 Portfolio Turnover Rate 102% Total Investment Advisory Fees Paid $3,086,786 |
| Holdings [Text Block] | Top Ten Industry Allocation (as a % of Total Investments Footnote Reference Media 6.2 % Pipelines 5.4 % Commercial Services 5.2 % Chemicals 5.0 % Electric 4.7 % Telecommunications 4.5 % Retail 4.4 % Diversified Financial Services 4.0 % Insurance 3.9 % Healthcare - Services 3.5% Footnote Description Footnote Derivatives (other than options purchased), if any, are excluded from this calculation. |
| Largest Holdings [Text Block] | Top Ten Issuers (as a % of Total Investments Footnote Reference State Street Institutional U.S. Government Money Market Fund Premier Class 2.7% CCO Holdings LLC/CCO Holdings Capital Corp. 2.3% TransDigm, Inc. 1.5% CSC Holdings LLC 1.3% NRG Energy, Inc. 1.0% Medline Borrower LP 0.9% Venture Global LNG, Inc. 0.9% Vistra Operations Co. LLC 0.8% Olympus Water U.S. Holding Corp. 0.8% Alliant Holdings Intermediate LLC/Alliant Holdings Co-Issuer 0.8% Footnote Description Footnote Derivatives (other than options purchased), if any, are excluded from this calculation. |
| Material Fund Change [Text Block] | |
| C000077167 | |
| Shareholder Report [Line Items] | |
| Fund Name | High Income Bond Fund |
| Class Name | Class A |
| Trading Symbol | NHIAX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the Fund for the period of November 1, 2023 to October 31, 2024. |
| Shareholder Report Annual or Semi-Annual | Annual Shareholder Report |
| Additional Information [Text Block] | You can find additional information about the Fund at www.nb.com/en/us/products/mutual-funds/high-income-bond-fund?section=documents fundinfo nb.com |
| Additional Information Phone Number | 800.877.9700 |
| Additional Information Email | fundinfo@nb.com</span>" id="sjs-B237"><span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left;">fundinfo@nb.com</span> |
| Additional Information Website | www.nb.com/en/us/products/mutual-funds/high-income-bond-fund?section=documents</span>" id="sjs-B238"><span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left;">www.nb.com/en/us/products/mutual-funds/high-income-bond-fund?section=documents</span> |
| Expenses [Text Block] | What were the Fund's costs for the year? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Class A $118 1.10% |
| Expenses Paid, Amount | $ 118 |
| Expense Ratio, Percent | 1.10% |
| Factors Affecting Performance [Text Block] | How did the Fund perform last year? Relative to the ICE BofA U.S. High Yield Constrained Index (the Index), security selection within and an underweight within BB-rated securities contributed. Security selection within the Telecommunications and Utilities sectors, as well as an underweight and security selection within the Energy sector bolstered returns. Performance was negatively impacted by security selection within the CCC and below rated securities. An underweight and security selection in both the Healthcare and Diversified Financial Services sectors also detracted from the Fund's overall results. Performance Attribution Top Contributors Top Detractors Security selection and an underweight versus the Index within BB-rated securities Security selection within B-rated securities Security selection within the Telecommunications and Utilities sectors Underweight and security selection within Energy sector Security selection within CCC and below rated securities Underweight versus the Index and security selection within the Health Care and Diversified Financial Services sectors |
| Performance Past Does Not Indicate Future [Text] | The investment return and principal value of an investment will fluctuate so that an investor’s shares, when redeemed, may be worth more or less than their original cost. Results represent the Fund's past performance, which is not a good predictor of how the Fund will perform in the future. Current performance may be lower or higher than the performance data quoted. |
| Line Graph [Table Text Block] | Class A (including sales charge) $13,481 Bloomberg U.S. Aggregate Bond Index $11,593 ICE BofA U.S. High Yield Constrained Index $15,939 10/31/14 $9,575 $10,000 $10,000 10/31/15 $9,303 $10,196 $9,797 10/31/16 $10,015 $10,641 $10,795 10/31/17 $10,665 $10,737 $11,781 10/31/18 $10,651 $10,517 $11,883 10/31/19 $11,443 $11,727 $12,872 10/31/20 $11,737 $12,453 $13,187 10/31/21 $12,782 $12,393 $14,604 10/31/22 $11,267 $10,450 $12,932 10/31/23 $11,695 $10,487 $13,683 10/31/24 $13,481 $11,593 $15,939 |
| Average Annual Return [Table Text Block] | Name 1 Year 5 Years 10 Years Class A (at NAV) 15.28% 3.33% 3.48% Class A (including sales charge) 10.45% 2.43% 3.03% Bloomberg U.S. Aggregate Bond Index 10.55% (0.23)% 1.49% ICE BofA U.S. High Yield Constrained Index 16.49% 4.37% 4.77% |
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or on the redemption of Fund shares. |
| Performance Table Market Index Changed [Text Block] | On July 24, 2024, the Fund began comparing its performance to the Bloomberg U.S. Aggregate Bond Index in order to satisfy a change in regulatory requirements. The ICE BofA U.S. High Yield Constrained Index will be maintained as a secondary index as it shows how the Fund’s performance compares to an index with characteristics that are more representative of the Fund's investment strategy than the Bloomberg U.S. Aggregate Bond Index. |
| AssetsNet | $ 628,340,418 |
| Holdings Count | Holding | 604 |
| Advisory Fees Paid, Amount | $ 3,086,786 |
| InvestmentCompanyPortfolioTurnover | 102% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics Net Assets $628,340,418 Number of Portfolio Holdings 604 Portfolio Turnover Rate 102% Total Investment Advisory Fees Paid $3,086,786 |
| Holdings [Text Block] | Top Ten Industry Allocation (as a % of Total Investments Footnote Reference Media 6.2 % Pipelines 5.4 % Commercial Services 5.2 % Chemicals 5.0 % Electric 4.7 % Telecommunications 4.5 % Retail 4.4 % Diversified Financial Services 4.0 % Insurance 3.9 % Healthcare - Services 3.5% Footnote Description Footnote Derivatives (other than options purchased), if any, are excluded from this calculation. |
| Largest Holdings [Text Block] | Top Ten Issuers (as a % of Total Investments Footnote Reference State Street Institutional U.S. Government Money Market Fund Premier Class 2.7% CCO Holdings LLC/CCO Holdings Capital Corp. 2.3% TransDigm, Inc. 1.5% CSC Holdings LLC 1.3% NRG Energy, Inc. 1.0% Medline Borrower LP 0.9% Venture Global LNG, Inc. 0.9% Vistra Operations Co. LLC 0.8% Olympus Water U.S. Holding Corp. 0.8% Alliant Holdings Intermediate LLC/Alliant Holdings Co-Issuer 0.8% Footnote Description Footnote Derivatives (other than options purchased), if any, are excluded from this calculation. |
| Material Fund Change [Text Block] | |
| C000077168 | |
| Shareholder Report [Line Items] | |
| Fund Name | High Income Bond Fund |
| Class Name | Class C |
| Trading Symbol | NHICX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the Fund for the period of November 1, 2023 to October 31, 2024. |
| Shareholder Report Annual or Semi-Annual | Annual Shareholder Report |
| Additional Information [Text Block] | You can find additional information about the Fund at www.nb.com/en/us/products/mutual-funds/high-income-bond-fund?section=documents fundinfo nb.com |
| Additional Information Phone Number | 800.877.9700 |
| Additional Information Email | fundinfo@nb.com</span>" id="sjs-B265"><span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left;">fundinfo@nb.com</span> |
| Additional Information Website | www.nb.com/en/us/products/mutual-funds/high-income-bond-fund?section=documents</span>" id="sjs-B266"><span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left;">www.nb.com/en/us/products/mutual-funds/high-income-bond-fund?section=documents</span> |
| Expenses [Text Block] | What were the Fund's costs for the year? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Class C $200 1.87% |
| Expenses Paid, Amount | $ 200 |
| Expense Ratio, Percent | 1.87% |
| Factors Affecting Performance [Text Block] | How did the Fund perform last year? Relative to the ICE BofA U.S. High Yield Constrained Index (the Index), security selection within and an underweight within BB-rated securities contributed. Security selection within the Telecommunications and Utilities sectors, as well as an underweight and security selection within the Energy sector bolstered returns. Performance was negatively impacted by security selection within the CCC and below rated securities. An underweight and security selection in both the Healthcare and Diversified Financial Services sectors also detracted from the Fund's overall results. Performance Attribution Top Contributors Top Detractors Security selection and an underweight versus the Index within BB-rated securities Security selection within B-rated securities Security selection within the Telecommunications and Utilities sectors Underweight and security selection within Energy sector Security selection within CCC and below rated securities Underweight versus the Index and security selection within the Health Care and Diversified Financial Services sectors |
| Performance Past Does Not Indicate Future [Text] | The investment return and principal value of an investment will fluctuate so that an investor’s shares, when redeemed, may be worth more or less than their original cost. Results represent the Fund's past performance, which is not a good predictor of how the Fund will perform in the future. Current performance may be lower or higher than the performance data quoted. |
| Line Graph [Table Text Block] | Class C (including sales charge) $13,106 Bloomberg U.S. Aggregate Bond Index $11,593 ICE BofA U.S. High Yield Constrained Index $15,939 10/31/14 $10,000 $10,000 $10,000 10/31/15 $9,645 $10,196 $9,797 10/31/16 $10,318 $10,641 $10,795 10/31/17 $10,913 $10,737 $11,781 10/31/18 $10,812 $10,517 $11,883 10/31/19 $11,548 $11,727 $12,872 10/31/20 $11,749 $12,453 $13,187 10/31/21 $12,721 $12,393 $14,604 10/31/22 $11,137 $10,450 $12,932 10/31/23 $11,458 $10,487 $13,683 10/31/24 $13,106 $11,593 $15,939 |
| Average Annual Return [Table Text Block] | Name 1 Year 5 Years 10 Years Class C (at NAV) 14.39% 2.56% 2.74% Class C (including sales charge) 13.39% 2.56% 2.74% Bloomberg U.S. Aggregate Bond Index 10.55% (0.23)% 1.49% ICE BofA U.S. High Yield Constrained Index 16.49% 4.37% 4.77% |
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or on the redemption of Fund shares. |
| Performance Table Market Index Changed [Text Block] | On July 24, 2024, the Fund began comparing its performance to the Bloomberg U.S. Aggregate Bond Index in order to satisfy a change in regulatory requirements. The ICE BofA U.S. High Yield Constrained Index will be maintained as a secondary index as it shows how the Fund’s performance compares to an index with characteristics that are more representative of the Fund's investment strategy than the Bloomberg U.S. Aggregate Bond Index. |
| AssetsNet | $ 628,340,418 |
| Holdings Count | Holding | 604 |
| Advisory Fees Paid, Amount | $ 3,086,786 |
| InvestmentCompanyPortfolioTurnover | 102% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics Net Assets $628,340,418 Number of Portfolio Holdings 604 Portfolio Turnover Rate 102% Total Investment Advisory Fees Paid $3,086,786 |
| Holdings [Text Block] | Top Ten Industry Allocation (as a % of Total Investments Footnote Reference Media 6.2 % Pipelines 5.4 % Commercial Services 5.2 % Chemicals 5.0 % Electric 4.7 % Telecommunications 4.5 % Retail 4.4 % Diversified Financial Services 4.0 % Insurance 3.9 % Healthcare - Services 3.5% Footnote Description Footnote Derivatives (other than options purchased), if any, are excluded from this calculation. |
| Largest Holdings [Text Block] | Top Ten Issuers (as a % of Total Investments Footnote Reference State Street Institutional U.S. Government Money Market Fund Premier Class 2.7% CCO Holdings LLC/CCO Holdings Capital Corp. 2.3% TransDigm, Inc. 1.5% CSC Holdings LLC 1.3% NRG Energy, Inc. 1.0% Medline Borrower LP 0.9% Venture Global LNG, Inc. 0.9% Vistra Operations Co. LLC 0.8% Olympus Water U.S. Holding Corp. 0.8% Alliant Holdings Intermediate LLC/Alliant Holdings Co-Issuer 0.8% Footnote Description Footnote Derivatives (other than options purchased), if any, are excluded from this calculation. |
| Material Fund Change [Text Block] | |
| C000077170 | |
| Shareholder Report [Line Items] | |
| Fund Name | High Income Bond Fund |
| Class Name | Class R3 |
| Trading Symbol | NHIRX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the Fund for the period of November 1, 2023 to October 31, 2024. |
| Shareholder Report Annual or Semi-Annual | Annual Shareholder Report |
| Additional Information [Text Block] | You can find additional information about the Fund at www.nb.com/en/us/products/mutual-funds/high-income-bond-fund?section=documents issdl nb.com |
| Additional Information Phone Number | 800.366.6264 |
| Additional Information Email | issdl@nb.com</span>" id="sjs-B293"><span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left;">issdl@nb.com</span> |
| Additional Information Website | www.nb.com/en/us/products/mutual-funds/high-income-bond-fund?section=documents</span>" id="sjs-B294"><span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left;">www.nb.com/en/us/products/mutual-funds/high-income-bond-fund?section=documents</span> |
| Expenses [Text Block] | What were the Fund's costs for the year? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Class R3 $145 1.35% |
| Expenses Paid, Amount | $ 145 |
| Expense Ratio, Percent | 1.35% |
| Factors Affecting Performance [Text Block] | How did the Fund perform last year? Relative to the ICE BofA U.S. High Yield Constrained Index (the Index), security selection within and an underweight within BB-rated securities contributed. Security selection within the Telecommunications and Utilities sectors, as well as an underweight and security selection within the Energy sector bolstered returns. Performance was negatively impacted by security selection within the CCC and below rated securities. An underweight and security selection in both the Healthcare and Diversified Financial Services sectors also detracted from the Fund's overall results. Performance Attribution Top Contributors Top Detractors Security selection and an underweight versus the Index within BB-rated securities Security selection within B-rated securities Security selection within the Telecommunications and Utilities sectors Underweight and security selection within Energy sector Security selection within CCC and below rated securities Underweight versus the Index and security selection within the Health Care and Diversified Financial Services sectors |
| Performance Past Does Not Indicate Future [Text] | The investment return and principal value of an investment will fluctuate so that an investor’s shares, when redeemed, may be worth more or less than their original cost. Results represent the Fund's past performance, which is not a good predictor of how the Fund will perform in the future. Current performance may be lower or higher than the performance data quoted. |
| Line Graph [Table Text Block] | Class R3 $13,766 Bloomberg U.S. Aggregate Bond Index $11,593 ICE BofA U.S. High Yield Constrained Index $15,939 10/31/14 $10,000 $10,000 $10,000 10/31/15 $9,692 $10,196 $9,797 10/31/16 $10,417 $10,641 $10,795 10/31/17 $11,063 $10,737 $11,781 10/31/18 $11,008 $10,517 $11,883 10/31/19 $11,819 $11,727 $12,872 10/31/20 $12,096 $12,453 $13,187 10/31/21 $13,147 $12,393 $14,604 10/31/22 $11,564 $10,450 $12,932 10/31/23 $11,973 $10,487 $13,683 10/31/24 $13,766 $11,593 $15,939 |
| Average Annual Return [Table Text Block] | Name 1 Year 5 Years 10 Years Class R3 14.97% 3.10% 3.25% Bloomberg U.S. Aggregate Bond Index 10.55% (0.23)% 1.49% ICE BofA U.S. High Yield Constrained Index 16.49% 4.37% 4.77% |
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or on the redemption of Fund shares. |
| Performance Table Market Index Changed [Text Block] | On July 24, 2024, the Fund began comparing its performance to the Bloomberg U.S. Aggregate Bond Index in order to satisfy a change in regulatory requirements. The ICE BofA U.S. High Yield Constrained Index will be maintained as a secondary index as it shows how the Fund’s performance compares to an index with characteristics that are more representative of the Fund's investment strategy than the Bloomberg U.S. Aggregate Bond Index. |
| AssetsNet | $ 628,340,418 |
| Holdings Count | Holding | 604 |
| Advisory Fees Paid, Amount | $ 3,086,786 |
| InvestmentCompanyPortfolioTurnover | 102% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics Net Assets $628,340,418 Number of Portfolio Holdings 604 Portfolio Turnover Rate 102% Total Investment Advisory Fees Paid $3,086,786 |
| Holdings [Text Block] | Top Ten Industry Allocation (as a % of Total Investments Footnote Reference Media 6.2 % Pipelines 5.4 % Commercial Services 5.2 % Chemicals 5.0 % Electric 4.7 % Telecommunications 4.5 % Retail 4.4 % Diversified Financial Services 4.0 % Insurance 3.9 % Healthcare - Services 3.5% Footnote Description Footnote Derivatives (other than options purchased), if any, are excluded from this calculation. |
| Largest Holdings [Text Block] | Top Ten Issuers (as a % of Total Investments Footnote Reference State Street Institutional U.S. Government Money Market Fund Premier Class 2.7% CCO Holdings LLC/CCO Holdings Capital Corp. 2.3% TransDigm, Inc. 1.5% CSC Holdings LLC 1.3% NRG Energy, Inc. 1.0% Medline Borrower LP 0.9% Venture Global LNG, Inc. 0.9% Vistra Operations Co. LLC 0.8% Olympus Water U.S. Holding Corp. 0.8% Alliant Holdings Intermediate LLC/Alliant Holdings Co-Issuer 0.8% Footnote Description Footnote Derivatives (other than options purchased), if any, are excluded from this calculation. |
| Material Fund Change [Text Block] | |
| C000125075 | |
| Shareholder Report [Line Items] | |
| Fund Name | High Income Bond Fund |
| Class Name | Class R6 |
| Trading Symbol | NRHIX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the Fund for the period of November 1, 2023 to October 31, 2024. |
| Shareholder Report Annual or Semi-Annual | Annual Shareholder Report |
| Additional Information [Text Block] | You can find additional information about the Fund at www.nb.com/en/us/products/mutual-funds/high-income-bond-fund?section=documents issdl nb.com |
| Additional Information Phone Number | 800.366.6264 |
| Additional Information Email | issdl@nb.com</span>" id="sjs-B321"><span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left;">issdl@nb.com</span> |
| Additional Information Website | www.nb.com/en/us/products/mutual-funds/high-income-bond-fund?section=documents</span>" id="sjs-B322"><span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left;">www.nb.com/en/us/products/mutual-funds/high-income-bond-fund?section=documents</span> |
| Expenses [Text Block] | What were the Fund's costs for the year? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Class R6 $66 0.61% |
| Expenses Paid, Amount | $ 66 |
| Expense Ratio, Percent | 0.61% |
| Factors Affecting Performance [Text Block] | How did the Fund perform last year? Relative to the ICE BofA U.S. High Yield Constrained Index (the Index), security selection within and an underweight within BB-rated securities contributed. Security selection within the Telecommunications and Utilities sectors, as well as an underweight and security selection within the Energy sector bolstered returns. Performance was negatively impacted by security selection within the CCC and below rated securities. An underweight and security selection in both the Healthcare and Diversified Financial Services sectors also detracted from the Fund's overall results. Performance Attribution Top Contributors Top Detractors Security selection and an underweight versus the Index within BB-rated securities Security selection within B-rated securities Security selection within the Telecommunications and Utilities sectors Underweight and security selection within Energy sector Security selection within CCC and below rated securities Underweight versus the Index and security selection within the Health Care and Diversified Financial Services sectors |
| Performance Past Does Not Indicate Future [Text] | The investment return and principal value of an investment will fluctuate so that an investor’s shares, when redeemed, may be worth more or less than their original cost. Results represent the Fund's past performance, which is not a good predictor of how the Fund will perform in the future. Current performance may be lower or higher than the performance data quoted. |
| Line Graph [Table Text Block] | Class R6 $14,824 Bloomberg U.S. Aggregate Bond Index $11,593 ICE BofA U.S. High Yield Constrained Index $15,939 10/31/14 $10,000 $10,000 $10,000 10/31/15 $9,761 $10,196 $9,797 10/31/16 $10,568 $10,641 $10,795 10/31/17 $11,311 $10,737 $11,781 10/31/18 $11,340 $10,517 $11,883 10/31/19 $12,261 $11,727 $12,872 10/31/20 $12,643 $12,453 $13,187 10/31/21 $13,842 $12,393 $14,604 10/31/22 $12,271 $10,450 $12,932 10/31/23 $12,800 $10,487 $13,683 10/31/24 $14,824 $11,593 $15,939 |
| Average Annual Return [Table Text Block] | Name 1 Year 5 Years 10 Years Class R6 15.81% 3.87% 4.01% Bloomberg U.S. Aggregate Bond Index 10.55% (0.23)% 1.49% ICE BofA U.S. High Yield Constrained Index 16.49% 4.37% 4.77% |
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or on the redemption of Fund shares. |
| Performance Table Market Index Changed [Text Block] | On July 24, 2024, the Fund began comparing its performance to the Bloomberg U.S. Aggregate Bond Index in order to satisfy a change in regulatory requirements. The ICE BofA U.S. High Yield Constrained Index will be maintained as a secondary index as it shows how the Fund’s performance compares to an index with characteristics that are more representative of the Fund's investment strategy than the Bloomberg U.S. Aggregate Bond Index. |
| AssetsNet | $ 628,340,418 |
| Holdings Count | Holding | 604 |
| Advisory Fees Paid, Amount | $ 3,086,786 |
| InvestmentCompanyPortfolioTurnover | 102% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics Net Assets $628,340,418 Number of Portfolio Holdings 604 Portfolio Turnover Rate 102% Total Investment Advisory Fees Paid $3,086,786 |
| Holdings [Text Block] | Top Ten Industry Allocation (as a % of Total Investments Footnote Reference Media 6.2 % Pipelines 5.4 % Commercial Services 5.2 % Chemicals 5.0 % Electric 4.7 % Telecommunications 4.5 % Retail 4.4 % Diversified Financial Services 4.0 % Insurance 3.9 % Healthcare - Services 3.5% Footnote Description Footnote Derivatives (other than options purchased), if any, are excluded from this calculation. |
| Largest Holdings [Text Block] | Top Ten Issuers (as a % of Total Investments Footnote Reference State Street Institutional U.S. Government Money Market Fund Premier Class 2.7% CCO Holdings LLC/CCO Holdings Capital Corp. 2.3% TransDigm, Inc. 1.5% CSC Holdings LLC 1.3% NRG Energy, Inc. 1.0% Medline Borrower LP 0.9% Venture Global LNG, Inc. 0.9% Vistra Operations Co. LLC 0.8% Olympus Water U.S. Holding Corp. 0.8% Alliant Holdings Intermediate LLC/Alliant Holdings Co-Issuer 0.8% Footnote Description Footnote Derivatives (other than options purchased), if any, are excluded from this calculation. |
| Material Fund Change [Text Block] | |
| C000228875 | |
| Shareholder Report [Line Items] | |
| Fund Name | High Income Bond Fund |
| Class Name | Class E |
| Trading Symbol | NHIEX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the Fund for the period of November 1, 2023 to October 31, 2024. |
| Shareholder Report Annual or Semi-Annual | Annual Shareholder Report |
| Additional Information [Text Block] | You can find additional information about the Fund at www.nb.com/en/us/products/mutual-funds/high-income-bond-fund?section=documents fundinfo nb.com |
| Additional Information Phone Number | 800.877.9700 |
| Additional Information Email | fundinfo@nb.com</span>" id="sjs-B349"><span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left;">fundinfo@nb.com</span> |
| Additional Information Website | www.nb.com/en/us/products/mutual-funds/high-income-bond-fund?section=documents</span>" id="sjs-B350"><span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left;">www.nb.com/en/us/products/mutual-funds/high-income-bond-fund?section=documents</span> |
| Expenses [Text Block] | What were the Fund's costs for the year? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Class E $9 0.08% |
| Expenses Paid, Amount | $ 9 |
| Expense Ratio, Percent | 0.08% |
| Factors Affecting Performance [Text Block] | How did the Fund perform last year? Relative to the ICE BofA U.S. High Yield Constrained Index (the Index), security selection within and an underweight within BB-rated securities contributed. Security selection within the Telecommunications and Utilities sectors, as well as an underweight and security selection within the Energy sector bolstered returns. Performance was negatively impacted by security selection within the CCC and below rated securities. An underweight and security selection in both the Healthcare and Diversified Financial Services sectors also detracted from the Fund's overall results. Performance Attribution Top Contributors Top Detractors Security selection and an underweight versus the Index within BB-rated securities Security selection within B-rated securities Security selection within the Telecommunications and Utilities sectors Underweight and security selection within Energy sector Security selection within CCC and below rated securities Underweight versus the Index and security selection within the Health Care and Diversified Financial Services sectors |
| Performance Past Does Not Indicate Future [Text] | The investment return and principal value of an investment will fluctuate so that an investor’s shares, when redeemed, may be worth more or less than their original cost. Results represent the Fund's past performance, which is not a good predictor of how the Fund will perform in the future. Current performance may be lower or higher than the performance data quoted. |
| Line Graph [Table Text Block] | Class E $14,758 Bloomberg U.S. Aggregate Bond Index $11,593 ICE BofA U.S. High Yield Constrained Index $15,939 10/31/14 $10,000 $10,000 $10,000 10/31/15 $9,739 $10,196 $9,797 10/31/16 $10,508 $10,641 $10,795 10/31/17 $11,227 $10,737 $11,781 10/31/18 $11,243 $10,517 $11,883 10/31/19 $12,111 $11,727 $12,872 10/31/20 $12,456 $12,453 $13,187 10/31/21 $13,603 $12,393 $14,604 10/31/22 $12,087 $10,450 $12,932 10/31/23 $12,674 $10,487 $13,683 10/31/24 $14,758 $11,593 $15,939 |
| Average Annual Return [Table Text Block] | Name 1 Year 5 Years 10 Years Class E 16.44% 4.03% 3.97% Bloomberg U.S. Aggregate Bond Index 10.55% (0.23)% 1.49% ICE BofA U.S. High Yield Constrained Index 16.49% 4.37% 4.77% |
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or on the redemption of Fund shares. The performance prior to Class E's inception date of January 11, 2022 is that of the Fund's Investor Class, which had higher expenses than Class E so its performance typically would have been lower than that of Class E. |
| Performance Table Market Index Changed [Text Block] | On July 24, 2024, the Fund began comparing its performance to the Bloomberg U.S. Aggregate Bond Index in order to satisfy a change in regulatory requirements. The ICE BofA U.S. High Yield Constrained Index will be maintained as a secondary index as it shows how the Fund’s performance compares to an index with characteristics that are more representative of the Fund's investment strategy than the Bloomberg U.S. Aggregate Bond Index. |
| AssetsNet | $ 628,340,418 |
| Holdings Count | Holding | 604 |
| Advisory Fees Paid, Amount | $ 3,086,786 |
| InvestmentCompanyPortfolioTurnover | 102% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics Net Assets $628,340,418 Number of Portfolio Holdings 604 Portfolio Turnover Rate 102% Total Investment Advisory Fees Paid $3,086,786 |
| Holdings [Text Block] | Top Ten Industry Allocation (as a % of Total Investments Footnote Reference Media 6.2 % Pipelines 5.4 % Commercial Services 5.2 % Chemicals 5.0 % Electric 4.7 % Telecommunications 4.5 % Retail 4.4 % Diversified Financial Services 4.0 % Insurance 3.9 % Healthcare - Services 3.5% Footnote Description Footnote Derivatives (other than options purchased), if any, are excluded from this calculation. |
| Largest Holdings [Text Block] | Top Ten Issuers (as a % of Total Investments Footnote Reference State Street Institutional U.S. Government Money Market Fund Premier Class 2.7% CCO Holdings LLC/CCO Holdings Capital Corp. 2.3% TransDigm, Inc. 1.5% CSC Holdings LLC 1.3% NRG Energy, Inc. 1.0% Medline Borrower LP 0.9% Venture Global LNG, Inc. 0.9% Vistra Operations Co. LLC 0.8% Olympus Water U.S. Holding Corp. 0.8% Alliant Holdings Intermediate LLC/Alliant Holdings Co-Issuer 0.8% Footnote Description Footnote Derivatives (other than options purchased), if any, are excluded from this calculation. |
| Material Fund Change [Text Block] | |
| C000157073 | |
| Shareholder Report [Line Items] | |
| Fund Name | Municipal High Income Fund |
| Class Name | Institutional Class |
| Trading Symbol | NMHIX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the Fund for the period of November 1, 2023 to October 31, 2024. |
| Shareholder Report Annual or Semi-Annual | Annual Shareholder Report |
| Additional Information [Text Block] | You can find additional information about the Fund at www.nb.com/en/us/products/mutual-funds/municipal-high-income-fund?section=documents issdl nb.com |
| Additional Information Phone Number | 800.366.6264 |
| Additional Information Email | issdl@nb.com</span>" id="sjs-B377"><span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left;">issdl@nb.com</span> |
| Additional Information Website | www.nb.com/en/us/products/mutual-funds/municipal-high-income-fund?section=documents</span>" id="sjs-B378"><span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left;">www.nb.com/en/us/products/mutual-funds/municipal-high-income-fund?section=documents</span> |
| Expenses [Text Block] | What were the Fund's costs for the year? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Institutional Class $54 0.50% |
| Expenses Paid, Amount | $ 54 |
| Expense Ratio, Percent | 0.50% |
| Factors Affecting Performance [Text Block] | How did the Fund perform last year? The Fund having a long duration was beneficial as interest rates declined over the period. The Fund's emphasis on higher-yielding securities was also beneficial for returns. An overweight versus the 65% Bloomberg Municipal Bond Index and 35% Bloomberg High Yield Index (the Index) to BBB-rated securities was rewarded as these securities outperformed their high-quality counterparts. Security selection in several lower-quality project-specific finance securities negatively impacted returns. Holdings in Puerto Rico and the charter school sector detracted from performance. Performance Attribution Top Contributors Top Detractors Duration positioning versus the Index Overweight to BBB-rated bonds versus the Index Lower-quality project-specific finance securities Holdings in Puerto Rico and the charter school sector |
| Performance Past Does Not Indicate Future [Text] | The investment return and principal value of an investment will fluctuate so that an investor’s shares, when redeemed, may be worth more or less than their original cost. Results represent the Fund's past performance, which is not a good predictor of how the Fund will perform in the future. Current performance may be lower or higher than the performance data quoted. |
| Line Graph [Table Text Block] | Institutional Class $1,309,300 Bloomberg Municipal Bond Index $1,245,700 65% Bloomberg Municipal Bond Index and 35% Bloomberg Municipal High Yield Index $1,330,500 6/22/15 $1,000,000 $1,000,000 $1,000,000 10/31/15 $1,022,700 $1,021,200 $1,014,100 10/31/16 $1,091,300 $1,062,600 $1,071,300 10/31/17 $1,115,700 $1,085,900 $1,097,900 10/31/18 $1,133,700 $1,080,400 $1,112,200 10/31/19 $1,242,800 $1,182,100 $1,225,600 10/31/20 $1,248,600 $1,224,600 $1,260,600 10/31/21 $1,346,400 $1,256,900 $1,328,500 10/31/22 $1,120,200 $1,106,300 $1,148,400 10/31/23 $1,129,600 $1,135,600 $1,184,100 10/31/24 $1,309,300 $1,245,700 $1,330,500 |
| Average Annual Return [Table Text Block] | Name 1 Year 5 Years Since Inception 6/22/15 Institutional Class 15.90% 1.05% 2.92% Bloomberg Municipal Bond Index 9.70% 1.05% 2.37% 65% Bloomberg Municipal Bond Index and 35% Bloomberg Municipal High Yield Index 12.37% 1.66% 3.09% |
| Performance Inception Date | Jun. 22, 2015 |
| Performance Table Market Index Changed [Text Block] | On July 24, 2024, the Fund began comparing its performance to the Bloomberg Municipal Bond Index in order to satisfy a change in regulatory requirements. A blended benchmark, which is composed of 65% Bloomberg Municipal Bond Index and 35% Bloomberg Municipal High Yield Index, will be maintained as a secondary index as it shows how the Fund’s performance compares to an index with characteristics that are more representative of the Fund’s investment strategy than the Bloomberg Municipal Bond Index. |
| AssetsNet | $ 64,161,876 |
| Holdings Count | Holding | 138 |
| Advisory Fees Paid, Amount | $ 0 |
| InvestmentCompanyPortfolioTurnover | 116% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics Net Assets $64,161,876 Number of Portfolio Holdings 138 Portfolio Turnover Rate 116% Total Investment Advisory Fees Paid $0 |
| Holdings [Text Block] | Asset Allocation (as a % of Total Investments Footnote Reference Value Value Revenue Bonds 88.6% General Obligations 5.4% Tax Allocation 3.1% Special Assessment 2.8% Special Tax 0.1% Footnote Description Footnote Derivatives (other than options purchased), if any, are excluded from this calculation. |
| Largest Holdings [Text Block] | Top Ten States (as a % of Total Investments Footnote Reference New York 9.8% California 8.9% Texas 8.0% Florida 7.1% Colorado 5.6% South Carolina 4.9% Ohio 4.6% Wisconsin 4.1% Alabama 4.0% West Virginia 3.4% Footnote Description Footnote Derivatives (other than options purchased), if any, are excluded from this calculation. |
| Material Fund Change [Text Block] | |
| C000157071 | |
| Shareholder Report [Line Items] | |
| Fund Name | Municipal High Income Fund |
| Class Name | Class A |
| Trading Symbol | NMHAX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the Fund for the period of November 1, 2023 to October 31, 2024. |
| Shareholder Report Annual or Semi-Annual | Annual Shareholder Report |
| Additional Information [Text Block] | You can find additional information about the Fund at www.nb.com/en/us/products/mutual-funds/municipal-high-income-fund?section=documents fundinfo nb.com |
| Additional Information Phone Number | 800.877.9700 |
| Additional Information Email | fundinfo@nb.com</span>" id="sjs-B405"><span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left;">fundinfo@nb.com</span> |
| Additional Information Website | www.nb.com/en/us/products/mutual-funds/municipal-high-income-fund?section=documents</span>" id="sjs-B406"><span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left;">www.nb.com/en/us/products/mutual-funds/municipal-high-income-fund?section=documents</span> |
| Expenses [Text Block] | What were the Fund's costs for the year? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Class A $94 0.87% |
| Expenses Paid, Amount | $ 94 |
| Expense Ratio, Percent | 0.87% |
| Factors Affecting Performance [Text Block] | How did the Fund perform last year? The Fund having a long duration was beneficial as interest rates declined over the period. The Fund's emphasis on higher-yielding securities was also beneficial for returns. An overweight versus the 65% Bloomberg Municipal Bond Index and 35% Bloomberg High Yield Index (the Index) to BBB-rated securities was rewarded as these securities outperformed their high-quality counterparts. Security selection in several lower-quality project-specific finance securities negatively impacted returns. Holdings in Puerto Rico and the charter school sector detracted from performance. Performance Attribution Top Contributors Top Detractors Duration positioning versus the Index Overweight to BBB-rated bonds versus the Index Lower-quality project-specific finance securities Holdings in Puerto Rico and the charter school sector |
| Performance Past Does Not Indicate Future [Text] | The investment return and principal value of an investment will fluctuate so that an investor’s shares, when redeemed, may be worth more or less than their original cost. Results represent the Fund's past performance, which is not a good predictor of how the Fund will perform in the future. Current performance may be lower or higher than the performance data quoted. |
| Line Graph [Table Text Block] | Class A (including sales charge) $12,104 Bloomberg Municipal Bond Index $12,457 65% Bloomberg Municipal Bond Index and 35% Bloomberg Municipal High Yield Index $13,305 6/22/15 $9,575 $10,000 $10,000 10/31/15 $9,793 $10,212 $10,141 10/31/16 $10,401 $10,626 $10,713 10/31/17 $10,595 $10,859 $10,979 10/31/18 $10,726 $10,804 $11,122 10/31/19 $11,706 $11,821 $12,256 10/31/20 $11,716 $12,246 $12,606 10/31/21 $12,588 $12,569 $13,285 10/31/22 $10,444 $11,063 $11,484 10/31/23 $10,493 $11,356 $11,841 10/31/24 $12,104 $12,457 $13,305 |
| Average Annual Return [Table Text Block] | Name 1 Year 5 Years Since Inception 6/22/15 Class A (at NAV) 15.36% 0.67% 2.53% Class A (including sales charge) 10.41% (0.20)% 2.06% Bloomberg Municipal Bond Index 9.70% 1.05% 2.37% 65% Bloomberg Municipal Bond Index and 35% Bloomberg Municipal High Yield Index 12.37% 1.66% 3.09% |
| Performance Inception Date | Jun. 22, 2015 |
| Performance Table Market Index Changed [Text Block] | On July 24, 2024, the Fund began comparing its performance to the Bloomberg Municipal Bond Index in order to satisfy a change in regulatory requirements. A blended benchmark, which is composed of 65% Bloomberg Municipal Bond Index and 35% Bloomberg Municipal High Yield Index, will be maintained as a secondary index as it shows how the Fund’s performance compares to an index with characteristics that are more representative of the Fund’s investment strategy than the Bloomberg Municipal Bond Index. |
| AssetsNet | $ 64,161,876 |
| Holdings Count | Holding | 138 |
| Advisory Fees Paid, Amount | $ 0 |
| InvestmentCompanyPortfolioTurnover | 116% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics Net Assets $64,161,876 Number of Portfolio Holdings 138 Portfolio Turnover Rate 116% Total Investment Advisory Fees Paid $0 |
| Holdings [Text Block] | Asset Allocation (as a % of Total Investments Footnote Reference Value Value Revenue Bonds 88.6% General Obligations 5.4% Tax Allocation 3.1% Special Assessment 2.8% Special Tax 0.1% Footnote Description Footnote Derivatives (other than options purchased), if any, are excluded from this calculation. |
| Largest Holdings [Text Block] | Top Ten States (as a % of Total Investments Footnote Reference New York 9.8% California 8.9% Texas 8.0% Florida 7.1% Colorado 5.6% South Carolina 4.9% Ohio 4.6% Wisconsin 4.1% Alabama 4.0% West Virginia 3.4% Footnote Description Footnote Derivatives (other than options purchased), if any, are excluded from this calculation. |
| Material Fund Change [Text Block] | |
| C000157072 | |
| Shareholder Report [Line Items] | |
| Fund Name | Municipal High Income Fund |
| Class Name | Class C |
| Trading Symbol | NMHCX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the Fund for the period of November 1, 2023 to October 31, 2024. |
| Shareholder Report Annual or Semi-Annual | Annual Shareholder Report |
| Additional Information [Text Block] | You can find additional information about the Fund at www.nb.com/en/us/products/mutual-funds/municipal-high-income-fund?section=documents fundinfo nb.com |
| Additional Information Phone Number | 800.877.9700 |
| Additional Information Email | fundinfo@nb.com</span>" id="sjs-B433"><span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left;">fundinfo@nb.com</span> |
| Additional Information Website | www.nb.com/en/us/products/mutual-funds/municipal-high-income-fund?section=documents</span>" id="sjs-B434"><span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left;">www.nb.com/en/us/products/mutual-funds/municipal-high-income-fund?section=documents</span> |
| Expenses [Text Block] | What were the Fund's costs for the year? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Class C $174 1.62% |
| Expenses Paid, Amount | $ 174 |
| Expense Ratio, Percent | 1.62% |
| Factors Affecting Performance [Text Block] | How did the Fund perform last year? The Fund having a long duration was beneficial as interest rates declined over the period. The Fund's emphasis on higher-yielding securities was also beneficial for returns. An overweight versus the 65% Bloomberg Municipal Bond Index and 35% Bloomberg High Yield Index (the Index) to BBB-rated securities was rewarded as these securities outperformed their high-quality counterparts. Security selection in several lower-quality project-specific finance securities negatively impacted returns. Holdings in Puerto Rico and the charter school sector detracted from performance. Performance Attribution Top Contributors Top Detractors Duration positioning versus the Index Overweight to BBB-rated bonds versus the Index Lower-quality project-specific finance securities Holdings in Puerto Rico and the charter school sector |
| Performance Past Does Not Indicate Future [Text] | The investment return and principal value of an investment will fluctuate so that an investor’s shares, when redeemed, may be worth more or less than their original cost. Results represent the Fund's past performance, which is not a good predictor of how the Fund will perform in the future. Current performance may be lower or higher than the performance data quoted. |
| Line Graph [Table Text Block] | Class C (including sales charge) $11,804 Bloomberg Municipal Bond Index $12,457 65% Bloomberg Municipal Bond Index and 35% Bloomberg Municipal High Yield Index $13,305 6/22/15 $10,000 $10,000 $10,000 10/31/15 $10,187 $10,212 $10,141 10/31/16 $10,749 $10,626 $10,713 10/31/17 $10,879 $10,859 $10,979 10/31/18 $10,921 $10,804 $11,122 10/31/19 $11,839 $11,821 $12,256 10/31/20 $11,772 $12,246 $12,606 10/31/21 $12,553 $12,569 $13,285 10/31/22 $10,329 $11,063 $11,484 10/31/23 $10,300 $11,356 $11,841 10/31/24 $11,804 $12,457 $13,305 |
| Average Annual Return [Table Text Block] | Name 1 Year 5 Years Since Inception 6/22/15 Class C (at NAV) 14.61% (0.06)% 1.79% Class C (including sales charge) 13.61% (0.06)% 1.79% Bloomberg Municipal Bond Index 9.70% 1.05% 2.37% 65% Bloomberg Municipal Bond Index and 35% Bloomberg Municipal High Yield Index 12.37% 1.66% 3.09% |
| Performance Inception Date | Jun. 22, 2015 |
| Performance Table Market Index Changed [Text Block] | On July 24, 2024, the Fund began comparing its performance to the Bloomberg Municipal Bond Index in order to satisfy a change in regulatory requirements. A blended benchmark, which is composed of 65% Bloomberg Municipal Bond Index and 35% Bloomberg Municipal High Yield Index, will be maintained as a secondary index as it shows how the Fund’s performance compares to an index with characteristics that are more representative of the Fund’s investment strategy than the Bloomberg Municipal Bond Index. |
| AssetsNet | $ 64,161,876 |
| Holdings Count | Holding | 138 |
| Advisory Fees Paid, Amount | $ 0 |
| InvestmentCompanyPortfolioTurnover | 116% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics Net Assets $64,161,876 Number of Portfolio Holdings 138 Portfolio Turnover Rate 116% Total Investment Advisory Fees Paid $0 |
| Holdings [Text Block] | Asset Allocation (as a % of Total Investments Footnote Reference Value Value Revenue Bonds 88.6% General Obligations 5.4% Tax Allocation 3.1% Special Assessment 2.8% Special Tax 0.1% Footnote Description Footnote Derivatives (other than options purchased), if any, are excluded from this calculation. |
| Largest Holdings [Text Block] | Top Ten States (as a % of Total Investments Footnote Reference New York 9.8% California 8.9% Texas 8.0% Florida 7.1% Colorado 5.6% South Carolina 4.9% Ohio 4.6% Wisconsin 4.1% Alabama 4.0% West Virginia 3.4% Footnote Description Footnote Derivatives (other than options purchased), if any, are excluded from this calculation. |
| Material Fund Change [Text Block] | |
| C000121799 | |
| Shareholder Report [Line Items] | |
| Fund Name | Municipal Impact Fund |
| Class Name | Institutional Class |
| Trading Symbol | NMIIX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the Fund for the period of November 1, 2023 to October 31, 2024. |
| Shareholder Report Annual or Semi-Annual | Annual Shareholder Report |
| Additional Information [Text Block] | You can find additional information about the Fund at www.nb.com/en/us/products/mutual-funds/municipal-impact-fund?section=documents issdl nb.com |
| Additional Information Phone Number | 800.366.6264 |
| Additional Information Email | issdl@nb.com</span>" id="sjs-B461"><span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left;">issdl@nb.com</span> |
| Additional Information Website | www.nb.com/en/us/products/mutual-funds/municipal-impact-fund?section=documents</span>" id="sjs-B462"><span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left;">www.nb.com/en/us/products/mutual-funds/municipal-impact-fund?section=documents</span> |
| Expenses [Text Block] | What were the Fund's costs for the year? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Institutional Class $45 0.43% |
| Expenses Paid, Amount | $ 45 |
| Expense Ratio, Percent | 0.43% |
| Factors Affecting Performance [Text Block] | How did the Fund perform last year? Having a shorter duration than the Bloomberg Municipal Bond Index (the Index) detracted from the Fund’s performance as interest rates declined over the period. In terms of security selection, several lower-quality project-specific finance securities negatively impacted returns. Conversely, the Fund’s higher-yielding securities were advantageous for results. Security selection in the charter school, sewer and housing sectors was beneficial. Security selection of BBB-rated bonds was also additive for performance. In making such security selections, the Fund focused on sustainable issuers with what we viewed as having best-in-class operations, with managements that make sound financial decisions. Performance Attribution Top Contributors Top Detractors Security selection in the charter school, sewer and housing sectors Security selection of BBB-rated bonds Duration positioning versus the Index Lower-quality project-specific finance securities |
| Performance Past Does Not Indicate Future [Text] | The investment return and principal value of an investment will fluctuate so that an investor’s shares, when redeemed, may be worth more or less than their original cost. Results represent the Fund's past performance, which is not a good predictor of how the Fund will perform in the future. Current performance may be lower or higher than the performance data quoted. |
| Line Graph [Table Text Block] | Institutional Class $1,166,700 Bloomberg Municipal Bond Index $1,254,800 10/31/14 $1,000,000 $1,000,000 10/31/15 $1,019,900 $1,028,700 10/31/16 $1,054,300 $1,070,400 10/31/17 $1,063,200 $1,093,900 10/31/18 $1,046,100 $1,088,300 10/31/19 $1,139,500 $1,190,800 10/31/20 $1,176,900 $1,233,600 10/31/21 $1,195,700 $1,266,100 10/31/22 $1,065,600 $1,114,400 10/31/23 $1,077,500 $1,143,900 10/31/24 $1,166,700 $1,254,800 |
| Average Annual Return [Table Text Block] | Name 1 Year 5 Years 10 Years Institutional Class 8.27% 0.47% 1.55% Bloomberg Municipal Bond Index 9.70% 1.05% 2.30% |
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or on the redemption of Fund shares. |
| AssetsNet | $ 74,393,565 |
| Holdings Count | Holding | 113 |
| Advisory Fees Paid, Amount | $ 0 |
| InvestmentCompanyPortfolioTurnover | 69% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics Net Assets $74,393,565 Number of Portfolio Holdings 113 Portfolio Turnover Rate 69% Total Investment Advisory Fees Paid $0 |
| Holdings [Text Block] | Asset Allocation (as a % of Total Investments Footnote Reference Value Value Revenue Bonds 71.7% General Obligations 24.6% Certificate Participation 2.3% Pre-Refunded 1.4% Footnote Description Footnote Derivatives (other than options purchased), if any, are excluded from this calculation. |
| Largest Holdings [Text Block] | Top Ten States (as a % of Total Investments Footnote Reference Michigan 11.4% New York 11.0% Texas 9.2% Illinois 7.1% Kentucky 6.8% West Virginia 6.0% Indiana 4.7% Florida 4.2% Oklahoma 4.0% South Carolina 3.7% Footnote Description Footnote Derivatives (other than options purchased), if any, are excluded from this calculation. |
| Material Fund Change [Text Block] | |
| C000201844 | |
| Shareholder Report [Line Items] | |
| Fund Name | Municipal Impact Fund |
| Class Name | Class A |
| Trading Symbol | NIMAX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the Fund for the period of November 1, 2023 to October 31, 2024. |
| Shareholder Report Annual or Semi-Annual | Annual Shareholder Report |
| Additional Information [Text Block] | You can find additional information about the Fund at www.nb.com/en/us/products/mutual-funds/municipal-impact-fund?section=documents fundinfo nb.com |
| Additional Information Phone Number | 800.877.9700 |
| Additional Information Email | fundinfo@nb.com</span>" id="sjs-B488"><span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left;">fundinfo@nb.com</span> |
| Additional Information Website | www.nb.com/en/us/products/mutual-funds/municipal-impact-fund?section=documents</span>" id="sjs-B489"><span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left;">www.nb.com/en/us/products/mutual-funds/municipal-impact-fund?section=documents</span> |
| Expenses [Text Block] | What were the Fund's costs for the year? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Class A $83 0.80% |
| Expenses Paid, Amount | $ 83 |
| Expense Ratio, Percent | 0.80% |
| Factors Affecting Performance [Text Block] | How did the Fund perform last year? Having a shorter duration than the Bloomberg Municipal Bond Index (the Index) detracted from the Fund’s performance as interest rates declined over the period. In terms of security selection, several lower-quality project-specific finance securities negatively impacted returns. Conversely, the Fund’s higher-yielding securities were advantageous for results. Security selection in the charter school, sewer and housing sectors was beneficial. Security selection of BBB-rated bonds was also additive for performance. In making such security selections, the Fund focused on sustainable issuers with what we viewed as having best-in-class operations, with managements that make sound financial decisions. Performance Attribution Top Contributors Top Detractors Security selection in the charter school, sewer and housing sectors Security selection of BBB-rated bonds Duration positioning versus the Index Lower-quality project-specific finance securities |
| Performance Past Does Not Indicate Future [Text] | The investment return and principal value of an investment will fluctuate so that an investor’s shares, when redeemed, may be worth more or less than their original cost. Results represent the Fund's past performance, which is not a good predictor of how the Fund will perform in the future. Current performance may be lower or higher than the performance data quoted. |
| Line Graph [Table Text Block] | Class A (including sales charge) $10,909 Bloomberg Municipal Bond Index $12,548 10/31/14 $9,575 $10,000 10/31/15 $9,766 $10,287 10/31/16 $10,095 $10,704 10/31/17 $10,180 $10,939 10/31/18 $10,003 $10,883 10/31/19 $10,860 $11,908 10/31/20 $11,175 $12,336 10/31/21 $11,311 $12,661 10/31/22 $10,038 $11,144 10/31/23 $10,119 $11,439 10/31/24 $10,909 $12,548 |
| Average Annual Return [Table Text Block] | Name 1 Year 5 Years 10 Years Class A (at NAV) 7.80% 0.09% 1.31% Class A (including sales charge) 3.23% (0.77)% 0.87% Bloomberg Municipal Bond Index 9.70% 1.05% 2.30% |
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or on the redemption of Fund shares. The performance prior to Class A's inception date of June 19, 2018, is that of the Fund's Institutional Class, which had lower expenses than Class A so its performance typically would have been higher than that of Class A. |
| AssetsNet | $ 74,393,565 |
| Holdings Count | Holding | 113 |
| Advisory Fees Paid, Amount | $ 0 |
| InvestmentCompanyPortfolioTurnover | 69% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics Net Assets $74,393,565 Number of Portfolio Holdings 113 Portfolio Turnover Rate 69% Total Investment Advisory Fees Paid $0 |
| Holdings [Text Block] | Asset Allocation (as a % of Total Investments Footnote Reference Value Value Revenue Bonds 71.7% General Obligations 24.6% Certificate Participation 2.3% Pre-Refunded 1.4% Footnote Description Footnote Derivatives (other than options purchased), if any, are excluded from this calculation. |
| Largest Holdings [Text Block] | Top Ten States (as a % of Total Investments Footnote Reference Michigan 11.4% New York 11.0% Texas 9.2% Illinois 7.1% Kentucky 6.8% West Virginia 6.0% Indiana 4.7% Florida 4.2% Oklahoma 4.0% South Carolina 3.7% Footnote Description Footnote Derivatives (other than options purchased), if any, are excluded from this calculation. |
| Material Fund Change [Text Block] | |
| C000201845 | |
| Shareholder Report [Line Items] | |
| Fund Name | Municipal Impact Fund |
| Class Name | Class C |
| Trading Symbol | NIMCX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the Fund for the period of November 1, 2023 to October 31, 2024. |
| Shareholder Report Annual or Semi-Annual | Annual Shareholder Report |
| Additional Information [Text Block] | You can find additional information about the Fund at www.nb.com/en/us/products/mutual-funds/municipal-impact-fund?section=documents fundinfo nb.com |
| Additional Information Phone Number | 800.877.9700 |
| Additional Information Email | fundinfo@nb.com</span>" id="sjs-B515"><span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left;">fundinfo@nb.com</span> |
| Additional Information Website | www.nb.com/en/us/products/mutual-funds/municipal-impact-fund?section=documents</span>" id="sjs-B516"><span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left;">www.nb.com/en/us/products/mutual-funds/municipal-impact-fund?section=documents</span> |
| Expenses [Text Block] | What were the Fund's costs for the year? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Class C $160 1.55% |
| Expenses Paid, Amount | $ 160 |
| Expense Ratio, Percent | 1.55% |
| Factors Affecting Performance [Text Block] | How did the Fund perform last year? Having a shorter duration than the Bloomberg Municipal Bond Index (the Index) detracted from the Fund’s performance as interest rates declined over the period. In terms of security selection, several lower-quality project-specific finance securities negatively impacted returns. Conversely, the Fund’s higher-yielding securities were advantageous for results. Security selection in the charter school, sewer and housing sectors was beneficial. Security selection of BBB-rated bonds was also additive for performance. In making such security selections, the Fund focused on sustainable issuers with what we viewed as having best-in-class operations, with managements that make sound financial decisions. Performance Attribution Top Contributors Top Detractors Security selection in the charter school, sewer and housing sectors Security selection of BBB-rated bonds Duration positioning versus the Index Lower-quality project-specific finance securities |
| Performance Past Does Not Indicate Future [Text] | The investment return and principal value of an investment will fluctuate so that an investor’s shares, when redeemed, may be worth more or less than their original cost. Results represent the Fund's past performance, which is not a good predictor of how the Fund will perform in the future. Current performance may be lower or higher than the performance data quoted. |
| Line Graph [Table Text Block] | Class C (including sales charge) $10,860 Bloomberg Municipal Bond Index $12,548 10/31/14 $10,000 $10,000 10/31/15 $10,199 $10,287 10/31/16 $10,543 $10,704 10/31/17 $10,632 $10,939 10/31/18 $10,417 $10,883 10/31/19 $11,224 $11,908 10/31/20 $11,464 $12,336 10/31/21 $11,517 $12,661 10/31/22 $10,144 $11,144 10/31/23 $10,149 $11,439 10/31/24 $10,860 $12,548 |
| Average Annual Return [Table Text Block] | Name 1 Year 5 Years 10 Years Class C (at NAV) 7.00% (0.66)% 0.83% Class C (including sales charge) 6.00% (0.66)% 0.83% Bloomberg Municipal Bond Index 9.70% 1.05% 2.30% |
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or on the redemption of Fund shares. The performance prior to Class C's inception date of June 19, 2018, is that of the Fund's Institutional Class, which had lower expenses than Class C so its performance typically would have been higher than that of Class C. |
| AssetsNet | $ 74,393,565 |
| Holdings Count | Holding | 113 |
| Advisory Fees Paid, Amount | $ 0 |
| InvestmentCompanyPortfolioTurnover | 69% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics Net Assets $74,393,565 Number of Portfolio Holdings 113 Portfolio Turnover Rate 69% Total Investment Advisory Fees Paid $0 |
| Holdings [Text Block] | Asset Allocation (as a % of Total Investments Footnote Reference Value Value Revenue Bonds 71.7% General Obligations 24.6% Certificate Participation 2.3% Pre-Refunded 1.4% Footnote Description Footnote Derivatives (other than options purchased), if any, are excluded from this calculation. |
| Largest Holdings [Text Block] | Top Ten States (as a % of Total Investments Footnote Reference Michigan 11.4% New York 11.0% Texas 9.2% Illinois 7.1% Kentucky 6.8% West Virginia 6.0% Indiana 4.7% Florida 4.2% Oklahoma 4.0% South Carolina 3.7% Footnote Description Footnote Derivatives (other than options purchased), if any, are excluded from this calculation. |
| Material Fund Change [Text Block] | |
| C000021323 | |
| Shareholder Report [Line Items] | |
| Fund Name | Municipal Intermediate Bond Fund |
| Class Name | Investor Class |
| Trading Symbol | NMUIX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the Fund for the period of November 1, 2023 to October 31, 2024. |
| Shareholder Report Annual or Semi-Annual | Annual Shareholder Report |
| Additional Information [Text Block] | You can find additional information about the Fund at www.nb.com/en/us/products/mutual-funds/municipal-intermediate-bond-fund?section=documents fundinfo nb.com |
| Additional Information Phone Number | 800.877.9700 |
| Additional Information Email | fundinfo@nb.com</span>" id="sjs-B542"><span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left;">fundinfo@nb.com</span> |
| Additional Information Website | www.nb.com/en/us/products/mutual-funds/municipal-intermediate-bond-fund?section=documents</span>" id="sjs-B543"><span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left;">www.nb.com/en/us/products/mutual-funds/municipal-intermediate-bond-fund?section=documents</span> |
| Expenses [Text Block] | What were the Fund's costs for the year? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Investor Class $47 0.45% |
| Expenses Paid, Amount | $ 47 |
| Expense Ratio, Percent | 0.45% |
| Factors Affecting Performance [Text Block] | How did the Fund perform last year? The Fund’s long duration was beneficial as interest rates declined over the period. An emphasis on higher-yielding securities was also beneficial, as was security selection in the continuing care and charter school sectors. In contrast, high-quality pre-refunded securities and lower-coupon housing bonds were drags on performance. Relative to the Bloomberg 7-Year General Obligation (G.O.) Index (the Index), an overweight to A-rated securities and security selection of BBB-rated bonds were additive for results. Performance Attribution Top Contributors Top Detractors Duration positioning versus the Index Security selection in the continuing care and charter school sectors Overweight versus the Index to A-rated securities and security selection of BBB-rated bonds Pre-refunded securities Lower-coupon housing bonds |
| Performance Past Does Not Indicate Future [Text] | The investment return and principal value of an investment will fluctuate so that an investor’s shares, when redeemed, may be worth more or less than their original cost. Results represent the Fund's past performance, which is not a good predictor of how the Fund will perform in the future. Current performance may be lower or higher than the performance data quoted. |
| Line Graph [Table Text Block] | Investor Class $11,705 Bloomberg Municipal Bond Index $12,548 Bloomberg 7-Year G.O. Index $12,068 10/31/14 $10,000 $10,000 $10,000 10/31/15 $10,182 $10,287 $10,263 10/31/16 $10,496 $10,704 $10,575 10/31/17 $10,630 $10,939 $10,734 10/31/18 $10,513 $10,883 $10,620 10/31/19 $11,403 $11,908 $11,537 10/31/20 $11,633 $12,336 $12,052 10/31/21 $11,966 $12,661 $12,180 10/31/22 $10,571 $11,144 $11,128 10/31/23 $10,813 $11,439 $11,336 10/31/24 $11,705 $12,548 $12,068 |
| Average Annual Return [Table Text Block] | Name 1 Year 5 Years 10 Years Investor Class 8.25% 0.52% 1.59% Bloomberg Municipal Bond Index 9.70% 1.05% 2.30% Bloomberg 7-Year G.O. Index 6.46% 0.90% 1.90% |
| Performance Table Market Index Changed [Text Block] | On July 24, 2024, the Fund began comparing its performance to the Bloomberg Municipal Bond Index in order to satisfy a change in regulatory requirements. The Bloomberg 7-Year G.O. Index will be maintained as a secondary index as it shows how the Fund’s performance compares to an index with characteristics that are more representative of the Fund's investment strategy than the Bloomberg Municipal Bond Index. |
| AssetsNet | $ 191,036,227 |
| Holdings Count | Holding | 210 |
| Advisory Fees Paid, Amount | $ 0 |
| InvestmentCompanyPortfolioTurnover | 89% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics Net Assets $191,036,227 Number of Portfolio Holdings 210 Portfolio Turnover Rate 89% Total Investment Advisory Fees Paid $0 |
| Holdings [Text Block] | Asset Allocation (as a % of Total Investments Footnote Reference Value Value Revenue Bonds 74.1% General Obligations 22.2% Tax Allocation 1.5% Special Assessment 1.2% Certificate Participation 0.5% Pre-Refunded 0.3% Special Tax 0.2% Footnote Description Footnote Derivatives (other than options purchased), if any, are excluded from this calculation. |
| Largest Holdings [Text Block] | Top Ten States (as a % of Total Investments Footnote Reference New York 17.5% Illinois 15.2% Texas 7.7% Pennsylvania 7.6% California 5.4% Georgia 4.8% New Jersey 3.6% Florida 2.9% Utah 2.2% Indiana 2.1% Footnote Description Footnote Derivatives (other than options purchased), if any, are excluded from this calculation. |
| Material Fund Change [Text Block] | |
| C000089979 | |
| Shareholder Report [Line Items] | |
| Fund Name | Municipal Intermediate Bond Fund |
| Class Name | Institutional Class |
| Trading Symbol | NMNLX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the Fund for the period of November 1, 2023 to October 31, 2024. |
| Shareholder Report Annual or Semi-Annual | Annual Shareholder Report |
| Additional Information [Text Block] | You can find additional information about the Fund at www.nb.com/en/us/products/mutual-funds/municipal-intermediate-bond-fund?section=documents issdl nb.com |
| Additional Information Phone Number | 800.366.6264 |
| Additional Information Email | issdl@nb.com</span>" id="sjs-B569"><span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left;">issdl@nb.com</span> |
| Additional Information Website | www.nb.com/en/us/products/mutual-funds/municipal-intermediate-bond-fund?section=documents</span>" id="sjs-B570"><span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left;">www.nb.com/en/us/products/mutual-funds/municipal-intermediate-bond-fund?section=documents</span> |
| Expenses [Text Block] | What were the Fund's costs for the year? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Institutional Class $31 0.30% |
| Expenses Paid, Amount | $ 31 |
| Expense Ratio, Percent | 0.30% |
| Factors Affecting Performance [Text Block] | How did the Fund perform last year? The Fund’s long duration was beneficial as interest rates declined over the period. An emphasis on higher-yielding securities was also beneficial, as was security selection in the continuing care and charter school sectors. In contrast, high-quality pre-refunded securities and lower-coupon housing bonds were drags on performance. Relative to the Bloomberg 7-Year General Obligation (G.O.) Index (the Index), an overweight to A-rated securities and security selection of BBB-rated bonds were additive for results. Performance Attribution Top Contributors Top Detractors Duration positioning versus the Index Security selection in the continuing care and charter school sectors Overweight versus the Index to A-rated securities and security selection of BBB-rated bonds Pre-refunded securities Lower-coupon housing bonds |
| Performance Past Does Not Indicate Future [Text] | The investment return and principal value of an investment will fluctuate so that an investor’s shares, when redeemed, may be worth more or less than their original cost. Results represent the Fund's past performance, which is not a good predictor of how the Fund will perform in the future. Current performance may be lower or higher than the performance data quoted. |
| Line Graph [Table Text Block] | Institutional Class $1,188,100 Bloomberg Municipal Bond Index $1,254,800 Bloomberg 7-Year G.O. Index $1,206,800 10/31/14 $1,000,000 $1,000,000 $1,000,000 10/31/15 $1,019,700 $1,028,700 $1,026,300 10/31/16 $1,052,800 $1,070,400 $1,057,500 10/31/17 $1,067,800 $1,093,900 $1,073,400 10/31/18 $1,057,600 $1,088,300 $1,062,000 10/31/19 $1,148,900 $1,190,800 $1,153,700 10/31/20 $1,173,800 $1,233,600 $1,205,200 10/31/21 $1,209,300 $1,266,100 $1,218,000 10/31/22 $1,069,700 $1,114,400 $1,112,800 10/31/23 $1,095,800 $1,143,900 $1,133,600 10/31/24 $1,188,100 $1,254,800 $1,206,800 |
| Average Annual Return [Table Text Block] | Name 1 Year 5 Years 10 Years Institutional Class 8.42% 0.67% 1.74% Bloomberg Municipal Bond Index 9.70% 1.05% 2.30% Bloomberg 7-Year G.O. Index 6.46% 0.90% 1.90% |
| Performance Table Market Index Changed [Text Block] | On July 24, 2024, the Fund began comparing its performance to the Bloomberg Municipal Bond Index in order to satisfy a change in regulatory requirements. The Bloomberg 7-Year G.O. Index will be maintained as a secondary index as it shows how the Fund’s performance compares to an index with characteristics that are more representative of the Fund's investment strategy than the Bloomberg Municipal Bond Index. |
| AssetsNet | $ 191,036,227 |
| Holdings Count | Holding | 210 |
| Advisory Fees Paid, Amount | $ 0 |
| InvestmentCompanyPortfolioTurnover | 89% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics Net Assets $191,036,227 Number of Portfolio Holdings 210 Portfolio Turnover Rate 89% Total Investment Advisory Fees Paid $0 |
| Holdings [Text Block] | Asset Allocation (as a % of Total Investments Footnote Reference Value Value Revenue Bonds 74.1% General Obligations 22.2% Tax Allocation 1.5% Special Assessment 1.2% Certificate Participation 0.5% Pre-Refunded 0.3% Special Tax 0.2% Footnote Description Footnote Derivatives (other than options purchased), if any, are excluded from this calculation. |
| Largest Holdings [Text Block] | Top Ten States (as a % of Total Investments Footnote Reference New York 17.5% Illinois 15.2% Texas 7.7% Pennsylvania 7.6% California 5.4% Georgia 4.8% New Jersey 3.6% Florida 2.9% Utah 2.2% Indiana 2.1% Footnote Description Footnote Derivatives (other than options purchased), if any, are excluded from this calculation. |
| Material Fund Change [Text Block] | |
| C000089977 | |
| Shareholder Report [Line Items] | |
| Fund Name | Municipal Intermediate Bond Fund |
| Class Name | Class A |
| Trading Symbol | NMNAX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the Fund for the period of November 1, 2023 to October 31, 2024. |
| Shareholder Report Annual or Semi-Annual | Annual Shareholder Report |
| Additional Information [Text Block] | You can find additional information about the Fund at www.nb.com/en/us/products/mutual-funds/municipal-intermediate-bond-fund?section=documents fundinfo nb.com |
| Additional Information Phone Number | 800.877.9700 |
| Additional Information Email | fundinfo@nb.com</span>" id="sjs-B596"><span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left;">fundinfo@nb.com</span> |
| Additional Information Website | www.nb.com/en/us/products/mutual-funds/municipal-intermediate-bond-fund?section=documents</span>" id="sjs-B597"><span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left;">www.nb.com/en/us/products/mutual-funds/municipal-intermediate-bond-fund?section=documents</span> |
| Expenses [Text Block] | What were the Fund's costs for the year? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Class A $70 0.67% |
| Expenses Paid, Amount | $ 70 |
| Expense Ratio, Percent | 0.67% |
| Factors Affecting Performance [Text Block] | How did the Fund perform last year? The Fund’s long duration was beneficial as interest rates declined over the period. An emphasis on higher-yielding securities was also beneficial, as was security selection in the continuing care and charter school sectors. In contrast, high-quality pre-refunded securities and lower-coupon housing bonds were drags on performance. Relative to the Bloomberg 7-Year General Obligation (G.O.) Index (the Index), an overweight to A-rated securities and security selection of BBB-rated bonds were additive for results. Performance Attribution Top Contributors Top Detractors Duration positioning versus the Index Security selection in the continuing care and charter school sectors Overweight versus the Index to A-rated securities and security selection of BBB-rated bonds Pre-refunded securities Lower-coupon housing bonds |
| Performance Past Does Not Indicate Future [Text] | The investment return and principal value of an investment will fluctuate so that an investor’s shares, when redeemed, may be worth more or less than their original cost. Results represent the Fund's past performance, which is not a good predictor of how the Fund will perform in the future. Current performance may be lower or higher than the performance data quoted. |
| Line Graph [Table Text Block] | Class A (including sales charge) $10,952 Bloomberg Municipal Bond Index $12,548 Bloomberg 7-Year G.O. Index $12,068 10/31/14 $9,575 $10,000 $10,000 10/31/15 $9,719 $10,287 $10,263 10/31/16 $10,005 $10,704 $10,575 10/31/17 $10,102 $10,939 $10,734 10/31/18 $9,968 $10,883 $10,620 10/31/19 $10,789 $11,908 $11,537 10/31/20 $10,983 $12,336 $12,052 10/31/21 $11,272 $12,661 $12,180 10/31/22 $9,934 $11,144 $11,128 10/31/23 $10,138 $11,439 $11,336 10/31/24 $10,952 $12,548 $12,068 |
| Average Annual Return [Table Text Block] | Name 1 Year 5 Years 10 Years Class A (at NAV) 8.02% 0.30% 1.35% Class A (including sales charge) 3.44% (0.56)% 0.91% Bloomberg Municipal Bond Index 9.70% 1.05% 2.30% Bloomberg 7-Year G.O. Index 6.46% 0.90% 1.90% |
| Performance Table Market Index Changed [Text Block] | On July 24, 2024, the Fund began comparing its performance to the Bloomberg Municipal Bond Index in order to satisfy a change in regulatory requirements. The Bloomberg 7-Year G.O. Index will be maintained as a secondary index as it shows how the Fund’s performance compares to an index with characteristics that are more representative of the Fund's investment strategy than the Bloomberg Municipal Bond Index. |
| AssetsNet | $ 191,036,227 |
| Holdings Count | Holding | 210 |
| Advisory Fees Paid, Amount | $ 0 |
| InvestmentCompanyPortfolioTurnover | 89% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics Net Assets $191,036,227 Number of Portfolio Holdings 210 Portfolio Turnover Rate 89% Total Investment Advisory Fees Paid $0 |
| Holdings [Text Block] | Asset Allocation (as a % of Total Investments Footnote Reference Value Value Revenue Bonds 74.1% General Obligations 22.2% Tax Allocation 1.5% Special Assessment 1.2% Certificate Participation 0.5% Pre-Refunded 0.3% Special Tax 0.2% Footnote Description Footnote Derivatives (other than options purchased), if any, are excluded from this calculation. |
| Largest Holdings [Text Block] | Top Ten States (as a % of Total Investments Footnote Reference New York 17.5% Illinois 15.2% Texas 7.7% Pennsylvania 7.6% California 5.4% Georgia 4.8% New Jersey 3.6% Florida 2.9% Utah 2.2% Indiana 2.1% Footnote Description Footnote Derivatives (other than options purchased), if any, are excluded from this calculation. |
| Material Fund Change [Text Block] | |
| C000089978 | |
| Shareholder Report [Line Items] | |
| Fund Name | Municipal Intermediate Bond Fund |
| Class Name | Class C |
| Trading Symbol | NMNCX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the Fund for the period of November 1, 2023 to October 31, 2024. |
| Shareholder Report Annual or Semi-Annual | Annual Shareholder Report |
| Additional Information [Text Block] | You can find additional information about the Fund at www.nb.com/en/us/products/mutual-funds/municipal-intermediate-bond-fund?section=documents fundinfo nb.com |
| Additional Information Phone Number | 800.877.9700 |
| Additional Information Email | fundinfo@nb.com</span>" id="sjs-B623"><span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left;">fundinfo@nb.com</span> |
| Additional Information Website | www.nb.com/en/us/products/mutual-funds/municipal-intermediate-bond-fund?section=documents</span>" id="sjs-B624"><span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left;">www.nb.com/en/us/products/mutual-funds/municipal-intermediate-bond-fund?section=documents</span> |
| Expenses [Text Block] | What were the Fund's costs for the year? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Class C $147 1.42% |
| Expenses Paid, Amount | $ 147 |
| Expense Ratio, Percent | 1.42% |
| Factors Affecting Performance [Text Block] | How did the Fund perform last year? The Fund’s long duration was beneficial as interest rates declined over the period. An emphasis on higher-yielding securities was also beneficial, as was security selection in the continuing care and charter school sectors. In contrast, high-quality pre-refunded securities and lower-coupon housing bonds were drags on performance. Relative to the Bloomberg 7-Year General Obligation (G.O.) Index (the Index), an overweight to A-rated securities and security selection of BBB-rated bonds were additive for results. Performance Attribution Top Contributors Top Detractors Duration positioning versus the Index Security selection in the continuing care and charter school sectors Overweight versus the Index to A-rated securities and security selection of BBB-rated bonds Pre-refunded securities Lower-coupon housing bonds |
| Performance Past Does Not Indicate Future [Text] | The investment return and principal value of an investment will fluctuate so that an investor’s shares, when redeemed, may be worth more or less than their original cost. Results represent the Fund's past performance, which is not a good predictor of how the Fund will perform in the future. Current performance may be lower or higher than the performance data quoted. |
| Line Graph [Table Text Block] | Class C (including sales charge) $10,623 Bloomberg Municipal Bond Index $12,548 Bloomberg 7-Year G.O. Index $12,068 10/31/14 $10,000 $10,000 $10,000 10/31/15 $10,076 $10,287 $10,263 10/31/16 $10,295 $10,704 $10,575 10/31/17 $10,326 $10,939 $10,734 10/31/18 $10,104 $10,883 $10,620 10/31/19 $10,855 $11,908 $11,537 10/31/20 $10,977 $12,336 $12,052 10/31/21 $11,182 $12,661 $12,180 10/31/22 $9,781 $11,144 $11,128 10/31/23 $9,908 $11,439 $11,336 10/31/24 $10,623 $12,548 $12,068 |
| Average Annual Return [Table Text Block] | Name 1 Year 5 Years 10 Years Class C (at NAV) 7.22% (0.43)% 0.61% Class C (including sales charge) 6.22% (0.43)% 0.61% Bloomberg Municipal Bond Index 9.70% 1.05% 2.30% Bloomberg 7-Year G.O. Index 6.46% 0.90% 1.90% |
| Performance Table Market Index Changed [Text Block] | On July 24, 2024, the Fund began comparing its performance to the Bloomberg Municipal Bond Index in order to satisfy a change in regulatory requirements. The Bloomberg 7-Year G.O. Index will be maintained as a secondary index as it shows how the Fund’s performance compares to an index with characteristics that are more representative of the Fund's investment strategy than the Bloomberg Municipal Bond Index. |
| AssetsNet | $ 191,036,227 |
| Holdings Count | Holding | 210 |
| Advisory Fees Paid, Amount | $ 0 |
| InvestmentCompanyPortfolioTurnover | 89% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics Net Assets $191,036,227 Number of Portfolio Holdings 210 Portfolio Turnover Rate 89% Total Investment Advisory Fees Paid $0 |
| Holdings [Text Block] | Asset Allocation (as a % of Total Investments Footnote Reference Value Value Revenue Bonds 74.1% General Obligations 22.2% Tax Allocation 1.5% Special Assessment 1.2% Certificate Participation 0.5% Pre-Refunded 0.3% Special Tax 0.2% Footnote Description Footnote Derivatives (other than options purchased), if any, are excluded from this calculation. |
| Largest Holdings [Text Block] | Top Ten States (as a % of Total Investments Footnote Reference New York 17.5% Illinois 15.2% Texas 7.7% Pennsylvania 7.6% California 5.4% Georgia 4.8% New Jersey 3.6% Florida 2.9% Utah 2.2% Indiana 2.1% Footnote Description Footnote Derivatives (other than options purchased), if any, are excluded from this calculation. |
| Material Fund Change [Text Block] | |
| C000021325 | |
| Shareholder Report [Line Items] | |
| Fund Name | Core Bond Fund |
| Class Name | Investor Class |
| Trading Symbol | NCRIX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the Fund for the period of November 1, 2023 to October 31, 2024. |
| Shareholder Report Annual or Semi-Annual | Annual Shareholder Report |
| Additional Information [Text Block] | You can find additional information about the Fund at www.nb.com/en/us/products/mutual-funds/core-bond-fund?section=documents fundinfo nb.com |
| Additional Information Phone Number | 800.877.9700 |
| Additional Information Email | fundinfo@nb.com</span>" id="sjs-B650"><span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left;">fundinfo@nb.com</span> |
| Additional Information Website | www.nb.com/en/us/products/mutual-funds/core-bond-fund?section=documents</span>" id="sjs-B651"><span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left;">www.nb.com/en/us/products/mutual-funds/core-bond-fund?section=documents</span> |
| Expenses [Text Block] | What were the Fund's costs for the year? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Investor Class $82 0.78% |
| Expenses Paid, Amount | $ 82 |
| Expense Ratio, Percent | 0.78% |
| Factors Affecting Performance [Text Block] | How did the Fund perform last year? During the period, security selection and an overweight in investment-grade credit and commercial mortgage-backed securities (CMBS) versus the Bloomberg U.S. Aggregate Bond Index were significant contributors to performance. Security selection within asset-backed securities (ABS) was additive for returns. Elsewhere, the Fund’s exposures to non-agency mortgage-backed securities (MBS) and credit risk transfer (CRT) securities were rewarded. On the downside, the Fund’s duration positioning detracted from returns, as did its yield curve positioning. Performance Attribution Top Contributors Top Detractors Derivatives Investment-grade credit ABS and CMBS Non-agency MBS and CRT securities Duration positioning Yield curve positioning Futures contracts |
| Performance Past Does Not Indicate Future [Text] | The investment return and principal value of an investment will fluctuate so that an investor’s shares, when redeemed, may be worth more or less than their original cost. Results represent the Fund's past performance, which is not a good predictor of how the Fund will perform in the future. Current performance may be lower or higher than the performance data quoted. |
| Line Graph [Table Text Block] | Investor Class $11,392 Bloomberg U.S. Aggregate Bond Index $11,593 10/31/14 $10,000 $10,000 10/31/15 $10,128 $10,196 10/31/16 $10,549 $10,641 10/31/17 $10,606 $10,737 10/31/18 $10,307 $10,517 10/31/19 $11,421 $11,727 10/31/20 $12,193 $12,453 10/31/21 $12,311 $12,393 10/31/22 $10,262 $10,450 10/31/23 $10,255 $10,487 10/31/24 $11,392 $11,593 |
| Average Annual Return [Table Text Block] | Name 1 Year 5 Years 10 Years Investor Class 11.09% (0.05)% 1.31% Bloomberg U.S. Aggregate Bond Index 10.55% (0.23)% 1.49% |
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or on the redemption of Fund shares. |
| AssetsNet | $ 922,216,392 |
| Holdings Count | Holding | 859 |
| Advisory Fees Paid, Amount | $ 1,133,165 |
| InvestmentCompanyPortfolioTurnover | 156% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics Net Assets $922,216,392 Number of Portfolio Holdings 859 Portfolio Turnover Rate 156% Total Investment Advisory Fees Paid $1,133,165 |
| Holdings [Text Block] | Portfolio by Investment Type (as a % of Total Net Assets) Mortgage-Backed Securities 37.1% U.S. Treasury Obligations 26.0% Corporate Bonds 24.2% Asset-Backed Securities 9.1% Foreign Government Securities 1.7% U.S. Government Agency Securities 0.4% Short-Term Investments 1.5% Other Assets Less Liabilities 0.0% Footnote Reference Total 100.0% Footnote Description Footnote Includes the impact of the Fund's open positions in derivatives (other than options purchased), if any. |
| Largest Holdings [Text Block] | Top Ten Issuers (as a % of Total Investments Footnote Reference U.S. Treasury 26.0% Federal National Mortgage Association 14.7% Federal Home Loan Mortgage Corp. 11.1% Government National Mortgage Association 3.2% State Street Institutional U.S. Government Money Market Fund Premier Class 1.5% Warnermedia Holdings, Inc. 1.1% Broadcom, Inc. 1.0% Federal Home Loan Mortgage Corp. STACR REMIC Trust 0.9% Federal National Mortgage Association Connecticut Avenue Securities 0.8% Aon North America, Inc. 0.8% Footnote Description Footnote Derivatives (other than options purchased), if any, are excluded from this calculation. |
| Material Fund Change [Text Block] | |
| C000021326 | |
| Shareholder Report [Line Items] | |
| Fund Name | Core Bond Fund |
| Class Name | Institutional Class |
| Trading Symbol | NCRLX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the Fund for the period of November 1, 2023 to October 31, 2024. |
| Shareholder Report Annual or Semi-Annual | Annual Shareholder Report |
| Additional Information [Text Block] | You can find additional information about the Fund at www.nb.com/en/us/products/mutual-funds/core-bond-fund?section=documents issdl nb.com |
| Additional Information Phone Number | 800.366.6264 |
| Additional Information Email | issdl@nb.com</span>" id="sjs-B677"><span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left;">issdl@nb.com</span> |
| Additional Information Website | www.nb.com/en/us/products/mutual-funds/core-bond-fund?section=documents</span>" id="sjs-B678"><span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left;">www.nb.com/en/us/products/mutual-funds/core-bond-fund?section=documents</span> |
| Expenses [Text Block] | What were the Fund's costs for the year? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Institutional Class $40 0.38% |
| Expenses Paid, Amount | $ 40 |
| Expense Ratio, Percent | 0.38% |
| Factors Affecting Performance [Text Block] | How did the Fund perform last year? During the period, security selection and an overweight in investment-grade credit and commercial mortgage-backed securities (CMBS) versus the Bloomberg U.S. Aggregate Bond Index were significant contributors to performance. Security selection within asset-backed securities (ABS) was additive for returns. Elsewhere, the Fund’s exposures to non-agency mortgage-backed securities (MBS) and credit risk transfer (CRT) securities were rewarded. On the downside, the Fund’s duration positioning detracted from returns, as did its yield curve positioning. Performance Attribution Top Contributors Top Detractors Derivatives Investment-grade credit ABS and CMBS Non-agency MBS and CRT securities Duration positioning Yield curve positioning Futures contracts |
| Performance Past Does Not Indicate Future [Text] | The investment return and principal value of an investment will fluctuate so that an investor’s shares, when redeemed, may be worth more or less than their original cost. Results represent the Fund's past performance, which is not a good predictor of how the Fund will perform in the future. Current performance may be lower or higher than the performance data quoted. |
| Line Graph [Table Text Block] | Institutional Class $1,184,700 Bloomberg U.S. Aggregate Bond Index $1,159,300 10/31/14 $1,000,000 $1,000,000 10/31/15 $1,016,900 $1,019,600 10/31/16 $1,064,400 $1,064,100 10/31/17 $1,074,500 $1,073,700 10/31/18 $1,047,400 $1,051,700 10/31/19 $1,165,100 $1,172,700 10/31/20 $1,249,800 $1,245,300 10/31/21 $1,265,900 $1,239,300 10/31/22 $1,058,600 $1,045,000 10/31/23 $1,063,500 $1,048,700 10/31/24 $1,184,700 $1,159,300 |
| Average Annual Return [Table Text Block] | Name 1 Year 5 Years 10 Years Institutional Class 11.40% 0.33% 1.71% Bloomberg U.S. Aggregate Bond Index 10.55% (0.23)% 1.49% |
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or on the redemption of Fund shares. |
| AssetsNet | $ 922,216,392 |
| Holdings Count | Holding | 859 |
| Advisory Fees Paid, Amount | $ 1,133,165 |
| InvestmentCompanyPortfolioTurnover | 156% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics Net Assets $922,216,392 Number of Portfolio Holdings 859 Portfolio Turnover Rate 156% Total Investment Advisory Fees Paid $1,133,165 |
| Holdings [Text Block] | Portfolio by Investment Type (as a % of Total Net Assets) Mortgage-Backed Securities 37.1% U.S. Treasury Obligations 26.0% Corporate Bonds 24.2% Asset-Backed Securities 9.1% Foreign Government Securities 1.7% U.S. Government Agency Securities 0.4% Short-Term Investments 1.5% Other Assets Less Liabilities 0.0% Footnote Reference Total 100.0% Footnote Description Footnote Includes the impact of the Fund's open positions in derivatives (other than options purchased), if any. |
| Largest Holdings [Text Block] | Top Ten Issuers (as a % of Total Investments Footnote Reference U.S. Treasury 26.0% Federal National Mortgage Association 14.7% Federal Home Loan Mortgage Corp. 11.1% Government National Mortgage Association 3.2% State Street Institutional U.S. Government Money Market Fund Premier Class 1.5% Warnermedia Holdings, Inc. 1.1% Broadcom, Inc. 1.0% Federal Home Loan Mortgage Corp. STACR REMIC Trust 0.9% Federal National Mortgage Association Connecticut Avenue Securities 0.8% Aon North America, Inc. 0.8% Footnote Description Footnote Derivatives (other than options purchased), if any, are excluded from this calculation. |
| Material Fund Change [Text Block] | |
| C000057304 | |
| Shareholder Report [Line Items] | |
| Fund Name | Core Bond Fund |
| Class Name | Class A |
| Trading Symbol | NCRAX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the Fund for the period of November 1, 2023 to October 31, 2024. |
| Shareholder Report Annual or Semi-Annual | Annual Shareholder Report |
| Additional Information [Text Block] | You can find additional information about the Fund at www.nb.com/en/us/products/mutual-funds/core-bond-fund?section=documents fundinfo nb.com |
| Additional Information Phone Number | 800.877.9700 |
| Additional Information Email | fundinfo@nb.com</span>" id="sjs-B704"><span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left;">fundinfo@nb.com</span> |
| Additional Information Website | www.nb.com/en/us/products/mutual-funds/core-bond-fund?section=documents</span>" id="sjs-B705"><span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left;">www.nb.com/en/us/products/mutual-funds/core-bond-fund?section=documents</span> |
| Expenses [Text Block] | What were the Fund's costs for the year? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Class A $82 0.78% |
| Expenses Paid, Amount | $ 82 |
| Expense Ratio, Percent | 0.78% |
| Factors Affecting Performance [Text Block] | How did the Fund perform last year? During the period, security selection and an overweight in investment-grade credit and commercial mortgage-backed securities (CMBS) versus the Bloomberg U.S. Aggregate Bond Index were significant contributors to performance. Security selection within asset-backed securities (ABS) was additive for returns. Elsewhere, the Fund’s exposures to non-agency mortgage-backed securities (MBS) and credit risk transfer (CRT) securities were rewarded. On the downside, the Fund’s duration positioning detracted from returns, as did its yield curve positioning. Performance Attribution Top Contributors Top Detractors Derivatives Investment-grade credit ABS and CMBS Non-agency MBS and CRT securities Duration positioning Yield curve positioning Futures contracts |
| Performance Past Does Not Indicate Future [Text] | The investment return and principal value of an investment will fluctuate so that an investor’s shares, when redeemed, may be worth more or less than their original cost. Results represent the Fund's past performance, which is not a good predictor of how the Fund will perform in the future. Current performance may be lower or higher than the performance data quoted. |
| Line Graph [Table Text Block] | Class A (including sales charge) $10,890 Bloomberg U.S. Aggregate Bond Index $11,593 10/31/14 $9,575 $10,000 10/31/15 $9,684 $10,196 10/31/16 $10,097 $10,641 10/31/17 $10,151 $10,737 10/31/18 $9,864 $10,517 10/31/19 $10,931 $11,727 10/31/20 $11,670 $12,453 10/31/21 $11,783 $12,393 10/31/22 $9,808 $10,450 10/31/23 $9,813 $10,487 10/31/24 $10,890 $11,593 |
| Average Annual Return [Table Text Block] | Name 1 Year 5 Years 10 Years Class A (at NAV) 10.98% (0.08)% 1.30% Class A (including sales charge) 6.22% (0.95)% 0.86% Bloomberg U.S. Aggregate Bond Index 10.55% (0.23)% 1.49% |
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or on the redemption of Fund shares. |
| AssetsNet | $ 922,216,392 |
| Holdings Count | Holding | 859 |
| Advisory Fees Paid, Amount | $ 1,133,165 |
| InvestmentCompanyPortfolioTurnover | 156% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics Net Assets $922,216,392 Number of Portfolio Holdings 859 Portfolio Turnover Rate 156% Total Investment Advisory Fees Paid $1,133,165 |
| Holdings [Text Block] | Portfolio by Investment Type (as a % of Total Net Assets) Mortgage-Backed Securities 37.1% U.S. Treasury Obligations 26.0% Corporate Bonds 24.2% Asset-Backed Securities 9.1% Foreign Government Securities 1.7% U.S. Government Agency Securities 0.4% Short-Term Investments 1.5% Other Assets Less Liabilities 0.0% Footnote Reference Total 100.0% Footnote Description Footnote Includes the impact of the Fund's open positions in derivatives (other than options purchased), if any. |
| Largest Holdings [Text Block] | Top Ten Issuers (as a % of Total Investments Footnote Reference U.S. Treasury 26.0% Federal National Mortgage Association 14.7% Federal Home Loan Mortgage Corp. 11.1% Government National Mortgage Association 3.2% State Street Institutional U.S. Government Money Market Fund Premier Class 1.5% Warnermedia Holdings, Inc. 1.1% Broadcom, Inc. 1.0% Federal Home Loan Mortgage Corp. STACR REMIC Trust 0.9% Federal National Mortgage Association Connecticut Avenue Securities 0.8% Aon North America, Inc. 0.8% Footnote Description Footnote Derivatives (other than options purchased), if any, are excluded from this calculation. |
| Material Fund Change [Text Block] | |
| C000057305 | |
| Shareholder Report [Line Items] | |
| Fund Name | Core Bond Fund |
| Class Name | Class C |
| Trading Symbol | NCRCX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the Fund for the period of November 1, 2023 to October 31, 2024. |
| Shareholder Report Annual or Semi-Annual | Annual Shareholder Report |
| Additional Information [Text Block] | You can find additional information about the Fund at www.nb.com/en/us/products/mutual-funds/core-bond-fund?section=documents fundinfo nb.com |
| Additional Information Phone Number | 800.877.9700 |
| Additional Information Email | fundinfo@nb.com</span>" id="sjs-B731"><span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left;">fundinfo@nb.com</span> |
| Additional Information Website | www.nb.com/en/us/products/mutual-funds/core-bond-fund?section=documents</span>" id="sjs-B732"><span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left;">www.nb.com/en/us/products/mutual-funds/core-bond-fund?section=documents</span> |
| Expenses [Text Block] | What were the Fund's costs for the year? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Class C $161 1.53% |
| Expenses Paid, Amount | $ 161 |
| Expense Ratio, Percent | 1.53% |
| Factors Affecting Performance [Text Block] | How did the Fund perform last year? During the period, security selection and an overweight in investment-grade credit and commercial mortgage-backed securities (CMBS) versus the Bloomberg U.S. Aggregate Bond Index were significant contributors to performance. Security selection within asset-backed securities (ABS) was additive for returns. Elsewhere, the Fund’s exposures to non-agency mortgage-backed securities (MBS) and credit risk transfer (CRT) securities were rewarded. On the downside, the Fund’s duration positioning detracted from returns, as did its yield curve positioning. Performance Attribution Top Contributors Top Detractors Derivatives Investment-grade credit ABS and CMBS Non-agency MBS and CRT securities Duration positioning Yield curve positioning Futures contracts |
| Performance Past Does Not Indicate Future [Text] | The investment return and principal value of an investment will fluctuate so that an investor’s shares, when redeemed, may be worth more or less than their original cost. Results represent the Fund's past performance, which is not a good predictor of how the Fund will perform in the future. Current performance may be lower or higher than the performance data quoted. |
| Line Graph [Table Text Block] | Class C (including sales charge) $10,560 Bloomberg U.S. Aggregate Bond Index $11,593 10/31/14 $10,000 $10,000 10/31/15 $10,043 $10,196 10/31/16 $10,393 $10,641 10/31/17 $10,371 $10,737 10/31/18 $10,003 $10,517 10/31/19 $11,002 $11,727 10/31/20 $11,659 $12,453 10/31/21 $11,684 $12,393 10/31/22 $9,654 $10,450 10/31/23 $9,587 $10,487 10/31/24 $10,560 $11,593 |
| Average Annual Return [Table Text Block] | Name 1 Year 5 Years 10 Years Class C (at NAV) 10.14% (0.82)% 0.55% Class C (including sales charge) 9.14% (0.82)% 0.55% Bloomberg U.S. Aggregate Bond Index 10.55% (0.23)% 1.49% |
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or on the redemption of Fund shares. |
| AssetsNet | $ 922,216,392 |
| Holdings Count | Holding | 859 |
| Advisory Fees Paid, Amount | $ 1,133,165 |
| InvestmentCompanyPortfolioTurnover | 156% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics Net Assets $922,216,392 Number of Portfolio Holdings 859 Portfolio Turnover Rate 156% Total Investment Advisory Fees Paid $1,133,165 |
| Holdings [Text Block] | Portfolio by Investment Type (as a % of Total Net Assets) Mortgage-Backed Securities 37.1% U.S. Treasury Obligations 26.0% Corporate Bonds 24.2% Asset-Backed Securities 9.1% Foreign Government Securities 1.7% U.S. Government Agency Securities 0.4% Short-Term Investments 1.5% Other Assets Less Liabilities 0.0% Footnote Reference Total 100.0% Footnote Description Footnote Includes the impact of the Fund's open positions in derivatives (other than options purchased), if any. |
| Largest Holdings [Text Block] | Top Ten Issuers (as a % of Total Investments Footnote Reference U.S. Treasury 26.0% Federal National Mortgage Association 14.7% Federal Home Loan Mortgage Corp. 11.1% Government National Mortgage Association 3.2% State Street Institutional U.S. Government Money Market Fund Premier Class 1.5% Warnermedia Holdings, Inc. 1.1% Broadcom, Inc. 1.0% Federal Home Loan Mortgage Corp. STACR REMIC Trust 0.9% Federal National Mortgage Association Connecticut Avenue Securities 0.8% Aon North America, Inc. 0.8% Footnote Description Footnote Derivatives (other than options purchased), if any, are excluded from this calculation. |
| Material Fund Change [Text Block] | |
| C000153036 | |
| Shareholder Report [Line Items] | |
| Fund Name | Core Bond Fund |
| Class Name | Class R6 |
| Trading Symbol | NRCRX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the Fund for the period of November 1, 2023 to October 31, 2024. |
| Shareholder Report Annual or Semi-Annual | Annual Shareholder Report |
| Additional Information [Text Block] | You can find additional information about the Fund at www.nb.com/en/us/products/mutual-funds/core-bond-fund?section=documents issdl nb.com |
| Additional Information Phone Number | 800.366.6264 |
| Additional Information Email | issdl@nb.com</span>" id="sjs-B758"><span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left;">issdl@nb.com</span> |
| Additional Information Website | www.nb.com/en/us/products/mutual-funds/core-bond-fund?section=documents</span>" id="sjs-B759"><span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left;">www.nb.com/en/us/products/mutual-funds/core-bond-fund?section=documents</span> |
| Expenses [Text Block] | What were the Fund's costs for the year? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Class R6 $30 0.28% |
| Expenses Paid, Amount | $ 30 |
| Expense Ratio, Percent | 0.28% |
| Factors Affecting Performance [Text Block] | How did the Fund perform last year? During the period, security selection and an overweight in investment-grade credit and commercial mortgage-backed securities (CMBS) versus the Bloomberg U.S. Aggregate Bond Index were significant contributors to performance. Security selection within asset-backed securities (ABS) was additive for returns. Elsewhere, the Fund’s exposures to non-agency mortgage-backed securities (MBS) and credit risk transfer (CRT) securities were rewarded. On the downside, the Fund’s duration positioning detracted from returns, as did its yield curve positioning. Performance Attribution Top Contributors Top Detractors Derivatives Investment-grade credit ABS and CMBS Non-agency MBS and CRT securities Duration positioning Yield curve positioning Futures contracts |
| Performance Past Does Not Indicate Future [Text] | The investment return and principal value of an investment will fluctuate so that an investor’s shares, when redeemed, may be worth more or less than their original cost. Results represent the Fund's past performance, which is not a good predictor of how the Fund will perform in the future. Current performance may be lower or higher than the performance data quoted. |
| Line Graph [Table Text Block] | Class R6 $11,930 Bloomberg U.S. Aggregate Bond Index $11,593 10/31/14 $10,000 $10,000 10/31/15 $10,169 $10,196 10/31/16 $10,644 $10,641 10/31/17 $10,745 $10,737 10/31/18 $10,474 $10,517 10/31/19 $11,660 $11,727 10/31/20 $12,521 $12,453 10/31/21 $12,695 $12,393 10/31/22 $10,627 $10,450 10/31/23 $10,686 $10,487 10/31/24 $11,930 $11,593 |
| Average Annual Return [Table Text Block] | Name 1 Year 5 Years 10 Years Class R6 11.63% 0.46% 1.78% Bloomberg U.S. Aggregate Bond Index 10.55% (0.23)% 1.49% |
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or on the redemption of Fund shares. The performance prior to Class R6's inception date of January 18, 2019 is that of the Fund's Institutional Class, which had higher expenses than Class R6 so its performance typically would have been lower than that of Class R6. |
| AssetsNet | $ 922,216,392 |
| Holdings Count | Holding | 859 |
| Advisory Fees Paid, Amount | $ 1,133,165 |
| InvestmentCompanyPortfolioTurnover | 156% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics Net Assets $922,216,392 Number of Portfolio Holdings 859 Portfolio Turnover Rate 156% Total Investment Advisory Fees Paid $1,133,165 |
| Holdings [Text Block] | Portfolio by Investment Type (as a % of Total Net Assets) Mortgage-Backed Securities 37.1% U.S. Treasury Obligations 26.0% Corporate Bonds 24.2% Asset-Backed Securities 9.1% Foreign Government Securities 1.7% U.S. Government Agency Securities 0.4% Short-Term Investments 1.5% Other Assets Less Liabilities 0.0% Footnote Reference Total 100.0% Footnote Description Footnote Includes the impact of the Fund's open positions in derivatives (other than options purchased), if any. |
| Largest Holdings [Text Block] | Top Ten Issuers (as a % of Total Investments Footnote Reference U.S. Treasury 26.0% Federal National Mortgage Association 14.7% Federal Home Loan Mortgage Corp. 11.1% Government National Mortgage Association 3.2% State Street Institutional U.S. Government Money Market Fund Premier Class 1.5% Warnermedia Holdings, Inc. 1.1% Broadcom, Inc. 1.0% Federal Home Loan Mortgage Corp. STACR REMIC Trust 0.9% Federal National Mortgage Association Connecticut Avenue Securities 0.8% Aon North America, Inc. 0.8% Footnote Description Footnote Derivatives (other than options purchased), if any, are excluded from this calculation. |
| Material Fund Change [Text Block] | |
| C000044074 | |
| Shareholder Report [Line Items] | |
| Fund Name | Strategic Income Fund |
| Class Name | Trust Class |
| Trading Symbol | NSTTX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the Fund for the period of November 1, 2023 to October 31, 2024. |
| Shareholder Report Annual or Semi-Annual | Annual Shareholder Report |
| Additional Information [Text Block] | You can find additional information about the Fund at www.nb.com/en/us/products/mutual-funds/strategic-income-fund?section=documents fundinfo nb.com |
| Additional Information Phone Number | 800.877.9700 |
| Additional Information Email | fundinfo@nb.com</span>" id="sjs-B785"><span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left;">fundinfo@nb.com</span> |
| Additional Information Website | www.nb.com/en/us/products/mutual-funds/strategic-income-fund?section=documents</span>" id="sjs-B786"><span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left;">www.nb.com/en/us/products/mutual-funds/strategic-income-fund?section=documents</span> |
| Expenses [Text Block] | What were the Fund's costs for the year? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Trust Class $101 0.94% |
| Expenses Paid, Amount | $ 101 |
| Expense Ratio, Percent | 0.94% |
| Factors Affecting Performance [Text Block] | How did the Fund perform last year? The Fund outperformed its benchmark, the Bloomberg U.S. Aggregate Bond Index (the Index). The top contributors to performance, relative to the Index, included an allocation to U.S. and non-U.S. developed markets high-yield corporate bonds, overweight to agency mortgage-backed securities (MBS), security selection of investment-grade credit, underweight to U.S. Treasuries and overall duration positioning. The top detractors from relative performance were an underweight to investment-grade credit versus the Index, and security selection within agency MBS. Performance Attribution Top Contributors Top Detractors Derivatives Allocation across U.S. and non-U.S. developed markets high-yield credit Overweight to agency MBS versus the Index Security selection within investment-grade credit Underweight to U.S. Treasuries Duration positioning Underweight to investment-grade credit versus the Index Security selection within agency MBS Bond forward contracts Futures Swaps Forward foreign currency contracts |
| Performance Past Does Not Indicate Future [Text] | The investment return and principal value of an investment will fluctuate so that an investor’s shares, when redeemed, may be worth more or less than their original cost. Results represent the Fund's past performance, which is not a good predictor of how the Fund will perform in the future. Current performance may be lower or higher than the performance data quoted. |
| Line Graph [Table Text Block] | Trust Class $13,313 Bloomberg U.S. Aggregate Bond Index $11,593 10/31/14 $10,000 $10,000 10/31/15 $9,897 $10,196 10/31/16 $10,481 $10,641 10/31/17 $10,910 $10,737 10/31/18 $10,774 $10,517 10/31/19 $11,593 $11,727 10/31/20 $11,988 $12,453 10/31/21 $12,970 $12,393 10/31/22 $11,178 $10,450 10/31/23 $11,649 $10,487 10/31/24 $13,313 $11,593 |
| Average Annual Return [Table Text Block] | Name 1 Year 5 Years 10 Years Trust Class 14.28% 2.81% 2.90% Bloomberg U.S. Aggregate Bond Index 10.55% (0.23)% 1.49% |
| AssetsNet | $ 5,345,864,880 |
| Holdings Count | Holding | 2,230 |
| Advisory Fees Paid, Amount | $ 17,656,691 |
| InvestmentCompanyPortfolioTurnover | 71% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics Net Assets $5,345,864,880 Number of Portfolio Holdings 2,230 Portfolio Turnover Rate 71% Total Investment Advisory Fees Paid $17,656,691 |
| Holdings [Text Block] | Portfolio by Investment Type (as a % of Total Net Assets) Mortgage-Backed Securities 52.7% Corporate Bonds 26.2% Asset-Backed Securities 10.7% U.S. Treasury Obligations 4.2% Foreign Government Securities 4.1% Exchange-Traded Funds 2.1% Municipal Notes 0.6% U.S. Government Agency Securities 0.0% Loan Assignments 0.0% Convertible Bonds 0.0% Closed-End Funds 0.0% Short-Term Investments 1.6% Liabilities Less Other Assets (2.2)% Footnote Reference Total 100.0% Footnote Description Footnote Includes the impact of the Fund's open positions in derivatives (other than options purchased), if any. |
| Largest Holdings [Text Block] | Top Ten Issuers (as a % of Total Investments Footnote Reference Federal National Mortgage Association 17.6% Federal Home Loan Mortgage Corp. 14.2% U.S. Treasury 4.1% Government National Mortgage Association 3.2% Federal Home Loan Mortgage Corp. STACR REMIC 2.9% Federal National Mortgage Association Connecticut Avenue Securities 2.6% State Street Institutional U.S. Government Money Market Fund Premier Class 1.5% BX Trust 1.1% Verus Securitization Trust 0.9% iShares iBoxx $ Investment Grade Corporate Bond ETF 0.9% Footnote Description Footnote Derivatives (other than options purchased), if any, are excluded from this calculation. |
| Material Fund Change [Text Block] | |
| C000021324 | |
| Shareholder Report [Line Items] | |
| Fund Name | Strategic Income Fund |
| Class Name | Institutional Class |
| Trading Symbol | NSTLX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the Fund for the period of November 1, 2023 to October 31, 2024. |
| Shareholder Report Annual or Semi-Annual | Annual Shareholder Report |
| Additional Information [Text Block] | You can find additional information about the Fund at www.nb.com/en/us/products/mutual-funds/strategic-income-fund?section=documents issdl nb.com |
| Additional Information Phone Number | 800.366.6264 |
| Additional Information Email | issdl@nb.com</span>" id="sjs-B811"><span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left;">issdl@nb.com</span> |
| Additional Information Website | www.nb.com/en/us/products/mutual-funds/strategic-income-fund?section=documents</span>" id="sjs-B812"><span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left;">www.nb.com/en/us/products/mutual-funds/strategic-income-fund?section=documents</span> |
| Expenses [Text Block] | What were the Fund's costs for the year? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Institutional Class $63 0.59% |
| Expenses Paid, Amount | $ 63 |
| Expense Ratio, Percent | 0.59% |
| Factors Affecting Performance [Text Block] | How did the Fund perform last year? The Fund outperformed its benchmark, the Bloomberg U.S. Aggregate Bond Index (the Index). The top contributors to performance, relative to the Index, included an allocation to U.S. and non-U.S. developed markets high-yield corporate bonds, overweight to agency mortgage-backed securities (MBS), security selection of investment-grade credit, underweight to U.S. Treasuries and overall duration positioning. The top detractors from relative performance were an underweight to investment-grade credit versus the Index, and security selection within agency MBS. Performance Attribution Top Contributors Top Detractors Derivatives Allocation across U.S. and non-U.S. developed markets high-yield credit Overweight to agency MBS versus the Index Security selection within investment-grade credit Underweight to U.S. Treasuries Duration positioning Underweight to investment-grade credit versus the Index Security selection within agency MBS Bond forward contracts Futures Swaps Forward foreign currency contracts |
| Performance Past Does Not Indicate Future [Text] | The investment return and principal value of an investment will fluctuate so that an investor’s shares, when redeemed, may be worth more or less than their original cost. Results represent the Fund's past performance, which is not a good predictor of how the Fund will perform in the future. Current performance may be lower or higher than the performance data quoted. |
| Line Graph [Table Text Block] | Institutional Class $1,378,600 Bloomberg U.S. Aggregate Bond Index $1,159,300 10/31/14 $1,000,000 $1,000,000 10/31/15 $993,100 $1,019,600 10/31/16 $1,056,500 $1,064,100 10/31/17 $1,103,500 $1,073,700 10/31/18 $1,093,600 $1,051,700 10/31/19 $1,179,700 $1,172,700 10/31/20 $1,225,400 $1,245,300 10/31/21 $1,330,300 $1,239,300 10/31/22 $1,149,500 $1,045,000 10/31/23 $1,202,200 $1,048,700 10/31/24 $1,378,600 $1,159,300 |
| Average Annual Return [Table Text Block] | Name 1 Year 5 Years 10 Years Institutional Class 14.68% 3.16% 3.26% Bloomberg U.S. Aggregate Bond Index 10.55% (0.23)% 1.49% |
| AssetsNet | $ 5,345,864,880 |
| Holdings Count | Holding | 2,230 |
| Advisory Fees Paid, Amount | $ 17,656,691 |
| InvestmentCompanyPortfolioTurnover | 71% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics Net Assets $5,345,864,880 Number of Portfolio Holdings 2,230 Portfolio Turnover Rate 71% Total Investment Advisory Fees Paid $17,656,691 |
| Holdings [Text Block] | Portfolio by Investment Type (as a % of Total Net Assets) Mortgage-Backed Securities 52.7% Corporate Bonds 26.2% Asset-Backed Securities 10.7% U.S. Treasury Obligations 4.2% Foreign Government Securities 4.1% Exchange-Traded Funds 2.1% Municipal Notes 0.6% U.S. Government Agency Securities 0.0% Loan Assignments 0.0% Convertible Bonds 0.0% Closed-End Funds 0.0% Short-Term Investments 1.6% Liabilities Less Other Assets (2.2)% Footnote Reference Total 100.0% Footnote Description Footnote Includes the impact of the Fund's open positions in derivatives (other than options purchased), if any. |
| Largest Holdings [Text Block] | Top Ten Issuers (as a % of Total Investments Footnote Reference Federal National Mortgage Association 17.6% Federal Home Loan Mortgage Corp. 14.2% U.S. Treasury 4.1% Government National Mortgage Association 3.2% Federal Home Loan Mortgage Corp. STACR REMIC 2.9% Federal National Mortgage Association Connecticut Avenue Securities 2.6% State Street Institutional U.S. Government Money Market Fund Premier Class 1.5% BX Trust 1.1% Verus Securitization Trust 0.9% iShares iBoxx $ Investment Grade Corporate Bond ETF 0.9% Footnote Description Footnote Derivatives (other than options purchased), if any, are excluded from this calculation. |
| Material Fund Change [Text Block] | |
| C000057302 | |
| Shareholder Report [Line Items] | |
| Fund Name | Strategic Income Fund |
| Class Name | Class A |
| Trading Symbol | NSTAX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the Fund for the period of November 1, 2023 to October 31, 2024. |
| Shareholder Report Annual or Semi-Annual | Annual Shareholder Report |
| Additional Information [Text Block] | You can find additional information about the Fund at www.nb.com/en/us/products/mutual-funds/strategic-income-fund?section=documents fundinfo nb.com |
| Additional Information Phone Number | 800.877.9700 |
| Additional Information Email | fundinfo@nb.com</span>" id="sjs-B837"><span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left;">fundinfo@nb.com</span> |
| Additional Information Website | www.nb.com/en/us/products/mutual-funds/strategic-income-fund?section=documents</span>" id="sjs-B838"><span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left;">www.nb.com/en/us/products/mutual-funds/strategic-income-fund?section=documents</span> |
| Expenses [Text Block] | What were the Fund's costs for the year? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Class A $104 0.97% |
| Expenses Paid, Amount | $ 104 |
| Expense Ratio, Percent | 0.97% |
| Factors Affecting Performance [Text Block] | How did the Fund perform last year? The Fund outperformed its benchmark, the Bloomberg U.S. Aggregate Bond Index (the Index). The top contributors to performance, relative to the Index, included an allocation to U.S. and non-U.S. developed markets high-yield corporate bonds, overweight to agency mortgage-backed securities (MBS), security selection of investment-grade credit, underweight to U.S. Treasuries and overall duration positioning. The top detractors from relative performance were an underweight to investment-grade credit versus the Index, and security selection within agency MBS. Performance Attribution Top Contributors Top Detractors Derivatives Allocation across U.S. and non-U.S. developed markets high-yield credit Overweight to agency MBS versus the Index Security selection within investment-grade credit Underweight to U.S. Treasuries Duration positioning Underweight to investment-grade credit versus the Index Security selection within agency MBS Bond forward contracts Futures Swaps Forward foreign currency contracts |
| Performance Past Does Not Indicate Future [Text] | The investment return and principal value of an investment will fluctuate so that an investor’s shares, when redeemed, may be worth more or less than their original cost. Results represent the Fund's past performance, which is not a good predictor of how the Fund will perform in the future. Current performance may be lower or higher than the performance data quoted. |
| Line Graph [Table Text Block] | Class A (including sales charge) $12,923 Bloomberg U.S. Aggregate Bond Index $11,593 10/31/14 $9,750 $10,000 10/31/15 $9,645 $10,196 10/31/16 $10,219 $10,641 10/31/17 $10,631 $10,737 10/31/18 $10,495 $10,517 10/31/19 $11,276 $11,727 10/31/20 $11,666 $12,453 10/31/21 $12,614 $12,393 10/31/22 $10,858 $10,450 10/31/23 $11,312 $10,487 10/31/24 $12,923 $11,593 |
| Average Annual Return [Table Text Block] | Name 1 Year 5 Years 10 Years Class A (at NAV) 14.24% 2.76% 2.86% Class A (including sales charge) 11.43% 2.25% 2.60% Bloomberg U.S. Aggregate Bond Index 10.55% (0.23)% 1.49% |
| AssetsNet | $ 5,345,864,880 |
| Holdings Count | Holding | 2,230 |
| Advisory Fees Paid, Amount | $ 17,656,691 |
| InvestmentCompanyPortfolioTurnover | 71% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics Net Assets $5,345,864,880 Number of Portfolio Holdings 2,230 Portfolio Turnover Rate 71% Total Investment Advisory Fees Paid $17,656,691 |
| Holdings [Text Block] | Portfolio by Investment Type (as a % of Total Net Assets) Mortgage-Backed Securities 52.7% Corporate Bonds 26.2% Asset-Backed Securities 10.7% U.S. Treasury Obligations 4.2% Foreign Government Securities 4.1% Exchange-Traded Funds 2.1% Municipal Notes 0.6% U.S. Government Agency Securities 0.0% Loan Assignments 0.0% Convertible Bonds 0.0% Closed-End Funds 0.0% Short-Term Investments 1.6% Liabilities Less Other Assets (2.2)% Footnote Reference Total 100.0% Footnote Description Footnote Includes the impact of the Fund's open positions in derivatives (other than options purchased), if any. |
| Largest Holdings [Text Block] | Top Ten Issuers (as a % of Total Investments Footnote Reference Federal National Mortgage Association 17.6% Federal Home Loan Mortgage Corp. 14.2% U.S. Treasury 4.1% Government National Mortgage Association 3.2% Federal Home Loan Mortgage Corp. STACR REMIC 2.9% Federal National Mortgage Association Connecticut Avenue Securities 2.6% State Street Institutional U.S. Government Money Market Fund Premier Class 1.5% BX Trust 1.1% Verus Securitization Trust 0.9% iShares iBoxx $ Investment Grade Corporate Bond ETF 0.9% Footnote Description Footnote Derivatives (other than options purchased), if any, are excluded from this calculation. |
| Material Fund Change [Text Block] | |
| C000057303 | |
| Shareholder Report [Line Items] | |
| Fund Name | Strategic Income Fund |
| Class Name | Class C |
| Trading Symbol | NSTCX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the Fund for the period of November 1, 2023 to October 31, 2024. |
| Shareholder Report Annual or Semi-Annual | Annual Shareholder Report |
| Additional Information [Text Block] | You can find additional information about the Fund at www.nb.com/en/us/products/mutual-funds/strategic-income-fund?section=documents fundinfo nb.com |
| Additional Information Phone Number | 800.877.9700 |
| Additional Information Email | fundinfo@nb.com</span>" id="sjs-B863"><span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left;">fundinfo@nb.com</span> |
| Additional Information Website | www.nb.com/en/us/products/mutual-funds/strategic-income-fund?section=documents</span>" id="sjs-B864"><span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left;">www.nb.com/en/us/products/mutual-funds/strategic-income-fund?section=documents</span> |
| Expenses [Text Block] | What were the Fund's costs for the year? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Class C $180 1.69% |
| Expenses Paid, Amount | $ 180 |
| Expense Ratio, Percent | 1.69% |
| Factors Affecting Performance [Text Block] | How did the Fund perform last year? The Fund outperformed its benchmark, the Bloomberg U.S. Aggregate Bond Index (the Index). The top contributors to performance, relative to the Index, included an allocation to U.S. and non-U.S. developed markets high-yield corporate bonds, overweight to agency mortgage-backed securities (MBS), security selection of investment-grade credit, underweight to U.S. Treasuries and overall duration positioning. The top detractors from relative performance were an underweight to investment-grade credit versus the Index, and security selection within agency MBS. Performance Attribution Top Contributors Top Detractors Derivatives Allocation across U.S. and non-U.S. developed markets high-yield credit Overweight to agency MBS versus the Index Security selection within investment-grade credit Underweight to U.S. Treasuries Duration positioning Underweight to investment-grade credit versus the Index Security selection within agency MBS Bond forward contracts Futures Swaps Forward foreign currency contracts |
| Performance Past Does Not Indicate Future [Text] | The investment return and principal value of an investment will fluctuate so that an investor’s shares, when redeemed, may be worth more or less than their original cost. Results represent the Fund's past performance, which is not a good predictor of how the Fund will perform in the future. Current performance may be lower or higher than the performance data quoted. |
| Line Graph [Table Text Block] | Class C (including sales charge) $12,353 Bloomberg U.S. Aggregate Bond Index $11,593 10/31/14 $10,000 $10,000 10/31/15 $9,823 $10,196 10/31/16 $10,326 $10,641 10/31/17 $10,668 $10,737 10/31/18 $10,467 $10,517 10/31/19 $11,168 $11,727 10/31/20 $11,463 $12,453 10/31/21 $12,320 $12,393 10/31/22 $10,528 $10,450 10/31/23 $10,891 $10,487 10/31/24 $12,353 $11,593 |
| Average Annual Return [Table Text Block] | Name 1 Year 5 Years 10 Years Class C (at NAV) 13.43% 2.04% 2.14% Class C (including sales charge) 12.43% 2.04% 2.14% Bloomberg U.S. Aggregate Bond Index 10.55% (0.23)% 1.49% |
| AssetsNet | $ 5,345,864,880 |
| Holdings Count | Holding | 2,230 |
| Advisory Fees Paid, Amount | $ 17,656,691 |
| InvestmentCompanyPortfolioTurnover | 71% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics Net Assets $5,345,864,880 Number of Portfolio Holdings 2,230 Portfolio Turnover Rate 71% Total Investment Advisory Fees Paid $17,656,691 |
| Holdings [Text Block] | Portfolio by Investment Type (as a % of Total Net Assets) Mortgage-Backed Securities 52.7% Corporate Bonds 26.2% Asset-Backed Securities 10.7% U.S. Treasury Obligations 4.2% Foreign Government Securities 4.1% Exchange-Traded Funds 2.1% Municipal Notes 0.6% U.S. Government Agency Securities 0.0% Loan Assignments 0.0% Convertible Bonds 0.0% Closed-End Funds 0.0% Short-Term Investments 1.6% Liabilities Less Other Assets (2.2)% Footnote Reference Total 100.0% Footnote Description Footnote Includes the impact of the Fund's open positions in derivatives (other than options purchased), if any. |
| Largest Holdings [Text Block] | Top Ten Issuers (as a % of Total Investments Footnote Reference Federal National Mortgage Association 17.6% Federal Home Loan Mortgage Corp. 14.2% U.S. Treasury 4.1% Government National Mortgage Association 3.2% Federal Home Loan Mortgage Corp. STACR REMIC 2.9% Federal National Mortgage Association Connecticut Avenue Securities 2.6% State Street Institutional U.S. Government Money Market Fund Premier Class 1.5% BX Trust 1.1% Verus Securitization Trust 0.9% iShares iBoxx $ Investment Grade Corporate Bond ETF 0.9% Footnote Description Footnote Derivatives (other than options purchased), if any, are excluded from this calculation. |
| Material Fund Change [Text Block] | |
| C000125076 | |
| Shareholder Report [Line Items] | |
| Fund Name | Strategic Income Fund |
| Class Name | Class R6 |
| Trading Symbol | NRSIX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the Fund for the period of November 1, 2023 to October 31, 2024. |
| Shareholder Report Annual or Semi-Annual | Annual Shareholder Report |
| Additional Information [Text Block] | You can find additional information about the Fund at www.nb.com/en/us/products/mutual-funds/strategic-income-fund?section=documents issdl nb.com |
| Additional Information Phone Number | 800.366.6264 |
| Additional Information Email | issdl@nb.com</span>" id="sjs-B889"><span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left;">issdl@nb.com</span> |
| Additional Information Website | www.nb.com/en/us/products/mutual-funds/strategic-income-fund?section=documents</span>" id="sjs-B890"><span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left;">www.nb.com/en/us/products/mutual-funds/strategic-income-fund?section=documents</span> |
| Expenses [Text Block] | What were the Fund's costs for the year? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Class R6 $53 0.49% |
| Expenses Paid, Amount | $ 53 |
| Expense Ratio, Percent | 0.49% |
| Factors Affecting Performance [Text Block] | How did the Fund perform last year? The Fund outperformed its benchmark, the Bloomberg U.S. Aggregate Bond Index (the Index). The top contributors to performance, relative to the Index, included an allocation to U.S. and non-U.S. developed markets high-yield corporate bonds, overweight to agency mortgage-backed securities (MBS), security selection of investment-grade credit, underweight to U.S. Treasuries and overall duration positioning. The top detractors from relative performance were an underweight to investment-grade credit versus the Index, and security selection within agency MBS. Performance Attribution Top Contributors Top Detractors Derivatives Allocation across U.S. and non-U.S. developed markets high-yield credit Overweight to agency MBS versus the Index Security selection within investment-grade credit Underweight to U.S. Treasuries Duration positioning Underweight to investment-grade credit versus the Index Security selection within agency MBS Bond forward contracts Futures Swaps Forward foreign currency contracts |
| Performance Past Does Not Indicate Future [Text] | The investment return and principal value of an investment will fluctuate so that an investor’s shares, when redeemed, may be worth more or less than their original cost. Results represent the Fund's past performance, which is not a good predictor of how the Fund will perform in the future. Current performance may be lower or higher than the performance data quoted. |
| Line Graph [Table Text Block] | Class R6 $13,894 Bloomberg U.S. Aggregate Bond Index $11,593 10/31/14 $10,000 $10,000 10/31/15 $9,938 $10,196 10/31/16 $10,570 $10,641 10/31/17 $11,048 $10,737 10/31/18 $10,957 $10,517 10/31/19 $11,832 $11,727 10/31/20 $12,302 $12,453 10/31/21 $13,368 $12,393 10/31/22 $11,561 $10,450 10/31/23 $12,103 $10,487 10/31/24 $13,894 $11,593 |
| Average Annual Return [Table Text Block] | Name 1 Year 5 Years 10 Years Class R6 14.80% 3.27% 3.34% Bloomberg U.S. Aggregate Bond Index 10.55% (0.23)% 1.49% |
| AssetsNet | $ 5,345,864,880 |
| Holdings Count | Holding | 2,230 |
| Advisory Fees Paid, Amount | $ 17,656,691 |
| InvestmentCompanyPortfolioTurnover | 71% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics Net Assets $5,345,864,880 Number of Portfolio Holdings 2,230 Portfolio Turnover Rate 71% Total Investment Advisory Fees Paid $17,656,691 |
| Holdings [Text Block] | Portfolio by Investment Type (as a % of Total Net Assets) Mortgage-Backed Securities 52.7% Corporate Bonds 26.2% Asset-Backed Securities 10.7% U.S. Treasury Obligations 4.2% Foreign Government Securities 4.1% Exchange-Traded Funds 2.1% Municipal Notes 0.6% U.S. Government Agency Securities 0.0% Loan Assignments 0.0% Convertible Bonds 0.0% Closed-End Funds 0.0% Short-Term Investments 1.6% Liabilities Less Other Assets (2.2)% Footnote Reference Total 100.0% Footnote Description Footnote Includes the impact of the Fund's open positions in derivatives (other than options purchased), if any. |
| Largest Holdings [Text Block] | Top Ten Issuers (as a % of Total Investments Footnote Reference Federal National Mortgage Association 17.6% Federal Home Loan Mortgage Corp. 14.2% U.S. Treasury 4.1% Government National Mortgage Association 3.2% Federal Home Loan Mortgage Corp. STACR REMIC 2.9% Federal National Mortgage Association Connecticut Avenue Securities 2.6% State Street Institutional U.S. Government Money Market Fund Premier Class 1.5% BX Trust 1.1% Verus Securitization Trust 0.9% iShares iBoxx $ Investment Grade Corporate Bond ETF 0.9% Footnote Description Footnote Derivatives (other than options purchased), if any, are excluded from this calculation. |
| Material Fund Change [Text Block] |
| Shareholder Report, Line Graph (Details) - USD ($) | 12 Months Ended | |||||||||||
| Oct. 31, 2024 | Oct. 31, 2023 | Oct. 31, 2022 | Oct. 31, 2021 | Oct. 31, 2020 | Oct. 31, 2019 | Oct. 31, 2018 | Oct. 31, 2017 | Oct. 31, 2016 | Oct. 31, 2015 | Jun. 22, 2015 | Oct. 31, 2014 | |
| C000129449 | ||||||||||||
| Account Value [Line Items] | ||||||||||||
| Line Graph and Table Measure Name | Institutional Class $1,165,400 | |||||||||||
| C000129447 | ||||||||||||
| Account Value [Line Items] | ||||||||||||
| Line Graph and Table Measure Name | Class A (including sales charge) $10,728 | |||||||||||
| Account Value | $ 10,728 | $ 9,474 | $ 8,525 | $ 10,904 | $ 10,576 | $ 10,684 | $ 9,467 | $ 10,126 | $ 9,529 | $ 8,527 | $ 9,575 | |
| C000129448 | ||||||||||||
| Account Value [Line Items] | ||||||||||||
| Line Graph and Table Measure Name | Class C (including sales charge) $10,406 | |||||||||||
| Account Value | $ 10,406 | 9,249 | 8,385 | 10,805 | 10,571 | 10,746 | 9,593 | 10,338 | 9,802 | 8,836 | 10,000 | |
| C000082160 | ||||||||||||
| Account Value [Line Items] | ||||||||||||
| Line Graph and Table Measure Name | Institutional Class $1,558,100 | |||||||||||
| C000082158 | ||||||||||||
| Account Value [Line Items] | ||||||||||||
| Line Graph and Table Measure Name | Class A (including sales charge) $14,376 | |||||||||||
| Account Value | $ 14,376 | 13,019 | 11,701 | 12,104 | 11,236 | 10,968 | 10,779 | 10,458 | 10,080 | 9,670 | 9,575 | |
| C000082159 | ||||||||||||
| Account Value [Line Items] | ||||||||||||
| Line Graph and Table Measure Name | Class C (including sales charge) $13,918 | |||||||||||
| Account Value | $ 13,918 | 12,711 | 11,510 | 11,985 | 11,221 | 11,035 | 10,927 | 10,682 | 10,372 | 10,035 | 10,000 | |
| C000021322 | ||||||||||||
| Account Value [Line Items] | ||||||||||||
| Line Graph and Table Measure Name | Investor Class $14,449 | |||||||||||
| Account Value | $ 14,449 | 12,507 | 12,022 | 13,603 | 12,456 | 12,111 | 11,243 | 11,227 | 10,508 | 9,739 | 10,000 | |
| C000064460 | ||||||||||||
| Account Value [Line Items] | ||||||||||||
| Line Graph and Table Measure Name | Institutional Class $1,467,300 | |||||||||||
| C000077167 | ||||||||||||
| Account Value [Line Items] | ||||||||||||
| Line Graph and Table Measure Name | Class A (including sales charge) $13,481 | |||||||||||
| Account Value | $ 13,481 | 11,695 | 11,267 | 12,782 | 11,737 | 11,443 | 10,651 | 10,665 | 10,015 | 9,303 | 9,575 | |
| C000077168 | ||||||||||||
| Account Value [Line Items] | ||||||||||||
| Line Graph and Table Measure Name | Class C (including sales charge) $13,106 | |||||||||||
| Account Value | $ 13,106 | 11,458 | 11,137 | 12,721 | 11,749 | 11,548 | 10,812 | 10,913 | 10,318 | 9,645 | 10,000 | |
| C000077170 | ||||||||||||
| Account Value [Line Items] | ||||||||||||
| Line Graph and Table Measure Name | Class R3 $13,766 | |||||||||||
| Account Value | $ 13,766 | 11,973 | 11,564 | 13,147 | 12,096 | 11,819 | 11,008 | 11,063 | 10,417 | 9,692 | 10,000 | |
| C000125075 | ||||||||||||
| Account Value [Line Items] | ||||||||||||
| Line Graph and Table Measure Name | Class R6 $14,824 | |||||||||||
| Account Value | $ 14,824 | 12,800 | 12,271 | 13,842 | 12,643 | 12,261 | 11,340 | 11,311 | 10,568 | 9,761 | 10,000 | |
| C000228875 | ||||||||||||
| Account Value [Line Items] | ||||||||||||
| Line Graph and Table Measure Name | Class E $14,758 | |||||||||||
| Account Value | $ 14,758 | 12,674 | 12,087 | 13,603 | 12,456 | 12,111 | 11,243 | 11,227 | 10,508 | 9,739 | 10,000 | |
| C000157073 | ||||||||||||
| Account Value [Line Items] | ||||||||||||
| Line Graph and Table Measure Name | Institutional Class $1,309,300 | |||||||||||
| C000157071 | ||||||||||||
| Account Value [Line Items] | ||||||||||||
| Line Graph and Table Measure Name | Class A (including sales charge) $12,104 | |||||||||||
| Account Value | $ 12,104 | 10,493 | 10,444 | 12,588 | 11,716 | 11,706 | 10,726 | 10,595 | 10,401 | 9,793 | $ 9,575 | |
| C000157072 | ||||||||||||
| Account Value [Line Items] | ||||||||||||
| Line Graph and Table Measure Name | Class C (including sales charge) $11,804 | |||||||||||
| Account Value | $ 11,804 | 10,300 | 10,329 | 12,553 | 11,772 | 11,839 | 10,921 | 10,879 | 10,749 | 10,187 | 10,000 | |
| C000121799 | ||||||||||||
| Account Value [Line Items] | ||||||||||||
| Line Graph and Table Measure Name | Institutional Class $1,166,700 | |||||||||||
| C000201844 | ||||||||||||
| Account Value [Line Items] | ||||||||||||
| Line Graph and Table Measure Name | Class A (including sales charge) $10,909 | |||||||||||
| Account Value | $ 10,909 | 10,119 | 10,038 | 11,311 | 11,175 | 10,860 | 10,003 | 10,180 | 10,095 | 9,766 | 9,575 | |
| C000201845 | ||||||||||||
| Account Value [Line Items] | ||||||||||||
| Line Graph and Table Measure Name | Class C (including sales charge) $10,860 | |||||||||||
| Account Value | $ 10,860 | 10,149 | 10,144 | 11,517 | 11,464 | 11,224 | 10,417 | 10,632 | 10,543 | 10,199 | 10,000 | |
| C000021323 | ||||||||||||
| Account Value [Line Items] | ||||||||||||
| Line Graph and Table Measure Name | Investor Class $11,705 | |||||||||||
| Account Value | $ 11,705 | 10,813 | 10,571 | 11,966 | 11,633 | 11,403 | 10,513 | 10,630 | 10,496 | 10,182 | 10,000 | |
| C000089979 | ||||||||||||
| Account Value [Line Items] | ||||||||||||
| Line Graph and Table Measure Name | Institutional Class $1,188,100 | |||||||||||
| C000089977 | ||||||||||||
| Account Value [Line Items] | ||||||||||||
| Line Graph and Table Measure Name | Class A (including sales charge) $10,952 | |||||||||||
| Account Value | $ 10,952 | 10,138 | 9,934 | 11,272 | 10,983 | 10,789 | 9,968 | 10,102 | 10,005 | 9,719 | 9,575 | |
| C000089978 | ||||||||||||
| Account Value [Line Items] | ||||||||||||
| Line Graph and Table Measure Name | Class C (including sales charge) $10,623 | |||||||||||
| Account Value | $ 10,623 | 9,908 | 9,781 | 11,182 | 10,977 | 10,855 | 10,104 | 10,326 | 10,295 | 10,076 | 10,000 | |
| C000021325 | ||||||||||||
| Account Value [Line Items] | ||||||||||||
| Line Graph and Table Measure Name | Investor Class $11,392 | |||||||||||
| Account Value | $ 11,392 | 10,255 | 10,262 | 12,311 | 12,193 | 11,421 | 10,307 | 10,606 | 10,549 | 10,128 | 10,000 | |
| C000021326 | ||||||||||||
| Account Value [Line Items] | ||||||||||||
| Line Graph and Table Measure Name | Institutional Class $1,184,700 | |||||||||||
| C000057304 | ||||||||||||
| Account Value [Line Items] | ||||||||||||
| Line Graph and Table Measure Name | Class A (including sales charge) $10,890 | |||||||||||
| Account Value | $ 10,890 | 9,813 | 9,808 | 11,783 | 11,670 | 10,931 | 9,864 | 10,151 | 10,097 | 9,684 | 9,575 | |
| C000057305 | ||||||||||||
| Account Value [Line Items] | ||||||||||||
| Line Graph and Table Measure Name | Class C (including sales charge) $10,560 | |||||||||||
| Account Value | $ 10,560 | 9,587 | 9,654 | 11,684 | 11,659 | 11,002 | 10,003 | 10,371 | 10,393 | 10,043 | 10,000 | |
| C000153036 | ||||||||||||
| Account Value [Line Items] | ||||||||||||
| Line Graph and Table Measure Name | Class R6 $11,930 | |||||||||||
| Account Value | $ 11,930 | 10,686 | 10,627 | 12,695 | 12,521 | 11,660 | 10,474 | 10,745 | 10,644 | 10,169 | 10,000 | |
| C000044074 | ||||||||||||
| Account Value [Line Items] | ||||||||||||
| Line Graph and Table Measure Name | Trust Class $13,313 | |||||||||||
| Account Value | $ 13,313 | 11,649 | 11,178 | 12,970 | 11,988 | 11,593 | 10,774 | 10,910 | 10,481 | 9,897 | 10,000 | |
| C000021324 | ||||||||||||
| Account Value [Line Items] | ||||||||||||
| Line Graph and Table Measure Name | Institutional Class $1,378,600 | |||||||||||
| C000057302 | ||||||||||||
| Account Value [Line Items] | ||||||||||||
| Line Graph and Table Measure Name | Class A (including sales charge) $12,923 | |||||||||||
| Account Value | $ 12,923 | 11,312 | 10,858 | 12,614 | 11,666 | 11,276 | 10,495 | 10,631 | 10,219 | 9,645 | 9,750 | |
| C000057303 | ||||||||||||
| Account Value [Line Items] | ||||||||||||
| Line Graph and Table Measure Name | Class C (including sales charge) $12,353 | |||||||||||
| Account Value | $ 12,353 | 10,891 | 10,528 | 12,320 | 11,463 | 11,168 | 10,467 | 10,668 | 10,326 | 9,823 | 10,000 | |
| C000125076 | ||||||||||||
| Account Value [Line Items] | ||||||||||||
| Line Graph and Table Measure Name | Class R6 $13,894 | |||||||||||
| Account Value | $ 13,894 | 12,103 | 11,561 | 13,368 | 12,302 | 11,832 | 10,957 | 11,048 | 10,570 | 9,938 | 10,000 | |
| JPM EM Blend HC/LC 50-50 Index | ||||||||||||
| Account Value [Line Items] | ||||||||||||
| Line Graph and Table Measure Name | JPM EM Blend HC/LC 50-50 Index $1,184,500 | |||||||||||
| Account Value | $ 1,184,500 | 1,051,700 | 946,200 | 1,192,900 | 1,159,600 | 1,166,600 | 1,018,900 | 1,070,000 | 1,011,600 | 912,600 | 1,000,000 | |
| JPM EM Blend HC/LC 50-50 Index | ||||||||||||
| Account Value [Line Items] | ||||||||||||
| Line Graph and Table Measure Name | JPM EM Blend HC/LC 50-50 Index $11,845 | |||||||||||
| Account Value | $ 11,845 | 10,517 | 9,462 | 11,929 | 11,596 | 11,666 | 10,189 | 10,700 | 10,116 | 9,126 | 10,000 | |
| JPM EM Blend HC/LC 50-50 Index | ||||||||||||
| Account Value [Line Items] | ||||||||||||
| Line Graph and Table Measure Name | JPM EM Blend HC/LC 50-50 Index $11,845 | |||||||||||
| Account Value | $ 11,845 | 10,517 | 9,462 | 11,929 | 11,596 | 11,666 | 10,189 | 10,700 | 10,116 | 9,126 | 10,000 | |
| Bloomberg U.S. Aggregate Bond Index | ||||||||||||
| Account Value [Line Items] | ||||||||||||
| Line Graph and Table Measure Name | Bloomberg U.S. Aggregate Bond Index $1,159,300 | |||||||||||
| Account Value | $ 1,159,300 | 1,048,700 | 1,045,000 | 1,239,300 | 1,245,300 | 1,172,700 | 1,051,700 | 1,073,700 | 1,064,100 | 1,019,600 | 1,000,000 | |
| Bloomberg U.S. Aggregate Bond Index | ||||||||||||
| Account Value [Line Items] | ||||||||||||
| Line Graph and Table Measure Name | Bloomberg U.S. Aggregate Bond Index $11,593 | |||||||||||
| Account Value | $ 11,593 | 10,487 | 10,450 | 12,393 | 12,453 | 11,727 | 10,517 | 10,737 | 10,641 | 10,196 | 10,000 | |
| Bloomberg U.S. Aggregate Bond Index | ||||||||||||
| Account Value [Line Items] | ||||||||||||
| Line Graph and Table Measure Name | Bloomberg U.S. Aggregate Bond Index $11,593 | |||||||||||
| Account Value | $ 11,593 | 10,487 | 10,450 | 12,393 | 12,453 | 11,727 | 10,517 | 10,737 | 10,641 | 10,196 | 10,000 | |
| Bloomberg U.S. Aggregate Bond Index | ||||||||||||
| Account Value [Line Items] | ||||||||||||
| Line Graph and Table Measure Name | Bloomberg U.S. Aggregate Bond Index $11,593 | |||||||||||
| Account Value | $ 11,593 | 10,487 | 10,450 | 12,393 | 12,453 | 11,727 | 10,517 | 10,737 | 10,641 | 10,196 | 10,000 | |
| Bloomberg U.S. Aggregate Bond Index | ||||||||||||
| Account Value [Line Items] | ||||||||||||
| Line Graph and Table Measure Name | Bloomberg U.S. Aggregate Bond Index $1,159,300 | |||||||||||
| Account Value | $ 1,159,300 | 1,048,700 | 1,045,000 | 1,239,300 | 1,245,300 | 1,172,700 | 1,051,700 | 1,073,700 | 1,064,100 | 1,019,600 | 1,000,000 | |
| Bloomberg U.S. Aggregate Bond Index | ||||||||||||
| Account Value [Line Items] | ||||||||||||
| Line Graph and Table Measure Name | Bloomberg U.S. Aggregate Bond Index $11,593 | |||||||||||
| Account Value | $ 11,593 | 10,487 | 10,450 | 12,393 | 12,453 | 11,727 | 10,517 | 10,737 | 10,641 | 10,196 | 10,000 | |
| Bloomberg U.S. Aggregate Bond Index | ||||||||||||
| Account Value [Line Items] | ||||||||||||
| Line Graph and Table Measure Name | Bloomberg U.S. Aggregate Bond Index $11,593 | |||||||||||
| Account Value | $ 11,593 | 10,487 | 10,450 | 12,393 | 12,453 | 11,727 | 10,517 | 10,737 | 10,641 | 10,196 | 10,000 | |
| Bloomberg U.S. Aggregate Bond Index | ||||||||||||
| Account Value [Line Items] | ||||||||||||
| Line Graph and Table Measure Name | Bloomberg U.S. Aggregate Bond Index $11,593 | |||||||||||
| Account Value | $ 11,593 | 10,487 | 10,450 | 12,393 | 12,453 | 11,727 | 10,517 | 10,737 | 10,641 | 10,196 | 10,000 | |
| Bloomberg U.S. Aggregate Bond Index | ||||||||||||
| Account Value [Line Items] | ||||||||||||
| Line Graph and Table Measure Name | Bloomberg U.S. Aggregate Bond Index $11,593 | |||||||||||
| Account Value | $ 11,593 | 10,487 | 10,450 | 12,393 | 12,453 | 11,727 | 10,517 | 10,737 | 10,641 | 10,196 | 10,000 | |
| Bloomberg U.S. Aggregate Bond Index | ||||||||||||
| Account Value [Line Items] | ||||||||||||
| Line Graph and Table Measure Name | Bloomberg U.S. Aggregate Bond Index $11,593 | |||||||||||
| Account Value | $ 11,593 | 10,487 | 10,450 | 12,393 | 12,453 | 11,727 | 10,517 | 10,737 | 10,641 | 10,196 | 10,000 | |
| Bloomberg Municipal Bond Index | ||||||||||||
| Account Value [Line Items] | ||||||||||||
| Line Graph and Table Measure Name | Bloomberg Municipal Bond Index $1,245,700 | |||||||||||
| Account Value | $ 1,245,700 | 1,135,600 | 1,106,300 | 1,256,900 | 1,224,600 | 1,182,100 | 1,080,400 | 1,085,900 | 1,062,600 | 1,021,200 | 1,000,000 | |
| Bloomberg Municipal Bond Index | ||||||||||||
| Account Value [Line Items] | ||||||||||||
| Line Graph and Table Measure Name | Bloomberg Municipal Bond Index $12,457 | |||||||||||
| Account Value | $ 12,457 | 11,356 | 11,063 | 12,569 | 12,246 | 11,821 | 10,804 | 10,859 | 10,626 | 10,212 | 10,000 | |
| Bloomberg Municipal Bond Index | ||||||||||||
| Account Value [Line Items] | ||||||||||||
| Line Graph and Table Measure Name | Bloomberg Municipal Bond Index $12,457 | |||||||||||
| Account Value | $ 12,457 | 11,356 | 11,063 | 12,569 | 12,246 | 11,821 | 10,804 | 10,859 | 10,626 | 10,212 | 10,000 | |
| Bloomberg Municipal Bond Index | ||||||||||||
| Account Value [Line Items] | ||||||||||||
| Line Graph and Table Measure Name | Bloomberg Municipal Bond Index $1,254,800 | |||||||||||
| Account Value | $ 1,254,800 | 1,143,900 | 1,114,400 | 1,266,100 | 1,233,600 | 1,190,800 | 1,088,300 | 1,093,900 | 1,070,400 | 1,028,700 | 1,000,000 | |
| Bloomberg Municipal Bond Index | ||||||||||||
| Account Value [Line Items] | ||||||||||||
| Line Graph and Table Measure Name | Bloomberg Municipal Bond Index $12,548 | |||||||||||
| Account Value | $ 12,548 | 11,439 | 11,144 | 12,661 | 12,336 | 11,908 | 10,883 | 10,939 | 10,704 | 10,287 | 10,000 | |
| Bloomberg Municipal Bond Index | ||||||||||||
| Account Value [Line Items] | ||||||||||||
| Line Graph and Table Measure Name | Bloomberg Municipal Bond Index $12,548 | |||||||||||
| Account Value | $ 12,548 | 11,439 | 11,144 | 12,661 | 12,336 | 11,908 | 10,883 | 10,939 | 10,704 | 10,287 | 10,000 | |
| Bloomberg Municipal Bond Index | ||||||||||||
| Account Value [Line Items] | ||||||||||||
| Line Graph and Table Measure Name | Bloomberg Municipal Bond Index $12,548 | |||||||||||
| Account Value | $ 12,548 | 11,439 | 11,144 | 12,661 | 12,336 | 11,908 | 10,883 | 10,939 | 10,704 | 10,287 | 10,000 | |
| Bloomberg Municipal Bond Index | ||||||||||||
| Account Value [Line Items] | ||||||||||||
| Line Graph and Table Measure Name | Bloomberg Municipal Bond Index $1,254,800 | |||||||||||
| Account Value | $ 1,254,800 | 1,143,900 | 1,114,400 | 1,266,100 | 1,233,600 | 1,190,800 | 1,088,300 | 1,093,900 | 1,070,400 | 1,028,700 | 1,000,000 | |
| Bloomberg Municipal Bond Index | ||||||||||||
| Account Value [Line Items] | ||||||||||||
| Line Graph and Table Measure Name | Bloomberg Municipal Bond Index $12,548 | |||||||||||
| Account Value | $ 12,548 | 11,439 | 11,144 | 12,661 | 12,336 | 11,908 | 10,883 | 10,939 | 10,704 | 10,287 | 10,000 | |
| Bloomberg Municipal Bond Index | ||||||||||||
| Account Value [Line Items] | ||||||||||||
| Line Graph and Table Measure Name | Bloomberg Municipal Bond Index $12,548 | |||||||||||
| Account Value | $ 12,548 | 11,439 | 11,144 | 12,661 | 12,336 | 11,908 | 10,883 | 10,939 | 10,704 | 10,287 | 10,000 | |
| Bloomberg U.S. Aggregate Bond Index | ||||||||||||
| Account Value [Line Items] | ||||||||||||
| Line Graph and Table Measure Name | Bloomberg U.S. Aggregate Bond Index $11,593 | |||||||||||
| Account Value | $ 11,593 | 10,487 | 10,450 | 12,393 | 12,453 | 11,727 | 10,517 | 10,737 | 10,641 | 10,196 | 10,000 | |
| Bloomberg U.S. Aggregate Bond Index | ||||||||||||
| Account Value [Line Items] | ||||||||||||
| Line Graph and Table Measure Name | Bloomberg U.S. Aggregate Bond Index $1,159,300 | |||||||||||
| Account Value | $ 1,159,300 | 1,048,700 | 1,045,000 | 1,239,300 | 1,245,300 | 1,172,700 | 1,051,700 | 1,073,700 | 1,064,100 | 1,019,600 | 1,000,000 | |
| Bloomberg U.S. Aggregate Bond Index | ||||||||||||
| Account Value [Line Items] | ||||||||||||
| Line Graph and Table Measure Name | Bloomberg U.S. Aggregate Bond Index $11,593 | |||||||||||
| Account Value | $ 11,593 | 10,487 | 10,450 | 12,393 | 12,453 | 11,727 | 10,517 | 10,737 | 10,641 | 10,196 | 10,000 | |
| Bloomberg U.S. Aggregate Bond Index | ||||||||||||
| Account Value [Line Items] | ||||||||||||
| Line Graph and Table Measure Name | Bloomberg U.S. Aggregate Bond Index $11,593 | |||||||||||
| Account Value | $ 11,593 | 10,487 | 10,450 | 12,393 | 12,453 | 11,727 | 10,517 | 10,737 | 10,641 | 10,196 | 10,000 | |
| Bloomberg U.S. Aggregate Bond Index | ||||||||||||
| Account Value [Line Items] | ||||||||||||
| Line Graph and Table Measure Name | Bloomberg U.S. Aggregate Bond Index $11,593 | |||||||||||
| Account Value | $ 11,593 | 10,487 | 10,450 | 12,393 | 12,453 | 11,727 | 10,517 | 10,737 | 10,641 | 10,196 | 10,000 | |
| Bloomberg U.S. Aggregate Bond Index | ||||||||||||
| Account Value [Line Items] | ||||||||||||
| Line Graph and Table Measure Name | Bloomberg U.S. Aggregate Bond Index $11,593 | |||||||||||
| Account Value | $ 11,593 | 10,487 | 10,450 | 12,393 | 12,453 | 11,727 | 10,517 | 10,737 | 10,641 | 10,196 | 10,000 | |
| Bloomberg U.S. Aggregate Bond Index | ||||||||||||
| Account Value [Line Items] | ||||||||||||
| Line Graph and Table Measure Name | Bloomberg U.S. Aggregate Bond Index $1,159,300 | |||||||||||
| Account Value | $ 1,159,300 | 1,048,700 | 1,045,000 | 1,239,300 | 1,245,300 | 1,172,700 | 1,051,700 | 1,073,700 | 1,064,100 | 1,019,600 | 1,000,000 | |
| Bloomberg U.S. Aggregate Bond Index | ||||||||||||
| Account Value [Line Items] | ||||||||||||
| Line Graph and Table Measure Name | Bloomberg U.S. Aggregate Bond Index $11,593 | |||||||||||
| Account Value | $ 11,593 | 10,487 | 10,450 | 12,393 | 12,453 | 11,727 | 10,517 | 10,737 | 10,641 | 10,196 | 10,000 | |
| Bloomberg U.S. Aggregate Bond Index | ||||||||||||
| Account Value [Line Items] | ||||||||||||
| Line Graph and Table Measure Name | Bloomberg U.S. Aggregate Bond Index $11,593 | |||||||||||
| Account Value | $ 11,593 | 10,487 | 10,450 | 12,393 | 12,453 | 11,727 | 10,517 | 10,737 | 10,641 | 10,196 | 10,000 | |
| Bloomberg U.S. Aggregate Bond Index | ||||||||||||
| Account Value [Line Items] | ||||||||||||
| Line Graph and Table Measure Name | Bloomberg U.S. Aggregate Bond Index $11,593 | |||||||||||
| Account Value | $ 11,593 | 10,487 | 10,450 | 12,393 | 12,453 | 11,727 | 10,517 | 10,737 | 10,641 | 10,196 | 10,000 | |
| Nueberger Index: 50% JPM GBI-EM/25% JPM EMBI®/25% JPM CEMBI | ||||||||||||
| Account Value [Line Items] | ||||||||||||
| Line Graph and Table Measure Name | ®</sup>/25% JPM CEMBI $1,181,200" id="sjs-B261">50% JPM GBI-EM/25% JPM EMBI<sup style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 700; grid-area: auto; line-height: 0px; margin: 0px; overflow: visible; position: relative; text-align: center;">®</sup>/25% JPM CEMBI $1,181,200 | |||||||||||
| Account Value | $ 1,181,200 | 1,049,100 | 944,700 | 1,194,100 | 1,162,400 | 1,168,500 | 1,019,200 | 1,070,900 | 1,012,600 | 912,400 | 1,000,000 | |
| Nueberger Index: 50% JPM GBI-EM/25% JPM EMBI®/25% JPM CEMBI | ||||||||||||
| Account Value [Line Items] | ||||||||||||
| Line Graph and Table Measure Name | ®</sup>/25% JPM CEMBI $11,812" id="sjs-B265">50% JPM GBI-EM/25% JPM EMBI<sup style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 700; grid-area: auto; line-height: 0px; margin: 0px; overflow: visible; position: relative; text-align: center;">®</sup>/25% JPM CEMBI $11,812 | |||||||||||
| Account Value | $ 11,812 | 10,491 | 9,447 | 11,941 | 11,624 | 11,685 | 10,192 | 10,709 | 10,126 | 9,124 | 10,000 | |
| Nueberger Index: 50% JPM GBI-EM/25% JPM EMBI®/25% JPM CEMBI | ||||||||||||
| Account Value [Line Items] | ||||||||||||
| Line Graph and Table Measure Name | ®</sup>/25% JPM CEMBI $11,812" id="sjs-B269">50% JPM GBI-EM/25% JPM EMBI<sup style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 700; grid-area: auto; line-height: 0px; margin: 0px; overflow: visible; position: relative; text-align: center;">®</sup>/25% JPM CEMBI $11,812 | |||||||||||
| Account Value | $ 11,812 | 10,491 | 9,447 | 11,941 | 11,624 | 11,685 | 10,192 | 10,709 | 10,126 | 9,124 | 10,000 | |
| Morningstar LSTA U.S. Leveraged Loan Index | ||||||||||||
| Account Value [Line Items] | ||||||||||||
| Line Graph and Table Measure Name | Morningstar LSTA U.S. Leveraged Loan Index $1,616,900 | |||||||||||
| Account Value | $ 1,616,900 | 1,462,500 | 1,306,800 | 1,331,800 | 1,227,800 | 1,207,000 | 1,175,600 | 1,124,600 | 1,070,400 | 1,004,800 | 1,000,000 | |
| Morningstar LSTA U.S. Leveraged Loan Index | ||||||||||||
| Account Value [Line Items] | ||||||||||||
| Line Graph and Table Measure Name | Morningstar LSTA U.S. Leveraged Loan Index $16,169 | |||||||||||
| Account Value | $ 16,169 | 14,625 | 13,068 | 13,318 | 12,278 | 12,070 | 11,756 | 11,246 | 10,704 | 10,048 | 10,000 | |
| Morningstar LSTA U.S. Leveraged Loan Index | ||||||||||||
| Account Value [Line Items] | ||||||||||||
| Line Graph and Table Measure Name | Morningstar LSTA U.S. Leveraged Loan Index $16,169 | |||||||||||
| Account Value | $ 16,169 | 14,625 | 13,068 | 13,318 | 12,278 | 12,070 | 11,756 | 11,246 | 10,704 | 10,048 | 10,000 | |
| Neuberger Index: ICE BofA U.S. High Yield Constrained Index | ||||||||||||
| Account Value [Line Items] | ||||||||||||
| Line Graph and Table Measure Name | ICE BofA U.S. High Yield Constrained Index $15,939 | |||||||||||
| Account Value | $ 15,939 | 13,683 | 12,932 | 14,604 | 13,187 | 12,872 | 11,883 | 11,781 | 10,795 | 9,797 | 10,000 | |
| Neuberger Index: ICE BofA U.S. High Yield Constrained Index | ||||||||||||
| Account Value [Line Items] | ||||||||||||
| Line Graph and Table Measure Name | ICE BofA U.S. High Yield Constrained Index $1,593,900 | |||||||||||
| Account Value | $ 1,593,900 | 1,368,300 | 1,293,200 | 1,460,400 | 1,318,700 | 1,287,200 | 1,188,300 | 1,178,100 | 1,079,500 | 979,700 | 1,000,000 | |
| Neuberger Index: ICE BofA U.S. High Yield Constrained Index | ||||||||||||
| Account Value [Line Items] | ||||||||||||
| Line Graph and Table Measure Name | ICE BofA U.S. High Yield Constrained Index $15,939 | |||||||||||
| Account Value | $ 15,939 | 13,683 | 12,932 | 14,604 | 13,187 | 12,872 | 11,883 | 11,781 | 10,795 | 9,797 | 10,000 | |
| Neuberger Index: ICE BofA U.S. High Yield Constrained Index | ||||||||||||
| Account Value [Line Items] | ||||||||||||
| Line Graph and Table Measure Name | ICE BofA U.S. High Yield Constrained Index $15,939 | |||||||||||
| Account Value | $ 15,939 | 13,683 | 12,932 | 14,604 | 13,187 | 12,872 | 11,883 | 11,781 | 10,795 | 9,797 | 10,000 | |
| Neuberger Index: ICE BofA U.S. High Yield Constrained Index | ||||||||||||
| Account Value [Line Items] | ||||||||||||
| Line Graph and Table Measure Name | ICE BofA U.S. High Yield Constrained Index $15,939 | |||||||||||
| Account Value | $ 15,939 | 13,683 | 12,932 | 14,604 | 13,187 | 12,872 | 11,883 | 11,781 | 10,795 | 9,797 | 10,000 | |
| Neuberger Index: ICE BofA U.S. High Yield Constrained Index | ||||||||||||
| Account Value [Line Items] | ||||||||||||
| Line Graph and Table Measure Name | ICE BofA U.S. High Yield Constrained Index $15,939 | |||||||||||
| Account Value | $ 15,939 | 13,683 | 12,932 | 14,604 | 13,187 | 12,872 | 11,883 | 11,781 | 10,795 | 9,797 | 10,000 | |
| Neuberger Index: ICE BofA U.S. High Yield Constrained Index | ||||||||||||
| Account Value [Line Items] | ||||||||||||
| Line Graph and Table Measure Name | ICE BofA U.S. High Yield Constrained Index $15,939 | |||||||||||
| Account Value | $ 15,939 | 13,683 | 12,932 | 14,604 | 13,187 | 12,872 | 11,883 | 11,781 | 10,795 | 9,797 | 10,000 | |
| Neuberger Index: 65% Bloomberg Municipal Bond Index and 35% | ||||||||||||
| Account Value [Line Items] | ||||||||||||
| Line Graph and Table Measure Name | 65% Bloomberg Municipal Bond Index and 35% Bloomberg Municipal High Yield Index $1,330,500 | |||||||||||
| Account Value | $ 1,330,500 | 1,184,100 | 1,148,400 | 1,328,500 | 1,260,600 | 1,225,600 | 1,112,200 | 1,097,900 | 1,071,300 | 1,014,100 | 1,000,000 | |
| Neuberger Index: 65% Bloomberg Municipal Bond Index and 35% | ||||||||||||
| Account Value [Line Items] | ||||||||||||
| Line Graph and Table Measure Name | 65% Bloomberg Municipal Bond Index and 35% Bloomberg Municipal High Yield Index $13,305 | |||||||||||
| Account Value | $ 13,305 | 11,841 | 11,484 | 13,285 | 12,606 | 12,256 | 11,122 | 10,979 | 10,713 | 10,141 | 10,000 | |
| Neuberger Index: 65% Bloomberg Municipal Bond Index and 35% | ||||||||||||
| Account Value [Line Items] | ||||||||||||
| Line Graph and Table Measure Name | 65% Bloomberg Municipal Bond Index and 35% Bloomberg Municipal High Yield Index $13,305 | |||||||||||
| Account Value | $ 13,305 | 11,841 | 11,484 | 13,285 | 12,606 | 12,256 | 11,122 | 10,979 | 10,713 | 10,141 | $ 10,000 | |
| Bloomberg 7-Year G.O. Index | ||||||||||||
| Account Value [Line Items] | ||||||||||||
| Line Graph and Table Measure Name | Bloomberg 7-Year G.O. Index $12,068 | |||||||||||
| Account Value | $ 12,068 | 11,336 | 11,128 | 12,180 | 12,052 | 11,537 | 10,620 | 10,734 | 10,575 | 10,263 | 10,000 | |
| Bloomberg 7-Year G.O. Index | ||||||||||||
| Account Value [Line Items] | ||||||||||||
| Line Graph and Table Measure Name | Bloomberg 7-Year G.O. Index $1,206,800 | |||||||||||
| Account Value | $ 1,206,800 | 1,133,600 | 1,112,800 | 1,218,000 | 1,205,200 | 1,153,700 | 1,062,000 | 1,073,400 | 1,057,500 | 1,026,300 | 1,000,000 | |
| Bloomberg 7-Year G.O. Index | ||||||||||||
| Account Value [Line Items] | ||||||||||||
| Line Graph and Table Measure Name | Bloomberg 7-Year G.O. Index $12,068 | |||||||||||
| Account Value | $ 12,068 | 11,336 | 11,128 | 12,180 | 12,052 | 11,537 | 10,620 | 10,734 | 10,575 | 10,263 | 10,000 | |
| Bloomberg 7-Year G.O. Index | ||||||||||||
| Account Value [Line Items] | ||||||||||||
| Line Graph and Table Measure Name | Bloomberg 7-Year G.O. Index $12,068 | |||||||||||
| Account Value | $ 12,068 | $ 11,336 | $ 11,128 | $ 12,180 | $ 12,052 | $ 11,537 | $ 10,620 | $ 10,734 | $ 10,575 | $ 10,263 | $ 10,000 |
| Shareholder Report, Average Annual Return (Details) | 12 Months Ended | 60 Months Ended | 112 Months Ended | 120 Months Ended |
| Oct. 31, 2024 | Oct. 31, 2024 | Oct. 31, 2024 | Oct. 31, 2024 | |
| C000129449 | ||||
| Average Annual Return [Line Items] | ||||
| Line Graph and Table Measure Name | Institutional Class $1,165,400 | |||
| C000129447 | ||||
| Average Annual Return [Line Items] | ||||
| Line Graph and Table Measure Name | Class A (including sales charge) $10,728 | |||
| Average Annual Return, Percent | 8.50% | (0.78%) | 0.71% | |
| C000129448 | ||||
| Average Annual Return [Line Items] | ||||
| Line Graph and Table Measure Name | Class C (including sales charge) $10,406 | |||
| Average Annual Return, Percent | 11.50% | (0.64%) | 0.40% | |
| C000082160 | ||||
| Average Annual Return [Line Items] | ||||
| Line Graph and Table Measure Name | Institutional Class $1,558,100 | |||
| C000082158 | ||||
| Average Annual Return [Line Items] | ||||
| Line Graph and Table Measure Name | Class A (including sales charge) $14,376 | |||
| Average Annual Return, Percent | 5.75% | 4.66% | 3.70% | |
| C000082159 | ||||
| Average Annual Return [Line Items] | ||||
| Line Graph and Table Measure Name | Class C (including sales charge) $13,918 | |||
| Average Annual Return, Percent | 8.49% | 4.75% | 3.36% | |
| C000021322 | ||||
| Average Annual Return [Line Items] | ||||
| Line Graph and Table Measure Name | Investor Class $14,449 | |||
| C000064460 | ||||
| Average Annual Return [Line Items] | ||||
| Line Graph and Table Measure Name | Institutional Class $1,467,300 | |||
| C000077167 | ||||
| Average Annual Return [Line Items] | ||||
| Line Graph and Table Measure Name | Class A (including sales charge) $13,481 | |||
| Average Annual Return, Percent | 10.45% | 2.43% | 3.03% | |
| C000077168 | ||||
| Average Annual Return [Line Items] | ||||
| Line Graph and Table Measure Name | Class C (including sales charge) $13,106 | |||
| Average Annual Return, Percent | 13.39% | 2.56% | 2.74% | |
| C000077170 | ||||
| Average Annual Return [Line Items] | ||||
| Line Graph and Table Measure Name | Class R3 $13,766 | |||
| C000125075 | ||||
| Average Annual Return [Line Items] | ||||
| Line Graph and Table Measure Name | Class R6 $14,824 | |||
| C000228875 | ||||
| Average Annual Return [Line Items] | ||||
| Line Graph and Table Measure Name | Class E $14,758 | |||
| C000157073 | ||||
| Average Annual Return [Line Items] | ||||
| Line Graph and Table Measure Name | Institutional Class $1,309,300 | |||
| C000157071 | ||||
| Average Annual Return [Line Items] | ||||
| Line Graph and Table Measure Name | Class A (including sales charge) $12,104 | |||
| Average Annual Return, Percent | 10.41% | (0.20%) | 2.06% | |
| C000157072 | ||||
| Average Annual Return [Line Items] | ||||
| Line Graph and Table Measure Name | Class C (including sales charge) $11,804 | |||
| Average Annual Return, Percent | 13.61% | (0.06%) | 1.79% | |
| C000121799 | ||||
| Average Annual Return [Line Items] | ||||
| Line Graph and Table Measure Name | Institutional Class $1,166,700 | |||
| C000201844 | ||||
| Average Annual Return [Line Items] | ||||
| Line Graph and Table Measure Name | Class A (including sales charge) $10,909 | |||
| Average Annual Return, Percent | 3.23% | (0.77%) | 0.87% | |
| C000201845 | ||||
| Average Annual Return [Line Items] | ||||
| Line Graph and Table Measure Name | Class C (including sales charge) $10,860 | |||
| Average Annual Return, Percent | 6% | (0.66%) | 0.83% | |
| C000021323 | ||||
| Average Annual Return [Line Items] | ||||
| Line Graph and Table Measure Name | Investor Class $11,705 | |||
| C000089979 | ||||
| Average Annual Return [Line Items] | ||||
| Line Graph and Table Measure Name | Institutional Class $1,188,100 | |||
| C000089977 | ||||
| Average Annual Return [Line Items] | ||||
| Line Graph and Table Measure Name | Class A (including sales charge) $10,952 | |||
| Average Annual Return, Percent | 3.44% | (0.56%) | 0.91% | |
| C000089978 | ||||
| Average Annual Return [Line Items] | ||||
| Line Graph and Table Measure Name | Class C (including sales charge) $10,623 | |||
| Average Annual Return, Percent | 6.22% | (0.43%) | 0.61% | |
| C000021325 | ||||
| Average Annual Return [Line Items] | ||||
| Line Graph and Table Measure Name | Investor Class $11,392 | |||
| C000021326 | ||||
| Average Annual Return [Line Items] | ||||
| Line Graph and Table Measure Name | Institutional Class $1,184,700 | |||
| C000057304 | ||||
| Average Annual Return [Line Items] | ||||
| Line Graph and Table Measure Name | Class A (including sales charge) $10,890 | |||
| Average Annual Return, Percent | 6.22% | (0.95%) | 0.86% | |
| C000057305 | ||||
| Average Annual Return [Line Items] | ||||
| Line Graph and Table Measure Name | Class C (including sales charge) $10,560 | |||
| Average Annual Return, Percent | 9.14% | (0.82%) | 0.55% | |
| C000153036 | ||||
| Average Annual Return [Line Items] | ||||
| Line Graph and Table Measure Name | Class R6 $11,930 | |||
| C000044074 | ||||
| Average Annual Return [Line Items] | ||||
| Line Graph and Table Measure Name | Trust Class $13,313 | |||
| C000021324 | ||||
| Average Annual Return [Line Items] | ||||
| Line Graph and Table Measure Name | Institutional Class $1,378,600 | |||
| C000057302 | ||||
| Average Annual Return [Line Items] | ||||
| Line Graph and Table Measure Name | Class A (including sales charge) $12,923 | |||
| Average Annual Return, Percent | 11.43% | 2.25% | 2.60% | |
| C000057303 | ||||
| Average Annual Return [Line Items] | ||||
| Line Graph and Table Measure Name | Class C (including sales charge) $12,353 | |||
| Average Annual Return, Percent | 12.43% | 2.04% | 2.14% | |
| C000125076 | ||||
| Average Annual Return [Line Items] | ||||
| Line Graph and Table Measure Name | Class R6 $13,894 | |||
| Without Sales Load [Member] | C000129449 | ||||
| Average Annual Return [Line Items] | ||||
| Average Annual Return, Percent | 13.92% | 0.48% | 1.54% | |
| Without Sales Load [Member] | C000129447 | ||||
| Average Annual Return [Line Items] | ||||
| Average Annual Return, Percent | 13.24% | 0.08% | 1.14% | |
| Without Sales Load [Member] | C000129448 | ||||
| Average Annual Return [Line Items] | ||||
| Average Annual Return, Percent | 12.50% | (0.64%) | 0.40% | |
| Without Sales Load [Member] | C000082160 | ||||
| Average Annual Return [Line Items] | ||||
| Average Annual Return, Percent | 10.83% | 5.95% | 4.53% | |
| Without Sales Load [Member] | C000082158 | ||||
| Average Annual Return [Line Items] | ||||
| Average Annual Return, Percent | 10.42% | 5.56% | 4.15% | |
| Without Sales Load [Member] | C000082159 | ||||
| Average Annual Return [Line Items] | ||||
| Average Annual Return, Percent | 9.49% | 4.75% | 3.36% | |
| Without Sales Load [Member] | C000021322 | ||||
| Average Annual Return [Line Items] | ||||
| Average Annual Return, Percent | 15.52% | 3.59% | 3.75% | |
| Without Sales Load [Member] | C000064460 | ||||
| Average Annual Return [Line Items] | ||||
| Average Annual Return, Percent | 15.71% | 3.76% | 3.91% | |
| Without Sales Load [Member] | C000077167 | ||||
| Average Annual Return [Line Items] | ||||
| Average Annual Return, Percent | 15.28% | 3.33% | 3.48% | |
| Without Sales Load [Member] | C000077168 | ||||
| Average Annual Return [Line Items] | ||||
| Average Annual Return, Percent | 14.39% | 2.56% | 2.74% | |
| Without Sales Load [Member] | C000077170 | ||||
| Average Annual Return [Line Items] | ||||
| Average Annual Return, Percent | 14.97% | 3.10% | 3.25% | |
| Without Sales Load [Member] | C000125075 | ||||
| Average Annual Return [Line Items] | ||||
| Average Annual Return, Percent | 15.81% | 3.87% | 4.01% | |
| Without Sales Load [Member] | C000228875 | ||||
| Average Annual Return [Line Items] | ||||
| Average Annual Return, Percent | 16.44% | 4.03% | 3.97% | |
| Without Sales Load [Member] | C000157073 | ||||
| Average Annual Return [Line Items] | ||||
| Average Annual Return, Percent | 15.90% | 1.05% | 2.92% | |
| Without Sales Load [Member] | C000157071 | ||||
| Average Annual Return [Line Items] | ||||
| Average Annual Return, Percent | 15.36% | 0.67% | 2.53% | |
| Without Sales Load [Member] | C000157072 | ||||
| Average Annual Return [Line Items] | ||||
| Average Annual Return, Percent | 14.61% | (0.06%) | 1.79% | |
| Without Sales Load [Member] | C000121799 | ||||
| Average Annual Return [Line Items] | ||||
| Average Annual Return, Percent | 8.27% | 0.47% | 1.55% | |
| Without Sales Load [Member] | C000201844 | ||||
| Average Annual Return [Line Items] | ||||
| Average Annual Return, Percent | 7.80% | 0.09% | 1.31% | |
| Without Sales Load [Member] | C000201845 | ||||
| Average Annual Return [Line Items] | ||||
| Average Annual Return, Percent | 7% | (0.66%) | 0.83% | |
| Without Sales Load [Member] | C000021323 | ||||
| Average Annual Return [Line Items] | ||||
| Average Annual Return, Percent | 8.25% | 0.52% | 1.59% | |
| Without Sales Load [Member] | C000089979 | ||||
| Average Annual Return [Line Items] | ||||
| Average Annual Return, Percent | 8.42% | 0.67% | 1.74% | |
| Without Sales Load [Member] | C000089977 | ||||
| Average Annual Return [Line Items] | ||||
| Average Annual Return, Percent | 8.02% | 0.30% | 1.35% | |
| Without Sales Load [Member] | C000089978 | ||||
| Average Annual Return [Line Items] | ||||
| Average Annual Return, Percent | 7.22% | (0.43%) | 0.61% | |
| Without Sales Load [Member] | C000021325 | ||||
| Average Annual Return [Line Items] | ||||
| Average Annual Return, Percent | 11.09% | (0.05%) | 1.31% | |
| Without Sales Load [Member] | C000021326 | ||||
| Average Annual Return [Line Items] | ||||
| Average Annual Return, Percent | 11.40% | 0.33% | 1.71% | |
| Without Sales Load [Member] | C000057304 | ||||
| Average Annual Return [Line Items] | ||||
| Average Annual Return, Percent | 10.98% | (0.08%) | 1.30% | |
| Without Sales Load [Member] | C000057305 | ||||
| Average Annual Return [Line Items] | ||||
| Average Annual Return, Percent | 10.14% | (0.82%) | 0.55% | |
| Without Sales Load [Member] | C000153036 | ||||
| Average Annual Return [Line Items] | ||||
| Average Annual Return, Percent | 11.63% | 0.46% | 1.78% | |
| Without Sales Load [Member] | C000044074 | ||||
| Average Annual Return [Line Items] | ||||
| Average Annual Return, Percent | 14.28% | 2.81% | 2.90% | |
| Without Sales Load [Member] | C000021324 | ||||
| Average Annual Return [Line Items] | ||||
| Average Annual Return, Percent | 14.68% | 3.16% | 3.26% | |
| Without Sales Load [Member] | C000057302 | ||||
| Average Annual Return [Line Items] | ||||
| Average Annual Return, Percent | 14.24% | 2.76% | 2.86% | |
| Without Sales Load [Member] | C000057303 | ||||
| Average Annual Return [Line Items] | ||||
| Average Annual Return, Percent | 13.43% | 2.04% | 2.14% | |
| Without Sales Load [Member] | C000125076 | ||||
| Average Annual Return [Line Items] | ||||
| Average Annual Return, Percent | 14.80% | 3.27% | 3.34% | |
| JPM EM Blend HC/LC 50-50 Index | ||||
| Average Annual Return [Line Items] | ||||
| Line Graph and Table Measure Name | JPM EM Blend HC/LC 50-50 Index $1,184,500 | |||
| Average Annual Return, Percent | 12.62% | 0.30% | 1.71% | |
| JPM EM Blend HC/LC 50-50 Index | ||||
| Average Annual Return [Line Items] | ||||
| Line Graph and Table Measure Name | JPM EM Blend HC/LC 50-50 Index $11,845 | |||
| Average Annual Return, Percent | 12.62% | 0.30% | 1.71% | |
| JPM EM Blend HC/LC 50-50 Index | ||||
| Average Annual Return [Line Items] | ||||
| Line Graph and Table Measure Name | JPM EM Blend HC/LC 50-50 Index $11,845 | |||
| Average Annual Return, Percent | 12.62% | 0.30% | 1.71% | |
| Bloomberg U.S. Aggregate Bond Index | ||||
| Average Annual Return [Line Items] | ||||
| Line Graph and Table Measure Name | Bloomberg U.S. Aggregate Bond Index $1,159,300 | |||
| Average Annual Return, Percent | 10.55% | (0.23%) | 1.49% | |
| Bloomberg U.S. Aggregate Bond Index | ||||
| Average Annual Return [Line Items] | ||||
| Line Graph and Table Measure Name | Bloomberg U.S. Aggregate Bond Index $11,593 | |||
| Average Annual Return, Percent | 10.55% | (0.23%) | 1.49% | |
| Bloomberg U.S. Aggregate Bond Index | ||||
| Average Annual Return [Line Items] | ||||
| Line Graph and Table Measure Name | Bloomberg U.S. Aggregate Bond Index $11,593 | |||
| Average Annual Return, Percent | 10.55% | (0.23%) | 1.49% | |
| Bloomberg U.S. Aggregate Bond Index | ||||
| Average Annual Return [Line Items] | ||||
| Line Graph and Table Measure Name | Bloomberg U.S. Aggregate Bond Index $11,593 | |||
| Average Annual Return, Percent | 10.55% | (0.23%) | 1.49% | |
| Bloomberg U.S. Aggregate Bond Index | ||||
| Average Annual Return [Line Items] | ||||
| Line Graph and Table Measure Name | Bloomberg U.S. Aggregate Bond Index $1,159,300 | |||
| Average Annual Return, Percent | 10.55% | (0.23%) | 1.49% | |
| Bloomberg U.S. Aggregate Bond Index | ||||
| Average Annual Return [Line Items] | ||||
| Line Graph and Table Measure Name | Bloomberg U.S. Aggregate Bond Index $11,593 | |||
| Average Annual Return, Percent | 10.55% | (0.23%) | 1.49% | |
| Bloomberg U.S. Aggregate Bond Index | ||||
| Average Annual Return [Line Items] | ||||
| Line Graph and Table Measure Name | Bloomberg U.S. Aggregate Bond Index $11,593 | |||
| Average Annual Return, Percent | 10.55% | (0.23%) | 1.49% | |
| Bloomberg U.S. Aggregate Bond Index | ||||
| Average Annual Return [Line Items] | ||||
| Line Graph and Table Measure Name | Bloomberg U.S. Aggregate Bond Index $11,593 | |||
| Average Annual Return, Percent | 10.55% | (0.23%) | 1.49% | |
| Bloomberg U.S. Aggregate Bond Index | ||||
| Average Annual Return [Line Items] | ||||
| Line Graph and Table Measure Name | Bloomberg U.S. Aggregate Bond Index $11,593 | |||
| Average Annual Return, Percent | 10.55% | (0.23%) | 1.49% | |
| Bloomberg U.S. Aggregate Bond Index | ||||
| Average Annual Return [Line Items] | ||||
| Line Graph and Table Measure Name | Bloomberg U.S. Aggregate Bond Index $11,593 | |||
| Average Annual Return, Percent | 10.55% | (0.23%) | 1.49% | |
| Bloomberg Municipal Bond Index | ||||
| Average Annual Return [Line Items] | ||||
| Line Graph and Table Measure Name | Bloomberg Municipal Bond Index $1,245,700 | |||
| Average Annual Return, Percent | 9.70% | 1.05% | 2.37% | |
| Bloomberg Municipal Bond Index | ||||
| Average Annual Return [Line Items] | ||||
| Line Graph and Table Measure Name | Bloomberg Municipal Bond Index $12,457 | |||
| Average Annual Return, Percent | 9.70% | 1.05% | 2.37% | |
| Bloomberg Municipal Bond Index | ||||
| Average Annual Return [Line Items] | ||||
| Line Graph and Table Measure Name | Bloomberg Municipal Bond Index $12,457 | |||
| Average Annual Return, Percent | 9.70% | 1.05% | 2.37% | |
| Bloomberg Municipal Bond Index | ||||
| Average Annual Return [Line Items] | ||||
| Line Graph and Table Measure Name | Bloomberg Municipal Bond Index $1,254,800 | |||
| Average Annual Return, Percent | 9.70% | 1.05% | 2.30% | |
| Bloomberg Municipal Bond Index | ||||
| Average Annual Return [Line Items] | ||||
| Line Graph and Table Measure Name | Bloomberg Municipal Bond Index $12,548 | |||
| Average Annual Return, Percent | 9.70% | 1.05% | 2.30% | |
| Bloomberg Municipal Bond Index | ||||
| Average Annual Return [Line Items] | ||||
| Line Graph and Table Measure Name | Bloomberg Municipal Bond Index $12,548 | |||
| Average Annual Return, Percent | 9.70% | 1.05% | 2.30% | |
| Bloomberg Municipal Bond Index | ||||
| Average Annual Return [Line Items] | ||||
| Line Graph and Table Measure Name | Bloomberg Municipal Bond Index $12,548 | |||
| Average Annual Return, Percent | 9.70% | 1.05% | 2.30% | |
| Bloomberg Municipal Bond Index | ||||
| Average Annual Return [Line Items] | ||||
| Line Graph and Table Measure Name | Bloomberg Municipal Bond Index $1,254,800 | |||
| Average Annual Return, Percent | 9.70% | 1.05% | 2.30% | |
| Bloomberg Municipal Bond Index | ||||
| Average Annual Return [Line Items] | ||||
| Line Graph and Table Measure Name | Bloomberg Municipal Bond Index $12,548 | |||
| Average Annual Return, Percent | 9.70% | 1.05% | 2.30% | |
| Bloomberg Municipal Bond Index | ||||
| Average Annual Return [Line Items] | ||||
| Line Graph and Table Measure Name | Bloomberg Municipal Bond Index $12,548 | |||
| Average Annual Return, Percent | 9.70% | 1.05% | 2.30% | |
| Bloomberg U.S. Aggregate Bond Index | ||||
| Average Annual Return [Line Items] | ||||
| Line Graph and Table Measure Name | Bloomberg U.S. Aggregate Bond Index $11,593 | |||
| Average Annual Return, Percent | 10.55% | (0.23%) | 1.49% | |
| Bloomberg U.S. Aggregate Bond Index | ||||
| Average Annual Return [Line Items] | ||||
| Line Graph and Table Measure Name | Bloomberg U.S. Aggregate Bond Index $1,159,300 | |||
| Average Annual Return, Percent | 10.55% | (0.23%) | 1.49% | |
| Bloomberg U.S. Aggregate Bond Index | ||||
| Average Annual Return [Line Items] | ||||
| Line Graph and Table Measure Name | Bloomberg U.S. Aggregate Bond Index $11,593 | |||
| Average Annual Return, Percent | 10.55% | (0.23%) | 1.49% | |
| Bloomberg U.S. Aggregate Bond Index | ||||
| Average Annual Return [Line Items] | ||||
| Line Graph and Table Measure Name | Bloomberg U.S. Aggregate Bond Index $11,593 | |||
| Average Annual Return, Percent | 10.55% | (0.23%) | 1.49% | |
| Bloomberg U.S. Aggregate Bond Index | ||||
| Average Annual Return [Line Items] | ||||
| Line Graph and Table Measure Name | Bloomberg U.S. Aggregate Bond Index $11,593 | |||
| Average Annual Return, Percent | 10.55% | (0.23%) | 1.49% | |
| Bloomberg U.S. Aggregate Bond Index | ||||
| Average Annual Return [Line Items] | ||||
| Line Graph and Table Measure Name | Bloomberg U.S. Aggregate Bond Index $11,593 | |||
| Average Annual Return, Percent | 10.55% | (0.23%) | 1.49% | |
| Bloomberg U.S. Aggregate Bond Index | ||||
| Average Annual Return [Line Items] | ||||
| Line Graph and Table Measure Name | Bloomberg U.S. Aggregate Bond Index $1,159,300 | |||
| Average Annual Return, Percent | 10.55% | (0.23%) | 1.49% | |
| Bloomberg U.S. Aggregate Bond Index | ||||
| Average Annual Return [Line Items] | ||||
| Line Graph and Table Measure Name | Bloomberg U.S. Aggregate Bond Index $11,593 | |||
| Average Annual Return, Percent | 10.55% | (0.23%) | 1.49% | |
| Bloomberg U.S. Aggregate Bond Index | ||||
| Average Annual Return [Line Items] | ||||
| Line Graph and Table Measure Name | Bloomberg U.S. Aggregate Bond Index $11,593 | |||
| Average Annual Return, Percent | 10.55% | (0.23%) | 1.49% | |
| Bloomberg U.S. Aggregate Bond Index | ||||
| Average Annual Return [Line Items] | ||||
| Line Graph and Table Measure Name | Bloomberg U.S. Aggregate Bond Index $11,593 | |||
| Average Annual Return, Percent | 10.55% | (0.23%) | 1.49% | |
| Nueberger Index: 50% JPM GBI-EM/25% JPM EMBI®/25% JPM CEMBI | ||||
| Average Annual Return [Line Items] | ||||
| Line Graph and Table Measure Name | ®</sup>/25% JPM CEMBI $1,181,200" id="sjs-B351">50% JPM GBI-EM/25% JPM EMBI<sup style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 700; grid-area: auto; line-height: 0px; margin: 0px; overflow: visible; position: relative; text-align: center;">®</sup>/25% JPM CEMBI $1,181,200 | |||
| Average Annual Return, Percent | 12.59% | 0.22% | 1.68% | |
| Nueberger Index: 50% JPM GBI-EM/25% JPM EMBI®/25% JPM CEMBI | ||||
| Average Annual Return [Line Items] | ||||
| Line Graph and Table Measure Name | ®</sup>/25% JPM CEMBI $11,812" id="sjs-B355">50% JPM GBI-EM/25% JPM EMBI<sup style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 700; grid-area: auto; line-height: 0px; margin: 0px; overflow: visible; position: relative; text-align: center;">®</sup>/25% JPM CEMBI $11,812 | |||
| Average Annual Return, Percent | 12.59% | 0.22% | 1.68% | |
| Nueberger Index: 50% JPM GBI-EM/25% JPM EMBI®/25% JPM CEMBI | ||||
| Average Annual Return [Line Items] | ||||
| Line Graph and Table Measure Name | ®</sup>/25% JPM CEMBI $11,812" id="sjs-B359">50% JPM GBI-EM/25% JPM EMBI<sup style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 700; grid-area: auto; line-height: 0px; margin: 0px; overflow: visible; position: relative; text-align: center;">®</sup>/25% JPM CEMBI $11,812 | |||
| Average Annual Return, Percent | 12.59% | 0.22% | 1.68% | |
| Morningstar LSTA U.S. Leveraged Loan Index | ||||
| Average Annual Return [Line Items] | ||||
| Line Graph and Table Measure Name | Morningstar LSTA U.S. Leveraged Loan Index $1,616,900 | |||
| Average Annual Return, Percent | 10.56% | 6.02% | 4.92% | |
| Morningstar LSTA U.S. Leveraged Loan Index | ||||
| Average Annual Return [Line Items] | ||||
| Line Graph and Table Measure Name | Morningstar LSTA U.S. Leveraged Loan Index $16,169 | |||
| Average Annual Return, Percent | 10.56% | 6.02% | 4.92% | |
| Morningstar LSTA U.S. Leveraged Loan Index | ||||
| Average Annual Return [Line Items] | ||||
| Line Graph and Table Measure Name | Morningstar LSTA U.S. Leveraged Loan Index $16,169 | |||
| Average Annual Return, Percent | 10.56% | 6.02% | 4.92% | |
| Neuberger Index: ICE BofA U.S. High Yield Constrained Index | ||||
| Average Annual Return [Line Items] | ||||
| Line Graph and Table Measure Name | ICE BofA U.S. High Yield Constrained Index $15,939 | |||
| Average Annual Return, Percent | 16.49% | 4.37% | 4.77% | |
| Neuberger Index: ICE BofA U.S. High Yield Constrained Index | ||||
| Average Annual Return [Line Items] | ||||
| Line Graph and Table Measure Name | ICE BofA U.S. High Yield Constrained Index $1,593,900 | |||
| Average Annual Return, Percent | 16.49% | 4.37% | 4.77% | |
| Neuberger Index: ICE BofA U.S. High Yield Constrained Index | ||||
| Average Annual Return [Line Items] | ||||
| Line Graph and Table Measure Name | ICE BofA U.S. High Yield Constrained Index $15,939 | |||
| Average Annual Return, Percent | 16.49% | 4.37% | 4.77% | |
| Neuberger Index: ICE BofA U.S. High Yield Constrained Index | ||||
| Average Annual Return [Line Items] | ||||
| Line Graph and Table Measure Name | ICE BofA U.S. High Yield Constrained Index $15,939 | |||
| Average Annual Return, Percent | 16.49% | 4.37% | 4.77% | |
| Neuberger Index: ICE BofA U.S. High Yield Constrained Index | ||||
| Average Annual Return [Line Items] | ||||
| Line Graph and Table Measure Name | ICE BofA U.S. High Yield Constrained Index $15,939 | |||
| Average Annual Return, Percent | 16.49% | 4.37% | 4.77% | |
| Neuberger Index: ICE BofA U.S. High Yield Constrained Index | ||||
| Average Annual Return [Line Items] | ||||
| Line Graph and Table Measure Name | ICE BofA U.S. High Yield Constrained Index $15,939 | |||
| Average Annual Return, Percent | 16.49% | 4.37% | 4.77% | |
| Neuberger Index: ICE BofA U.S. High Yield Constrained Index | ||||
| Average Annual Return [Line Items] | ||||
| Line Graph and Table Measure Name | ICE BofA U.S. High Yield Constrained Index $15,939 | |||
| Average Annual Return, Percent | 16.49% | 4.37% | 4.77% | |
| Neuberger Index: 65% Bloomberg Municipal Bond Index and 35% | ||||
| Average Annual Return [Line Items] | ||||
| Line Graph and Table Measure Name | 65% Bloomberg Municipal Bond Index and 35% Bloomberg Municipal High Yield Index $1,330,500 | |||
| Average Annual Return, Percent | 12.37% | 1.66% | 3.09% | |
| Neuberger Index: 65% Bloomberg Municipal Bond Index and 35% | ||||
| Average Annual Return [Line Items] | ||||
| Line Graph and Table Measure Name | 65% Bloomberg Municipal Bond Index and 35% Bloomberg Municipal High Yield Index $13,305 | |||
| Average Annual Return, Percent | 12.37% | 1.66% | 3.09% | |
| Neuberger Index: 65% Bloomberg Municipal Bond Index and 35% | ||||
| Average Annual Return [Line Items] | ||||
| Line Graph and Table Measure Name | 65% Bloomberg Municipal Bond Index and 35% Bloomberg Municipal High Yield Index $13,305 | |||
| Average Annual Return, Percent | 12.37% | 1.66% | 3.09% | |
| Bloomberg 7-Year G.O. Index | ||||
| Average Annual Return [Line Items] | ||||
| Line Graph and Table Measure Name | Bloomberg 7-Year G.O. Index $12,068 | |||
| Average Annual Return, Percent | 6.46% | 0.90% | 1.90% | |
| Bloomberg 7-Year G.O. Index | ||||
| Average Annual Return [Line Items] | ||||
| Line Graph and Table Measure Name | Bloomberg 7-Year G.O. Index $1,206,800 | |||
| Average Annual Return, Percent | 6.46% | 0.90% | 1.90% | |
| Bloomberg 7-Year G.O. Index | ||||
| Average Annual Return [Line Items] | ||||
| Line Graph and Table Measure Name | Bloomberg 7-Year G.O. Index $12,068 | |||
| Average Annual Return, Percent | 6.46% | 0.90% | 1.90% | |
| Bloomberg 7-Year G.O. Index | ||||
| Average Annual Return [Line Items] | ||||
| Line Graph and Table Measure Name | Bloomberg 7-Year G.O. Index $12,068 | |||
| Average Annual Return, Percent | 6.46% | 0.90% | 1.90% |
| Shareholder Report, Holdings (Details) | Oct. 31, 2024 |
| C000129449 | State Street Institutional U.S. Government Money Market Fund Premier Class | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.60% |
| C000129449 | Indonesia Government | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.10% |
| C000129449 | Republic of South Africa | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.10% |
| C000129449 | Malaysia Government | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.80% |
| C000129449 | China Government | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.40% |
| C000129449 | Republic of Poland Government | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.10% |
| C000129449 | India Government | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.10% |
| C000129449 | Colombian TES | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.10% |
| C000129449 | Czech Republic Government | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000129449 | Mexico Government | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.10% |
| C000129449 | United States | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.30% |
| C000129449 | Indonesia | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.10% |
| C000129449 | Colombia | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.60% |
| C000129449 | South Africa | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.60% |
| C000129449 | Mexico | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.30% |
| C000129449 | Brazil | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.10% |
| C000129449 | China | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.60% |
| C000129449 | India | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.50% |
| C000129449 | Malaysia | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.10% |
| C000129449 | Poland | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.50% |
| C000129449 | AssetForeign Government Securities | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 63% |
| C000129449 | AssetCorporate Bonds | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 28.20% |
| C000129449 | AssetPurchased Option Contracts | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| C000129449 | AssetShort-Term Investments | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.50% |
| C000129449 | Asset Other Net Line | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.30% |
| C000129447 | State Street Institutional U.S. Government Money Market Fund Premier Class | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.60% |
| C000129447 | Indonesia Government | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.10% |
| C000129447 | Republic of South Africa | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.10% |
| C000129447 | Malaysia Government | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.80% |
| C000129447 | China Government | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.40% |
| C000129447 | Republic of Poland Government | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.10% |
| C000129447 | India Government | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.10% |
| C000129447 | Colombian TES | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.10% |
| C000129447 | Czech Republic Government | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000129447 | Mexico Government | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.10% |
| C000129447 | United States | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.30% |
| C000129447 | Indonesia | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.10% |
| C000129447 | Colombia | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.60% |
| C000129447 | South Africa | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.60% |
| C000129447 | Mexico | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.30% |
| C000129447 | Brazil | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.10% |
| C000129447 | China | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.60% |
| C000129447 | India | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.50% |
| C000129447 | Malaysia | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.10% |
| C000129447 | Poland | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.50% |
| C000129447 | AssetForeign Government Securities | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 63% |
| C000129447 | AssetCorporate Bonds | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 28.20% |
| C000129447 | AssetPurchased Option Contracts | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| C000129447 | AssetShort-Term Investments | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.50% |
| C000129447 | Asset Other Net Line | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.30% |
| C000129448 | State Street Institutional U.S. Government Money Market Fund Premier Class | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.60% |
| C000129448 | Indonesia Government | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.10% |
| C000129448 | Republic of South Africa | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.10% |
| C000129448 | Malaysia Government | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.80% |
| C000129448 | China Government | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.40% |
| C000129448 | Republic of Poland Government | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.10% |
| C000129448 | India Government | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.10% |
| C000129448 | Colombian TES | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.10% |
| C000129448 | Czech Republic Government | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000129448 | Mexico Government | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.10% |
| C000129448 | United States | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.30% |
| C000129448 | Indonesia | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.10% |
| C000129448 | Colombia | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.60% |
| C000129448 | South Africa | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.60% |
| C000129448 | Mexico | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.30% |
| C000129448 | Brazil | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.10% |
| C000129448 | China | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.60% |
| C000129448 | India | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.50% |
| C000129448 | Malaysia | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.10% |
| C000129448 | Poland | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.50% |
| C000129448 | AssetForeign Government Securities | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 63% |
| C000129448 | AssetCorporate Bonds | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 28.20% |
| C000129448 | AssetPurchased Option Contracts | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| C000129448 | AssetShort-Term Investments | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.50% |
| C000129448 | Asset Other Net Line | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.30% |
| C000082160 | State Street Institutional U.S. Government Money Market Fund Premier Class | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.30% |
| C000082160 | Southern Veterinary Partners LLC | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.70% |
| C000082160 | Zayo Group Holdings, Inc. | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.60% |
| C000082160 | Waterbridge Midstream Operating LLC | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.60% |
| C000082160 | Peraton Corp. | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.60% |
| C000082160 | CSC Holdings LLC | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.60% |
| C000082160 | Boost Newco Borrower LLC | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.60% |
| C000082160 | Star Parent, Inc. | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.60% |
| C000082160 | Aveanna Healthcare LLC | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.60% |
| C000082160 | Athenahealth Group, Inc. | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.60% |
| C000082160 | IndustryHealth Care | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8% |
| C000082160 | IndustryElectronics - Electrical | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.60% |
| C000082160 | IndustryInvestment Companies | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.30% |
| C000082160 | IndustryBusiness Equipment & Services | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.60% |
| C000082160 | IndustryFinancial Intermediaries | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.60% |
| C000082160 | IndustryOil & Gas | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.60% |
| C000082160 | IndustryUtilities | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.60% |
| C000082160 | IndustryIndustrial Equipment | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.20% |
| C000082160 | IndustryAerospace & Defense | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.10% |
| C000082160 | IndustryChemicals | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.90% |
| C000082158 | State Street Institutional U.S. Government Money Market Fund Premier Class | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.30% |
| C000082158 | Southern Veterinary Partners LLC | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.70% |
| C000082158 | Zayo Group Holdings, Inc. | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.60% |
| C000082158 | Waterbridge Midstream Operating LLC | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.60% |
| C000082158 | Peraton Corp. | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.60% |
| C000082158 | CSC Holdings LLC | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.60% |
| C000082158 | Boost Newco Borrower LLC | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.60% |
| C000082158 | Star Parent, Inc. | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.60% |
| C000082158 | Aveanna Healthcare LLC | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.60% |
| C000082158 | Athenahealth Group, Inc. | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.60% |
| C000082158 | IndustryHealth Care | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8% |
| C000082158 | IndustryElectronics - Electrical | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.60% |
| C000082158 | IndustryInvestment Companies | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.30% |
| C000082158 | IndustryBusiness Equipment & Services | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.60% |
| C000082158 | IndustryFinancial Intermediaries | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.60% |
| C000082158 | IndustryOil & Gas | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.60% |
| C000082158 | IndustryUtilities | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.60% |
| C000082158 | IndustryIndustrial Equipment | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.20% |
| C000082158 | IndustryAerospace & Defense | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.10% |
| C000082158 | IndustryChemicals | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.90% |
| C000082159 | State Street Institutional U.S. Government Money Market Fund Premier Class | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.30% |
| C000082159 | Southern Veterinary Partners LLC | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.70% |
| C000082159 | Zayo Group Holdings, Inc. | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.60% |
| C000082159 | Waterbridge Midstream Operating LLC | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.60% |
| C000082159 | Peraton Corp. | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.60% |
| C000082159 | CSC Holdings LLC | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.60% |
| C000082159 | Boost Newco Borrower LLC | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.60% |
| C000082159 | Star Parent, Inc. | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.60% |
| C000082159 | Aveanna Healthcare LLC | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.60% |
| C000082159 | Athenahealth Group, Inc. | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.60% |
| C000082159 | IndustryHealth Care | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8% |
| C000082159 | IndustryElectronics - Electrical | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.60% |
| C000082159 | IndustryInvestment Companies | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.30% |
| C000082159 | IndustryBusiness Equipment & Services | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.60% |
| C000082159 | IndustryFinancial Intermediaries | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.60% |
| C000082159 | IndustryOil & Gas | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.60% |
| C000082159 | IndustryUtilities | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.60% |
| C000082159 | IndustryIndustrial Equipment | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.20% |
| C000082159 | IndustryAerospace & Defense | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.10% |
| C000082159 | IndustryChemicals | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.90% |
| C000021322 | State Street Institutional U.S. Government Money Market Fund Premier Class | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.70% |
| C000021322 | CSC Holdings LLC | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.30% |
| C000021322 | CCO Holdings LLC/CCO Holdings Capital Corp. | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000021322 | TransDigm, Inc. | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.50% |
| C000021322 | NRG Energy, Inc. | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1% |
| C000021322 | Medline Borrower LP | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.90% |
| C000021322 | Venture Global LNG, Inc. | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.90% |
| C000021322 | Vistra Operations Co. LLC | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.80% |
| C000021322 | Olympus Water U.S. Holding Corp. | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.80% |
| C000021322 | Alliant Holdings Intermediate LLC/Alliant Holdings Co-Issuer | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.80% |
| C000021322 | IndustryChemicals | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5% |
| C000021322 | IndustryMedia | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.20% |
| C000021322 | IndustryPipelines | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.40% |
| C000021322 | IndustryCommercial Services | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.20% |
| C000021322 | IndustryElectric | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.70% |
| C000021322 | IndustryTelecommunications | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.50% |
| C000021322 | IndustryRetail | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.40% |
| C000021322 | IndustryDiversified Financial Services | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4% |
| C000021322 | IndustryInsurance | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.90% |
| C000021322 | IndustryHealthcare - Services | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.50% |
| C000064460 | State Street Institutional U.S. Government Money Market Fund Premier Class | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.70% |
| C000064460 | CSC Holdings LLC | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.30% |
| C000064460 | CCO Holdings LLC/CCO Holdings Capital Corp. | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000064460 | TransDigm, Inc. | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.50% |
| C000064460 | NRG Energy, Inc. | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1% |
| C000064460 | Medline Borrower LP | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.90% |
| C000064460 | Venture Global LNG, Inc. | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.90% |
| C000064460 | Vistra Operations Co. LLC | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.80% |
| C000064460 | Olympus Water U.S. Holding Corp. | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.80% |
| C000064460 | Alliant Holdings Intermediate LLC/Alliant Holdings Co-Issuer | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.80% |
| C000064460 | IndustryChemicals | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5% |
| C000064460 | IndustryMedia | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.20% |
| C000064460 | IndustryPipelines | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.40% |
| C000064460 | IndustryCommercial Services | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.20% |
| C000064460 | IndustryElectric | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.70% |
| C000064460 | IndustryTelecommunications | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.50% |
| C000064460 | IndustryRetail | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.40% |
| C000064460 | IndustryDiversified Financial Services | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4% |
| C000064460 | IndustryInsurance | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.90% |
| C000064460 | IndustryHealthcare - Services | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.50% |
| C000077167 | State Street Institutional U.S. Government Money Market Fund Premier Class | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.70% |
| C000077167 | CSC Holdings LLC | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.30% |
| C000077167 | CCO Holdings LLC/CCO Holdings Capital Corp. | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000077167 | TransDigm, Inc. | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.50% |
| C000077167 | NRG Energy, Inc. | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1% |
| C000077167 | Medline Borrower LP | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.90% |
| C000077167 | Venture Global LNG, Inc. | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.90% |
| C000077167 | Vistra Operations Co. LLC | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.80% |
| C000077167 | Olympus Water U.S. Holding Corp. | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.80% |
| C000077167 | Alliant Holdings Intermediate LLC/Alliant Holdings Co-Issuer | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.80% |
| C000077167 | IndustryChemicals | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5% |
| C000077167 | IndustryMedia | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.20% |
| C000077167 | IndustryPipelines | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.40% |
| C000077167 | IndustryCommercial Services | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.20% |
| C000077167 | IndustryElectric | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.70% |
| C000077167 | IndustryTelecommunications | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.50% |
| C000077167 | IndustryRetail | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.40% |
| C000077167 | IndustryDiversified Financial Services | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4% |
| C000077167 | IndustryInsurance | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.90% |
| C000077167 | IndustryHealthcare - Services | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.50% |
| C000077168 | State Street Institutional U.S. Government Money Market Fund Premier Class | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.70% |
| C000077168 | CSC Holdings LLC | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.30% |
| C000077168 | CCO Holdings LLC/CCO Holdings Capital Corp. | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000077168 | TransDigm, Inc. | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.50% |
| C000077168 | NRG Energy, Inc. | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1% |
| C000077168 | Medline Borrower LP | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.90% |
| C000077168 | Venture Global LNG, Inc. | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.90% |
| C000077168 | Vistra Operations Co. LLC | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.80% |
| C000077168 | Olympus Water U.S. Holding Corp. | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.80% |
| C000077168 | Alliant Holdings Intermediate LLC/Alliant Holdings Co-Issuer | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.80% |
| C000077168 | IndustryChemicals | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5% |
| C000077168 | IndustryMedia | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.20% |
| C000077168 | IndustryPipelines | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.40% |
| C000077168 | IndustryCommercial Services | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.20% |
| C000077168 | IndustryElectric | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.70% |
| C000077168 | IndustryTelecommunications | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.50% |
| C000077168 | IndustryRetail | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.40% |
| C000077168 | IndustryDiversified Financial Services | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4% |
| C000077168 | IndustryInsurance | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.90% |
| C000077168 | IndustryHealthcare - Services | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.50% |
| C000077170 | State Street Institutional U.S. Government Money Market Fund Premier Class | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.70% |
| C000077170 | CSC Holdings LLC | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.30% |
| C000077170 | CCO Holdings LLC/CCO Holdings Capital Corp. | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000077170 | TransDigm, Inc. | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.50% |
| C000077170 | NRG Energy, Inc. | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1% |
| C000077170 | Medline Borrower LP | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.90% |
| C000077170 | Venture Global LNG, Inc. | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.90% |
| C000077170 | Vistra Operations Co. LLC | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.80% |
| C000077170 | Olympus Water U.S. Holding Corp. | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.80% |
| C000077170 | Alliant Holdings Intermediate LLC/Alliant Holdings Co-Issuer | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.80% |
| C000077170 | IndustryChemicals | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5% |
| C000077170 | IndustryMedia | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.20% |
| C000077170 | IndustryPipelines | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.40% |
| C000077170 | IndustryCommercial Services | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.20% |
| C000077170 | IndustryElectric | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.70% |
| C000077170 | IndustryTelecommunications | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.50% |
| C000077170 | IndustryRetail | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.40% |
| C000077170 | IndustryDiversified Financial Services | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4% |
| C000077170 | IndustryInsurance | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.90% |
| C000077170 | IndustryHealthcare - Services | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.50% |
| C000125075 | State Street Institutional U.S. Government Money Market Fund Premier Class | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.70% |
| C000125075 | CSC Holdings LLC | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.30% |
| C000125075 | CCO Holdings LLC/CCO Holdings Capital Corp. | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000125075 | TransDigm, Inc. | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.50% |
| C000125075 | NRG Energy, Inc. | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1% |
| C000125075 | Medline Borrower LP | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.90% |
| C000125075 | Venture Global LNG, Inc. | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.90% |
| C000125075 | Vistra Operations Co. LLC | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.80% |
| C000125075 | Olympus Water U.S. Holding Corp. | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.80% |
| C000125075 | Alliant Holdings Intermediate LLC/Alliant Holdings Co-Issuer | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.80% |
| C000125075 | IndustryChemicals | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5% |
| C000125075 | IndustryMedia | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.20% |
| C000125075 | IndustryPipelines | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.40% |
| C000125075 | IndustryCommercial Services | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.20% |
| C000125075 | IndustryElectric | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.70% |
| C000125075 | IndustryTelecommunications | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.50% |
| C000125075 | IndustryRetail | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.40% |
| C000125075 | IndustryDiversified Financial Services | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4% |
| C000125075 | IndustryInsurance | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.90% |
| C000125075 | IndustryHealthcare - Services | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.50% |
| C000228875 | State Street Institutional U.S. Government Money Market Fund Premier Class | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.70% |
| C000228875 | CSC Holdings LLC | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.30% |
| C000228875 | CCO Holdings LLC/CCO Holdings Capital Corp. | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000228875 | TransDigm, Inc. | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.50% |
| C000228875 | NRG Energy, Inc. | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1% |
| C000228875 | Medline Borrower LP | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.90% |
| C000228875 | Venture Global LNG, Inc. | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.90% |
| C000228875 | Vistra Operations Co. LLC | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.80% |
| C000228875 | Olympus Water U.S. Holding Corp. | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.80% |
| C000228875 | Alliant Holdings Intermediate LLC/Alliant Holdings Co-Issuer | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.80% |
| C000228875 | IndustryChemicals | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5% |
| C000228875 | IndustryMedia | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.20% |
| C000228875 | IndustryPipelines | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.40% |
| C000228875 | IndustryCommercial Services | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.20% |
| C000228875 | IndustryElectric | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.70% |
| C000228875 | IndustryTelecommunications | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.50% |
| C000228875 | IndustryRetail | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.40% |
| C000228875 | IndustryDiversified Financial Services | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4% |
| C000228875 | IndustryInsurance | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.90% |
| C000228875 | IndustryHealthcare - Services | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.50% |
| C000157073 | New York | |
| Holdings [Line Items] | |
| Percent of Total Investments | 9.80% |
| C000157073 | California | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8.90% |
| C000157073 | Texas | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8% |
| C000157073 | Florida | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.10% |
| C000157073 | Colorado | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.60% |
| C000157073 | South Carolina | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.90% |
| C000157073 | Ohio | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.60% |
| C000157073 | Wisconsin | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.10% |
| C000157073 | Alabama | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4% |
| C000157073 | West Virginia | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.40% |
| C000157071 | New York | |
| Holdings [Line Items] | |
| Percent of Total Investments | 9.80% |
| C000157071 | California | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8.90% |
| C000157071 | Texas | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8% |
| C000157071 | Florida | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.10% |
| C000157071 | Colorado | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.60% |
| C000157071 | South Carolina | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.90% |
| C000157071 | Ohio | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.60% |
| C000157071 | Wisconsin | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.10% |
| C000157071 | Alabama | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4% |
| C000157071 | West Virginia | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.40% |
| C000157072 | New York | |
| Holdings [Line Items] | |
| Percent of Total Investments | 9.80% |
| C000157072 | California | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8.90% |
| C000157072 | Texas | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8% |
| C000157072 | Florida | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.10% |
| C000157072 | Colorado | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.60% |
| C000157072 | South Carolina | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.90% |
| C000157072 | Ohio | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.60% |
| C000157072 | Wisconsin | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.10% |
| C000157072 | Alabama | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4% |
| C000157072 | West Virginia | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.40% |
| C000121799 | New York | |
| Holdings [Line Items] | |
| Percent of Total Investments | 11% |
| C000121799 | Texas | |
| Holdings [Line Items] | |
| Percent of Total Investments | 9.20% |
| C000121799 | Florida | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.20% |
| C000121799 | South Carolina | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.70% |
| C000121799 | West Virginia | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6% |
| C000121799 | Michigan | |
| Holdings [Line Items] | |
| Percent of Total Investments | 11.40% |
| C000121799 | Illinois | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.10% |
| C000121799 | Kentucky | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.80% |
| C000121799 | Indiana | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.70% |
| C000121799 | Oklahoma | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4% |
| C000121799 | Revenue Bonds | |
| Holdings [Line Items] | |
| Percent of Total Investments | 71.70% |
| C000121799 | General Obligations | |
| Holdings [Line Items] | |
| Percent of Total Investments | 24.60% |
| C000121799 | Certificate Participation | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000121799 | Pre-Refunded | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.40% |
| C000201844 | New York | |
| Holdings [Line Items] | |
| Percent of Total Investments | 11% |
| C000201844 | Texas | |
| Holdings [Line Items] | |
| Percent of Total Investments | 9.20% |
| C000201844 | Florida | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.20% |
| C000201844 | South Carolina | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.70% |
| C000201844 | West Virginia | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6% |
| C000201844 | Michigan | |
| Holdings [Line Items] | |
| Percent of Total Investments | 11.40% |
| C000201844 | Illinois | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.10% |
| C000201844 | Kentucky | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.80% |
| C000201844 | Indiana | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.70% |
| C000201844 | Oklahoma | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4% |
| C000201844 | Revenue Bonds | |
| Holdings [Line Items] | |
| Percent of Total Investments | 71.70% |
| C000201844 | General Obligations | |
| Holdings [Line Items] | |
| Percent of Total Investments | 24.60% |
| C000201844 | Certificate Participation | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000201844 | Pre-Refunded | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.40% |
| C000201845 | New York | |
| Holdings [Line Items] | |
| Percent of Total Investments | 11% |
| C000201845 | Texas | |
| Holdings [Line Items] | |
| Percent of Total Investments | 9.20% |
| C000201845 | Florida | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.20% |
| C000201845 | South Carolina | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.70% |
| C000201845 | West Virginia | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6% |
| C000201845 | Michigan | |
| Holdings [Line Items] | |
| Percent of Total Investments | 11.40% |
| C000201845 | Illinois | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.10% |
| C000201845 | Kentucky | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.80% |
| C000201845 | Indiana | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.70% |
| C000201845 | Oklahoma | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4% |
| C000201845 | Revenue Bonds | |
| Holdings [Line Items] | |
| Percent of Total Investments | 71.70% |
| C000201845 | General Obligations | |
| Holdings [Line Items] | |
| Percent of Total Investments | 24.60% |
| C000201845 | Certificate Participation | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000201845 | Pre-Refunded | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.40% |
| C000021323 | New York | |
| Holdings [Line Items] | |
| Percent of Total Investments | 17.50% |
| C000021323 | California | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.40% |
| C000021323 | Texas | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.70% |
| C000021323 | Florida | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.90% |
| C000021323 | Illinois | |
| Holdings [Line Items] | |
| Percent of Total Investments | 15.20% |
| C000021323 | Indiana | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.10% |
| C000021323 | Pennsylvania | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.60% |
| C000021323 | Georgia | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.80% |
| C000021323 | New Jersey | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.60% |
| C000021323 | Utah | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.20% |
| C000089979 | New York | |
| Holdings [Line Items] | |
| Percent of Total Investments | 17.50% |
| C000089979 | California | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.40% |
| C000089979 | Texas | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.70% |
| C000089979 | Florida | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.90% |
| C000089979 | Illinois | |
| Holdings [Line Items] | |
| Percent of Total Investments | 15.20% |
| C000089979 | Indiana | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.10% |
| C000089979 | Pennsylvania | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.60% |
| C000089979 | Georgia | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.80% |
| C000089979 | New Jersey | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.60% |
| C000089979 | Utah | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.20% |
| C000089977 | New York | |
| Holdings [Line Items] | |
| Percent of Total Investments | 17.50% |
| C000089977 | California | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.40% |
| C000089977 | Texas | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.70% |
| C000089977 | Florida | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.90% |
| C000089977 | Illinois | |
| Holdings [Line Items] | |
| Percent of Total Investments | 15.20% |
| C000089977 | Indiana | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.10% |
| C000089977 | Pennsylvania | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.60% |
| C000089977 | Georgia | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.80% |
| C000089977 | New Jersey | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.60% |
| C000089977 | Utah | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.20% |
| C000089978 | New York | |
| Holdings [Line Items] | |
| Percent of Total Investments | 17.50% |
| C000089978 | California | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.40% |
| C000089978 | Texas | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.70% |
| C000089978 | Florida | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.90% |
| C000089978 | Illinois | |
| Holdings [Line Items] | |
| Percent of Total Investments | 15.20% |
| C000089978 | Indiana | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.10% |
| C000089978 | Pennsylvania | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.60% |
| C000089978 | Georgia | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.80% |
| C000089978 | New Jersey | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.60% |
| C000089978 | Utah | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.20% |
| C000021325 | State Street Institutional U.S. Government Money Market Fund Premier Class | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.50% |
| C000021325 | U.S. Treasury | |
| Holdings [Line Items] | |
| Percent of Total Investments | 26% |
| C000021325 | Federal National Mortgage Association | |
| Holdings [Line Items] | |
| Percent of Total Investments | 14.70% |
| C000021325 | Federal Home Loan Mortgage Corp. | |
| Holdings [Line Items] | |
| Percent of Total Investments | 11.10% |
| C000021325 | Government National Mortgage Association | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.20% |
| C000021325 | Warnermedia Holdings, Inc. | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.10% |
| C000021325 | Broadcom, Inc. | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1% |
| C000021325 | Federal Home Loan Mortgage Corp. STACR REMIC Trust | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.90% |
| C000021325 | Federal National Mortgage Association Connecticut Avenue Securities | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.80% |
| C000021325 | Aon North America, Inc. | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.80% |
| C000021325 | AssetForeign Government Securities | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.70% |
| C000021325 | AssetCorporate Bonds | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 24.20% |
| C000021325 | AssetShort-Term Investments | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.50% |
| C000021325 | Asset Other Net Line | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| C000021325 | AssetMortgage-Backed Securities | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 37.10% |
| C000021325 | AssetU.S. Treasury Obligations | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 26% |
| C000021325 | AssetAsset-Backed Securities | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.10% |
| C000021325 | AssetU.S. Government Agency Securities | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.40% |
| C000021326 | State Street Institutional U.S. Government Money Market Fund Premier Class | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.50% |
| C000021326 | U.S. Treasury | |
| Holdings [Line Items] | |
| Percent of Total Investments | 26% |
| C000021326 | Federal National Mortgage Association | |
| Holdings [Line Items] | |
| Percent of Total Investments | 14.70% |
| C000021326 | Federal Home Loan Mortgage Corp. | |
| Holdings [Line Items] | |
| Percent of Total Investments | 11.10% |
| C000021326 | Government National Mortgage Association | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.20% |
| C000021326 | Warnermedia Holdings, Inc. | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.10% |
| C000021326 | Broadcom, Inc. | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1% |
| C000021326 | Federal Home Loan Mortgage Corp. STACR REMIC Trust | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.90% |
| C000021326 | Federal National Mortgage Association Connecticut Avenue Securities | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.80% |
| C000021326 | Aon North America, Inc. | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.80% |
| C000021326 | AssetForeign Government Securities | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.70% |
| C000021326 | AssetCorporate Bonds | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 24.20% |
| C000021326 | AssetShort-Term Investments | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.50% |
| C000021326 | Asset Other Net Line | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| C000021326 | AssetMortgage-Backed Securities | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 37.10% |
| C000021326 | AssetU.S. Treasury Obligations | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 26% |
| C000021326 | AssetAsset-Backed Securities | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.10% |
| C000021326 | AssetU.S. Government Agency Securities | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.40% |
| C000057304 | State Street Institutional U.S. Government Money Market Fund Premier Class | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.50% |
| C000057304 | U.S. Treasury | |
| Holdings [Line Items] | |
| Percent of Total Investments | 26% |
| C000057304 | Federal National Mortgage Association | |
| Holdings [Line Items] | |
| Percent of Total Investments | 14.70% |
| C000057304 | Federal Home Loan Mortgage Corp. | |
| Holdings [Line Items] | |
| Percent of Total Investments | 11.10% |
| C000057304 | Government National Mortgage Association | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.20% |
| C000057304 | Warnermedia Holdings, Inc. | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.10% |
| C000057304 | Broadcom, Inc. | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1% |
| C000057304 | Federal Home Loan Mortgage Corp. STACR REMIC Trust | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.90% |
| C000057304 | Federal National Mortgage Association Connecticut Avenue Securities | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.80% |
| C000057304 | Aon North America, Inc. | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.80% |
| C000057304 | AssetForeign Government Securities | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.70% |
| C000057304 | AssetCorporate Bonds | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 24.20% |
| C000057304 | AssetShort-Term Investments | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.50% |
| C000057304 | Asset Other Net Line | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| C000057304 | AssetMortgage-Backed Securities | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 37.10% |
| C000057304 | AssetU.S. Treasury Obligations | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 26% |
| C000057304 | AssetAsset-Backed Securities | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.10% |
| C000057304 | AssetU.S. Government Agency Securities | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.40% |
| C000057305 | State Street Institutional U.S. Government Money Market Fund Premier Class | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.50% |
| C000057305 | U.S. Treasury | |
| Holdings [Line Items] | |
| Percent of Total Investments | 26% |
| C000057305 | Federal National Mortgage Association | |
| Holdings [Line Items] | |
| Percent of Total Investments | 14.70% |
| C000057305 | Federal Home Loan Mortgage Corp. | |
| Holdings [Line Items] | |
| Percent of Total Investments | 11.10% |
| C000057305 | Government National Mortgage Association | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.20% |
| C000057305 | Warnermedia Holdings, Inc. | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.10% |
| C000057305 | Broadcom, Inc. | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1% |
| C000057305 | Federal Home Loan Mortgage Corp. STACR REMIC Trust | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.90% |
| C000057305 | Federal National Mortgage Association Connecticut Avenue Securities | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.80% |
| C000057305 | Aon North America, Inc. | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.80% |
| C000057305 | AssetForeign Government Securities | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.70% |
| C000057305 | AssetCorporate Bonds | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 24.20% |
| C000057305 | AssetShort-Term Investments | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.50% |
| C000057305 | Asset Other Net Line | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| C000057305 | AssetMortgage-Backed Securities | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 37.10% |
| C000057305 | AssetU.S. Treasury Obligations | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 26% |
| C000057305 | AssetAsset-Backed Securities | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.10% |
| C000057305 | AssetU.S. Government Agency Securities | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.40% |
| C000153036 | State Street Institutional U.S. Government Money Market Fund Premier Class | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.50% |
| C000153036 | U.S. Treasury | |
| Holdings [Line Items] | |
| Percent of Total Investments | 26% |
| C000153036 | Federal National Mortgage Association | |
| Holdings [Line Items] | |
| Percent of Total Investments | 14.70% |
| C000153036 | Federal Home Loan Mortgage Corp. | |
| Holdings [Line Items] | |
| Percent of Total Investments | 11.10% |
| C000153036 | Government National Mortgage Association | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.20% |
| C000153036 | Warnermedia Holdings, Inc. | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.10% |
| C000153036 | Broadcom, Inc. | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1% |
| C000153036 | Federal Home Loan Mortgage Corp. STACR REMIC Trust | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.90% |
| C000153036 | Federal National Mortgage Association Connecticut Avenue Securities | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.80% |
| C000153036 | Aon North America, Inc. | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.80% |
| C000153036 | AssetForeign Government Securities | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.70% |
| C000153036 | AssetCorporate Bonds | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 24.20% |
| C000153036 | AssetShort-Term Investments | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.50% |
| C000153036 | Asset Other Net Line | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| C000153036 | AssetMortgage-Backed Securities | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 37.10% |
| C000153036 | AssetU.S. Treasury Obligations | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 26% |
| C000153036 | AssetAsset-Backed Securities | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.10% |
| C000153036 | AssetU.S. Government Agency Securities | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.40% |
| C000044074 | State Street Institutional U.S. Government Money Market Fund Premier Class | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.50% |
| C000044074 | U.S. Treasury | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.10% |
| C000044074 | Federal National Mortgage Association | |
| Holdings [Line Items] | |
| Percent of Total Investments | 17.60% |
| C000044074 | Federal Home Loan Mortgage Corp. | |
| Holdings [Line Items] | |
| Percent of Total Investments | 14.20% |
| C000044074 | Government National Mortgage Association | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.20% |
| C000044074 | Federal National Mortgage Association Connecticut Avenue Securities | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.60% |
| C000044074 | Federal Home Loan Mortgage Corp. STACR REMIC | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.90% |
| C000044074 | BX Trust | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.10% |
| C000044074 | Verus Securitization Trust | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.90% |
| C000044074 | iShares iBoxx $ Investment Grade Corporate Bond ETF | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.90% |
| C000044074 | AssetForeign Government Securities | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.10% |
| C000044074 | AssetCorporate Bonds | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 26.20% |
| C000044074 | AssetShort-Term Investments | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.60% |
| C000044074 | Asset Other Net Line | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | (2.20%) |
| C000044074 | AssetMortgage-Backed Securities | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 52.70% |
| C000044074 | AssetU.S. Treasury Obligations | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.20% |
| C000044074 | AssetAsset-Backed Securities | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10.70% |
| C000044074 | AssetU.S. Government Agency Securities | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| C000044074 | AssetExchange-Traded Funds | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.10% |
| C000044074 | AssetMunicipal Notes | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.60% |
| C000044074 | AssetLoan Assignments | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| C000044074 | AssetConvertible Bonds | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| C000044074 | AssetClosed-End Funds | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| C000021324 | State Street Institutional U.S. Government Money Market Fund Premier Class | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.50% |
| C000021324 | U.S. Treasury | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.10% |
| C000021324 | Federal National Mortgage Association | |
| Holdings [Line Items] | |
| Percent of Total Investments | 17.60% |
| C000021324 | Federal Home Loan Mortgage Corp. | |
| Holdings [Line Items] | |
| Percent of Total Investments | 14.20% |
| C000021324 | Government National Mortgage Association | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.20% |
| C000021324 | Federal National Mortgage Association Connecticut Avenue Securities | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.60% |
| C000021324 | Federal Home Loan Mortgage Corp. STACR REMIC | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.90% |
| C000021324 | BX Trust | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.10% |
| C000021324 | Verus Securitization Trust | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.90% |
| C000021324 | iShares iBoxx $ Investment Grade Corporate Bond ETF | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.90% |
| C000021324 | AssetForeign Government Securities | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.10% |
| C000021324 | AssetCorporate Bonds | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 26.20% |
| C000021324 | AssetShort-Term Investments | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.60% |
| C000021324 | Asset Other Net Line | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | (2.20%) |
| C000021324 | AssetMortgage-Backed Securities | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 52.70% |
| C000021324 | AssetU.S. Treasury Obligations | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.20% |
| C000021324 | AssetAsset-Backed Securities | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10.70% |
| C000021324 | AssetU.S. Government Agency Securities | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| C000021324 | AssetExchange-Traded Funds | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.10% |
| C000021324 | AssetMunicipal Notes | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.60% |
| C000021324 | AssetLoan Assignments | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| C000021324 | AssetConvertible Bonds | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| C000021324 | AssetClosed-End Funds | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| C000057302 | State Street Institutional U.S. Government Money Market Fund Premier Class | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.50% |
| C000057302 | U.S. Treasury | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.10% |
| C000057302 | Federal National Mortgage Association | |
| Holdings [Line Items] | |
| Percent of Total Investments | 17.60% |
| C000057302 | Federal Home Loan Mortgage Corp. | |
| Holdings [Line Items] | |
| Percent of Total Investments | 14.20% |
| C000057302 | Government National Mortgage Association | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.20% |
| C000057302 | Federal National Mortgage Association Connecticut Avenue Securities | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.60% |
| C000057302 | Federal Home Loan Mortgage Corp. STACR REMIC | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.90% |
| C000057302 | BX Trust | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.10% |
| C000057302 | Verus Securitization Trust | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.90% |
| C000057302 | iShares iBoxx $ Investment Grade Corporate Bond ETF | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.90% |
| C000057302 | AssetForeign Government Securities | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.10% |
| C000057302 | AssetCorporate Bonds | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 26.20% |
| C000057302 | AssetShort-Term Investments | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.60% |
| C000057302 | Asset Other Net Line | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | (2.20%) |
| C000057302 | AssetMortgage-Backed Securities | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 52.70% |
| C000057302 | AssetU.S. Treasury Obligations | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.20% |
| C000057302 | AssetAsset-Backed Securities | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10.70% |
| C000057302 | AssetU.S. Government Agency Securities | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| C000057302 | AssetExchange-Traded Funds | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.10% |
| C000057302 | AssetMunicipal Notes | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.60% |
| C000057302 | AssetLoan Assignments | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| C000057302 | AssetConvertible Bonds | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| C000057302 | AssetClosed-End Funds | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| C000057303 | State Street Institutional U.S. Government Money Market Fund Premier Class | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.50% |
| C000057303 | U.S. Treasury | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.10% |
| C000057303 | Federal National Mortgage Association | |
| Holdings [Line Items] | |
| Percent of Total Investments | 17.60% |
| C000057303 | Federal Home Loan Mortgage Corp. | |
| Holdings [Line Items] | |
| Percent of Total Investments | 14.20% |
| C000057303 | Government National Mortgage Association | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.20% |
| C000057303 | Federal National Mortgage Association Connecticut Avenue Securities | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.60% |
| C000057303 | Federal Home Loan Mortgage Corp. STACR REMIC | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.90% |
| C000057303 | BX Trust | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.10% |
| C000057303 | Verus Securitization Trust | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.90% |
| C000057303 | iShares iBoxx $ Investment Grade Corporate Bond ETF | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.90% |
| C000057303 | AssetForeign Government Securities | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.10% |
| C000057303 | AssetCorporate Bonds | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 26.20% |
| C000057303 | AssetShort-Term Investments | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.60% |
| C000057303 | Asset Other Net Line | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | (2.20%) |
| C000057303 | AssetMortgage-Backed Securities | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 52.70% |
| C000057303 | AssetU.S. Treasury Obligations | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.20% |
| C000057303 | AssetAsset-Backed Securities | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10.70% |
| C000057303 | AssetU.S. Government Agency Securities | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| C000057303 | AssetExchange-Traded Funds | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.10% |
| C000057303 | AssetMunicipal Notes | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.60% |
| C000057303 | AssetLoan Assignments | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| C000057303 | AssetConvertible Bonds | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| C000057303 | AssetClosed-End Funds | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| C000125076 | State Street Institutional U.S. Government Money Market Fund Premier Class | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.50% |
| C000125076 | U.S. Treasury | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.10% |
| C000125076 | Federal National Mortgage Association | |
| Holdings [Line Items] | |
| Percent of Total Investments | 17.60% |
| C000125076 | Federal Home Loan Mortgage Corp. | |
| Holdings [Line Items] | |
| Percent of Total Investments | 14.20% |
| C000125076 | Government National Mortgage Association | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.20% |
| C000125076 | Federal National Mortgage Association Connecticut Avenue Securities | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.60% |
| C000125076 | Federal Home Loan Mortgage Corp. STACR REMIC | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.90% |
| C000125076 | BX Trust | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.10% |
| C000125076 | Verus Securitization Trust | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.90% |
| C000125076 | iShares iBoxx $ Investment Grade Corporate Bond ETF | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.90% |
| C000125076 | AssetForeign Government Securities | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.10% |
| C000125076 | AssetCorporate Bonds | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 26.20% |
| C000125076 | AssetShort-Term Investments | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.60% |
| C000125076 | Asset Other Net Line | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | (2.20%) |
| C000125076 | AssetMortgage-Backed Securities | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 52.70% |
| C000125076 | AssetU.S. Treasury Obligations | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.20% |
| C000125076 | AssetAsset-Backed Securities | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10.70% |
| C000125076 | AssetU.S. Government Agency Securities | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| C000125076 | AssetExchange-Traded Funds | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.10% |
| C000125076 | AssetMunicipal Notes | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.60% |
| C000125076 | AssetLoan Assignments | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| C000125076 | AssetConvertible Bonds | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| C000125076 | AssetClosed-End Funds | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
