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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 Blue Chip Growth Fund, Inc.
Central Index Key dei_EntityCentralIndexKey 0000902259
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
Investor Class Shares | T. Rowe Price Blue Chip Growth Fund, Inc.
  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading

Blue Chip Growth Fund

SUMMARY
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The fund seeks to provide long-term capital growth.
Objective, Secondary [Text Block] rr_ObjectiveSecondaryTextBlock Income is a secondary objective.
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 44.2% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 44.20%
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 the common stocks of large and medium-sized blue chip growth companies. These are firms that, in our view, are well established in their industries and have the potential for above-average earnings growth. We focus on companies with leading market position, seasoned management, and strong financial fundamentals. Our investment approach reflects our belief that solid company fundamentals (with emphasis on strong growth in earnings per share or operating cash flow) combined with a positive industry outlook will ultimately reward investors with strong investment performance. Some of the companies we target should have good prospects for dividend growth.

In pursuing its investment objective, the fund has the discretion to deviate from its normal investment criteria, as previously described, and purchase securities that the fund's management believes will provide an opportunity for substantial appreciation. These situations might arise when the fund’s management 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 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.

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

Blue Chip Growth Fund

Calendar Year Returns
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
           
    Quarter   Total  
    Ended   Return  
Best Quarter   6/30/09   17.44%  
Worst Quarter   12/31/08   -24.91%  
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.
Investor Class Shares | T. Rowe Price Blue Chip Growth Fund, Inc. | T. Rowe Price Blue Chip 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 rr_RedemptionFeeOverRedemption none
Maximum account fee rr_MaximumAccountFee 20 [1]
Operating Expenses: rr_OperatingExpensesAbstract  
Management fees rr_ManagementFeesOverAssets 0.60%
Distribution and service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses rr_OtherExpensesOverAssets 0.17%
Total annual fund operating expenses rr_ExpensesOverAssets 0.77%
Expense Example: rr_ExpenseExampleAbstract  
1 year rr_ExpenseExampleYear01 79
3 years rr_ExpenseExampleYear03 246
5 years rr_ExpenseExampleYear05 428
10 years rr_ExpenseExampleYear10 954
Bar Chart Table: rr_BarChartTableAbstract  
02 rr_AnnualReturn2002 (24.23%)
03 rr_AnnualReturn2003 29.75%
04 rr_AnnualReturn2004 9.25%
05 rr_AnnualReturn2005 5.95%
06 rr_AnnualReturn2006 9.73%
07 rr_AnnualReturn2007 13.02%
08 rr_AnnualReturn2008 (42.62%)
09 rr_AnnualReturn2009 42.57%
10 rr_AnnualReturn2010 16.42%
11 rr_AnnualReturn2011 1.50%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best Quarter
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2009
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 17.44%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst Quarter
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Dec. 31, 2008
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (24.91%)
Average Annual Return: rr_AverageAnnualReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 1.50%
5 Years rr_AverageAnnualReturnYear05 1.78%
10 Years rr_AverageAnnualReturnYear10 3.15%
Investor Class Shares | T. Rowe Price Blue Chip Growth Fund, Inc. | Returns after taxes on distributions | T. Rowe Price Blue Chip Growth Fund, Inc.
  
Average Annual Return: rr_AverageAnnualReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 1.48%
5 Years rr_AverageAnnualReturnYear05 1.75%
10 Years rr_AverageAnnualReturnYear10 3.12%
Investor Class Shares | T. Rowe Price Blue Chip Growth Fund, Inc. | Returns after taxes on distributions and sale of fund shares | T. Rowe Price Blue Chip Growth Fund, Inc.
  
Average Annual Return: rr_AverageAnnualReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 1.00%
5 Years rr_AverageAnnualReturnYear05 1.52%
10 Years rr_AverageAnnualReturnYear10 2.73%
Investor Class Shares | T. Rowe Price Blue Chip Growth Fund, Inc. | S&P 500 Index
  
Average Annual Return: rr_AverageAnnualReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 2.11%
5 Years rr_AverageAnnualReturnYear05 (0.25%)
10 Years rr_AverageAnnualReturnYear10 2.92%
Investor Class Shares | T. Rowe Price Blue Chip Growth Fund, Inc. | Lipper Large-Cap Growth Funds Index
  
Average Annual Return: rr_AverageAnnualReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 (2.90%)
5 Years rr_AverageAnnualReturnYear05 0.85%
10 Years rr_AverageAnnualReturnYear10 1.43%
Advisor Class Shares | T. Rowe Price Blue Chip Growth Fund, Inc.
  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading

Blue Chip Growth Fund–Advisor Class

SUMMARY
Objective [Heading] rr_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The fund seeks to provide long-term capital growth.
Objective, Secondary [Text Block] rr_ObjectiveSecondaryTextBlock Income is a secondary objective.
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.
Operating Expenses: rr_OperatingExpensesAbstract  
Operating Expenses Caption [Text] rr_OperatingExpensesCaption

Fees and Expenses of the Fund’s Advisor Class

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 44.2% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 44.20%
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 the common stocks of large and medium-sized blue chip growth companies. These are firms that, in our view, are well established in their industries and have the potential for above-average earnings growth. We focus on companies with leading market position, seasoned management, and strong financial fundamentals. Our investment approach reflects our belief that solid company fundamentals (with emphasis on strong growth in earnings per share or operating cash flow) combined with a positive industry outlook will ultimately reward investors with strong investment performance. Some of the companies we target should have good prospects for dividend growth.

In pursuing its investment objective, the fund has the discretion to deviate from its normal investment criteria, as previously described, and purchase securities that the fund’s management believes will provide an opportunity for substantial appreciation. These situations might arise when the fund’s management 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 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.

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 1-800-638-8790
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

Blue Chip Growth Fund - Advisor Class

Calendar Year Returns
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
           
    Quarter   Total  
    Ended   Return  
Best Quarter   6/30/09   17.42%  
Worst Quarter   12/31/08   -24.93%  
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 1-800-638-8790.
Advisor Class Shares | T. Rowe Price Blue Chip Growth Fund, Inc. | T. Rowe Price Blue Chip Growth Fund-Advisor Class
  
Operating Expenses: rr_OperatingExpensesAbstract  
Management fees rr_ManagementFeesOverAssets 0.60%
Distribution and service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other expenses rr_OtherExpensesOverAssets 0.15%
Total annual fund operating expenses rr_ExpensesOverAssets 1.00%
Expense Example: rr_ExpenseExampleAbstract  
1 year rr_ExpenseExampleYear01 102
3 years rr_ExpenseExampleYear03 318
5 years rr_ExpenseExampleYear05 552
10 years rr_ExpenseExampleYear10 1,225
Bar Chart Table: rr_BarChartTableAbstract  
02 rr_AnnualReturn2002 (24.26%)
03 rr_AnnualReturn2003 29.77%
04 rr_AnnualReturn2004 9.10%
05 rr_AnnualReturn2005 5.79%
06 rr_AnnualReturn2006 9.60%
07 rr_AnnualReturn2007 12.81%
08 rr_AnnualReturn2008 (42.72%)
09 rr_AnnualReturn2009 42.30%
10 rr_AnnualReturn2010 16.16%
11 rr_AnnualReturn2011 1.26%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best Quarter
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2009
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 17.42%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst Quarter
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Dec. 31, 2008
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (24.93%)
Average Annual Return: rr_AverageAnnualReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 1.26%
5 Years rr_AverageAnnualReturnYear05 1.58%
10 Years rr_AverageAnnualReturnYear10 3.00%
Advisor Class Shares | T. Rowe Price Blue Chip Growth Fund, Inc. | Returns after taxes on distributions | T. Rowe Price Blue Chip Growth Fund-Advisor Class
  
Average Annual Return: rr_AverageAnnualReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 1.26%
5 Years rr_AverageAnnualReturnYear05 1.57%
10 Years rr_AverageAnnualReturnYear10 2.99%
Advisor Class Shares | T. Rowe Price Blue Chip Growth Fund, Inc. | Returns after taxes on distributions and sale of fund shares | T. Rowe Price Blue Chip Growth Fund-Advisor Class
  
Average Annual Return: rr_AverageAnnualReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 0.82%
5 Years rr_AverageAnnualReturnYear05 1.35%
10 Years rr_AverageAnnualReturnYear10 2.60%
Advisor Class Shares | T. Rowe Price Blue Chip Growth Fund, Inc. | S&P 500 Index
  
Average Annual Return: rr_AverageAnnualReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 2.11%
5 Years rr_AverageAnnualReturnYear05 (0.25%)
10 Years rr_AverageAnnualReturnYear10 2.92%
Advisor Class Shares | T. Rowe Price Blue Chip Growth Fund, Inc. | Lipper Large-Cap Growth Funds Index
  
Average Annual Return: rr_AverageAnnualReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 (2.90%)
5 Years rr_AverageAnnualReturnYear05 0.85%
10 Years rr_AverageAnnualReturnYear10 1.43%
R Class Shares | T. Rowe Price Blue Chip Growth Fund, Inc.
  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading

Blue Chip Growth Fund–R Class

SUMMARY
Objective [Heading] rr_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The fund seeks to provide long-term capital growth.
Objective, Secondary [Text Block] rr_ObjectiveSecondaryTextBlock Income is a secondary objective.
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.
Operating Expenses: rr_OperatingExpensesAbstract  
Operating Expenses Caption [Text] rr_OperatingExpensesCaption

Fees and Expenses of the Fund’s R Class

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 44.2% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 44.20%
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 the common stocks of large and medium-sized blue chip growth companies. These are firms that, in our view, are well established in their industries and have the potential for above-average earnings growth. We focus on companies with leading market position, seasoned management, and strong financial fundamentals. Our investment approach reflects our belief that solid company fundamentals (with emphasis on strong growth in earnings per share or operating cash flow) combined with a positive industry outlook will ultimately reward investors with strong investment performance. Some of the companies we target should have good prospects for dividend growth.

In pursuing its investment objective, the fund has the discretion to deviate from its normal investment criteria, as previously described, and purchase securities that the fund's management believes will provide an opportunity for substantial appreciation. These situations might arise when the fund's management 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 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.

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 1-800-638-8790
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

Blue Chip Growth Fund- R Class

Calendar Year Returns
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock

Best Quarter 6/30/09 17.29%

Worst Quarter 12/31/08 -24.97%

           
    Quarter   Total  
    Ended   Return  
Best Quarter   6/30/09   17.29%  
Worst Quarter   12/31/08   -24.97%  
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 1-800-638-8790.
R Class Shares | T. Rowe Price Blue Chip Growth Fund, Inc. | T. Rowe Price Blue Chip Growth Fund-R Class
  
Operating Expenses: rr_OperatingExpensesAbstract  
Management fees rr_ManagementFeesOverAssets 0.60%
Distribution and service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.50% [2]
Other expenses rr_OtherExpensesOverAssets 0.18%
Total annual fund operating expenses rr_ExpensesOverAssets 1.28%
Expense Example: rr_ExpenseExampleAbstract  
1 year rr_ExpenseExampleYear01 130
3 years rr_ExpenseExampleYear03 406
5 years rr_ExpenseExampleYear05 702
10 years rr_ExpenseExampleYear10 1,545
Bar Chart Table: rr_BarChartTableAbstract  
03 rr_AnnualReturn2003 29.23%
04 rr_AnnualReturn2004 8.83%
05 rr_AnnualReturn2005 5.47%
06 rr_AnnualReturn2006 9.29%
07 rr_AnnualReturn2007 12.55%
08 rr_AnnualReturn2008 (42.85%)
09 rr_AnnualReturn2009 41.98%
10 rr_AnnualReturn2010 15.88%
11 rr_AnnualReturn2011 0.99%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best Quarter
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2009
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 17.29%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst Quarter
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Dec. 31, 2008
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (24.97%)
Average Annual Return: rr_AverageAnnualReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 0.99%
5 Years rr_AverageAnnualReturnYear05 1.34%
Since inception rr_AverageAnnualReturnSinceInception 6.97%
Inception Date rr_AverageAnnualReturnInceptionDate Sep. 30, 2002
R Class Shares | T. Rowe Price Blue Chip Growth Fund, Inc. | Returns after taxes on distributions | T. Rowe Price Blue Chip Growth Fund-R Class
  
Average Annual Return: rr_AverageAnnualReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 0.99%
5 Years rr_AverageAnnualReturnYear05 1.34%
Since inception rr_AverageAnnualReturnSinceInception 6.96%
Inception Date rr_AverageAnnualReturnInceptionDate Sep. 30, 2002
R Class Shares | T. Rowe Price Blue Chip Growth Fund, Inc. | Returns after taxes on distributions and sale of fund shares | T. Rowe Price Blue Chip Growth Fund-R Class
  
Average Annual Return: rr_AverageAnnualReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 0.64%
5 Years rr_AverageAnnualReturnYear05 1.14%
Since inception rr_AverageAnnualReturnSinceInception 6.14%
Inception Date rr_AverageAnnualReturnInceptionDate Sep. 30, 2002
R Class Shares | T. Rowe Price Blue Chip Growth Fund, Inc. | S&P 500 Index
  
Average Annual Return: rr_AverageAnnualReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 2.11%
5 Years rr_AverageAnnualReturnYear05 (0.25%)
Since inception rr_AverageAnnualReturnSinceInception 6.91%
Inception Date rr_AverageAnnualReturnInceptionDate Sep. 30, 2002
R Class Shares | T. Rowe Price Blue Chip Growth Fund, Inc. | Lipper Large-Cap Growth Funds Index
  
Average Annual Return: rr_AverageAnnualReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 (2.90%)
5 Years rr_AverageAnnualReturnYear05 0.85%
Since inception rr_AverageAnnualReturnSinceInception 5.72%
Inception Date rr_AverageAnnualReturnInceptionDate Sep. 30, 2002
[1] Subject to certain exceptions, accounts with a balance of less than $10,000 are charged an annual $20 fee.
[2] Restated to show maximum 12b-1 fee rate of 0.50%. Actual rate for the prior fiscal year was 0.47 %.