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Risk/Return: rr_RiskReturnAbstract  
Registrant Name dei_EntityRegistrantName T. Rowe Price New America Growth Fund, Inc.
Prospectus Date rr_ProspectusDate May 01, 2018
T. Rowe Price New America Growth Fund  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading T. Rowe Price

New America Growth Fund

Investor Class

I Class

Advisor Class

SUMMARY
Objective [Heading] rr_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The fund seeks to provide long-term capital growth by investing primarily in the common stocks of 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. You may also incur brokerage commissions and other charges when buying or selling shares of the fund, 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 74.9% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 74.90%
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 invests primarily (at least 65% of its total assets) in common stocks of U.S. companies operating in those sectors of the economy that, in T. Rowe Price’s view, are the fastest growing or have the greatest growth potential. The U.S. economy continues to evolve, in part because of the application of new technologies and scientific advances. Growing companies that are positioned to benefit from dynamic technological, social, medical, and business developments that help define the current U.S. economic landscape can be found across an array of industries. The fund’s allocation to industry sectors will generally reflect such factors as the overall revenue growth of the component companies in a sector and the sector’s contribution to U.S. gross domestic product from year to year, although the fund may at times invest significantly in stocks of information technology companies.

Holdings range from large-cap to small-cap companies. In selecting stocks, the advisor looks for many characteristics, typically including, but not limited to:
  • earnings growth rates that generally exceed that of the average company in the Russell 1000 Growth Index;
  • favorable company fundamentals, such as a strong balance sheet, sound business strategy, and promising competitive positioning;
  • effective management; or
  • stock valuations, such as price/earnings or price/cash flow ratios, that seem reasonable relative to the company’s prospects.
In pursuing its investment objective, the fund has the discretion to deviate from its normal investment criteria. These situations might arise when the fund’s adviser believes a security could increase in value for a variety of reasons, including an extraordinary corporate event, a new product introduction or innovation, a favorable competitive development, or a change in management.

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 objective. The fund may at times invest significantly in certain sectors, such as the information technology sector.

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 risks The investment adviser’s judgments about the attractiveness, value, or potential appreciation of the fund’s investments may prove to be incorrect. The fund could underperform in comparison to other funds with a similar benchmark or similar objectives and investment strategies if the fund’s overall investment selections or strategies fail to produce the intended results.

Risks of U.S. 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 a stock in which the fund invests may decline due to general weakness in the U.S. stock market, such as when the U.S. financial markets decline, or because of factors that affect a particular company or industry.

Investment style risks 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 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.

Market capitalization risks Because the fund may invest in companies of any size, its share price could be more volatile than a fund that invests only in large companies. Small and medium-sized companies often have less experienced management, narrower product lines, more limited financial resources, and less publicly available information than larger companies. Larger companies may not be able to attain the high growth rates of successful smaller companies, especially during strong economic periods, and they may be less capable of responding quickly to competitive challenges and industry changes.

Sector concentration risks At times, the fund may have a significant portion of its assets invested in securities of companies conducting business in a broadly related group of industries within an economic sector. Companies 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. For example, the fund may have a significant portion of its assets invested in securities of companies in the information technology sector. Companies in the information technology sector can be adversely affected by, among other things, intense competition, earnings disappointments, and rapid obsolescence of products and services due to technological innovations or changing consumer preferences.

Foreign investing risks The fund’s investments in foreign securities 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. These risks are heightened for the fund’s investments in emerging markets, which are more susceptible to governmental interference, less efficient trading markets, and the imposition of local taxes or restrictions on gaining access to sales proceeds for foreign investors.
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.
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 New America Growth Fund
Calendar Year Returns
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
  Quarter Ended    Total Return  Quarter Ended     Total Return
Best Quarter             6/30/09             18.70%      Worst Quarter            12/31/08            -25.70%
Performance Table Heading rr_PerformanceTableHeading Average Annual Total Returns

Periods ended
December 31, 2017
Performance Table Market Index Changed rr_PerformanceTableMarketIndexChanged Effective March 1, 2018, the Russell 1000 Growth Index replaced the S&P 500 Index as the fund’s primary benchmark. The Russell 1000 Growth Index is a more appropriate, style-specific benchmark that better aligns with the fund’s growth-focused investment style.
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.

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 New America Growth Fund | 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 0.15%
Total annual fund operating expenses rr_ExpensesOverAssets 0.79%
1 year rr_ExpenseExampleYear01 $ 81
3 years rr_ExpenseExampleYear03 252
5 years rr_ExpenseExampleYear05 439
10 years rr_ExpenseExampleYear10 $ 978
2008 rr_AnnualReturn2008 (38.31%)
2009 rr_AnnualReturn2009 49.33%
2010 rr_AnnualReturn2010 19.34%
2011 rr_AnnualReturn2011 (0.41%)
2012 rr_AnnualReturn2012 13.56%
2013 rr_AnnualReturn2013 37.73%
2014 rr_AnnualReturn2014 9.44%
2015 rr_AnnualReturn2015 8.80%
2016 rr_AnnualReturn2016 1.40%
2017 rr_AnnualReturn2017 34.57%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best Quarter
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2009
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 18.70%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst Quarter
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Dec. 31, 2008
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (25.70%)
1 Year rr_AverageAnnualReturnYear01 34.57%
5 Years rr_AverageAnnualReturnYear05 17.48%
10 Years rr_AverageAnnualReturnYear10 10.77%
Since inception rr_AverageAnnualReturnSinceInception
Inception date rr_AverageAnnualReturnInceptionDate Sep. 30, 1985
T. Rowe Price New America Growth Fund | 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 0.02%
Total annual fund operating expenses rr_ExpensesOverAssets 0.66%
1 year rr_ExpenseExampleYear01 $ 67
3 years rr_ExpenseExampleYear03 211
5 years rr_ExpenseExampleYear05 368
10 years rr_ExpenseExampleYear10 $ 822
1 Year rr_AverageAnnualReturnYear01 34.76%
5 Years rr_AverageAnnualReturnYear05
10 Years rr_AverageAnnualReturnYear10
Since inception rr_AverageAnnualReturnSinceInception 16.45%
Inception date rr_AverageAnnualReturnInceptionDate Dec. 17, 2015
T. Rowe Price New America Growth Fund | Advisor Class  
Risk/Return: rr_RiskReturnAbstract  
Maximum account fee rr_MaximumAccountFee
Management fees rr_ManagementFeesOverAssets 0.64%
Distribution and service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other expenses rr_OtherExpensesOverAssets 0.17%
Total annual fund operating expenses rr_ExpensesOverAssets 1.06%
1 year rr_ExpenseExampleYear01 $ 108
3 years rr_ExpenseExampleYear03 337
5 years rr_ExpenseExampleYear05 585
10 years rr_ExpenseExampleYear10 $ 1,294
1 Year rr_AverageAnnualReturnYear01 34.22%
5 Years rr_AverageAnnualReturnYear05 17.17%
10 Years rr_AverageAnnualReturnYear10 10.50%
Since inception rr_AverageAnnualReturnSinceInception
Inception date rr_AverageAnnualReturnInceptionDate Dec. 30, 2005
T. Rowe Price New America Growth Fund | Returns after taxes on distributions | Investor Class  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 30.70%
5 Years rr_AverageAnnualReturnYear05 14.44%
10 Years rr_AverageAnnualReturnYear10 9.11%
Since inception rr_AverageAnnualReturnSinceInception
Inception date rr_AverageAnnualReturnInceptionDate Sep. 30, 1985
T. Rowe Price New America Growth Fund | Returns after taxes on distributions and sale of fund shares | Investor Class  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 22.10%
5 Years rr_AverageAnnualReturnYear05 13.30%
10 Years rr_AverageAnnualReturnYear10 8.40%
Since inception rr_AverageAnnualReturnSinceInception
Inception date rr_AverageAnnualReturnInceptionDate Sep. 30, 1985
T. Rowe Price New America Growth Fund | Russell 1000 Growth Index (reflects no deduction for fees, expenses, or taxes)  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 30.21% [2]
5 Years rr_AverageAnnualReturnYear05 17.33% [2]
10 Years rr_AverageAnnualReturnYear10 10.00% [2]
Since inception rr_AverageAnnualReturnSinceInception 17.71% [2],[3]
Inception date rr_AverageAnnualReturnInceptionDate Dec. 17, 2015 [2]
T. Rowe Price New America Growth Fund | S&P 500 Index (reflects no deduction for fees, expenses, or taxes)  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 21.83%
5 Years rr_AverageAnnualReturnYear05 15.79%
10 Years rr_AverageAnnualReturnYear10 8.50%
Since inception rr_AverageAnnualReturnSinceInception 16.54% [3]
Inception date rr_AverageAnnualReturnInceptionDate Dec. 17, 2015
T. Rowe Price New America Growth Fund | Lipper Multi-Cap Growth Funds Index  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 28.76%
5 Years rr_AverageAnnualReturnYear05 15.71%
10 Years rr_AverageAnnualReturnYear10 8.33%
Since inception rr_AverageAnnualReturnSinceInception 15.02% [3]
Inception date rr_AverageAnnualReturnInceptionDate Dec. 17, 2015
[1] Subject to certain exceptions, accounts with a balance of less than $10,000 are charged an annual $20 fee.
[2] Effective March 1, 2018, the Russell 1000 Growth Index replaced the S&P 500 Index as the fund’s primary benchmark. The Russell 1000 Growth Index is a more appropriate, style-specific benchmark that better aligns with the fund’s growth-focused investment style.
[3] Return as of 12/17/15.