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Risk/Return: rr_RiskReturnAbstract  
Registrant Name dei_EntityRegistrantName T. Rowe Price Diversified Mid-Cap Growth Fund, Inc.
Prospectus Date rr_ProspectusDate May 01, 2020
T. Rowe Price Diversified Mid-Cap Growth Fund, Inc.  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading T. ROWE PRICE Diversified Mid-Cap Growth Fund Investor Class I Class SUMMARY
Objective [Heading] rr_ObjectiveHeading Investment Objective(s)
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The fund seeks to provide long-term capital growth by investing primarily in the common stocks of mid-cap growth companies.
Expense [Heading] rr_ExpenseHeading Fees and Expenses
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock This table describes the fees and expenses that you may pay if you buy, hold, and sell shares of the fund. You may also incur brokerage commissions and other charges when buying or selling shares of the Investor Class or I Class, which are not reflected in the table.
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Fees and Expenses of the Fund 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 the fund’s 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 most recent fiscal year, the fund’s portfolio turnover rate was 10.9% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 10.90%
Expense Example [Heading] rr_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock This example is intended to help you compare the cost of investing in the fund with the cost of investing in other mutual funds. The example assumes that you invest $10,000 in the fund for the time periods indicated and then redeem all of your shares at the end of those periods, that your investment has a 5% return each year, and that the fund’s operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Strategy [Heading] rr_StrategyHeading Investments, Risks, and Performance Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock The fund will normally invest at least 80% of its net assets (including any borrowings for investment purposes) in a broadly diversified portfolio of common stocks of mid-cap growth companies. T. Rowe Price expects the earnings of these companies to grow at a faster rate than the average company. The fund defines mid-cap companies as those whose market capitalization falls within the range of either the S&P MidCap 400 Index or the Russell Midcap Growth Index. As of December 31, 2019, the market capitalization ranges for the S&P MidCap 400 Index and the Russell Midcap Growth Index were approximately $1.1 billion to $19.4 billion, and $1.2 billion to $78.6 billion, respectively. (A company’s market capitalization is determined by multiplying its shares outstanding by its stock price.)

The fund has the flexibility to purchase some larger and smaller companies that have qualities consistent with the portfolio’s core characteristics. In other words, the fund may on occasion purchase a stock whose market capitalization is outside of the capitalization range of mid-cap companies. The market capitalization of the companies in the fund’s portfolio, the S&P MidCap 400 Index, and the Russell Midcap Growth Index will change over time, and the fund will not automatically sell or cease to purchase a stock of a company it already owns just because the company’s market capitalization grows or falls outside of the index ranges. The portfolio will be broadly diversified, and the top 25 holdings will not constitute a large portion of the fund’s assets. This broad diversification should help reduce the effects of individual security price volatility on overall fund performance.

Stock selection is based on a combination of fundamental, bottom-up analysis and top-down quantitative strategies in an effort to identify companies with superior long-term appreciation prospects. We generally use a growth approach, looking for companies with one or more of the following characteristics:
  • a demonstrated ability to consistently increase revenues, earnings, and cash flow;
  • capable management;
  • attractive business niches; and
  • a sustainable competitive advantage.
Valuation measures, such as a company’s price/earnings (P/E) ratio relative to the market and its own growth rate, are also considered. We will typically limit holdings of high-yielding stocks, but the payment of dividends—even above-average dividends—does not disqualify a stock from consideration. Most holdings are expected to have relatively low dividend yields.

In pursuing its investment objective(s), the fund’s management has the discretion to purchase some securities that do not meet its normal investment criteria. These special situations might arise when the fund’s management believes a security could increase in value for a variety of reasons, including a change in management, an extraordinary corporate event, or a temporary imbalance in the supply of or demand for the securities.

While most assets will typically be invested in U.S. common stocks, the fund may invest in foreign stocks in keeping with its objective(s). The fund may at times invest significantly in certain sectors, such as the information technology sector. In addition, the fund lends its portfolio securities as a means of generating additional income.

The fund may sell securities for a variety of reasons, such as to secure gains, limit losses, or redeploy assets into more promising opportunities.
Risk [Heading] rr_RiskHeading Principal Risks
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock As with any fund, there is no guarantee that the fund will achieve its objective(s). The fund’s share price fluctuates, which means you could lose money by investing in the fund. The principal risks of investing in this fund, which may be even greater during periods of market disruption or volatility, are summarized as follows:

Market conditions The value of the fund’s investments may decrease, sometimes rapidly or unexpectedly, due to factors affecting an issuer held by the fund, particular industries, or the overall securities markets. A variety of factors can increase the volatility of the fund’s holdings and markets generally, including political or regulatory developments, recessions, inflation, rapid interest rate changes, war or acts of terrorism, natural disasters, and outbreaks of infectious illnesses or other widespread public health issues. Certain events may cause instability across global markets, including reduced liquidity and disruptions in trading markets, while some events may affect certain geographic regions, countries, sectors, and industries more significantly than others. These adverse developments may cause broad declines in market value due to short-term market movements or for significantly longer periods during more prolonged market downturns.

Mid-cap stocks Investments in securities issued by mid-cap companies are likely to be more volatile than investments in securities issued by larger companies. Medium-sized companies may have less seasoned management, narrower product lines, and less capital reserves and liquidity than larger companies, and are therefore more sensitive to economic, market, and industry changes.

Growth investing The fund’s growth approach to investing could cause it to underperform other stock funds that employ a different investment style. Growth stocks tend to be more volatile than certain other types of stocks and their prices may fluctuate more dramatically than the overall stock market. A stock with growth characteristics can have sharp price declines due to decreases in current or expected earnings and may lack dividends that can help cushion its share price in a declining market.

Sector exposure At times, the fund may have a significant portion of its assets invested in securities of issuers conducting business in a broadly related group of industries within the same economic sector. Issuers in the same economic sector may be similarly affected by economic or market events, making the fund more vulnerable to unfavorable developments in that economic sector than funds that invest more broadly. Investments in the technology sector are susceptible to intense competition, government regulation, changing consumer preferences, and dependency on patent protection.

Stock investing Stocks generally fluctuate in value more than bonds and may decline significantly over short time periods. There is a chance that stock prices overall will decline because stock markets tend to move in cycles, with periods of rising and falling prices. The value of stocks held by the fund may decline due to general weakness or volatility in the stock markets in which the fund invests or because of factors that affect a particular company or industry.

Foreign investing Investments in the securities of non-U.S. issuers may be adversely affected by local, political, social, and economic conditions overseas, greater volatility, reduced liquidity, or decreases in foreign currency values relative to the U.S. dollar. The risks of investing outside the U.S. are heightened for any investments in emerging markets, which are susceptible to greater volatility than investments in developed markets.

Securities lending Securities lending involves the risk that the fund may lose money because the borrower of the loaned securities fails to return the securities to the fund in a timely manner or at all. The fund may also lose money if there is a decline in the value of the collateral provided for loaned securities or a decline in the value of any investments made with cash collateral. In addition, securities lending activities may cause adverse tax consequences for the fund.

Active management The fund’s overall investment program and holdings selected by the fund’s investment adviser may underperform the broad markets, relevant indices, or other funds with similar objectives and investment strategies.
Risk Lose Money [Text] rr_RiskLoseMoney The fund’s share price fluctuates, which means you could lose money by investing in the fund.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock The following performance information provides some indication of the risks of investing in the fund. The fund’s performance information represents only past performance (before and after taxes) and is not necessarily an indication of future results.

The following bar chart illustrates how much returns can differ from year to year by showing calendar year returns and the best and worst calendar quarter returns during those years for the fund’s Investor Class. Returns for other share classes vary since they have different expenses.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The following performance information provides some indication of the risks of investing in the fund. The following bar chart illustrates how much returns can differ from year to year by showing calendar year returns and the best and worst calendar quarter returns during those years for the fund’s Investor Class. Returns for other share classes vary since they have different expenses. The following table shows the average annual total returns for each class of the fund that has been in operation for at least one full calendar year, and also compares the returns with the returns of a relevant broad-based market index, as well as with the returns of one or more comparative indexes that have investment characteristics similar to those of the fund, if applicable.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress troweprice.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture The fund’s performance information represents only past performance (before and after taxes) and is not necessarily an indication of future results.
Bar Chart [Heading] rr_BarChartHeading DIVERSIFIED MID-CAP GROWTH FUND Calendar Year Returns
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
  Quarter Ended    Total Return  Quarter Ended     Total Return
Best Quarter             3/31/19             19.39%      Worst Quarter            9/30/11            -20.47%
Performance Table Heading rr_PerformanceTableHeading Average Annual Total Returns Periods ended December 31, 2019
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 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 a 401(k) account or an IRA.
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown After-tax returns are shown only for the Investor Class and will differ for other share classes.
Performance Table Narrative rr_PerformanceTableNarrativeTextBlock The following table shows the average annual total returns for each class of the fund that has been in operation for at least one full calendar year, and also compares the returns with the returns of a relevant broad-based market index, as well as with the returns of one or more comparative indexes that have investment characteristics similar to those of the fund, if applicable.

In addition, the table shows hypothetical after-tax returns to demonstrate how taxes paid by a shareholder may influence returns. 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 a 401(k) account or an IRA. After-tax returns are shown only for the Investor Class and will differ for other share classes.
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock Updated performance information is available through troweprice.com.
T. Rowe Price Diversified Mid-Cap Growth Fund, Inc. | Investor Class  
Risk/Return: rr_RiskReturnAbstract  
Maximum account fee rr_MaximumAccountFee $ 20 [1]
Management fees rr_ManagementFeesOverAssets 0.64%
Distribution and service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets
Other expenses rr_OtherExpensesOverAssets 0.16%
Total annual fund operating expenses rr_ExpensesOverAssets 0.80%
1 year rr_ExpenseExampleYear01 $ 82
3 years rr_ExpenseExampleYear03 255
5 years rr_ExpenseExampleYear05 444
10 years rr_ExpenseExampleYear10 $ 990
2010 rr_AnnualReturn2010 27.94%
2011 rr_AnnualReturn2011 (4.39%)
2012 rr_AnnualReturn2012 16.51%
2013 rr_AnnualReturn2013 34.57%
2014 rr_AnnualReturn2014 11.47%
2015 rr_AnnualReturn2015 2.06%
2016 rr_AnnualReturn2016 7.50%
2017 rr_AnnualReturn2017 24.72%
2018 rr_AnnualReturn2018 (3.11%)
2019 rr_AnnualReturn2019 37.90%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best Quarter
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Mar. 31, 2019
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 19.39%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst Quarter
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Sep. 30, 2011
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (20.47%)
1 Year rr_AverageAnnualReturnYear01 37.90%
5 Years rr_AverageAnnualReturnYear05 12.83%
10 Years rr_AverageAnnualReturnYear10 14.60%
Since inception rr_AverageAnnualReturnSinceInception
Inception date rr_AverageAnnualReturnInceptionDate Dec. 31, 2003
T. Rowe Price Diversified Mid-Cap Growth Fund, Inc. | I Class  
Risk/Return: rr_RiskReturnAbstract  
Maximum account fee rr_MaximumAccountFee
Management fees rr_ManagementFeesOverAssets 0.64%
Distribution and service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets
Other expenses rr_OtherExpensesOverAssets 0.03%
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_AverageAnnualReturnYear01 38.07%
5 Years rr_AverageAnnualReturnYear05
10 Years rr_AverageAnnualReturnYear10
Since inception rr_AverageAnnualReturnSinceInception 17.19%
Inception date rr_AverageAnnualReturnInceptionDate May 03, 2017
T. Rowe Price Diversified Mid-Cap Growth Fund, Inc. | Returns after taxes on distributions | Investor Class  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 37.23%
5 Years rr_AverageAnnualReturnYear05 11.98%
10 Years rr_AverageAnnualReturnYear10 13.99%
Since inception rr_AverageAnnualReturnSinceInception
Inception date rr_AverageAnnualReturnInceptionDate Dec. 31, 2003
T. Rowe Price Diversified Mid-Cap Growth Fund, Inc. | Returns after taxes on distributions and sale of fund shares | Investor Class  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 22.89%
5 Years rr_AverageAnnualReturnYear05 10.07%
10 Years rr_AverageAnnualReturnYear10 12.19%
Since inception rr_AverageAnnualReturnSinceInception
Inception date rr_AverageAnnualReturnInceptionDate Dec. 31, 2003
T. Rowe Price Diversified Mid-Cap Growth Fund, Inc. | Russell Midcap Growth Index (reflects no deduction for fees, expenses, or taxes)  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 35.47%
5 Years rr_AverageAnnualReturnYear05 11.60%
10 Years rr_AverageAnnualReturnYear10 14.24%
Since inception rr_AverageAnnualReturnSinceInception 16.18% [2]
Inception date rr_AverageAnnualReturnInceptionDate May 03, 2017
T. Rowe Price Diversified Mid-Cap Growth Fund, Inc. | S&P MidCap 400 Index (reflects no deduction for fees, expenses, or taxes)  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 26.20%
5 Years rr_AverageAnnualReturnYear05 9.03%
10 Years rr_AverageAnnualReturnYear10 12.72%
Since inception rr_AverageAnnualReturnSinceInception 8.68% [2]
Inception date rr_AverageAnnualReturnInceptionDate May 03, 2017
T. Rowe Price Diversified Mid-Cap Growth Fund, Inc. | Lipper Mid-Cap Growth Funds Index  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 33.83%
5 Years rr_AverageAnnualReturnYear05 11.33%
10 Years rr_AverageAnnualReturnYear10 13.02%
Since inception rr_AverageAnnualReturnSinceInception 15.59% [2]
Inception date rr_AverageAnnualReturnInceptionDate May 03, 2017
[1] Subject to certain exceptions, accounts with a balance of less than $10,000 are charged an annual $20 fee.
[2] Return since 5/3/17.