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Risk/Return: rr_RiskReturnAbstract  
Registrant Name dei_EntityRegistrantName PRUDENTIAL JENNISON BLEND FUND, INC.
Prospectus Date rr_ProspectusDate Oct. 31, 2013
Prudential Jennison Blend Fund, Inc.
  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading Prudential Jennison Blend Fund, Inc.

FUND SUMMARY
Objective [Heading] rr_ObjectiveHeading INVESTMENT OBJECTIVE
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The Fund's investment objective is long-term growth of capital.
Expense [Heading] rr_ExpenseHeading FUND FEES AND EXPENSES
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock The tables below describe the sales charges, fees and expenses that you may pay if you buy and hold shares of the Fund. You may qualify for sales charge discounts if you and an eligible group of investors purchase, or agree to purchase in the future, $25,000 or more in shares of the Fund or other funds in the Prudential Investments family of funds. More information about these discounts is available from your financial professional and is explained in Reducing or Waiving Class A's Initial Sales Charge on page 21 of the Fund's Prospectus and in Rights of Accumulation on page 40 of the Fund's Statement of Additional Information (SAI).
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)
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover.
Portfolio Turnover [Text Block] 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 higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the example, affect the Fund's performance. During the Fund's most recent fiscal year, the Fund's portfolio turnover rate was 73% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 73.00%
Expense Breakpoint Discounts [Text] rr_ExpenseBreakpointDiscounts You may qualify for sales charge discounts if you and an eligible group of investors purchase, or agree to purchase in the future, $25,000 or more in shares of the Fund or other funds in the Prudential Investments family of funds.
Expense Breakpoint, Minimum Investment Required [Amount] rr_ExpenseBreakpointMinimumInvestmentRequiredAmount $ 25,000
Expense Example [Heading] rr_ExpenseExampleHeading Example.
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock The following hypothetical example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. It assumes that you invest $10,000 in the Fund for the time periods indicated and then, except as indicated, redeem all your shares at the end of those periods. It assumes a 5% return on your investment each year, that the Fund's operating expenses remain the same and that all dividends and distributions are reinvested. Your actual costs may be higher or lower.
Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption If Shares Are Redeemed
Expense Example, No Redemption, By Year, Caption [Text] rr_ExpenseExampleNoRedemptionByYearCaption If Shares Are Not Redeemed
Strategy [Heading] rr_StrategyHeading INVESTMENTS, RISKS AND PERFORMANCE

Principal Investment Strategies.
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock The Fund normally invests at least 80% of its investable assets in equity and equity-related securities. The Fund may invest in securities of issuers of any market capitalization size. In deciding which securities to buy, the Fund's portfolio managers use a blend of investment styles. That is, they invest in equity and equity-related securities from traditionally growth and value areas, as well as stocks exhibiting characteristics of both. The Fund's portfolio managers use quantitative analytics to complement their fundamental investment process, and to provide additional investment insights on which to make investment decisions from time to time. In addition to common stock, the equity-related securities that the Fund may invest in include, but are not limited to, preferred stock and convertible securities.

The term “investable assets” refers to the Fund's net assets plus any borrowings for investment purposes. The Fund's investable assets will be less than its total assets to the extent that it has borrowed money for non-investment purposes, such as to meet anticipated redemptions. While we make every effort to achieve our objective, we can't guarantee success.
Risk [Heading] rr_RiskHeading Principal Risks of Investing in the Fund.
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock All investments have risks to some degree. Please remember that an investment in the Fund is not guaranteed to achieve its investment objective; is not a deposit with a bank; is not insured, endorsed or guaranteed by the Federal Deposit Insurance Corporation or any other government agency; and is subject to investment risks, including possible loss of your original investment.

Recent Market Events. The financial crisis that began in 2008 has caused a significant decline in the value and liquidity of many securities. In response to the crisis, the U.S. and other governments and U.S. and foreign central banks have taken steps to support financial markets. The withdrawal of this support, failure of efforts in response to the crisis, or investor perception that such efforts are not succeeding could negatively affect financial markets generally as well as the value and liquidity of certain securities. In addition, policy and legislative changes in the United States and other countries are changing many aspects of financial regulation. The impact of these changes on the markets, and the practical implications for market participants, may not be fully known for some time.

Risk of Increase in Expenses. Your actual cost of investing in the Fund may be higher than the expenses shown in the expense table for a variety of reasons. For example, expense ratios may be higher than those shown if average net assets decrease. Net assets are more likely to decrease and Fund expense ratios are more likely to increase when markets are volatile.

Equity and Equity-Related Securities Risks. The value of a particular security could go down and you could lose money. In addition to an individual security losing value, the value of the equity markets or a sector in which the Fund invests could go down. The Fund's holdings can vary significantly from broad market indexes and the performance of the Fund can deviate from the performance of these indexes. Different parts of a market can react differently to adverse issuer, market, regulatory, political and economic developments.

The Fund may invest in companies that reinvest their earnings rather than distribute them to shareholders. To the extent the Fund does invest in such companies, the Fund is not likely to receive significant dividend income on its portfolio securities.

Market Risk. The securities markets are volatile and the market prices of the Fund's securities may decline. Securities fluctuate in price based on changes in an issuer's financial condition and overall market and economic conditions. If the market prices of the securities owned by the Fund fall, the value of your investment in the Fund will decline.

Market Capitalization Risk. The Fund may invest in companies of any market capitalization. Generally, the stock prices of small- and medium-sized companies are less stable than the prices of large company stocks and may present greater risks. In exchange for the potentially lower risks of investing in large capitalization companies, the Fund's value may not rise as much as the value of funds that emphasize smaller capitalization companies. Large capitalization companies as a group could fall out of favor with the market, causing the Fund to underperform investments that focus on smaller capitalized companies.

Risks of Small and Medium Sized Companies. Small and medium capitalization companies usually offer a smaller range of products and services than larger companies. Smaller companies may also have limited financial resources and may lack management depth. As a result, their prices may fluctuate more than the stocks of larger, more established companies.

Portfolio Turnover Risk. The length of time the Fund has held a particular security is not generally a consideration in investment decisions. Under certain market conditions, the Fund's turnover rate may be higher than that of other mutual funds. Portfolio turnover generally involves some expense to the Fund, including brokerage commissions or dealer mark-ups and other transaction costs on the sale of securities and reinvestment in other securities. These transactions may result in realization of taxable capital gains. The trading costs and tax effects associated with portfolio turnover may adversely affect the Fund's investment performance.

For more information on the risks of investing in this Fund, including risks of investing in foreign securities, please see How the Fund Invests—Investment Risks in the Prospectus and Investment Risks and Considerations in the SAI.
Risk Lose Money [Text] rr_RiskLoseMoney and is subject to investment risks, including possible loss of your original investment.
Risk Not Insured Depository Institution [Text] rr_RiskNotInsuredDepositoryInstitution Please remember that an investment in the Fund is not guaranteed to achieve its investment objective; is not a deposit with a bank; is not insured, endorsed or guaranteed by the Federal Deposit Insurance Corporation or any other government agency;
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading The Fund's Past Performance.
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock The following bar chart shows the Fund's performance for the indicated share class for each full calendar year of operations or for the last 10 calendar years, whichever is shorter. The bar chart and Average Annual Total Returns table demonstrate the risk of investing in the Fund by showing how returns can change from year to year and by showing how the Fund's average annual total returns for the share class compare with a broad-based securities market index and a group of similar mutual funds.

Past performance (before and after taxes) does not mean that the Fund will achieve similar results in the future. Updated Fund performance information is available online at www.prudentialfunds.com.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The bar chart and Average Annual Total Returns table demonstrate the risk of investing in the Fund by showing how returns can change from year to year and by showing how the Fund's average annual total returns for the share class compare with a broad-based securities market index and a group of similar mutual funds.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.prudentialfunds.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture Past performance (before and after taxes) does not mean that the Fund will achieve similar results in the future.
Bar Chart [Heading] rr_BarChartHeading Annual Total Returns (Class A Shares)1
Bar Chart Does Not Reflect Sales Loads [Text] rr_BarChartDoesNotReflectSalesLoads These annual total returns do not include deductions for sales charges. If the sales charges were included, the annual total returns would be lower than those shown.
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
Best Quarter: Worst Quarter:
17.97% 2 nd Quarter 2009 -23.92% 4 th Quarter 2008
Performance Table Heading rr_PerformanceTableHeading Average Annual Total Returns % (including sales charges) (as of 12-31-12)
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate After-tax returns are calculated using the highest historical individual federal marginal income tax rates and do not reflect the impact of state and local taxes.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred After-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts.
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown After-tax returns are shown only for Class A Shares. After-tax returns for other classes will vary due to differing sales charges and expenses.
Performance Table Narrative rr_PerformanceTableNarrativeTextBlock ° After-tax returns are calculated using the highest historical individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor's tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. After-tax returns are shown only for Class A Shares. After-tax returns for other classes will vary due to differing sales charges and expenses.
Prudential Jennison Blend Fund, Inc. | Class A
  
Risk/Return: rr_RiskReturnAbstract  
Maximum sales charge (load) imposed on purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 5.50%
Maximum deferred sales charge (load) (as a percentage of the lower of original purchase price or sale proceeds) rr_MaximumDeferredSalesChargeOverOther 1.00%
Maximum sales charge (load) imposed on reinvested dividends and other distributions rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther none
Redemption fee rr_RedemptionFeeOverRedemption none
Exchange fee rr_ExchangeFeeOverRedemption none
Maximum account fee (accounts under $10,000) rr_MaximumAccountFee 15
Management fees rr_ManagementFeesOverAssets 0.49%
+ Distribution and service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.30%
+ Other expenses rr_OtherExpensesOverAssets 0.18%
= Total annual Fund operating expenses rr_ExpensesOverAssets 0.97%
1 Year rr_ExpenseExampleYear01 644
3 Years rr_ExpenseExampleYear03 842
5 Years rr_ExpenseExampleYear05 1,057
10 Years rr_ExpenseExampleYear10 1,674
1 Year rr_ExpenseExampleNoRedemptionYear01 644
3 Years rr_ExpenseExampleNoRedemptionYear03 842
5 Years rr_ExpenseExampleNoRedemptionYear05 1,057
10 Years rr_ExpenseExampleNoRedemptionYear10 1,674
2003 rr_AnnualReturn2003 31.45% [1]
2004 rr_AnnualReturn2004 9.44% [1]
2005 rr_AnnualReturn2005 17.66% [1]
2006 rr_AnnualReturn2006 11.70% [1]
2007 rr_AnnualReturn2007 9.73% [1]
2008 rr_AnnualReturn2008 (41.11%) [1]
2009 rr_AnnualReturn2009 42.60% [1]
2010 rr_AnnualReturn2010 14.90% [1]
2011 rr_AnnualReturn2011 (4.44%) [1]
2012 rr_AnnualReturn2012 12.84% [1]
Year to Date Return, Label rr_YearToDateReturnLabel The total return for Class A Shares from January 1, 2013 to September 30, 2013
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Sep. 30, 2013
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn 22.94%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best Quarter:
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2009
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 17.97%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst Quarter:
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Dec. 31, 2008
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (23.92%)
One Year rr_AverageAnnualReturnYear01 6.63%
Five Years rr_AverageAnnualReturnYear05 (0.34%)
Ten Years rr_AverageAnnualReturnYear10 7.39%
Prudential Jennison Blend Fund, Inc. | Class B
  
Risk/Return: rr_RiskReturnAbstract  
Maximum sales charge (load) imposed on purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum deferred sales charge (load) (as a percentage of the lower of original purchase price or sale proceeds) rr_MaximumDeferredSalesChargeOverOther 5.00%
Maximum sales charge (load) imposed on reinvested dividends and other distributions rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther none
Redemption fee rr_RedemptionFeeOverRedemption none
Exchange fee rr_ExchangeFeeOverRedemption none
Maximum account fee (accounts under $10,000) rr_MaximumAccountFee 15
Management fees rr_ManagementFeesOverAssets 0.49%
+ Distribution and service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 1.00%
+ Other expenses rr_OtherExpensesOverAssets 0.18%
= Total annual Fund operating expenses rr_ExpensesOverAssets 1.67%
1 Year rr_ExpenseExampleYear01 670
3 Years rr_ExpenseExampleYear03 826
5 Years rr_ExpenseExampleYear05 1,007
10 Years rr_ExpenseExampleYear10 1,703
1 Year rr_ExpenseExampleNoRedemptionYear01 170
3 Years rr_ExpenseExampleNoRedemptionYear03 526
5 Years rr_ExpenseExampleNoRedemptionYear05 907
10 Years rr_ExpenseExampleNoRedemptionYear10 1,703
One Year rr_AverageAnnualReturnYear01 7.13%
Five Years rr_AverageAnnualReturnYear05 (0.10%)
Ten Years rr_AverageAnnualReturnYear10 7.21%
Prudential Jennison Blend Fund, Inc. | Class C
  
Risk/Return: rr_RiskReturnAbstract  
Maximum sales charge (load) imposed on purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum deferred sales charge (load) (as a percentage of the lower of original purchase price or sale proceeds) rr_MaximumDeferredSalesChargeOverOther 1.00%
Maximum sales charge (load) imposed on reinvested dividends and other distributions rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther none
Redemption fee rr_RedemptionFeeOverRedemption none
Exchange fee rr_ExchangeFeeOverRedemption none
Maximum account fee (accounts under $10,000) rr_MaximumAccountFee 15
Management fees rr_ManagementFeesOverAssets 0.49%
+ Distribution and service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 1.00%
+ Other expenses rr_OtherExpensesOverAssets 0.18%
= Total annual Fund operating expenses rr_ExpensesOverAssets 1.67%
1 Year rr_ExpenseExampleYear01 270
3 Years rr_ExpenseExampleYear03 526
5 Years rr_ExpenseExampleYear05 907
10 Years rr_ExpenseExampleYear10 1,976
1 Year rr_ExpenseExampleNoRedemptionYear01 170
3 Years rr_ExpenseExampleNoRedemptionYear03 526
5 Years rr_ExpenseExampleNoRedemptionYear05 907
10 Years rr_ExpenseExampleNoRedemptionYear10 1,976
One Year rr_AverageAnnualReturnYear01 11.06%
Five Years rr_AverageAnnualReturnYear05 0.10%
Ten Years rr_AverageAnnualReturnYear10 7.22%
Prudential Jennison Blend Fund, Inc. | Class Z
  
Risk/Return: rr_RiskReturnAbstract  
Maximum sales charge (load) imposed on purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum deferred sales charge (load) (as a percentage of the lower of original purchase price or sale proceeds) rr_MaximumDeferredSalesChargeOverOther none
Maximum sales charge (load) imposed on reinvested dividends and other distributions rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther none
Redemption fee rr_RedemptionFeeOverRedemption none
Exchange fee rr_ExchangeFeeOverRedemption none
Maximum account fee (accounts under $10,000) rr_MaximumAccountFee none
Management fees rr_ManagementFeesOverAssets 0.49%
+ Distribution and service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
+ Other expenses rr_OtherExpensesOverAssets 0.18%
= Total annual Fund operating expenses rr_ExpensesOverAssets 0.67%
1 Year rr_ExpenseExampleYear01 68
3 Years rr_ExpenseExampleYear03 214
5 Years rr_ExpenseExampleYear05 373
10 Years rr_ExpenseExampleYear10 835
1 Year rr_ExpenseExampleNoRedemptionYear01 68
3 Years rr_ExpenseExampleNoRedemptionYear03 214
5 Years rr_ExpenseExampleNoRedemptionYear05 373
10 Years rr_ExpenseExampleNoRedemptionYear10 $ 835
One Year rr_AverageAnnualReturnYear01 13.24%
Five Years rr_AverageAnnualReturnYear05 1.11%
Ten Years rr_AverageAnnualReturnYear10 8.29%
Prudential Jennison Blend Fund, Inc. | Return After Taxes on Distributions | Class A
  
Risk/Return: rr_RiskReturnAbstract  
One Year rr_AverageAnnualReturnYear01 6.56%
Five Years rr_AverageAnnualReturnYear05 (0.53%)
Ten Years rr_AverageAnnualReturnYear10 6.98%
Prudential Jennison Blend Fund, Inc. | Return After Taxes on Distributions and Sale of Fund Shares | Class A
  
Risk/Return: rr_RiskReturnAbstract  
One Year rr_AverageAnnualReturnYear01 4.41%
Five Years rr_AverageAnnualReturnYear05 (0.36%)
Ten Years rr_AverageAnnualReturnYear10 6.43%
Prudential Jennison Blend Fund, Inc. | Russell 3000 Index (reflects no deduction for fees, expenses or taxes)
  
Risk/Return: rr_RiskReturnAbstract  
One Year rr_AverageAnnualReturnYear01 16.42%
Five Years rr_AverageAnnualReturnYear05 2.04%
Ten Years rr_AverageAnnualReturnYear10 7.68%
Prudential Jennison Blend Fund, Inc. | S&P 500 Index (reflects no deduction for fees, expenses or taxes)
  
Risk/Return: rr_RiskReturnAbstract  
One Year rr_AverageAnnualReturnYear01 15.99%
Five Years rr_AverageAnnualReturnYear05 1.66%
Ten Years rr_AverageAnnualReturnYear10 7.10%
Prudential Jennison Blend Fund, Inc. | Lipper Multi-Cap Core Funds Average (reflects no deduction for sales charges or taxes)
  
Risk/Return: rr_RiskReturnAbstract  
One Year rr_AverageAnnualReturnYear01 15.10%
Five Years rr_AverageAnnualReturnYear05 0.98%
Ten Years rr_AverageAnnualReturnYear10 7.42%
[1] These annual total returns do not include deductions for sales charges. If the sales charges were included, the annual total returns would be lower than those shown. Without the distribution and service (12b-1) fee waiver of 0.05%, the annual returns would have been lower, too. Effective May 1, 2008, this waiver was terminated. The total return for Class A Shares from January 1, 2013 to September 30, 2013 was 22.94%.