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Label Element Value
Risk/Return: rr_RiskReturnAbstract  
Document Type dei_DocumentType 485BPOS
Document Period End Date dei_DocumentPeriodEndDate Nov. 30, 2011
Registrant Name dei_EntityRegistrantName Vanguard New Jersey Tax-Free Funds
Central Index Key dei_EntityCentralIndexKey 0000821404
Amendment Flag dei_AmendmentFlag false
Document Creation Date dei_DocumentCreationDate Apr. 11, 2012
Document Effective Date dei_DocumentEffectiveDate Mar. 28, 2012
Vanguard New Jersey Long-Term Tax-Exempt Fund | Retail
  
Risk/Return: rr_RiskReturnAbstract  
Prospectus Date rr_ProspectusDate Mar. 28, 2012
Risk/Return rr_RiskReturnHeading Risk/Return
Investment objective: rr_ObjectiveHeading Investment Objective
Investment objective rr_ObjectivePrimaryTextBlock

The Fund seeks to provide current income that is exempt from both federal and New Jersey state personal income taxes. The Fund is intended for New Jersey state residents only.
Expenses Heading rr_ExpenseHeading Fees and Expenses
Fees and Expenses of the Fund rr_ExpenseNarrativeTextBlock

The following table describes the fees and expenses you may pay if you buy and hold Investor Shares or Admiral Shares of the Fund.
Shareholder Fees Caption rr_ShareholderFeesCaption Shareholder Fees (Fees paid directly from your investment)
Operating Expenses Caption rr_OperatingExpensesCaption Annual Fund Operating Expenses (Expenses that you pay each year as a percentage of the value of your investment)
Portfolio Turnover Heading rr_PortfolioTurnoverHeading

Portfolio Turnover
Portfolio Turnover rr_PortfolioTurnoverTextBlock

The Fund pays transaction costs, such as commissions, when it buys and sells securities (or 'turns over' its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in more taxes when Fund shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the previous expense examples, reduce the Fund's performance. During the most recent fiscal year, the Fund's portfolio turnover rate was 12%.

PortfolioTurnover, Rate rr_PortfolioTurnoverRate 12.00%
EXAMPLE rr_ExpenseExampleHeading

Examples
Expense Example, Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock

The following examples are intended to help you compare the cost of investing in the Fund's Investor Shares or Admiral Shares with the cost of investing in other mutual funds. They illustrate the hypothetical expenses that you would incur over various periods if you invest $10,000 in the Fund's shares. These examples assume that the Shares provide a return of 5% a year and that operating expenses remain as stated in the preceding table. The results apply whether or not you redeem your investment at the end of the given period. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Strategy: rr_StrategyHeading Primary Investment Strategies
StrategyNarrative rr_StrategyNarrativeTextBlock

The Fund invests primarily in high-quality municipal bonds issued by New Jersey state state and local governments and regional governmental authorities. At least 80% of the Fund's assets will be invested in securities whose income is exempt from federal and New Jersey state taxes. Although the Fund has no limitations on the maturities of individual securities, its dollar-weighted average maturity is expected to be between 10 and 25 years.
Risk: rr_RiskHeading Primary Risks
Risk Narrative rr_RiskNarrativeTextBlock

An investment in the Fund could lose money over short or even long periods. You should expect the Fund's share price and total return to fluctuate within a wide range, like the fluctuations of the overall bond market. The Fund's performance could be hurt by:

State-specific risk, which is the chance that developments in New Jersey state will adversely affect the securities held by the Fund. Because the Fund invests primarily in securities issued by New Jersey state and its municipalities, it is more vulnerable to unfavorable developments in New Jersey state than are funds that invest in municipal securities of many states. Unfavorable developments in any economic sector may have far-reaching ramifications on the overall New Jersey state municipal market.

Interest rate risk, which is the chance that bond prices overall will decline because of rising interest rates. Interest rate risk should be high for the Fund because it invests primarily in long-term bonds, whose prices are much more sensitive to interest rate changes than are the prices of short-term bonds.

Call risk, which is the chance that during periods of falling interest rates, issuers of callable bonds may call (redeem) securities with higher coupons or interest rates before their maturity dates. The Fund would then lose any price appreciation above the bond's call price and would be forced to reinvest the unanticipated proceeds at lower interest rates, resulting in a decline in the Fund's income. Call risk is generally high for long-term bond funds.

Credit risk, which is the chance that a bond issuer will fail to pay interest and principal in a timely manner, or that negative perceptions of the issuer's ability to make such payments will cause the price of that bond to decline. Credit risk should be low for the Fund, because it invests mainly in bonds that are considered to be of high quality.

Income risk, which is the chance that the Fund's income will decline because of falling interest rates. Income risk is generally low for long-term bond funds.

Liquidity risk, which is the chance that the Fund may not be able to sell a security in a timely manner at a desired price. Liquidity risk is generally high for long-term bond funds.

Manager risk, which is the chance that poor security selection will cause the Fund to underperform relevant benchmarks or other funds with a similar investment objective.

Nondiversification risk, which is the chance that the Fund's performance may be hurt disproportionately by the poor performance of relatively few securities. The Fund is considered nondiversified, which means that it may invest a greater percentage of its assets in the securities of particular issuers as compared with other mutual funds.

An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
May Lose Money rr_RiskLoseMoney

An investment in the Fund could lose money over short or even long periods.

Nondiversified rr_RiskNondiversifiedStatus

The Fund is considered nondiversified, which means that it may invest a greater percentage of its assets in the securities of particular issuers as compared with other mutual funds.
Not Insured Depository Institution rr_RiskNotInsuredDepositoryInstitution

An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
Bar Chart and Performance Table rr_BarChartAndPerformanceTableHeading Annual Total Returns
Performance Information Illustrates Variability of Returns rr_PerformanceInformationIllustratesVariabilityOfReturns

The following bar chart and table are intended to help you understand the risks of investing in the Fund.
Performance Availability Phone rr_PerformanceAvailabilityPhone

800-662-7447
Performance Availability Website Address rr_PerformanceAvailabilityWebSiteAddress

vanguard.com/performance

Past Performance Does Not Indiciate Future Returns rr_PerformancePastDoesNotIndicateFuture

Keep in mind that the Fund's past performance (before and after taxes) does not indicate how the Fund will perform in the future.

Bar Chart rr_BarChartHeading Annual Total Returns - Vanguard New Jersey Long-Term Tax-Exempt Fund Investor Shares
Bar Chart Narrative rr_BarChartNarrativeTextBlock

The following bar chart and table are intended to help you understand the risks of investing in the Fund. The bar chart shows how the performance of the Fund's Investor Shares has varied from one calendar year to another over the periods shown. The table shows how the average annual total returns of the share classes presented compare with those of relevant market indexes, which have investment characteristics similar to those of the Fund. Keep in mind that the Fund's past performance (before and after taxes) does not indicate how the Fund will perform in the future. Updated performance information is available on our website at vanguard.com/performance or by calling Vanguard toll-free at 800-662-7447.
Bar Chart Closing rr_BarChartClosingTextBlock

During the periods shown in the bar chart, the highest return for a calendar quarter was 6.98% (quarter ended September 30, 2009 ), and the lowest return for a quarter was -4.38% (quarter ended December 31, 2010 ).
Highest Quarterly Return Label rr_HighestQuarterlyReturnLabel (quarter ended September 30, 2009 )
Lowest Quarterly Return Label rr_LowestQuarterlyReturnLabel (quarter ended December 31, 2010 )
Bar Chart and Performance Table: rr_PerformanceTableHeading Average Annual Total Returns for Periods Ended December 31, 2011
Index No Deduction for Fees, Expenses, Taxes rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses, or taxes)
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate

When after-tax returns are calculated, it is assumed that the shareholder was in the highest individual federal marginal income tax bracket at the time of each distribution of income or capital gains or upon redemption.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred

After-tax returns are not relevant for a shareholder who holds fund shares in a tax-deferred account, such as an individual retirement account or a 401(k) plan.

One Class of After-Tax Shown rr_PerformanceTableOneClassOfAfterTaxShown

Please note that after-tax returns are shown only for the Investor Shares and may differ for each share class.

Performance Table Explains why after Tax Higher rr_PerformanceTableExplanationAfterTaxHigher

Also, figures captioned Return After Taxes on Distributions and Sale of Fund Shares will be higher than other figures for the same period if a capital loss occurs upon redemption and results in an assumed tax deduction for the shareholder.
Performance Table Closing rr_PerformanceTableClosingTextBlock

Actual after-tax returns depend on your tax situation and may differ from those shown in the preceding table. When after-tax returns are calculated, it is assumed that the shareholder was in the highest individual federal marginal income tax bracket at the time of each distribution of income or capital gains or upon redemption. State and local income taxes are not reflected in the calculations. Please note that after-tax returns are shown only for the Investor Shares and may differ for each share class. After-tax returns are not relevant for a shareholder who holds fund shares in a tax-deferred account, such as an individual retirement account or a 401(k) plan. Also, figures captioned Return After Taxes on Distributions and Sale of Fund Shares will be higher than other figures for the same period if a capital loss occurs upon redemption and results in an assumed tax deduction for the shareholder.
Vanguard New Jersey Long-Term Tax-Exempt Fund | Vanguard New Jersey Long-Term Tax-Exempt Fund - Investor Shares
  
Risk/Return: rr_RiskReturnAbstract  
Sales charge (load) imposed on purchases rr_MaximumCumulativeSalesChargeOverOfferingPrice none
Purchase Fee rr_MaximumCumulativeSalesChargeOverOther none
Sales charge (load) imposed on reinvested dividends rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther none
Redemption Fee rr_RedemptionFeeOverRedemption none
Account Service Fee (for fund account balances below $10,000) rr_MaximumAccountFee 20
Management Expenses rr_ManagementFeesOverAssets 0.16%
12b-1 Distribution Fee rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.04%
Total Annual Fund Operating Expenses rr_NetExpensesOverAssets 0.20%
1 YEAR rr_ExpenseExampleNoRedemptionYear01 20
3 YEAR rr_ExpenseExampleNoRedemptionYear03 64
5 YEAR rr_ExpenseExampleNoRedemptionYear05 113
10 YEAR rr_ExpenseExampleNoRedemptionYear10 255
Annual Return Inception Date rr_AnnualReturnInceptionDate Feb. 03, 1988
2002 rr_AnnualReturn2002 9.92%
2003 rr_AnnualReturn2003 5.17%
2004 rr_AnnualReturn2004 3.98%
2005 rr_AnnualReturn2005 2.85%
2006 rr_AnnualReturn2006 5.24%
2007 rr_AnnualReturn2007 2.86%
2008 rr_AnnualReturn2008 (3.05%)
2009 rr_AnnualReturn2009 11.76%
2010 rr_AnnualReturn2010 1.27%
2011 rr_AnnualReturn2011 9.96%
Bar Chart Highest Quarterly Return Date rr_BarChartHighestQuarterlyReturnDate Sep. 30, 2009
Bar Chart Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 6.98%
Bar Chart Lowest Quarter Return Date rr_BarChartLowestQuarterlyReturnDate Dec. 31, 2010
Bar Chart Lowest Quarter Return rr_BarChartLowestQuarterlyReturn (4.38%)
One Year rr_AverageAnnualReturnYear01 9.96%
Five Years rr_AverageAnnualReturnYear05 4.41%
Ten Years rr_AverageAnnualReturnYear10 4.91%
Inception Date rr_AverageAnnualReturnInceptionDate Feb. 03, 1988
Vanguard New Jersey Long-Term Tax-Exempt Fund | Vanguard New Jersey Long-Term Tax-Exempt Fund - Admiral Shares
  
Risk/Return: rr_RiskReturnAbstract  
Sales charge (load) imposed on purchases rr_MaximumCumulativeSalesChargeOverOfferingPrice none
Purchase Fee rr_MaximumCumulativeSalesChargeOverOther none
Sales charge (load) imposed on reinvested dividends rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther none
Redemption Fee rr_RedemptionFeeOverRedemption none
Account Service Fee (for fund account balances below $10,000) rr_MaximumAccountFee 20
Management Expenses rr_ManagementFeesOverAssets 0.10%
12b-1 Distribution Fee rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.02%
Total Annual Fund Operating Expenses rr_NetExpensesOverAssets 0.12%
1 YEAR rr_ExpenseExampleNoRedemptionYear01 12
3 YEAR rr_ExpenseExampleNoRedemptionYear03 39
5 YEAR rr_ExpenseExampleNoRedemptionYear05 68
10 YEAR rr_ExpenseExampleNoRedemptionYear10 154
One Year rr_AverageAnnualReturnYear01 10.04%
Five Years rr_AverageAnnualReturnYear05 4.49%
Ten Years rr_AverageAnnualReturnYear10 4.98%
Inception Date rr_AverageAnnualReturnInceptionDate May 14, 2001
Vanguard New Jersey Tax-Exempt Money Market Fund | Retail
  
Risk/Return: rr_RiskReturnAbstract  
Prospectus Date rr_ProspectusDate Mar. 28, 2012
Risk/Return rr_RiskReturnHeading Risk/Return
Investment objective: rr_ObjectiveHeading Investment Objective
Investment objective rr_ObjectivePrimaryTextBlock

The Fund seeks to provide current income that is exempt from both federal and New Jersey state personal income taxes while maintaining a stable net asset value of $1 per share. The Fund is intended for New Jersey state residents only.
Expenses Heading rr_ExpenseHeading Fees and Expenses
Fees and Expenses of the Fund rr_ExpenseNarrativeTextBlock

The following table describes the fees and expenses you may pay if you buy and hold shares of the Fund.
Shareholder Fees Caption rr_ShareholderFeesCaption Shareholder Fees (Fees paid directly from your investment)
Operating Expenses Caption rr_OperatingExpensesCaption Annual Fund Operating Expenses (Expenses that you pay each year as a percentage of the value of your investment)
EXAMPLE rr_ExpenseExampleHeading

Example
Expense Example, Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock

The following example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. It illustrates the hypothetical expenses that you would incur over various periods if you invest $10,000 in the Fund's shares. This example assumes that the Fund provides a return of 5% a year and that operating expenses remain as stated in the preceding table. The results apply whether or not you redeem your investment at the end of the given period. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Strategy: rr_StrategyHeading Primary Investment Policies
StrategyNarrative rr_StrategyNarrativeTextBlock

The Fund invests at least 80% of its assets in a variety of high-quality, short-term New Jersey state municipal securities whose income is exempt from federal and New Jersey state taxes. To be considered high-quality, a security generally must be rated in one of the two highest credit-quality categories for short-term securities by at least two nationally recognized statistical rating organizations (NRSROs) (or by one, if only one NRSRO has rated the security). If unrated, the security must be determined by Vanguard to be of quality equivalent to those in the two highest credit-quality categories for short-term securities. The Fund invests in securities with effective maturities of 397 days or less, maintains a dollar-weighted average maturity of 60 days or less, and maintains a dollar-weighted average life of 120 days or less.
Risk: rr_RiskHeading Primary Risks
Risk Narrative rr_RiskNarrativeTextBlock

The Fund is designed for investors with a low tolerance for risk; however, the Fund's performance could be hurt by:

State-specific risk, which is the chance that developments in New Jersey state will adversely affect the securities held by the Fund. Because the Fund invests primarily in securities issued by New Jersey state and its municipalities, it is more vulnerable to unfavorable developments in New Jersey state than are funds that invest in municipal securities of many states. Unfavorable developments in any economic sector may have far-reaching ramifications on the overall New Jersey state municipal market.

Income risk, which is the chance that the Fund's income will decline because of falling interest rates. Because the Fund's income is based on short-term interest rates-which can fluctuate significantly over short periods-income risk is expected to be high.

Credit risk, which is the chance that the issuer of a security will fail to pay interest and principal in a timely manner, or that negative perceptions of the issuer's ability to make such payments will cause the price of that security to decline. Credit risk should be very low for the Fund, because it invests primarily in securities that are considered to be of high quality.

Manager risk, which is the chance that poor security selection will cause the Fund to underperform relevant benchmarks or other funds with a similar investment objective.

Nondiversification risk, which is the chance that the Fund's performance may be hurt disproportionately by the poor performance of relatively few securities. The Fund is considered nondiversified, which means that it may invest a greater percentage of its assets in the securities of particular issuers as compared with other mutual funds.

An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. Although the Fund seeks to preserve the value of your investment at $1 per share, it is possible to lose money by investing in the Fund.
Nondiversified rr_RiskNondiversifiedStatus

The Fund is considered nondiversified, which means that it may invest a greater percentage of its assets in the securities of particular issuers as compared with other mutual funds.
Money Market Fund rr_RiskMoneyMarketFund

The Fund is designed for investors with a low tolerance for risk; however, the Fund's performance could be hurt by:
Not Insured Depository Institution rr_RiskNotInsuredDepositoryInstitution

An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. Although the Fund seeks to preserve the value of your investment at $1 per share, it is possible to lose money by investing in the Fund.
Bar Chart and Performance Table rr_BarChartAndPerformanceTableHeading Annual Total Returns
Performance Information Illustrates Variability of Returns rr_PerformanceInformationIllustratesVariabilityOfReturns

The following bar chart and table are intended to help you understand the risks of investing in the Fund.
Performance Availability Phone rr_PerformanceAvailabilityPhone

800-662-7447
Performance Availability Website Address rr_PerformanceAvailabilityWebSiteAddress

vanguard.com/performance

Past Performance Does Not Indiciate Future Returns rr_PerformancePastDoesNotIndicateFuture

Keep in mind that the Fund's past performance does not indicate how the Fund will perform in the future.
Bar Chart rr_BarChartHeading Annual Total Returns - Vanguard New Jersey Tax-Exempt Money Market Fund Investor Shares
Bar Chart Narrative rr_BarChartNarrativeTextBlock

The following bar chart and table are intended to help you understand the risks of investing in the Fund. The bar chart shows how the performance of the Fund has varied from one calendar year to another over the periods shown. The table shows how the average annual total returns compare with those of a comparative benchmark, which has investment characteristics similar to those of the Fund. Returns for the New Jersey Tax-Exempt Money Market Funds Average are derived from data provided by Lipper Inc. Keep in mind that the Fund's past performance does not indicate how the Fund will perform in the future. Updated performance information is available on our website at vanguard.com/performance or by calling Vanguard toll-free at 800-662-7447.
Bar Chart Closing rr_BarChartClosingTextBlock

During the periods shown in the bar chart, the highest return for a calendar quarter was 0.91% (quarter ended June 30, 2007 ), and the lowest return for a quarter was 0.00% (quarter ended December 31, 2011 ).
Highest Quarterly Return Label rr_HighestQuarterlyReturnLabel (quarter ended June 30, 2007 )
Lowest Quarterly Return Label rr_LowestQuarterlyReturnLabel (quarter ended December 31, 2011 )
Bar Chart and Performance Table: rr_PerformanceTableHeading Average Annual Total Returns for Periods Ended December 31, 2011
Index No Deduction for Fees, Expenses, Taxes rr_IndexNoDeductionForFeesExpensesTaxes   
Vanguard New Jersey Tax-Exempt Money Market Fund | Vanguard New Jersey Tax-Exempt Money Market Fund - Investor Shares
  
Risk/Return: rr_RiskReturnAbstract  
Sales charge (load) imposed on purchases rr_MaximumCumulativeSalesChargeOverOfferingPrice none
Purchase Fee rr_MaximumCumulativeSalesChargeOverOther none
Sales charge (load) imposed on reinvested dividends rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther none
Redemption Fee rr_RedemptionFeeOverRedemption none
Account Service Fee (for fund account balances below $10,000) rr_MaximumAccountFee 20
Management Expenses rr_ManagementFeesOverAssets 0.13%
12b-1 Distribution Fee rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.04%
Total Annual Fund Operating Expenses rr_NetExpensesOverAssets 0.17% [1]
1 YEAR rr_ExpenseExampleNoRedemptionYear01 17
3 YEAR rr_ExpenseExampleNoRedemptionYear03 55
5 YEAR rr_ExpenseExampleNoRedemptionYear05 96
10 YEAR rr_ExpenseExampleNoRedemptionYear10 217
Annual Return Inception Date rr_AnnualReturnInceptionDate Feb. 03, 1988
2002 rr_AnnualReturn2002 1.25%
2003 rr_AnnualReturn2003 0.86%
2004 rr_AnnualReturn2004 1.08%
2005 rr_AnnualReturn2005 2.29%
2006 rr_AnnualReturn2006 3.31%
2007 rr_AnnualReturn2007 3.57%
2008 rr_AnnualReturn2008 2.08%
2009 rr_AnnualReturn2009 0.37%
2010 rr_AnnualReturn2010 0.11%
2011 rr_AnnualReturn2011 0.05%
Bar Chart Highest Quarterly Return Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2007
Bar Chart Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 0.91%
Bar Chart Lowest Quarter Return Date rr_BarChartLowestQuarterlyReturnDate Dec. 31, 2011
Bar Chart Lowest Quarter Return rr_BarChartLowestQuarterlyReturn 0.00%
One Year rr_AverageAnnualReturnYear01 0.05%
Five Years rr_AverageAnnualReturnYear05 1.23%
Ten Years rr_AverageAnnualReturnYear10 1.49%
Inception Date rr_AverageAnnualReturnInceptionDate Feb. 03, 1988
New Jersey Tax-Exempt Money Market Funds Average | Vanguard New Jersey Tax-Exempt Money Market Fund | Vanguard New Jersey Tax-Exempt Money Market Fund - Investor Shares
  
Risk/Return: rr_RiskReturnAbstract  
One Year rr_AverageAnnualReturnYear01 0.01%
Five Years rr_AverageAnnualReturnYear05 1.00%
Ten Years rr_AverageAnnualReturnYear10 1.14%
Barclays Capital Municipal Bond Index | Vanguard New Jersey Long-Term Tax-Exempt Fund | Vanguard New Jersey Long-Term Tax-Exempt Fund - Investor Shares
  
Risk/Return: rr_RiskReturnAbstract  
One Year rr_AverageAnnualReturnYear01 10.70%
Five Years rr_AverageAnnualReturnYear05 5.22%
Ten Years rr_AverageAnnualReturnYear10 5.38%
Barclays Capital Municipal Bond Index | Vanguard New Jersey Long-Term Tax-Exempt Fund | Vanguard New Jersey Long-Term Tax-Exempt Fund - Admiral Shares
  
Risk/Return: rr_RiskReturnAbstract  
One Year rr_AverageAnnualReturnYear01 10.70%
Five Years rr_AverageAnnualReturnYear05 5.22%
Ten Years rr_AverageAnnualReturnYear10 5.38%
Barclays Capital NJ Municipal Bond Index | Vanguard New Jersey Long-Term Tax-Exempt Fund | Vanguard New Jersey Long-Term Tax-Exempt Fund - Investor Shares
  
Risk/Return: rr_RiskReturnAbstract  
One Year rr_AverageAnnualReturnYear01 10.60%
Five Years rr_AverageAnnualReturnYear05 5.02%
Ten Years rr_AverageAnnualReturnYear10 none
Barclays Capital NJ Municipal Bond Index | Vanguard New Jersey Long-Term Tax-Exempt Fund | Vanguard New Jersey Long-Term Tax-Exempt Fund - Admiral Shares
  
Risk/Return: rr_RiskReturnAbstract  
One Year rr_AverageAnnualReturnYear01 10.60%
Five Years rr_AverageAnnualReturnYear05 5.02%
Ten Years rr_AverageAnnualReturnYear10 none
Spliced NJ Long-Term Tax Exempt Index | Vanguard New Jersey Long-Term Tax-Exempt Fund | Vanguard New Jersey Long-Term Tax-Exempt Fund - Investor Shares
  
Risk/Return: rr_RiskReturnAbstract  
One Year rr_AverageAnnualReturnYear01 10.60%
Five Years rr_AverageAnnualReturnYear05 5.02%
Ten Years rr_AverageAnnualReturnYear10 5.54%
Spliced NJ Long-Term Tax Exempt Index | Vanguard New Jersey Long-Term Tax-Exempt Fund | Vanguard New Jersey Long-Term Tax-Exempt Fund - Admiral Shares
  
Risk/Return: rr_RiskReturnAbstract  
One Year rr_AverageAnnualReturnYear01 10.60%
Five Years rr_AverageAnnualReturnYear05 5.02%
Ten Years rr_AverageAnnualReturnYear10 5.54%
[1] Vanguard and the Fund's Board have voluntarily agreed to temporarily limit certain net operating expenses in excess of the Fund's daily yield so as to maintain a zero or positive yield for the Fund. Vanguard and the Fund's Board may terminate the temporary expense limitation at any time.