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Label Element Value
Risk/Return: rr_RiskReturnAbstract  
Document Type dei_DocumentType 485BPOS
Document Period End Date dei_DocumentPeriodEndDate Dec. 31, 2011
Registrant Name dei_EntityRegistrantName T. Rowe Price Diversified Small-Cap Growth Fund, Inc.
Central Index Key dei_EntityCentralIndexKey 0001038469
Amendment Flag dei_AmendmentFlag false
Document Creation Date dei_DocumentCreationDate Apr. 26, 2012
Document Effective Date dei_DocumentEffectiveDate May 01, 2012
Prospectus Date rr_ProspectusDate May 01, 2012
T. Rowe Price Diversified Small-Cap Growth Fund, Inc.
  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading

Diversified Small-Cap Growth Fund

SUMMARY
Objective [Heading] rr_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The fund seeks long-term growth of capital by investing primarily in common stocks of small 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 and hold shares of the fund.
Shareholder Fees: rr_ShareholderFeesAbstract  
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption

Fees and Expenses of the Fund

Shareholder fees (fees paid directly from your investment)
Operating Expenses: rr_OperatingExpensesAbstract  
Operating Expenses Caption [Text] rr_OperatingExpensesCaption

Annual fund operating expenses

(expenses that you pay each year as a

percentage of the value of your investment)
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock The fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when fund shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the example, affect the fund’s performance. During the most recent fiscal year, the fund’s portfolio turnover rate was 16.9% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 16.90%
Expenses Restated to Reflect Current [Text] rr_ExpensesRestatedToReflectCurrent Restated to reflect current fees.
Expense Example: rr_ExpenseExampleAbstract  
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. The example also assumes 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 small-cap growth companies, which are defined by the fund as those whose market capitalization falls within the range of companies in the MSCI US Small Cap Growth Index. (A company’s market capitalization is determined by multiplying its shares outstanding by its stock price.) As of December 31, 2011, the market capitalization range for the MSCI US Small Cap Growth Index was approximately $39.3 million to $4 billion. The market capitalization of the companies in the fund’s portfolio and the MSCI US Small Cap Growth Index changes over time, and the fund will not sell a stock just because the company has grown to a market capitalization outside the range. Most of the stocks purchased by the fund will be in this size range. However, the fund may on occasion purchase a stock whose market capitalization exceeds the range.

The fund seeks to invest in a broadly diversified portfolio of securities and the top 25 holdings will not, under normal circumstances, constitute more than 50% of the fund’s total assets. This broad diversification helps to minimize the effects of individual security selection on fund performance. The fund employs a number of quantitative models developed by T. Rowe Price to identify stocks that could be included in the portfolio. Based on these models and fundamental research, the portfolio is constructed in a “bottom up” manner which takes into consideration stock characteristics, such as projected earnings and sales growth rates, valuation, capital usage, and earnings quality. We also consider portfolio risk characteristics in the process of portfolio construction. In building the investment models and adjusting them as needed, the fund draws on T. Rowe Price’s experience in small-cap growth investing—quantitative and fundamental research, portfolio strategy, and trading.

While most assets will typically be invested in U.S. common stocks, the fund may invest in foreign stocks in keeping with the fund’s objectives.

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 mutual fund, there is no guarantee that the fund will achieve its objective. 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 are summarized as follows:

Active management risk The fund is subject to the risk that the investment adviser’s judgments about the attractiveness, value, or potential appreciation of the fund’s investments may prove to be incorrect. If the securities selected and strategies employed by the fund fail to produce the intended results, the fund could underperform other funds with similar objectives and investment strategies.

Risks of 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 prices and falling prices. The value of a stock in which the fund invests may decline due to general weakness in the stock market or because of factors that affect a company or a particular industry.

Market capitalization risk Investing primarily in issuers within the same market capitalization category carries the risk that the category may be out of favor due to current market conditions or investor sentiment. Because the fund invests primarily in securities issued by small-cap companies, it is likely to be more volatile than a fund that focuses on securities issued by larger companies. Small-sized companies often have less experienced management, narrower product lines, more limited financial resources, and less publicly available information than larger companies. In addition, smaller companies are typically more sensitive to changes in overall economic conditions and their securities may be difficult to trade.

Investment style risk Different investment styles tend to shift in and out of favor, depending on market conditions and investor sentiment. 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 usually 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.

Foreign investing risk This is the risk that the fund’s investments in foreign securities may be adversely affected by political and economic conditions overseas, reduced liquidity, or decreases in foreign currency values relative to the U.S. dollar.
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 bar chart showing calendar year returns and the average annual total returns table indicate risk by illustrating how much returns can differ from one year to the next and how fund performance compares with that of a comparable market index. The fund’s past performance (before and after taxes) is not necessarily an indication of future performance.

The fund can also experience short-term performance swings, as shown by the best and worst calendar quarter returns during the years depicted.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The bar chart showing calendar year returns and the average annual total returns table indicate risk by illustrating how much returns can differ from one year to the next and how fund performance compares with that of a comparable market index.
Performance Availability Phone [Text] rr_PerformanceAvailabilityPhone 1-800-225-5132
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress troweprice.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture The fund’s past performance (before and after taxes) is not necessarily an indication of future performance.
Bar Chart Table: rr_BarChartTableAbstract  
Bar Chart [Heading] rr_BarChartHeading

Diversified Small-Cap Growth Fund

Calendar Year Returns
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
           
    Quarter   Total  
    Ended   Return  
Best Quarter   6/30/03   22.94  
Worst Quarter   12/31/08   -25.7%  
Average Annual Return: rr_AverageAnnualReturnAbstract  
Performance Table Heading rr_PerformanceTableHeading

Average Annual Total Returns

Periods ended

December 31, 2011
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 a 401(k) account or individual retirement account.
Performance Table Narrative rr_PerformanceTableNarrativeTextBlock In addition, the average annual total returns table shows hypothetical after-tax returns to suggest 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 individual retirement account.
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock Updated performance information is available through troweprice.com or may be obtained by calling 1-800-225-5132.
T. Rowe Price Diversified Small-Cap Growth Fund, Inc. | T. Rowe Price Diversified Small-Cap Growth Fund, Inc.
  
Shareholder Fees: rr_ShareholderFeesAbstract  
Maximum sales charge (load) imposed on purchases rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum deferred sales charge (load) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Redemption fee (as a percentage of amount redeemed on shares held for 90 days or less) rr_RedemptionFeeOverRedemption 1.00%
Maximum account fee rr_MaximumAccountFee 20 [1]
Operating Expenses: rr_OperatingExpensesAbstract  
Management fees rr_ManagementFeesOverAssets 0.65%
Distribution and service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses rr_OtherExpensesOverAssets 0.40% [2]
Total annual fund operating expenses rr_ExpensesOverAssets 1.05%
Expense Example: rr_ExpenseExampleAbstract  
1 year rr_ExpenseExampleYear01 107
3 years rr_ExpenseExampleYear03 334
5 years rr_ExpenseExampleYear05 579
10 years rr_ExpenseExampleYear10 1,283
Bar Chart Table: rr_BarChartTableAbstract  
'02 rr_AnnualReturn2002 (27.50%)
'03 rr_AnnualReturn2003 40.24%
'04 rr_AnnualReturn2004 10.26%
'05 rr_AnnualReturn2005 10.49%
'06 rr_AnnualReturn2006 3.35%
'07 rr_AnnualReturn2007 9.35%
'08 rr_AnnualReturn2008 (36.28%)
'09 rr_AnnualReturn2009 37.98%
'10 rr_AnnualReturn2010 33.50%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best Quarter
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2003
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 22.94%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst Quarter
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Dec. 31, 2008
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (25.70%)
Average Annual Return: rr_AverageAnnualReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 1.54%
5 Years rr_AverageAnnualReturnYear05 5.44%
10 Years rr_AverageAnnualReturnYear10 5.25%
T. Rowe Price Diversified Small-Cap Growth Fund, Inc. | Returns after taxes on distributions | T. Rowe Price Diversified Small-Cap Growth Fund, Inc.
  
Average Annual Return: rr_AverageAnnualReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 0.96%
5 Years rr_AverageAnnualReturnYear05 4.83%
10 Years rr_AverageAnnualReturnYear10 4.95%
T. Rowe Price Diversified Small-Cap Growth Fund, Inc. | Returns after taxes on distributions and sale of fund shares | T. Rowe Price Diversified Small-Cap Growth Fund, Inc.
  
Average Annual Return: rr_AverageAnnualReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 1.73%
5 Years rr_AverageAnnualReturnYear05 4.56%
10 Years rr_AverageAnnualReturnYear10 4.53%
T. Rowe Price Diversified Small-Cap Growth Fund, Inc. | MSCI US Small Cap Growth Index
  
Average Annual Return: rr_AverageAnnualReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 (1.53%)
5 Years rr_AverageAnnualReturnYear05 3.73%
10 Years rr_AverageAnnualReturnYear10 6.08%
T. Rowe Price Diversified Small-Cap Growth Fund, Inc. | Lipper Small-Cap Growth Funds Index
  
Average Annual Return: rr_AverageAnnualReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 (3.40%)
5 Years rr_AverageAnnualReturnYear05 1.14%
10 Years rr_AverageAnnualReturnYear10 3.65%
[1] Subject to certain exceptions, accounts with a balance of less than $10,000 are charged an annual $20 fee.
[2] Restated to reflect current fees.