0001193125-12-459766.txt : 20121108 0001193125-12-459766.hdr.sgml : 20121108 20121108124841 ACCESSION NUMBER: 0001193125-12-459766 CONFORMED SUBMISSION TYPE: 485BPOS PUBLIC DOCUMENT COUNT: 7 FILED AS OF DATE: 20121108 DATE AS OF CHANGE: 20121108 EFFECTIVENESS DATE: 20121108 FILER: COMPANY DATA: COMPANY CONFORMED NAME: PRUDENTIAL JENNISON MID-CAP GROWTH FUND, INC. CENTRAL INDEX KEY: 0001022624 IRS NUMBER: 000000000 STATE OF INCORPORATION: MD FISCAL YEAR END: 0831 FILING VALUES: FORM TYPE: 485BPOS SEC ACT: 1940 Act SEC FILE NUMBER: 811-07811 FILM NUMBER: 121189249 BUSINESS ADDRESS: STREET 1: GATEWAY CENTER THREE, 4TH FLOOR STREET 2: 100 MULBERRY STREET CITY: NEWARK STATE: NJ ZIP: 07102 BUSINESS PHONE: 9738026469 MAIL ADDRESS: STREET 1: GATEWAY CENTER THREE, 4TH FLOOR STREET 2: 100 MULBERRY STREET CITY: NEWARK STATE: NJ ZIP: 07102 FORMER COMPANY: FORMER CONFORMED NAME: JENNISON MID-CAP GROWTH FUND, INC. DATE OF NAME CHANGE: 20070418 FORMER COMPANY: FORMER CONFORMED NAME: JENNISON US EMERGING GROWTH FUND INC DATE OF NAME CHANGE: 20030716 FORMER COMPANY: FORMER CONFORMED NAME: PRUDENTIAL US EMERGING GROWTH FUND INC DATE OF NAME CHANGE: 20000925 FILER: COMPANY DATA: COMPANY CONFORMED NAME: PRUDENTIAL JENNISON MID-CAP GROWTH FUND, INC. CENTRAL INDEX KEY: 0001022624 IRS NUMBER: 000000000 STATE OF INCORPORATION: MD FISCAL YEAR END: 0831 FILING VALUES: FORM TYPE: 485BPOS SEC ACT: 1933 Act SEC FILE NUMBER: 333-11785 FILM NUMBER: 121189250 BUSINESS ADDRESS: STREET 1: GATEWAY CENTER THREE, 4TH FLOOR STREET 2: 100 MULBERRY STREET CITY: NEWARK STATE: NJ ZIP: 07102 BUSINESS PHONE: 9738026469 MAIL ADDRESS: STREET 1: GATEWAY CENTER THREE, 4TH FLOOR STREET 2: 100 MULBERRY STREET CITY: NEWARK STATE: NJ ZIP: 07102 FORMER COMPANY: FORMER CONFORMED NAME: JENNISON MID-CAP GROWTH FUND, INC. DATE OF NAME CHANGE: 20070418 FORMER COMPANY: FORMER CONFORMED NAME: JENNISON US EMERGING GROWTH FUND INC DATE OF NAME CHANGE: 20030716 FORMER COMPANY: FORMER CONFORMED NAME: PRUDENTIAL US EMERGING GROWTH FUND INC DATE OF NAME CHANGE: 20000925 0001022624 S000004657 PRUDENTIAL JENNISON MID-CAP GROWTH FUND, INC. C000012673 Class R JDERX C000012674 Class A PEEAX C000012675 Class B PEEBX C000012676 Class C PEGCX C000012677 Class Z PEGZX C000037847 Class New X C000037848 Class X C000096302 Class Q PJGQX 485BPOS 1 d431719d485bpos.htm PRUDENTIAL JENNISON MID-CAP GROWTH FUND, INC. Prudential Jennison Mid-Cap Growth Fund, Inc.

As filed with the Securities and Exchange Commission on November 8, 2012

Securities Act Registration No. 333-11785

Investment Company Act Registration No. 811-07811

 

 

 

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

 

 

FORM N-1A

REGISTRATION STATEMENT

UNDER

   THE SECURITIES ACT OF 1933   
   PRE-EFFECTIVE AMENDMENT NO.   
   POST-EFFECTIVE AMENDMENT NO. 31    x

and/or

REGISTRATION STATEMENT

UNDER

THE INVESTMENT COMPANY ACT OF 1940

   POST-EFFECTIVE AMENDMENT NO. 32    x

Check appropriate box or boxes

 

 

Prudential Jennison Mid-Cap Growth Fund, Inc.

Exact name of registrant as specified in charter

 

 

Gateway Center Three, 4th floor

100 Mulberry Street

Newark, New Jersey 07102

Address of Principal Executive Offices including Zip Code

(973) 367-7521

Registrant’s Telephone Number, Including Area Code

 

 

Deborah A. Docs

Gateway Center Three, 4th floor

100 Mulberry Street, 4th Floor

Newark, NJ 07102

Name and Address of Agent for Service

 

 

It is proposed that this filing will become effective:

  x immediately upon filing pursuant to paragraph (b)
  ¨ on (            ) pursuant to paragraph (b)
  ¨ 60 days after filing pursuant to paragraph (a)(1)
  ¨ on (            ) pursuant to paragraph (a)(1)
  ¨ 75 days after filing pursuant to paragraph (a)(2)
  ¨ on (date) pursuant to paragraph (a)(2) of Rule 485

If appropriate, check the following box:

  ¨ this post-effective amendment designates a new effective date for a previously filed post-effective amendment.

 

 

 


SIGNATURES

Pursuant to the requirements of the Securities Act and the Investment Company Act, the Fund certifies that it meets all of the requirements for effectiveness of this Post-Effective Amendment to the Registration Statement under Rule 485(b) under the Securities Act and has duly caused this Post-Effective Amendment to the Registration Statement to be signed on its behalf by the undersigned, duly authorized, in the City of Newark, and State of New Jersey, on the 8th day of November, 2012.

 

Prudential Jennison Mid-Cap Growth Fund, Inc.

*

Stuart S. Parker, President

Pursuant to the requirements of the Securities Act of 1933, this Post-Effective Amendment to the Registration Statement has been signed below by the following persons in the capacities and on the date indicated.

 

Signature

  

Title

 

Date

*

Kevin J. Bannon

   Director  

*

Scott E. Benjamin

   Director  

*

Linda W. Bynoe

   Director  

*

Michael S. Hyland

   Director  

*

Douglas H. McCorkindale

   Director  

*

Stephen P. Munn

   Director  

*

Stuart S. Parker

   Director and President, Principal Executive Officer  

*

Richard A. Redeker

   Director  

*

Robin B. Smith

   Director  

*

Stephen Stoneburn

   Director  

*

Grace C. Torres

   Treasurer, Principal Financial and Accounting Officer  

*By: /s/ Jonathan D. Shain

Jonathan D. Shain

   Attorney-in-Fact   November 8, 2012


POWER OF ATTORNEY

The undersigned Directors, Trustees and Officers of the Prudential Investments Mutual Funds, the Target Funds and The Prudential Variable Contract Accounts 2, 10 and 11 (collectively, the “Funds”), hereby constitute, appoint and authorize each of, Andrew French, Claudia DiGiacomo, Deborah A. Docs, Katherine P. Feld, Raymond O’Hara, Amanda Ryan, and Jonathan D. Shain, as true and lawful agents and attorneys-in-fact, to sign, execute and deliver on his or her behalf in the appropriate capacities indicated, any Registration Statements of the Funds on the appropriate forms, any and all amendments thereto (including pre- and post-effective amendments), and any and all supplements or other instruments in connection therewith, including Form N-PX, Forms 3, 4 and 5, as appropriate, to file the same, with all exhibits thereto, with the U.S. Securities and Exchange Commission (the “SEC”) and the securities regulators of appropriate states and territories, and generally to do all such things in his or her name and behalf in connection therewith as said attorney-in-fact deems necessary or appropriate to comply with the provisions of the Securities Act of 1933, section 16(a) of the Securities Exchange Act of 1934 and the Investment Company Act of 1940, all related requirements of the SEC and all requirements of appropriate states and territories. The undersigned do hereby give to said agents and attorneys-in-fact full power and authority to act in these premises, including, but not limited to, the power to appoint a substitute or substitutes to act hereunder with the same power and authority as said agents and attorneys-in-fact would have if personally acting. The undersigned do hereby approve, ratify and confirm all that said agents and attorneys-in-fact, or any substitute or substitutes, may do by virtue hereof.

 

/s/ Kevin J. Bannon

Kevin J. Bannon

    

/s/ Stuart S. Parker

Stuart S. Parker

/s/ Scott E. Benjamin

Scott E. Benjamin

    

/s/ Richard A. Redeker

Richard A. Redeker

/s/ Linda W. Bynoe

Linda W. Bynoe

    

/s/ Robin B. Smith

Robin B. Smith

/s/ Michael S. Hyland

Michael S. Hyland

    

/s/ Stephen Stoneburn

Stephen Stoneburn

/s/ Douglas H. McCorkindale

Douglas H. McCorkindale

    

/s/ Grace C. Torres

Grace C. Torres

/s/ Stephen P. Munn

Stephen P. Munn

    
Dated: June 6, 2012     


Exhibit Index

 

Exhibit No.

  

Description

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EX-101.DEF    XBRL Taxonomy Extension Definition Linkbase
EX-101.LAB    XBRL Taxonomy Extension Labels Linkbase
EX-101.PRE    XBRL Taxonomy Extension Presentation Linkbase
EX-101.INS 2 pjmgf-20121029.xml XBRL INSTANCE DOCUMENT 0001022624 pjmgf:S000004657Member 2011-11-01 2012-10-31 0001022624 pjmgf:S000004657Member pjmgf:C000012674Member 2011-11-01 2012-10-31 0001022624 pjmgf:S000004657Member pjmgf:C000012675Member 2011-11-01 2012-10-31 0001022624 pjmgf:S000004657Member pjmgf:C000012676Member 2011-11-01 2012-10-31 0001022624 pjmgf:S000004657Member pjmgf:C000096302Member 2011-11-01 2012-10-31 0001022624 pjmgf:S000004657Member pjmgf:C000012673Member 2011-11-01 2012-10-31 0001022624 pjmgf:S000004657Member pjmgf:C000037848Member 2011-11-01 2012-10-31 0001022624 pjmgf:S000004657Member pjmgf:C000012677Member 2011-11-01 2012-10-31 0001022624 2011-11-01 2012-10-31 0001022624 pjmgf:S000004657Member rr:AfterTaxesOnDistributionsAndSalesMember pjmgf:C000012674Member 2011-11-01 2012-10-31 0001022624 pjmgf:S000004657Member rr:AfterTaxesOnDistributionsMember pjmgf:C000012674Member 2011-11-01 2012-10-31 0001022624 pjmgf:S000004657Member pjmgf:RussellMidcapGrowthIndexMember 2011-11-01 2012-10-31 0001022624 pjmgf:S000004657Member pjmgf:RussellMidcapIndexMember 2011-11-01 2012-10-31 0001022624 pjmgf:S000004657Member pjmgf:LipperMidcapGrowthFundAverageMember 2011-11-01 2012-10-31 0001022624 pjmgf:S000004657Member pjmgf:LipperMultiCapGrowthFundsAverageMember 2011-11-01 2012-10-31 pure iso4217:USD <font style="FONT-FAMILY: Arial" size="2"><b>If Shares Are Redeemed</b></font> 1103 954 954 335 800 1103 1054 954 954 422 <font style="FONT-FAMILY: Arial" size="2"><b>Example.</b></font> <div style="display:none">~ http://www.prudentialfunds.com/role/ScheduleShareholderFeesPRUDENTIALJENNISONMID-CAPGROWTHFUND,INC. column period compact * ~</div> 2012-09-30 0.055 0 0 335 800 1254 422 0.4311 <font style="FONT-FAMILY: Arial" size="4"><b>PRUDENTIAL JENNISON MID-CAP GROWTH FUND, INC.</b></font> <font style="FONT-FAMILY: Arial" size="2"><b>Shareholder Fees (fees paid directly from your investment)</b></font> <font style="FONT-FAMILY: Arial" size="2">The Fund pays transaction costs, such as commissions, when it buys and sells securities (or &#8220;turns over&#8221; 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 49% of the average value of its portfolio.</font> <font style="FONT-FAMILY: Arial" size="2">www.prudentialfunds.com</font> <font style="FONT-FAMILY: Arial" size="2">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.</font> <font style="FONT-FAMILY: Arial" size="2">&#176; The distributor of the Fund has contractually agreed until December 31, 2013 to reduce its distribution and service (12b-1) fees applicable to Class R shares to .50% of the average daily net assets of Class R shares. This waiver may not be terminated by the distributor prior to December 31, 2013, 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.</font> <div style="display:none">~ http://www.prudentialfunds.com/role/ScheduleAnnualFundOperatingExpensesPRUDENTIALJENNISONMID-CAPGROWTHFUND,INC. column period compact * ~</div> 0.158 0 0 0 0 0 0 652 679 279 61 128 779 78 1773 1802 2073 750 1780 2073 942 2005-06-03 2006-06-12 PRUDENTIAL JENNISON MID-CAP GROWTH FUND, INC. <font style="FONT-FAMILY: Arial" size="2">The tables below describe the sales charges, fees and expenses that you may pay if you buy and hold shares of the Fund.<br/><br/>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 <i>Reducing or Waiving Class A's Initial Sales Charge</i> on page 20 of the Fund's Prospectus and in the Fund's Statement of Additional Information (SAI), in <i>Rights of Accumulation </i>on page 41.</font> <font style="FONT-FAMILY: Arial" size="2"><b>Annual Fund Operating Expenses % (expenses that you pay each year as a percentage of the value of your investment)</b></font> <font style="FONT-FAMILY: Arial" size="2">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.</font> <table style="border-left: black 1px solid; line-height: 10pt; width: 70%; border-collapse: collapse; font-family: Arial; empty-cells: show; margin-bottom: 15pt; font-size: 8pt; border-top: black 1px solid;" cellspacing="0" cellpadding="4" align="center"> <tr><td style="border-bottom: black 1px solid; border-right: black 1px solid;" valign="bottom" colspan="2" align="center">Best Quarter:</td> <td style="border-bottom: black 1px solid; border-right: black 1px solid;" valign="bottom" colspan="2" align="center">Worst Quarter:</td></tr> <tr><td style="border-bottom: black 1px solid; border-right: black 1px solid;" valign="top" align="center">25.30%</td> <td style="border-bottom: black 1px solid; border-right: black 1px solid;" valign="top" align="center">2nd Quarter 2003</td> <td style="border-bottom: black 1px solid; border-right: black 1px solid;" valign="top" align="center">-23.04%</td> <td style="border-bottom: black 1px solid; border-right: black 1px solid;" valign="top" align="center">4th Quarter 2008</td></tr></table> <font style="FONT-FAMILY: Arial" size="2">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.</font> <font style="FONT-FAMILY: Arial" size="2"><b>Average Annual Total Returns % (as of 12-31-11)</b></font> 25000 <font style="FONT-FAMILY: Arial" size="2">&#176; 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.</font> <div style="display:none">~ http://www.prudentialfunds.com/role/ScheduleAnnualTotalReturnsPRUDENTIALJENNISONMID-CAPGROWTHFUND,INC.BarChart column period compact * ~</div> 0 0 0 0 0 0 0 0.01 0.05 0.01 0 0 0.06 0 0.0076 0.0176 0.0151 0.006 0.0106 0 0 -0.0025 0 0 869 854 554 192 453 954 243 179 652 179 61 128 179 78 -0.3351 0.0211 0.0563 0.0563 0.0668 0.058 0.0509 0.0579 0.0529 0.0699 0.0436 0.0325 2012-08-31 <font style="FONT-FAMILY: Arial" size="3"><b>INVESTMENT OBJECTIVE</b></font> <font style="FONT-FAMILY: Arial" size="2"><b>If Shares Are Not Redeemed</b></font> <font style="FONT-FAMILY: Arial" size="3"><b>INVESTMENTS, RISKS AND PERFORMANCE</font></b><br/><br/><font style="FONT-FAMILY: Arial" size="2"><b>Principal Investment Strategies.</b></font> <font style="FONT-FAMILY: Arial" size="2">and is subject to investment risks, including possible loss of your original investment.</font> 2003-06-30 0.253 2008-12-31 <font style="FONT-FAMILY: Arial" size="2">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.</font> 485BPOS 2012-10-29 0 0 0 0 0 0 0 15 15 15 0 0 15 0 0.0056 0.0056 0.0056 0.0056 0.0056 0.0056 0.0056 0 0.01 0.0075 0 0.01 0.003 0.01 0.002 0.002 0.002 0.0004 0.002 0.002 0.002 0.0176 0.0176 0.0076 0.0176 0.0126 0.006 0.0176 0.0176 0.0106 1773 1802 2073 750 1780 2073 942 869 554 554 192 453 554 243 0.1932 0.1724 0.0947 0.1607 -0.3617 0.4057 0.1998 -0.0362 0.0042 0.0192 -0.0458 0.0242 -0.0351 -0.036 -0.0216 -0.0165 -0.0155 -0.043 -0.0359 0.0409 0.0426 0.0477 0.0762 0.0506 false <font style="FONT-FAMILY: Arial" size="2">The investment objective of the Fund is <b>long-term capital appreciation.</b></font> <font style="FONT-FAMILY: Arial" size="3"><b>FUND FEES AND EXPENSES</b></font> <font style="FONT-FAMILY: Arial" size="2"><b>Principal Risks of Investing in the Fund.</b></font> <font style="FONT-FAMILY: Arial" size="2"><b>Portfolio Turnover.</b></font> <font style="FONT-FAMILY: Arial" size="2">We normally invest at least 80% of the Fund's investable assets in equity and equity-related securities of medium-sized companies with the potential for above-average growth. In deciding which equities to buy, we use what is known as a growth investment style. This means we invest in companies that we believe could experience superior sales or earnings growth. &#8220;Investable assets&#8221; 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.</font><br/><br/><font style="FONT-FAMILY: Arial" size="2">The Fund will provide 60 days' prior written notice to shareholders of a change in its non-fundamental policy of investing at least 80% of its investable assets in the type of investment suggested by its name.</font><br/><br/><font style="FONT-FAMILY: Arial" size="2">While we make every effort to achieve our objective, we can't guarantee success.</font> <font style="FONT-FAMILY: Arial" size="2">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.</font><br/><br/><font style="FONT-FAMILY: Arial" size="2"><b>Recent Market Events.</b> The equity and debt capital markets in the United States and internationally have experienced unprecedented volatility. The financial crisis has caused a significant decline in the value and liquidity of many securities. This environment could make identifying investment risks and opportunities especially difficult for the investment subadviser. These market conditions may continue or get worse. In response to the crisis, the U.S. and other governments and the Federal Reserve and certain foreign central banks have taken steps to support financial markets. The withdrawal of this support could negatively affect the value and liquidity of certain securities. In addition, legislation recently enacted in the United States calls for changes in many aspects of financial regulation. The impact of the legislation on the markets, and the practical implications for market participants, may not be known for some time.</font><br/><br/><font style="FONT-FAMILY: Arial" size="2"><b>Risk of Increase in Expenses.</b> 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.</font><br/><br/><font style="FONT-FAMILY: Arial" size="2"><b>Equity Securities Risk. </b>There is the risk that the price of a particular stock the Fund owns could go down and you could lose money. In addition to an individual stock losing value, the value of the equity markets or a sector of them in which the Fund invests could go down. Different sectors of a market can react differently to adverse issuer, market, regulatory, political and economic developments.</font><br/><br/><font style="FONT-FAMILY: Arial" size="2"><b>Growth Style Risk. </b>The Fund's growth style may subject the Fund to above-average fluctuations as a result of seeking higher than average capital growth. Historically, growth stocks have performed best during later stages of economic expansion and value stocks have performed best during periods of economic recovery. Since the Fund follows a growth investment style, there is the risk that the growth investment style may be out of favor for a period of time. At times when the style is out of favor, the Fund may underperform the market in general, its benchmark and other mutual funds.</font><br/><br/><font style="FONT-FAMILY: Arial" size="2"><b>Management Risk. </b>Actively managed mutual funds are subject to management risk. The subadviser will apply investment techniques and risk analyses in making investment decisions for the Fund, but there can be no guarantee that these techniques will produce the desired results. Additionally, the securities selected by the subadviser may underperform the markets in general, the Fund's benchmark and other mutual funds with similar investment objectives.</font><br/><br/><font style="FONT-FAMILY: Arial" size="2"><b>Market Risk.</b> Your investment in Fund shares represents an indirect investment in the securities owned by the Fund. The value of these securities, like other investments, may move up or down, sometimes rapidly and unpredictably. Securities markets are volatile. Your Fund shares at any point in time may be worth less than what you invested, even after taking into account the reinvestment of Fund dividends and distributions. Regardless of how well an individual investment performs, if financial markets go down, you could lose money.</font><br/><br/><font style="FONT-FAMILY: Arial" size="2"><b>Initial Public Offerings Risk.</b> 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.</font><br/><br/><font style="FONT-FAMILY: Arial" size="2">For more information on the risks of investing in this Fund, including risks of investing in foreign securities, please see <i>How the Fund Invests&#8212;Investment Risks in the Prospectus and Investment Risks and Considerations</i> in the SAI.</font> <font style="FONT-FAMILY: Arial" size="2">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;</font> <font style="FONT-FAMILY: Arial" size="2"><b>The Fund's Past Performance.</b></font> <font style="FONT-FAMILY: Arial" size="2">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. </font><br/><br/><font style="FONT-FAMILY: Arial" size="2">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.</font> <font style="FONT-FAMILY: Arial" size="2">Past performance (before and after taxes) does not mean that the Fund will achieve similar results in the future.</font> <font style="FONT-FAMILY: Arial" size="2"><b>Annual Total Returns (Class A Shares)<sup>1</sup> <font style="FONT-FAMILY: Arial" size="2">Best Quarter:</font> <font style="FONT-FAMILY: Arial" size="2">Worst Quarter:</font> -0.2304 December 31, 2013 <font style="FONT-FAMILY: Arial" size="2">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.</font> <font style="FONT-FAMILY: Arial" size="2">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.</font> <font style="FONT-FAMILY: Arial" size="2">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.</font> <div style="display:none">~ http://www.prudentialfunds.com/role/ScheduleAverageAnnualTotalReturnsTransposedPRUDENTIALJENNISONMID-CAPGROWTHFUND,INC. column period compact * ~</div> <div style="display:none">~ http://www.prudentialfunds.com/role/ScheduleExpenseExampleTransposedPRUDENTIALJENNISONMIDCAPGROWTHFUNDINC column period compact * ~</div> <div style="display:none">~ http://www.prudentialfunds.com/role/ScheduleExpenseExampleNoRedemptionTransposedPRUDENTIALJENNISONMIDCAPGROWTHFUNDINC column period compact * ~</div> 0001022624 2012-10-31 2012-10-31 <font style="FONT-FAMILY: Arial" size="2">The total return for Class A shares from 1/1/12 to 9/30/12</font> 0 0 0 0 0 0 0 0.0381 0.053 0.0381 0.0379 0.0328 0.0244 0.0141 0.0219 0.0127 0.49 The Fund is compared to the Lipper Mid-Cap Growth Funds Performance Universe, although Lipper classifies the Fund in the Lipper Multi-Cap Growth Funds Performance Universe. The Lipper Mid-Cap Growth Funds Performance Universe is utilized because the Manager believes that the funds included in this Universe provide a more appropriate basis for Fund performance comparisons. 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. Without the distribution and service (12b-1) fee waiver of 0.05%, the annual returns would have been lower, too. Effective March 1, 2008 such waiver has been terminated. The total return for Class A shares from 1/1/12 to 9/30/12 was 15.80%. 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Label Element Value
Risk/Return: rr_RiskReturnAbstract  
Registrant Name dei_EntityRegistrantName PRUDENTIAL JENNISON MID-CAP GROWTH FUND, INC.
Prospectus Date rr_ProspectusDate Oct. 31, 2012
PRUDENTIAL JENNISON MID-CAP GROWTH FUND, INC.
 
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading PRUDENTIAL JENNISON MID-CAP GROWTH FUND, INC.
Objective [Heading] rr_ObjectiveHeading INVESTMENT OBJECTIVE
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The investment objective of the Fund is long-term capital appreciation.
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 20 of the Fund's Prospectus and in the Fund's Statement of Additional Information (SAI), in Rights of Accumulation on page 41.
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 December 31, 2013
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 49% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 49.00%
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 Footnotes [Text Block] rr_ExpenseExampleFootnotesTextBlock ° The distributor of the Fund has contractually agreed until December 31, 2013 to reduce its distribution and service (12b-1) fees applicable to Class R shares to .50% of the average daily net assets of Class R shares. This waiver may not be terminated by the distributor prior to December 31, 2013, 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 normally invest at least 80% of the Fund's investable assets in equity and equity-related securities of medium-sized companies with the potential for above-average growth. In deciding which equities to buy, we use what is known as a growth investment style. This means we invest in companies that we believe could experience superior sales or earnings growth. “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.

The Fund will provide 60 days' prior written notice to shareholders of a change in its non-fundamental policy of investing at least 80% of its investable assets in the type of investment suggested by its name.

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 equity and debt capital markets in the United States and internationally have experienced unprecedented volatility. The financial crisis has caused a significant decline in the value and liquidity of many securities. This environment could make identifying investment risks and opportunities especially difficult for the investment subadviser. These market conditions may continue or get worse. In response to the crisis, the U.S. and other governments and the Federal Reserve and certain foreign central banks have taken steps to support financial markets. The withdrawal of this support could negatively affect the value and liquidity of certain securities. In addition, legislation recently enacted in the United States calls for changes in many aspects of financial regulation. The impact of the legislation on the markets, and the practical implications for market participants, may not be 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 Securities Risk. There is the risk that the price of a particular stock the Fund owns could go down and you could lose money. In addition to an individual stock losing value, the value of the equity markets or a sector of them in which the Fund invests could go down. Different sectors of a market can react differently to adverse issuer, market, regulatory, political and economic developments.

Growth Style Risk. The Fund's growth style may subject the Fund to above-average fluctuations as a result of seeking higher than average capital growth. Historically, growth stocks have performed best during later stages of economic expansion and value stocks have performed best during periods of economic recovery. Since the Fund follows a growth investment style, there is the risk that the growth investment style may be out of favor for a period of time. At times when the style is out of favor, the Fund may underperform the market in general, its benchmark and other mutual funds.

Management Risk. Actively managed mutual funds are subject to management risk. The subadviser will apply investment techniques and risk analyses in making investment decisions for the Fund, but there can be no guarantee that these techniques will produce the desired results. Additionally, the securities selected by the subadviser may underperform the markets in general, the Fund's benchmark and other mutual funds with similar investment objectives.

Market Risk. Your investment in Fund shares represents an indirect investment in the securities owned by the Fund. The value of these securities, like other investments, may move up or down, sometimes rapidly and unpredictably. Securities markets are volatile. Your Fund shares at any point in time may be worth less than what you invested, even after taking into account the reinvestment of Fund dividends and distributions. Regardless of how well an individual investment performs, if financial markets go down, you could lose money.

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.

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 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:
25.30% 2nd Quarter 2003 -23.04% 4th Quarter 2008
Performance Table Heading rr_PerformanceTableHeading Average Annual Total Returns % (as of 12-31-11)
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 MID-CAP GROWTH 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 0.56%
+ Distribution and service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.30%
+ Other expenses rr_OtherExpensesOverAssets 0.20%
= Total annual Fund operating expenses rr_ExpensesOverAssets 1.06%
- Fee waiver or expense reimbursement rr_FeeWaiverOrReimbursementOverAssets none
= Net annual Fund operating expenses rr_NetExpensesOverAssets 1.06%
1 Year rr_ExpenseExampleYear01 652
3 Years rr_ExpenseExampleYear03 869
5 Years rr_ExpenseExampleYear05 1,103
10 Years rr_ExpenseExampleYear10 1,773
1 Year rr_ExpenseExampleNoRedemptionYear01 652
3 Years rr_ExpenseExampleNoRedemptionYear03 869
5 Years rr_ExpenseExampleNoRedemptionYear05 1,103
10 Years rr_ExpenseExampleNoRedemptionYear10 1,773
2002 rr_AnnualReturn2002 (33.51%) [1]
2003 rr_AnnualReturn2003 43.11% [1]
2004 rr_AnnualReturn2004 19.32% [1]
2005 rr_AnnualReturn2005 17.24% [1]
2006 rr_AnnualReturn2006 9.47% [1]
2007 rr_AnnualReturn2007 16.07% [1]
2008 rr_AnnualReturn2008 (36.17%) [1]
2009 rr_AnnualReturn2009 40.57% [1]
2010 rr_AnnualReturn2010 19.98% [1]
2011 rr_AnnualReturn2011 2.11% [1]
Year to Date Return, Label rr_YearToDateReturnLabel The total return for Class A shares from 1/1/12 to 9/30/12
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Sep. 30, 2012
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn 15.80%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best Quarter:
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2003
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 25.30%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst Quarter:
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Dec. 31, 2008
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (23.04%)
One Year rr_AverageAnnualReturnYear01 (3.51%)
Five Years rr_AverageAnnualReturnYear05 3.81%
Ten Years rr_AverageAnnualReturnYear10 5.80%
Since Inception rr_AverageAnnualReturnSinceInception   
PRUDENTIAL JENNISON MID-CAP GROWTH 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 0.56%
+ Distribution and service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 1.00%
+ Other expenses rr_OtherExpensesOverAssets 0.20%
= Total annual Fund operating expenses rr_ExpensesOverAssets 1.76%
- Fee waiver or expense reimbursement rr_FeeWaiverOrReimbursementOverAssets none
= Net annual Fund operating expenses rr_NetExpensesOverAssets 1.76%
1 Year rr_ExpenseExampleYear01 679
3 Years rr_ExpenseExampleYear03 854
5 Years rr_ExpenseExampleYear05 1,054
10 Years rr_ExpenseExampleYear10 1,802
1 Year rr_ExpenseExampleNoRedemptionYear01 179
3 Years rr_ExpenseExampleNoRedemptionYear03 554
5 Years rr_ExpenseExampleNoRedemptionYear05 954
10 Years rr_ExpenseExampleNoRedemptionYear10 1,802
One Year rr_AverageAnnualReturnYear01 (3.62%)
Five Years rr_AverageAnnualReturnYear05 4.09%
Ten Years rr_AverageAnnualReturnYear10 5.63%
Since Inception rr_AverageAnnualReturnSinceInception   
PRUDENTIAL JENNISON MID-CAP GROWTH 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 0.56%
+ Distribution and service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 1.00%
+ Other expenses rr_OtherExpensesOverAssets 0.20%
= Total annual Fund operating expenses rr_ExpensesOverAssets 1.76%
- Fee waiver or expense reimbursement rr_FeeWaiverOrReimbursementOverAssets none
= Net annual Fund operating expenses rr_NetExpensesOverAssets 1.76%
1 Year rr_ExpenseExampleYear01 279
3 Years rr_ExpenseExampleYear03 554
5 Years rr_ExpenseExampleYear05 954
10 Years rr_ExpenseExampleYear10 2,073
1 Year rr_ExpenseExampleNoRedemptionYear01 179
3 Years rr_ExpenseExampleNoRedemptionYear03 554
5 Years rr_ExpenseExampleNoRedemptionYear05 954
10 Years rr_ExpenseExampleNoRedemptionYear10 2,073
One Year rr_AverageAnnualReturnYear01 0.42%
Five Years rr_AverageAnnualReturnYear05 4.26%
Ten Years rr_AverageAnnualReturnYear10 5.63%
Since Inception rr_AverageAnnualReturnSinceInception   
PRUDENTIAL JENNISON MID-CAP GROWTH 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 0.56%
+ Distribution and service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
+ Other expenses rr_OtherExpensesOverAssets 0.04%
= Total annual Fund operating expenses rr_ExpensesOverAssets 0.60%
- Fee waiver or expense reimbursement rr_FeeWaiverOrReimbursementOverAssets none
= Net annual Fund operating expenses rr_NetExpensesOverAssets 0.60%
1 Year rr_ExpenseExampleYear01 61
3 Years rr_ExpenseExampleYear03 192
5 Years rr_ExpenseExampleYear05 335
10 Years rr_ExpenseExampleYear10 750
1 Year rr_ExpenseExampleNoRedemptionYear01 61
3 Years rr_ExpenseExampleNoRedemptionYear03 192
5 Years rr_ExpenseExampleNoRedemptionYear05 335
10 Years rr_ExpenseExampleNoRedemptionYear10 750
One Year rr_AverageAnnualReturnYear01   
Five Years rr_AverageAnnualReturnYear05   
Ten Years rr_AverageAnnualReturnYear10   
Since Inception rr_AverageAnnualReturnSinceInception   
PRUDENTIAL JENNISON MID-CAP GROWTH 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 0.56%
+ Distribution and service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.75%
+ Other expenses rr_OtherExpensesOverAssets 0.20%
= Total annual Fund operating expenses rr_ExpensesOverAssets 1.51%
- Fee waiver or expense reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.25%)
= Net annual Fund operating expenses rr_NetExpensesOverAssets 1.26%
1 Year rr_ExpenseExampleYear01 128
3 Years rr_ExpenseExampleYear03 453
5 Years rr_ExpenseExampleYear05 800
10 Years rr_ExpenseExampleYear10 1,780
1 Year rr_ExpenseExampleNoRedemptionYear01 128
3 Years rr_ExpenseExampleNoRedemptionYear03 453
5 Years rr_ExpenseExampleNoRedemptionYear05 800
10 Years rr_ExpenseExampleNoRedemptionYear10 1,780
One Year rr_AverageAnnualReturnYear01 1.92%
Five Years rr_AverageAnnualReturnYear05 4.77%
Ten Years rr_AverageAnnualReturnYear10   
Since Inception rr_AverageAnnualReturnSinceInception 7.62%
Inception Date rr_AverageAnnualReturnInceptionDate Jun. 03, 2005
PRUDENTIAL JENNISON MID-CAP GROWTH 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 0.56%
+ Distribution and service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 1.00%
+ Other expenses rr_OtherExpensesOverAssets 0.20%
= Total annual Fund operating expenses rr_ExpensesOverAssets 1.76%
- Fee waiver or expense reimbursement rr_FeeWaiverOrReimbursementOverAssets none
= Net annual Fund operating expenses rr_NetExpensesOverAssets 1.76%
1 Year rr_ExpenseExampleYear01 779
3 Years rr_ExpenseExampleYear03 954
5 Years rr_ExpenseExampleYear05 1,254
10 Years rr_ExpenseExampleYear10 2,073
1 Year rr_ExpenseExampleNoRedemptionYear01 179
3 Years rr_ExpenseExampleNoRedemptionYear03 554
5 Years rr_ExpenseExampleNoRedemptionYear05 954
10 Years rr_ExpenseExampleNoRedemptionYear10 2,073
One Year rr_AverageAnnualReturnYear01 (4.58%)
Five Years rr_AverageAnnualReturnYear05 3.81%
Ten Years rr_AverageAnnualReturnYear10   
Since Inception rr_AverageAnnualReturnSinceInception 5.06%
Inception Date rr_AverageAnnualReturnInceptionDate Jun. 12, 2006
PRUDENTIAL JENNISON MID-CAP GROWTH 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 0.56%
+ Distribution and service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
+ Other expenses rr_OtherExpensesOverAssets 0.20%
= Total annual Fund operating expenses rr_ExpensesOverAssets 0.76%
- Fee waiver or expense reimbursement rr_FeeWaiverOrReimbursementOverAssets none
= Net annual Fund operating expenses rr_NetExpensesOverAssets 0.76%
1 Year rr_ExpenseExampleYear01 78
3 Years rr_ExpenseExampleYear03 243
5 Years rr_ExpenseExampleYear05 422
10 Years rr_ExpenseExampleYear10 942
1 Year rr_ExpenseExampleNoRedemptionYear01 78
3 Years rr_ExpenseExampleNoRedemptionYear03 243
5 Years rr_ExpenseExampleNoRedemptionYear05 422
10 Years rr_ExpenseExampleNoRedemptionYear10 942
One Year rr_AverageAnnualReturnYear01 2.42%
Five Years rr_AverageAnnualReturnYear05 5.30%
Ten Years rr_AverageAnnualReturnYear10 6.68%
Since Inception rr_AverageAnnualReturnSinceInception   
PRUDENTIAL JENNISON MID-CAP GROWTH FUND, INC. | Return After Taxes on Distributions | Class A
 
Risk/Return: rr_RiskReturnAbstract  
One Year rr_AverageAnnualReturnYear01 (3.60%)
Five Years rr_AverageAnnualReturnYear05 3.79%
Ten Years rr_AverageAnnualReturnYear10 5.79%
Since Inception rr_AverageAnnualReturnSinceInception   
PRUDENTIAL JENNISON MID-CAP GROWTH FUND, INC. | Return After Taxes on Distribution and Sale of Fund Shares | Class A
 
Risk/Return: rr_RiskReturnAbstract  
One Year rr_AverageAnnualReturnYear01 (2.16%)
Five Years rr_AverageAnnualReturnYear05 3.28%
Ten Years rr_AverageAnnualReturnYear10 5.09%
Since Inception rr_AverageAnnualReturnSinceInception   
PRUDENTIAL JENNISON MID-CAP GROWTH FUND, INC. | Russell Midcap Growth Index (reflects no deduction for fees, expenses or taxes)
 
Risk/Return: rr_RiskReturnAbstract  
One Year rr_AverageAnnualReturnYear01 (1.65%)
Five Years rr_AverageAnnualReturnYear05 2.44%
Ten Years rr_AverageAnnualReturnYear10 5.29%
Since Inception rr_AverageAnnualReturnSinceInception   
PRUDENTIAL JENNISON MID-CAP GROWTH FUND, INC. | Russell Midcap Index (reflects no deduction for fees, expenses or taxes)
 
Risk/Return: rr_RiskReturnAbstract  
One Year rr_AverageAnnualReturnYear01 (1.55%)
Five Years rr_AverageAnnualReturnYear05 1.41%
Ten Years rr_AverageAnnualReturnYear10 6.99%
Since Inception rr_AverageAnnualReturnSinceInception   
PRUDENTIAL JENNISON MID-CAP GROWTH FUND, INC. | Lipper Mid-Cap Growth Funds Average (reflects no deduction for fees, expenses or taxes)
 
Risk/Return: rr_RiskReturnAbstract  
One Year rr_AverageAnnualReturnYear01 (4.30%) [2]
Five Years rr_AverageAnnualReturnYear05 2.19% [2]
Ten Years rr_AverageAnnualReturnYear10 4.36% [2]
Since Inception rr_AverageAnnualReturnSinceInception    [2]
PRUDENTIAL JENNISON MID-CAP GROWTH FUND, INC. | Lipper Multi-Cap Growth Funds Average (reflects no deduction for fees, expenses or taxes)
 
Risk/Return: rr_RiskReturnAbstract  
One Year rr_AverageAnnualReturnYear01 (3.59%) [2]
Five Years rr_AverageAnnualReturnYear05 1.27% [2]
Ten Years rr_AverageAnnualReturnYear10 3.25% [2]
Since Inception rr_AverageAnnualReturnSinceInception    [2]
[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. Without the distribution and service (12b-1) fee waiver of 0.05%, the annual returns would have been lower, too. Effective March 1, 2008 such waiver has been terminated. The total return for Class A shares from 1/1/12 to 9/30/12 was 15.80%.
[2] The Fund is compared to the Lipper Mid-Cap Growth Funds Performance Universe, although Lipper classifies the Fund in the Lipper Multi-Cap Growth Funds Performance Universe. The Lipper Mid-Cap Growth Funds Performance Universe is utilized because the Manager believes that the funds included in this Universe provide a more appropriate basis for Fund performance comparisons.