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Risk/Return: rr_RiskReturnAbstract  
Registrant Name dei_EntityRegistrantName PRUDENTIAL JENNISON SMALL CO FUND, INC.
Prospectus Date rr_ProspectusDate Nov. 27, 2013
PRUDENTIAL JENNISON SMALL COMPANY FUND, INC.
  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading PRUDENTIAL JENNISON SMALL COMPANY FUND, INC.

FUND SUMMARY
Objective [Heading] rr_ObjectiveHeading INVESTMENT OBJECTIVE
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The investment objective of the Fund is capital growth.
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 43 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)
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination January 31, 2015
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 50% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 50.00%
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
Expense Example Closing [Text Block] rr_ExpenseExampleClosingTextBlock ° For the period ending January 31, 2015, the distributor of the Fund has contractually agreed to reduce its distribution and service (12b-1) fees for Class R shares to .50% of the average daily net assets of Class R shares. This waiver may not be terminated prior to January 31, 2015, and may be renewed, modified or discontinued thereafter. The decision on whether to renew, modify or discontinue the waiver is subject to review by the distributor and the Fund's Board of Directors.
Strategy [Heading] rr_StrategyHeading INVESTMENTS, RISKS AND PERFORMANCE
Principal Investment Strategies.
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock We seek investments whose price will increase over time. We normally invest at least 80% of our investable assets in equity and equity-related securities of small, less well-known companies that the investment subadviser believes are relatively undervalued. In deciding which stocks to buy, we use a blend of both value and growth styles. We look for stocks of smaller, less well-known companies in a variety of different industries and sectors that we believe have attractive valuations, and should experience superior earnings growth on an intermediate term basis. “Investable assets” consist of 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.

We currently consider small companies to be those with a market capitalization less than the largest market capitalization of the Russell 2500 Index at the time of investment. The market capitalization within the index will vary, but as of October 31, 2013, the median market capitalization was approximately $970 million and the largest company by market capitalization was approximately $9.9 billion. The portfolio is diversified and typically will include stocks representing all of the sectors in the Russell 2500 Index. While we make every effort to achieve our objective, we cannot 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.

Market Events. The global financial crisis that began in 2008 has caused a significant decline in the value and liquidity of many securities and unprecedented volatility in the markets. In response to the crisis, the U.S. government and the Federal Reserve, as well as certain foreign governments and their central banks have taken steps to support financial markets, including by keeping interest rates low. 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.

This environment could make identifying investment risks and opportunities especially difficult for the subadviser, and whether or not the fund invests in securities of issuers located in or with significant exposure to countries experiencing economic and financial difficulties, the value and liquidity of the fund’s investments may be negatively affected. 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.

Small Company Risk. Small company stocks present above-average risks. This means that when stock prices decline overall, the Fund may decline more than a broad-based securities market index. These 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, stocks issued by smaller companies may be less liquid and fluctuate in value more than the stocks of larger, more established companies.

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.

Blend Style Risk. The Fund's blend investment style may subject the Fund to risks of both value and growth investing. The portion of the portfolio that makes investments pursuant to a growth strategy may be subject to above-average fluctuations as a result of seeking higher than average capital growth. The portion of the portfolio that makes investments pursuant to a value strategy may be subject to the risk that the market may not recognize a security's intrinsic value for a long time or that a stock judged to be undervalued may actually be appropriately priced. Historically, growth stocks have performed best during later stages of economic expansion and value stocks have performed best during periods of economic recovery. Therefore, both styles may over time go in and out of favor with the markets. At times when a style is out of favor, that portion of the portfolio may lag the other portion of the portfolio, which may cause the Fund to underperform the market in general, its benchmark and other mutual funds. Growth and value stocks have historically produced similar long-term results, though each category has periods when it outperforms the other.

Initial Public Offerings Risk. The Fund may participate in the initial public offering (IPO) market. The volume of IPOs and the levels at which the newly issued stocks trade in the secondary market are affected by the performance of the stock market overall. If IPOs are brought to the market, availability may be limited and if the Fund desires to acquire shares in such an offering, it may not be able to buy any shares at the offering price, or if it is able to buy shares, it may not be able to buy as many shares at the offering price as it would like. The prices of securities involved in IPOs are often subject to greater and more unpredictable price changes than more established stocks. Such unpredictability can have a dramatic impact on the Fund's performance (higher or lower) and any assumptions by investors based on the affected performance may be unwarranted. In addition, as Fund assets grow, the impact of IPO investments on performance will decline, which could reduce total returns.

Management Risk. The value of your investment may decrease if judgments by the subadviser about the attractiveness, value or market trends affecting a particular security, industry or sector or about market movements are incorrect.

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.

For more information on the risks of investing in this Fund, 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 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:
25.47%2nd Quarter 2003 -26.95%4th 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 historical highest 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 the indicated share class. 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 historical highest 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 the indicated share class. After-tax returns for other classes will vary due to differing sales charges and expenses.
PRUDENTIAL JENNISON SMALL COMPANY 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 0.67%
+ Distribution and service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.30%
+ Other expenses rr_OtherExpensesOverAssets 0.18%
= Total annual Fund operating expenses rr_ExpensesOverAssets 1.15%
– Fee Waiver or expense reimbursement rr_FeeWaiverOrReimbursementOverAssets none
= Net annual Fund operating expenses rr_NetExpensesOverAssets 1.15%
1 Year rr_ExpenseExampleYear01 661
3 Years rr_ExpenseExampleYear03 895
5 Years rr_ExpenseExampleYear05 1,148
10 Years rr_ExpenseExampleYear10 1,871
1 Year rr_ExpenseExampleNoRedemptionYear01 661
3 Years rr_ExpenseExampleNoRedemptionYear03 895
5 Years rr_ExpenseExampleNoRedemptionYear05 1,148
10 Years rr_ExpenseExampleNoRedemptionYear10 1,871
2003 rr_AnnualReturn2003 45.63% [1]
2004 rr_AnnualReturn2004 19.43% [1]
2005 rr_AnnualReturn2005 14.40% [1]
2006 rr_AnnualReturn2006 15.14% [1]
2007 rr_AnnualReturn2007 9.63% [1]
2008 rr_AnnualReturn2008 (38.10%) [1]
2009 rr_AnnualReturn2009 36.61% [1]
2010 rr_AnnualReturn2010 25.62% [1]
2011 rr_AnnualReturn2011 (1.97%) [1]
2012 rr_AnnualReturn2012 13.20% [1]
Year to Date Return, Label rr_YearToDateReturnLabel The 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 24.67%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best Quarter:
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2003
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 25.47%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst Quarter:
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Dec. 31, 2008
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (26.95%)
One Year rr_AverageAnnualReturnYear01 6.97%
Five Years rr_AverageAnnualReturnYear05 2.18%
Ten Years rr_AverageAnnualReturnYear10 10.84%
Since Inception rr_AverageAnnualReturnSinceInception   
PRUDENTIAL JENNISON SMALL COMPANY 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 0.67%
+ Distribution and service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 1.00%
+ Other expenses rr_OtherExpensesOverAssets 0.18%
= Total annual Fund operating expenses rr_ExpensesOverAssets 1.85%
– Fee Waiver or expense reimbursement rr_FeeWaiverOrReimbursementOverAssets none
= Net annual Fund operating expenses rr_NetExpensesOverAssets 1.85%
1 Year rr_ExpenseExampleYear01 688
3 Years rr_ExpenseExampleYear03 882
5 Years rr_ExpenseExampleYear05 1,101
10 Years rr_ExpenseExampleYear10 1,900
1 Year rr_ExpenseExampleNoRedemptionYear01 188
3 Years rr_ExpenseExampleNoRedemptionYear03 582
5 Years rr_ExpenseExampleNoRedemptionYear05 1,001
10 Years rr_ExpenseExampleNoRedemptionYear10 1,900
One Year rr_AverageAnnualReturnYear01 7.22%
Five Years rr_AverageAnnualReturnYear05 2.24%
Ten Years rr_AverageAnnualReturnYear10 10.55%
Since Inception rr_AverageAnnualReturnSinceInception   
PRUDENTIAL JENNISON SMALL COMPANY 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 0.67%
+ Distribution and service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 1.00%
+ Other expenses rr_OtherExpensesOverAssets 0.18%
= Total annual Fund operating expenses rr_ExpensesOverAssets 1.85%
– Fee Waiver or expense reimbursement rr_FeeWaiverOrReimbursementOverAssets none
= Net annual Fund operating expenses rr_NetExpensesOverAssets 1.85%
1 Year rr_ExpenseExampleYear01 288
3 Years rr_ExpenseExampleYear03 582
5 Years rr_ExpenseExampleYear05 1,001
10 Years rr_ExpenseExampleYear10 2,169
1 Year rr_ExpenseExampleNoRedemptionYear01 188
3 Years rr_ExpenseExampleNoRedemptionYear03 582
5 Years rr_ExpenseExampleNoRedemptionYear05 1,001
10 Years rr_ExpenseExampleNoRedemptionYear10 2,169
One Year rr_AverageAnnualReturnYear01 11.39%
Five Years rr_AverageAnnualReturnYear05 2.60%
Ten Years rr_AverageAnnualReturnYear10 10.65%
Since Inception rr_AverageAnnualReturnSinceInception   
PRUDENTIAL JENNISON SMALL COMPANY FUND, INC. | Class Q
  
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 0.67%
+ Distribution and service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
+ Other expenses rr_OtherExpensesOverAssets 0.03%
= Total annual Fund operating expenses rr_ExpensesOverAssets 0.70%
– Fee Waiver or expense reimbursement rr_FeeWaiverOrReimbursementOverAssets none
= Net annual Fund operating expenses rr_NetExpensesOverAssets 0.70%
1 Year rr_ExpenseExampleYear01 72
3 Years rr_ExpenseExampleYear03 224
5 Years rr_ExpenseExampleYear05 390
10 Years rr_ExpenseExampleYear10 871
1 Year rr_ExpenseExampleNoRedemptionYear01 72
3 Years rr_ExpenseExampleNoRedemptionYear03 224
5 Years rr_ExpenseExampleNoRedemptionYear05 390
10 Years rr_ExpenseExampleNoRedemptionYear10 871
One Year rr_AverageAnnualReturnYear01 13.84%
Five Years rr_AverageAnnualReturnYear05   
Ten Years rr_AverageAnnualReturnYear10   
Since Inception rr_AverageAnnualReturnSinceInception 7.95%
Inception Date rr_AverageAnnualReturnInceptionDate Nov. 29, 2010
PRUDENTIAL JENNISON SMALL COMPANY FUND, INC. | Class R
  
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 0.67%
+ Distribution and service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.75%
+ Other expenses rr_OtherExpensesOverAssets 0.18%
= Total annual Fund operating expenses rr_ExpensesOverAssets 1.60%
– Fee Waiver or expense reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.25%)
= Net annual Fund operating expenses rr_NetExpensesOverAssets 1.35%
1 Year rr_ExpenseExampleYear01 137
3 Years rr_ExpenseExampleYear03 481
5 Years rr_ExpenseExampleYear05 847
10 Years rr_ExpenseExampleYear10 1,879
1 Year rr_ExpenseExampleNoRedemptionYear01 137
3 Years rr_ExpenseExampleNoRedemptionYear03 481
5 Years rr_ExpenseExampleNoRedemptionYear05 847
10 Years rr_ExpenseExampleNoRedemptionYear10 1,879
One Year rr_AverageAnnualReturnYear01 12.95%
Five Years rr_AverageAnnualReturnYear05 3.09%
Ten Years rr_AverageAnnualReturnYear10   
Since Inception rr_AverageAnnualReturnSinceInception 8.25%
Inception Date rr_AverageAnnualReturnInceptionDate May 10, 2004
PRUDENTIAL JENNISON SMALL COMPANY FUND, INC. | Class X
  
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 6.00%
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 0.67%
+ Distribution and service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 1.00%
+ Other expenses rr_OtherExpensesOverAssets 0.18%
= Total annual Fund operating expenses rr_ExpensesOverAssets 1.85%
– Fee Waiver or expense reimbursement rr_FeeWaiverOrReimbursementOverAssets none
= Net annual Fund operating expenses rr_NetExpensesOverAssets 1.85%
1 Year rr_ExpenseExampleYear01 788
3 Years rr_ExpenseExampleYear03 982
5 Years rr_ExpenseExampleYear05 1,301
10 Years rr_ExpenseExampleYear10 2,169
1 Year rr_ExpenseExampleNoRedemptionYear01 188
3 Years rr_ExpenseExampleNoRedemptionYear03 582
5 Years rr_ExpenseExampleNoRedemptionYear05 1,001
10 Years rr_ExpenseExampleNoRedemptionYear10 2,169
One Year rr_AverageAnnualReturnYear01 6.15%
Five Years rr_AverageAnnualReturnYear05 1.96%
Ten Years rr_AverageAnnualReturnYear10   
Since Inception rr_AverageAnnualReturnSinceInception 3.23%
Inception Date rr_AverageAnnualReturnInceptionDate Mar. 02, 2007
PRUDENTIAL JENNISON SMALL COMPANY 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 0.67%
+ Distribution and service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
+ Other expenses rr_OtherExpensesOverAssets 0.18%
= Total annual Fund operating expenses rr_ExpensesOverAssets 0.85%
– Fee Waiver or expense reimbursement rr_FeeWaiverOrReimbursementOverAssets none
= Net annual Fund operating expenses rr_NetExpensesOverAssets 0.85%
1 Year rr_ExpenseExampleYear01 87
3 Years rr_ExpenseExampleYear03 271
5 Years rr_ExpenseExampleYear05 471
10 Years rr_ExpenseExampleYear10 1,049
1 Year rr_ExpenseExampleNoRedemptionYear01 87
3 Years rr_ExpenseExampleNoRedemptionYear03 271
5 Years rr_ExpenseExampleNoRedemptionYear05 471
10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,049
One Year rr_AverageAnnualReturnYear01 13.47%
Five Years rr_AverageAnnualReturnYear05 3.59%
Ten Years rr_AverageAnnualReturnYear10 11.71%
Since Inception rr_AverageAnnualReturnSinceInception   
PRUDENTIAL JENNISON SMALL COMPANY FUND, INC. | Return After Taxes on Distributions | Class A
  
Risk/Return: rr_RiskReturnAbstract  
One Year rr_AverageAnnualReturnYear01 6.90%
Five Years rr_AverageAnnualReturnYear05 1.88%
Ten Years rr_AverageAnnualReturnYear10 9.92%
Since Inception rr_AverageAnnualReturnSinceInception   
PRUDENTIAL JENNISON SMALL COMPANY FUND, INC. | Return After Taxes on Distribution and Sale of Fund Shares | Class A
  
Risk/Return: rr_RiskReturnAbstract  
One Year rr_AverageAnnualReturnYear01 4.63%
Five Years rr_AverageAnnualReturnYear05 1.73%
Ten Years rr_AverageAnnualReturnYear10 9.28%
Since Inception rr_AverageAnnualReturnSinceInception   
PRUDENTIAL JENNISON SMALL COMPANY FUND, INC. | Russell 2500 Index (reflects no deduction for fees, expenses or taxes)
  
Risk/Return: rr_RiskReturnAbstract  
One Year rr_AverageAnnualReturnYear01 17.88%
Five Years rr_AverageAnnualReturnYear05 4.34%
Ten Years rr_AverageAnnualReturnYear10 10.49%
Since Inception rr_AverageAnnualReturnSinceInception   
PRUDENTIAL JENNISON SMALL COMPANY FUND, INC. | S&P SmallCap 600 Index (reflects no deduction for fees, expenses or taxes)
  
Risk/Return: rr_RiskReturnAbstract  
One Year rr_AverageAnnualReturnYear01 16.33%
Five Years rr_AverageAnnualReturnYear05 5.14%
Ten Years rr_AverageAnnualReturnYear10 10.45%
Since Inception rr_AverageAnnualReturnSinceInception   
PRUDENTIAL JENNISON SMALL COMPANY FUND, INC. | Lipper Small-Cap Core Funds Average (reflects no deduction for sales charges or taxes)
  
Risk/Return: rr_RiskReturnAbstract  
One Year rr_AverageAnnualReturnYear01 14.74%
Five Years rr_AverageAnnualReturnYear05 3.28%
Ten Years rr_AverageAnnualReturnYear10 9.42%
Since Inception rr_AverageAnnualReturnSinceInception   
[1] These annual total returns do not include sales charges. If the sales charges were included, the annual total returns would be lower than those shown. The return for Class A shares from January 1, 2013 to September 30, 2013 was 24.67%.