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Risk/Return: rr_RiskReturnAbstract  
Registrant Name dei_EntityRegistrantName VANGUARD NEW JERSEY TAX-FREE FUNDS
Prospectus Date rr_ProspectusDate Mar. 27, 2020
Retail | Vanguard New Jersey Municipal Money Market Fund  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading Vanguard New Jersey Municipal Money Market Fund
Objective [Heading] rr_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock

The Fund seeks to provide current income that is exempt from both federal and New Jersey personal income taxes while maintaining a stable net asset value of $1 per share. The Fund is intended for New Jersey residents only.
Expense [Heading] rr_ExpenseHeading Fees and Expenses
Expense Narrative [Text Block] 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 [Text] rr_ShareholderFeesCaption Shareholder Fees (Fees paid directly from your investment)
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual Fund Operating Expenses (Expenses that you pay each year as a percentage of the value of your investment)
Expense Example [Heading] 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 were to invest $10,000 in the Fund's shares. This example assumes that the Fund provides a return of 5% each year and that total annual fund operating expenses remain as stated in the preceding table. You would incur these hypothetical expenses whether or not you were to 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 [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock

Under normal circumstances, the Fund invests at least 80% of its assets in a variety of high-quality, short-term New Jersey municipal securities whose income is exempt from federal and New Jersey state taxes. To be considered high quality, a security must be determined by Vanguard to present minimal credit risk based in part on a consideration of maturity, portfolio diversification, portfolio liquidity, and credit quality. 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 [Heading] rr_RiskHeading Principal Risks
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock

The Fund is designed for investors with a low tolerance for risk; however, the Fund is subject to the following risks, which could affect the Fund's performance:

  • State-specific risk, which is the chance that developments in New Jersey, such as tax, legislative, or political changes, will adversely affect the securities held by the Fund or that are available for investment by the Fund. Because the Fund invests primarily in securities issued by New Jersey and its municipalities, it is more vulnerable to the credit risk and unfavorable developments in New Jersey 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 municipal market.
  • Credit risk, which is the chance that the issuer of a security will fail to pay interest or 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.
  • 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.
  • 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 diversified mutual funds.
  • Tax risk, which is the chance that all or a portion of the tax-exempt income from municipal bonds held by the Fund will be declared taxable, possibly with retroactive effect, because of unfavorable changes in tax laws, adverse interpretations by the Internal Revenue Service or state or local tax authorities, or noncompliant conduct of a bond issuer.
  • Derivatives risk. The Fund may invest in structured products such as tender option bonds and long-term municipal securities combined with a demand feature (e.g., variable rate demand notes or VRDNs), which may involve risks different from, and possibly greater than, those of investments directly in the underlying securities or assets.

You could lose money by investing in the Fund. Although the Fund seeks to preserve the value of your investment at $1.00 per share, it cannot guarantee it will do so. The Fund may impose a fee upon sale of your shares or may temporarily suspend your ability to sell shares if the Fund's liquidity falls below required minimums because of market conditions or other factors. An investment in the Fund is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. The Fund's sponsor has no legal obligation to provide financial support to the Fund, and you should not expect that the sponsor will provide financial support to the Fund at any time.

Risk Lose Money [Text] rr_RiskLoseMoney You could lose money by investing in the Fund.
Risk Money Market Fund May Not Preserve Dollar [Text] rr_RiskMoneyMarketFundMayNotPreserveDollar Although the Fund seeks to preserve the value of your investment at $1.00 per share, it cannot guarantee it will do so.
Risk Money Market Fund May Impose Fees Or Suspend Sales [Text] rr_RiskMoneyMarketFundMayImposeFeesOrSuspendSales The Fund may impose a fee upon sale of your shares or may temporarily suspend your ability to sell shares if the Fund's liquidity falls below required minimums because of market conditions or other factors.
Risk Not Insured [Text] rr_RiskNotInsured An investment in the Fund is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
Risk Money Market Fund Sponsor May Not Provide Support [Text] rr_RiskMoneyMarketFundSponsorMayNotProvideSupport The Fund's sponsor has no legal obligation to provide financial support to the Fund, and you should not expect that the sponsor will provide financial support to the Fund at any time.
Risk Nondiversified Status [Text] rr_RiskNondiversifiedStatus 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 diversified mutual funds.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Annual Total Returns
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock

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 of the Fund compare with those of comparative benchmarks, which have investment characteristics similar to those of the Fund. The Spliced New Jersey Tax-Exempt Money Market Funds Average reflects the performance of the New Jersey Tax-Exempt Money Market Funds Average through August 31, 2013, and the Other States Tax-Exempt Money Market Funds Average thereafter. Returns for the benchmarks shown are derived from data provided by Lipper, a Thomson Reuters Company. 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.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns 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 of the Fund compare with those of comparative benchmarks, which have investment characteristics similar to those of the Fund.
Performance Availability Phone [Text] rr_PerformanceAvailabilityPhone 800-662-7447
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress vanguard.com/performance
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture Keep in mind that the Fund's past performance does not indicate how the Fund will perform in the future.
Bar Chart [Heading] rr_BarChartHeading Annual Total Returns — Vanguard New Jersey Municipal Money Market Fund Investor Shares
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock

During the periods shown in the bar chart, the highest and lowest returns for a calendar quarter were:

Total Return Quarter
Highest 0.37% June 30, 2019
Lowest 0.00%* March 31, 2015

Performance Table Heading rr_PerformanceTableHeading Average Annual Total Returns for Periods Ended December 31, 2019
Retail | Vanguard New Jersey Municipal Money Market Fund | Investor Shares  
Risk/Return: rr_RiskReturnAbstract  
Purchase Fee rr_MaximumCumulativeSalesChargeOverOther none
Sales Charge (Load) Imposed on Purchases rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Sales Charge (Load) Imposed on Reinvested Dividends rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther none
Redemption Fee rr_RedemptionFeeOverRedemption none
Account Service Fee Per Year (for certain fund account balances below $10,000) rr_MaximumAccountFee $ 20
Management Fees rr_ManagementFeesOverAssets 0.14%
12b-1 Distribution Fee rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.02%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.16%
1 Year rr_ExpenseExampleYear01 $ 16
3 Years rr_ExpenseExampleYear03 52
5 Years rr_ExpenseExampleYear05 90
10 Years rr_ExpenseExampleYear10 $ 205
2010 rr_AnnualReturn2010 0.11%
2011 rr_AnnualReturn2011 0.05%
2012 rr_AnnualReturn2012 0.04%
2013 rr_AnnualReturn2013 0.01%
2014 rr_AnnualReturn2014 0.01%
2015 rr_AnnualReturn2015 0.01%
2016 rr_AnnualReturn2016 0.28%
2017 rr_AnnualReturn2017 0.68%
2018 rr_AnnualReturn2018 1.25%
2019 rr_AnnualReturn2019 1.27%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Highest
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2019
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 0.37%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Lowest
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2015
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn none [1]
1 Year rr_AverageAnnualReturnYear01 1.27%
5 Years rr_AverageAnnualReturnYear05 0.70%
10 Years rr_AverageAnnualReturnYear10 0.37%
Retail | Vanguard New Jersey Municipal Money Market Fund | Other States Tax-Exempt Money Market Funds Average  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 1.06%
5 Years rr_AverageAnnualReturnYear05 0.50%
10 Years rr_AverageAnnualReturnYear10 0.25%
Retail | Vanguard New Jersey Municipal Money Market Fund | Spliced New Jersey Tax-Exempt Money Market Funds Average  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 1.06%
5 Years rr_AverageAnnualReturnYear05 0.50%
10 Years rr_AverageAnnualReturnYear10 0.25%
[1] 0.00%