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Label Element Value
T. Rowe Price Diversified Mid-Cap Growth Fund, Inc.  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading Diversified Mid-Cap Growth Fund
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 fund, which are not reflected in the table or example below.

Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Shareholder fees (fees paid directly from your investment)
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual fund operating expenses (expenses that you pay each year as a percentage of the value of your investment)
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock

Portfolio Turnover 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 46.8% of the average value of its portfolio.

Portfolio Turnover, Rate rr_PortfolioTurnoverRate 46.80%
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 Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock

The fund normally invests at least 80% of its net assets (plus any borrowings for investment purposes) in a broadly diversified portfolio of common stocks of mid-cap growth companies. Shareholders will receive at least 60 days’ prior notice of a change to the fund’s 80% investment policy. For purposes of the fund’s 80% investment policy, the fund considers a company to be a growth company if the company’s securities are represented in an appropriate third-party growth-oriented index. Any derivatives that provide exposure to the investment focus suggested by the fund’s name, or to one or more market risk factors associated with the investment focus suggested by the fund’s name, are counted (as applicable) toward compliance with the fund’s 80% investment policy.

The fund defines a mid-cap company as a company whose market capitalization falls within the market capitalization range of companies in the Russell Midcap Index, MSCI USA Mid Cap Index or MSCI World Mid Cap Index (after systematically removing any companies that cannot reasonably be considered a mid-cap company from the high and low ends of the range of each index). The market capitalizations of the companies in the indexes change over time and the indexes are periodically reconstituted to ensure that they continue to accurately reflect the mid-cap equity market. As of December 31, 2024, the market capitalization range represented across these indexes (after removing any outlier companies) was $1.8 billion to $79 billion.

The fund has the flexibility to purchase some large-cap and small-cap companies that have qualities consistent with the portfolio’s core characteristics. The adviser expects the earnings of these companies to grow at a faster rate than the average company. The portfolio is broadly diversified, and the top 25 holdings are not expected to 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. The adviser generally uses 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. The adviser typically limits 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.

At times, the fund may have a significant portion of its assets invested in the same economic sector, such as the information technology sector.

Risk [Heading] rr_RiskHeading Principal Risks
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. The fund’s performance information included in the table is compared with a regulatory required index that represents an overall securities market (Regulatory Benchmark). In addition, the table may also include one or more indexes that more closely aligns to the fund’s investment strategy (Strategy Benchmark(s)).
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 Calendar Year Returns
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
         
  

Quarter Ended

Total

Return

  

Quarter Ended

Total

Return

 
 

Best Quarter

6/30/20

30.86%

 

Worst Quarter

3/31/20

-21.41%

 
Performance Table Heading rr_PerformanceTableHeading Average Annual Total Returns Periods ended December 31, 2024
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. The fund’s performance information included in the table is compared with a regulatory required index that represents an overall securities market (Regulatory Benchmark). In addition, the table may also include one or more indexes that more closely aligns to the fund’s investment strategy (Strategy Benchmark(s)).

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. | Risk Lose Money [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock The fund’s share price fluctuates, which means you could lose money by investing in the fund.
T. Rowe Price Diversified Mid-Cap Growth Fund, Inc. | Mid-cap stocks  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock

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

T. Rowe Price Diversified Mid-Cap Growth Fund, Inc. | Growth investing  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock

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.

T. Rowe Price Diversified Mid-Cap Growth Fund, Inc. | Stock investing  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock

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.

T. Rowe Price Diversified Mid-Cap Growth Fund, Inc. | Market conditions  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock

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 economic, political, or regulatory developments, recessions, inflation, rapid interest rate changes, war, military conflict, acts of terrorism, natural disasters, and outbreaks of infectious illnesses or other widespread public health issues (such as the coronavirus pandemic) and related governmental and public responses (including sanctions). 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. Government intervention in markets may impact interest rates, market volatility, and security pricing. 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.

T. Rowe Price Diversified Mid-Cap Growth Fund, Inc. | Sector exposure  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock

Sector exposure: 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.

T. Rowe Price Diversified Mid-Cap Growth Fund, Inc. | Information technology sector  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock

Information technology sector: Information technology companies face intense competition, both domestically and internationally, which may have an adverse effect on their profit margins.

Like other technology companies, information technology companies may have limited product lines, markets, financial resources, or personnel.

T. Rowe Price Diversified Mid-Cap Growth Fund, Inc. | Quantitative models  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock

Quantitative models: The fund’s reliance on quantitative models and the analysis of specific metrics in constructing the fund’s portfolio could cause the adviser to be unsuccessful in selecting companies for investment or determining the weighting of particular stocks in the portfolio. The impact of these metrics on a stock’s performance can be difficult to predict and stocks that previously possessed certain desirable quantitative characteristics may not continue to demonstrate those same characteristics in the future. In addition, relying on quantitative models entails the risk that the models themselves may be limited or incorrect, the data on which the models rely may be incorrect or incomplete, or the models may not be implemented as intended by the adviser. Any of these factors could cause the fund to underperform funds with similar strategies that do not select stocks based on quantitative analysis.

T. Rowe Price Diversified Mid-Cap Growth Fund, Inc. | Active management  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock

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.

T. Rowe Price Diversified Mid-Cap Growth Fund, Inc. | Cybersecurity breaches  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock

Cybersecurity breaches: The fund could be harmed by intentional cyberattacks and other cybersecurity breaches, including unauthorized access to the fund’s assets, confidential information, or other proprietary information. In addition, a cybersecurity breach could cause one of the fund’s service providers or financial intermediaries to suffer unauthorized data access, data corruption, or loss of operational functionality.

T. Rowe Price Diversified Mid-Cap Growth Fund, Inc. | Russell 3000® Index  
Risk/Return: rr_RiskReturnAbstract  
Label rr_AverageAnnualReturnLabel Russell 3000® Index [1]
T. Rowe Price Diversified Mid-Cap Growth Fund, Inc. | Russell 3000® Index  
Risk/Return: rr_RiskReturnAbstract  
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses, or taxes)
Label rr_AverageAnnualReturnLabel Russell 3000® Index
T. Rowe Price Diversified Mid-Cap Growth Fund, Inc. | Russell 3000® Index  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 23.81%
5 Years rr_AverageAnnualReturnYear05 13.86%
10 Years rr_AverageAnnualReturnYear10 12.55%
Since Inception rr_AverageAnnualReturnSinceInception 13.79% [2]
T. Rowe Price Diversified Mid-Cap Growth Fund, Inc. | Russell Midcap Growth Index  
Risk/Return: rr_RiskReturnAbstract  
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses, or taxes)
Label rr_AverageAnnualReturnLabel Russell Midcap Growth Index
T. Rowe Price Diversified Mid-Cap Growth Fund, Inc. | Russell Midcap Growth Index  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 22.10%
5 Years rr_AverageAnnualReturnYear05 11.47%
10 Years rr_AverageAnnualReturnYear10 11.54%
Since Inception rr_AverageAnnualReturnSinceInception 13.09% [2]
T. Rowe Price Diversified Mid-Cap Growth Fund, Inc. | Lipper Mid-Cap Growth Funds Index  
Risk/Return: rr_RiskReturnAbstract  
Label rr_AverageAnnualReturnLabel Lipper Mid-Cap Growth Funds Index
T. Rowe Price Diversified Mid-Cap Growth Fund, Inc. | Lipper Mid-Cap Growth Funds Index  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 10.73%
5 Years rr_AverageAnnualReturnYear05 7.38%
10 Years rr_AverageAnnualReturnYear10 9.34%
Since Inception rr_AverageAnnualReturnSinceInception 10.16% [2]
T. Rowe Price Diversified Mid-Cap Growth Fund, Inc. | Investor Class  
Risk/Return: rr_RiskReturnAbstract  
Maximum account fee rr_MaximumAccountFee $ 20 [3]
Management fees rr_ManagementFeesOverAssets 0.63%
Other expenses rr_OtherExpensesOverAssets 0.21%
Total annual fund operating expenses rr_ExpensesOverAssets 0.84%
1 Year rr_ExpenseExampleYear01 $ 86
3 Years rr_ExpenseExampleYear03 268
5 Years rr_ExpenseExampleYear05 466
10 Years rr_ExpenseExampleYear10 $ 1,037
Annual Return 2015 rr_AnnualReturn2015 2.06%
Annual Return 2016 rr_AnnualReturn2016 7.50%
Annual Return 2017 rr_AnnualReturn2017 24.72%
Annual Return 2018 rr_AnnualReturn2018 (3.11%)
Annual Return 2019 rr_AnnualReturn2019 37.90%
Annual Return 2020 rr_AnnualReturn2020 31.80%
Annual Return 2021 rr_AnnualReturn2021 13.74%
Annual Return 2022 rr_AnnualReturn2022 (24.63%)
Annual Return 2023 rr_AnnualReturn2023 20.78%
Annual Return 2024 rr_AnnualReturn2024 23.73%
Label rr_HighestQuarterlyReturnLabel Best Quarter
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2020
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 30.86%
Label rr_LowestQuarterlyReturnLabel Worst Quarter
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2020
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (21.41%)
1 Year rr_AverageAnnualReturnYear01 23.73%
5 Years rr_AverageAnnualReturnYear05 11.05%
10 Years rr_AverageAnnualReturnYear10 11.93%
Inception Date rr_AverageAnnualReturnInceptionDate Dec. 31, 2003
T. Rowe Price Diversified Mid-Cap Growth Fund, Inc. | Investor Class | After Taxes on Distributions  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 21.52%
5 Years rr_AverageAnnualReturnYear05 9.44%
10 Years rr_AverageAnnualReturnYear10 10.70%
T. Rowe Price Diversified Mid-Cap Growth Fund, Inc. | Investor Class | After Taxes on Distributions and Sales  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 15.80%
5 Years rr_AverageAnnualReturnYear05 8.58%
10 Years rr_AverageAnnualReturnYear10 9.65%
T. Rowe Price Diversified Mid-Cap Growth Fund, Inc. | I Class  
Risk/Return: rr_RiskReturnAbstract  
Maximum account fee rr_MaximumAccountFee none
Management fees rr_ManagementFeesOverAssets 0.63%
Other expenses rr_OtherExpensesOverAssets 0.04%
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 23.95%
5 Years rr_AverageAnnualReturnYear05 11.24%
Since Inception rr_AverageAnnualReturnSinceInception 13.27%
Inception Date rr_AverageAnnualReturnInceptionDate May 03, 2017
[1] Due to new SEC Rules on shareholder reporting, the fund adopted a new broad-based securities market index, referred to as the Regulatory Benchmark.
[2] Return since 5/3/17.
[3]

Subject to certain exceptions and account minimums, accounts are charged an annual $20 fee.