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Risk/Return: rr_RiskReturnAbstract  
Registrant Name dei_EntityRegistrantName T. Rowe Price Communications & Technology Fund, Inc.
Prospectus Date rr_ProspectusDate May 01, 2019
T. Rowe Price Communications & Technology Fund  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading T. ROWE PRICE<br/><br/> Communications & Technology Fund<br/><br/> Investor Class<br/><br/> I Class<br/><br/>SUMMARY
Objective [Heading] rr_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The fund seeks to provide long-term capital growth.
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<br/><br/><b>Shareholder fees (fees paid directly from your investment)</b>
Operating Expenses Caption [Text] rr_OperatingExpensesCaption <b>Annual fund operating expenses<br/>(expenses that you pay each year as a<br/>percentage of the value of your investment)</b>
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 6.9% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 6.90%
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<br/><br/>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 securities of communications and technology companies. These companies can be involved in a variety of industries, including, but not limited to, Internet-related industries such as e-commerce and digital products and services; media, including publishing, advertising, broadcasting, and cable and satellite TV; movies and entertainment; telecommunication and wireless telecommunication services; computer hardware, software, and networking services; and components and equipment.

Stock selection is based on fundamental, bottom-up analysis that seeks to identify companies with good appreciation prospects. The portfolio manager may use both growth and value approaches to stock selection. When assessing opportunities among growth-oriented stocks, the portfolio manager generally seeks to identify companies with capable management, attractive business niches, sound financial and accounting practices, and a demonstrated ability to increase revenues, earnings, and cash flow consistently. In looking for value stocks, the portfolio manager will seek companies whose current stock prices appear undervalued in terms of earnings, projected cash flow, or asset value per share, and with growth potential temporarily unrecognized by the market. The portfolio manager also seeks to invest in companies whose stock prices may be temporarily depressed.

The fund is “nondiversified,” meaning it may invest a greater portion of its assets in fewer issuers than is permissible for a “diversified” fund.

In pursuing its investment objective, the fund has the discretion to deviate from its normal investment criteria. These situations might arise when the 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.

The fund’s portfolio may hold stocks of either U.S. or non-U.S. companies, and may at times consist of a relatively small number of holdings. Although the fund typically invests a greater portion of its assets in U.S. stocks than international stocks, there is no limit on the fund’s investments in international securities.

The fund may sell securities for a variety of reasons, such as to secure gains, limit losses, or redeploy assets into more promising opportunities.
Strategy Portfolio Concentration [Text] rr_StrategyPortfolioConcentration The fund will normally invest at least 80% of its net assets (including any borrowings for investment purposes) in securities of communications and technology companies. These companies can be involved in a variety of industries, including, but not limited to, Internet-related industries such as e-commerce and digital products and services; media, including publishing, advertising, broadcasting, and cable and satellite TV; movies and entertainment; telecommunication and wireless telecommunication services; computer hardware, software, and networking services; and components and equipment.
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 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 stock investing Common 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 stock market or because of factors that affect a particular company or industry. In addition, the relatively small number of holdings in which the fund invests could cause it to be more volatile than comparable funds with a more diversified portfolio.

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.

Private placement/IPO risks Any investments in the stocks of privately held companies and newly public companies involve greater risks than investments in stocks of companies that have traded publicly on an exchange for extended time periods. There is significantly less information available about these companies’ business models, quality of management, earnings growth potential, and other criteria that are normally considered when evaluating the investment prospects of a company. Private placements and other restricted securities held by the fund may be considered to be illiquid and are difficult to value since there are no market prices and less overall financial information available. The adviser evaluates a variety of factors when assigning a value to these holdings, but the determination involves some degree of subjectivity and the value assigned for the fund may differ from the value assigned by other mutual funds holding the same security.

Industry risks A fund that focuses its investments in specific industries or sectors is more susceptible to developments affecting those industries and sectors than a more broadly diversified fund. Because the fund invests significantly in communications and technology companies, the fund may perform poorly during a downturn in those industries. Communications and technology companies can be adversely affected by, among other things, changes in government regulation; intense competition; dependency on patent protection; and rapid obsolescence of products and services due to product compatibility, technological innovations, or changing consumer preferences.

International investing risks Investing in the securities of non-U.S. issuers involves special risks not typically associated with investing in U.S. issuers. International securities tend to be more volatile and have lower overall liquidity than investments in U.S. securities and may lose value because of adverse local, political, social, or economic developments overseas, or due to changes in the exchange rates between foreign currencies and the U.S. dollar. In addition, international investments are subject to settlement practices and regulatory and financial reporting standards that differ from those of the U.S.

Nondiversification risks As a nondiversified fund, the fund has the ability to invest a larger percentage of its assets in the securities of a smaller number of issuers than a diversified fund. As a result, poor performance by a single issuer could adversely affect fund performance more than if the fund were invested in a larger number of issuers. The fund’s share price can be expected to fluctuate more than that of a comparable diversified fund.
Risk Lose Money [Text] rr_RiskLoseMoney The fund’s share price fluctuates, which means you could lose money by investing in the fund.
Risk Nondiversified Status [Text] rr_RiskNondiversifiedStatus Nondiversification risks As a nondiversified fund, the fund has the ability to invest a larger percentage of its assets in the securities of a smaller number of issuers than a diversified fund. As a result, poor performance by a single issuer could adversely affect fund performance more than if the fund were invested in a larger number of issuers. The fund’s share price can be expected to fluctuate more than that of a comparable diversified 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.<br/><br/>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.<br/><br/>The following table shows the average annual total returns for each class of the fund that has been in operation for at least one full calendar year, and also compares the returns with the returns of a relevant broad-based market index, as well as with the returns of one or more comparative indexes that have investment characteristics similar to those of the fund, if applicable.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress <b>troweprice.com</b>
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 <b>COMMUNICATIONS & TECHNOLOGY FUND<br/>Calendar Year Returns</b>
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
  Quarter Ended    Total Return  Quarter Ended     Total Return
Best Quarter             6/30/09             25.38%      Worst Quarter            9/30/11            -13.80%
Performance Table Heading rr_PerformanceTableHeading <b>Average Annual Total Returns<br/><br/>Periods ended<br/>December 31, 2018</b>
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold their fund shares through tax-deferred arrangements, such as a 401(k) account or an IRA.
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown After-tax returns are shown only for the Investor Class and will differ for other share classes.
Performance Table Narrative rr_PerformanceTableNarrativeTextBlock The following table shows the average annual total returns for each class of the fund that has been in operation for at least one full calendar year, and also compares the returns with the returns of a relevant broad-based market index, as well as with the returns of one or more comparative indexes that have investment characteristics similar to those of the fund, if applicable.

In addition, the table shows hypothetical after-tax returns to demonstrate how taxes paid by a shareholder may influence returns. After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold their fund shares through tax-deferred arrangements, such as a 401(k) account or an IRA. After-tax returns are shown only for the Investor Class and will differ for other share classes.
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock Updated performance information is available through troweprice.com.
T. Rowe Price Communications & Technology 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 0.14%
Total annual fund operating expenses rr_ExpensesOverAssets 0.78%
1 year rr_ExpenseExampleYear01 $ 80
3 years rr_ExpenseExampleYear03 249
5 years rr_ExpenseExampleYear05 433
10 years rr_ExpenseExampleYear10 $ 966
2009 rr_AnnualReturn2009 68.52%
2010 rr_AnnualReturn2010 26.79%
2011 rr_AnnualReturn2011 (0.03%)
2012 rr_AnnualReturn2012 22.69%
2013 rr_AnnualReturn2013 40.78%
2014 rr_AnnualReturn2014 4.14%
2015 rr_AnnualReturn2015 12.00%
2016 rr_AnnualReturn2016 7.49%
2017 rr_AnnualReturn2017 32.99%
2018 rr_AnnualReturn2018 (1.83%)
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel <b>Best Quarter</b>
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2009
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 25.38%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel <b>Worst Quarter</b>
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Sep. 30, 2011
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (13.80%)
1 Year rr_AverageAnnualReturnYear01 (1.83%)
5 Years rr_AverageAnnualReturnYear05 10.36%
10 Years rr_AverageAnnualReturnYear10 19.70%
Since inception rr_AverageAnnualReturnSinceInception
Inception date rr_AverageAnnualReturnInceptionDate Oct. 13, 1993
T. Rowe Price Communications & Technology 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 (1.71%)
5 Years rr_AverageAnnualReturnYear05
10 Years rr_AverageAnnualReturnYear10
Since inception rr_AverageAnnualReturnSinceInception 14.42%
Inception date rr_AverageAnnualReturnInceptionDate Mar. 23, 2016
T. Rowe Price Communications & Technology Fund | Returns after taxes on distributions | Investor Class  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 (2.11%)
5 Years rr_AverageAnnualReturnYear05 9.34%
10 Years rr_AverageAnnualReturnYear10 18.54%
Since inception rr_AverageAnnualReturnSinceInception
Inception date rr_AverageAnnualReturnInceptionDate Oct. 13, 1993
T. Rowe Price Communications & Technology Fund | Returns after taxes on distributions and sale of fund shares | Investor Class  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 (0.86%)
5 Years rr_AverageAnnualReturnYear05 7.99%
10 Years rr_AverageAnnualReturnYear10 16.69%
Since inception rr_AverageAnnualReturnSinceInception
Inception date rr_AverageAnnualReturnInceptionDate Oct. 13, 1993
T. Rowe Price Communications & Technology Fund | S&P 500 Index (reflects no deduction for fees, expenses, or taxes)  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 (4.38%)
5 Years rr_AverageAnnualReturnYear05 8.49%
10 Years rr_AverageAnnualReturnYear10 13.12%
Since inception rr_AverageAnnualReturnSinceInception 9.97% [2]
Inception date rr_AverageAnnualReturnInceptionDate Mar. 23, 2016
T. Rowe Price Communications & Technology Fund | Lipper Telecommunication Funds Index  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 (7.37%)
5 Years rr_AverageAnnualReturnYear05 4.11%
10 Years rr_AverageAnnualReturnYear10 11.61%
Since inception rr_AverageAnnualReturnSinceInception 5.67% [2]
Inception date rr_AverageAnnualReturnInceptionDate Mar. 23, 2016
[1] Subject to certain exceptions, accounts with a balance of less than $10,000 are charged an annual $20 fee.
[2] Return since 3/23/16.