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Pacer Trendpilot® US Large Cap ETF  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading Pacer Trendpilot® US Large Cap ETF
Objective [Heading] rr_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock

The Pacer Trendpilot US Large Cap ETF (the “Fund”) is an exchange traded fund that seeks to track the total return performance, before fees and expenses, of the Pacer Trendpilot US Large Cap Index (the “Index”).
Expense [Heading] rr_ExpenseHeading Fees and Expenses of the Fund
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock

The following table describes the fees and expenses you may pay if you buy and hold shares of the Fund. The fees are expressed as a percentage of the Fund’s average net assets. This table and the Example below do not include the brokerage commissions that investors may pay on their purchases and sales of Fund shares.
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. For the fiscal year ended April 30, 2018, the Fund’s portfolio turnover rate was 12% of the average value of its portfolio .
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 12.00%
Expense Exchange Traded Fund Commissions [Text] rr_ExpenseExchangeTradedFundCommissions This table and the Example below do not include the brokerage commissions that investors may pay on their purchases and sales of Fund shares.
Expense Example [Heading] rr_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock

The following example is intended to help retail investors compare the cost of investing in the Fund with the cost of investing in other funds. It illustrates the hypothetical expenses that such investors would incur over various periods if they were to invest $10,000 in the Fund for the time periods indicated and then redeem all of the shares at the end of those periods. This example assumes that the Fund provides a return of 5% a year and that operating expenses remain the same.
Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption Although your actual costs may be higher or lower, based on these assumptions, your costs would be:
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies of the Fund
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock

The Fund employs a “passive management” (or indexing) investment approach designed to track the total return performance, before fees and expenses, of the Index. The Index is based on a proprietary methodology developed and maintained by Index Design Group, an affiliate of Pacer Advisors, Inc., the Fund’s investment adviser (the “Adviser”).


The Index


The Index uses an objective, rules-based methodology to implement a systematic trend-following strategy that directs exposure (i) 100% to the S&P 500® Index (the “S&P 500”), (ii) 50% to the S&P 500 and 50% to 3-Month US Treasury bills, or (iii) 100% to 3-Month US Treasury bills, depending on the relative performance of the S&P 500 Total Return Index (“S&P 500 TR”) and its 200-business day historical simple moving average (the “200-day moving average”). The S&P 500 TR is a total return version of the S&P 500 and reflects the reinvestment of dividends paid by the securities in the S&P 500. The S&P 500 consists of approximately 500 leading U.S.-listed companies representing approximately 80% of the U.S. equity market capitalization.


The Index, and consequently the Fund, may stay in any of its three possible positions for an extended period of time. As described below, the Index will change its position based on the following indicators, and each change will become effective on the second business day after the indicator for the change is triggered.


Equity Indicator. When the S&P 500 TR closes above its 200-day moving average for five consecutive business days (the “Equity Indicator”), the exposure of the Index will be 100% to the S&P 500, effective on the second business following the date of the Equity Indicator.


Once the Equity Indicator has been triggered, the exposure of the Index will next change to either be 50% to the S&P 500 and 50% to 3-Month US Treasury bills if the 50/50 Indicator (described below) is triggered or 100% to 3-Month US Treasury bills if both the 50/50 Indicator and the T-Bill Indicator (described below) are triggered simultaneously, effective on the second business day following the date of the indicator(s).


50/50 Indicator. When the S&P 500 TR closes below its 200-day moving average for five consecutive business days (the “50/50 Indicator”), the exposure of the Index will be 50% to the S&P 500 and 50% to 3-Month US Treasury bills, effective on the second business day following the date of the 50/50 Indicator. Following the effectiveness of the 50/50 Indicator, the exposure of the Index may be greater than or less than 50% with respect to the S&P 500 and 3-Month US Treasury bills depending on their respective performance until either the Equity Indicator or T-Bill Indicator (described below) is triggered.


Once the 50/50 Indicator has been triggered, the exposure of the Index will next change to either be 100% to the S&P 500 if the Equity Indicator is triggered or 100% to 3-Month US Treasury bills if the T-Bill Indicator (described below) is triggered, effective on the second business day following the date of the indicator.


T-Bill Indicator. When the S&P 500 TR’s 200-day moving average closes lower than its value from five business days earlier (the “T-Bill Indicator”), the exposure of the Index will be 100% to 3-Month US Treasury bills, effective on the second business day following the date of the T-Bill Indicator.


For example, if today is Wednesday and the S&P 500 TR’s 200-day moving average closes lower than it did on the fifth preceding business day (Wednesday of the preceding week), the T-Bill Indicator is triggered. Unlike the operation of the Equity Indicator and 50/50 Indicator, the closing values on the days in between today and the fifth preceding business day do not affect whether the T-Bill Indicator has been triggered; rather, the T-Bill Indicator simply compares today’s closing value to the closing value five business days earlier. However, the Index will not move directly from 100% exposure to the S&P 500 to 100% exposure to 3-Month US Treasury bills unless the 50/50 Indicator was simultaneously triggered following the most recent triggering of the Equity Indicator.


Once the T-Bill Indicator has been triggered, the exposure of the Index will next change to be 100% to the S&P 500 if the Equity Indicator is triggered, effective on the second business day following the date of the indicator. Once the T-Bill Indicator has been triggered, the Index will not return to its 50/50 position unless the Equity Indicator is first triggered, followed by the 50/50 Indicator being triggered.


The Index aims to mitigate, to some extent, the volatility of the S&P 500 by tracking 3-Month US Treasury bills (instead of the S&P 500) when the S&P 500 TR is in a negative trend.


The Fund’s Investment Strategy


Under normal circumstances, at least 80% of the Fund’s total assets (exclusive of collateral held from securities lending) will be invested in the component securities of the Index. The Adviser expects that, over time, the correlation between the Fund’s performance and that of the Index, before fees and expenses, will be 95% or better.


The Fund will generally use a “replication” strategy to achieve its investment objective, meaning it will invest in all of the component securities of the Index in the same approximate proportion as in the Index.

Risk [Heading] rr_RiskHeading Principal Risks of Investing in the Fund
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock

You can lose money on your investment in the Fund. The Fund is subject to the risks summarized below. Some or all of these risks may adversely affect the Fund’s net asset value per share (“NAV”), trading price, yield, total return and/or ability to meet its objectives. For more information about the risks of investing in the Fund, see the section in the Fund’s prospectus entitled “Additional Information about the Principal Risks of Investing in the Funds.”


■ Equity Market Risk. The equity securities held in the Fund’s portfolio may experience sudden, unpredictable drops in value or long periods of decline in value. This may occur because of factors that affect securities markets generally or factors affecting specific industries, sectors or companies in which the Fund invests. Common stocks are susceptible to general stock market fluctuations and to volatile increases and decreases in value as market confidence in and perceptions of their issuers change.
   
■ Fixed Income Risk. The value of the Fund’s direct or indirect investments in fixed income securities will fluctuate with changes in interest rates. Typically, a rise in interest rates causes a decline in the value of fixed income securities owned by the Fund. On the other hand, if rates fall, the value of the fixed income securities generally increases. The Fund may be subject to a greater risk of rising interest rates due to the current period of historically low rates and the effect of potential government fiscal policy initiatives and resulting market reaction to those initiatives. In general, the market price of fixed income securities with longer maturities will increase or decrease more in response to changes in interest rates than shorter-term securities. The value of the Fund’s direct or indirect investments in fixed income securities may be affected by the inability of issuers to repay principal and interest or illiquidity in debt securities markets.
   
■ Government Obligations Risk. The Fund may invest in securities issued by the U.S. government. There can be no guarantee that the United States will be able to meet its payment obligations with respect to such securities. Additionally, market prices and yields of securities supported by the full faith and credit of the U.S. government may decline or be negative for short or long periods of time.
   
■ High Portfolio Turnover Risk. At times, the Fund may have a portfolio turnover rate substantially greater than 100%. A high portfolio turnover rate would result in correspondingly greater transaction expenses, including brokerage commissions, dealer mark ups and other transaction costs, on the sale of securities and on reinvestment in other securities and may result in reduced performance and the distribution to shareholders of additional capital gains for tax purposes. These factors may negatively affect the Fund’s performance.
   
■ Large-Capitalization Investing Risk. The Fund may invest in the securities of large-capitalization companies. As a result, the Fund’s performance may be adversely affected if securities of large-capitalization companies underperform securities of smaller-capitalization companies or the market as a whole. The securities of large-capitalization companies may be relatively mature compared to smaller companies and therefore subject to slower growth during times of economic expansion.
   
■ Other Investment Companies Risk. The Fund will incur higher and duplicative expenses when it invests in other investment companies such as exchange traded funds (“ETFs”). There is also the risk that the Fund may suffer losses due to the investment practices of the underlying funds. When the Fund invests in other investment companies, the Fund will be subject to substantially the same risks as those associated with the direct ownership of securities held by such investment companies. Investments in ETFs are also subject to the following risks: (i) the market price of an ETF’s shares may trade above or below their net asset value; (ii) an active trading market for an ETF’s shares may not develop or be maintained; and (iii) trading of an ETF’s shares may be halted for a number of reasons.
   
■ Passive Investment Risk. The Fund is not actively managed and the Adviser would not sell a security due to current or projected underperformance of a security, industry or sector, unless that security is removed from the Index or the selling of shares of that security is otherwise required upon a reconstitution of the Index in accordance with the Index methodology. The Fund invests in securities included in, the Index, regardless of their investment merits. The Fund does not take defensive positions under any market conditions, including conditions that are adverse to the performance of the Fund.
   
■ Shares of the Fund May Trade at Prices Other Than NAV. As with all ETFs, Fund shares may be bought and sold in the secondary market at market prices. The price of Fund shares, like the price of all traded securities, will be subject to factors such as supply and demand, as well as the current value of the Fund’s portfolio holdings. Although it is expected that the market price of the shares of the Fund will approximate the Fund’s NAV, there may be times when the market price of the shares is more than the NAV intra-day (premium) or less than the NAV intra-day (discount). This risk is heightened in times of market volatility, periods of steep market declines, and periods when there is limited trading activity for shares in the secondary market, in which case such premiums or discounts may be significant.

■ Tracking Risk. The Fund’s return may not track the return of the Index for a number of reasons. For example, the Fund incurs a number of operating expenses not applicable to the Index, and incurs costs in buying and selling securities, especially when rebalancing the Fund’s securities holdings to reflect changes in the composition of the Index. In addition, when the Fund uses a representative sampling approach, the Fund may not be as well correlated with the return of the Index as when the Fund purchases all of the securities in the Index in the proportions in which they are represented in the Index.
   
■ Trend Lag Risk. At least six consecutive trading days will elapse after the S&P 500 TR first drops below its historical 200-day simple moving average (or conversely, first moves above such average) before the Index will switch from tracking the S&P 500 to 3-Month US Treasury bills (or conversely, from 3-Month US Treasury bills to the S&P 500). As a result, if the S&P 500 TR is in an overall positive trend, the Index and consequently the Fund may be adversely affected by a downward trend and/or volatility in the S&P 500 TR for up to six consecutive trading days (or conversely, if the S&P 500 TR is in an overall negative trend, the Index and consequently the Fund may not benefit from an upward trend and/or volatility in the S&P 500 TR for up to six consecutive trading days). Accordingly, the methodology employed by the Index does not eliminate exposure to downward trends and/or volatility in the S&P 500 TR and does not provide immediate exposure to upward trends and/or volatility in the S&P 500 TR.
Risk Lose Money [Text] rr_RiskLoseMoney You can lose money on your investment in the Fund.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Fund Performance
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock

The following information provides some indication of the risks of investing in the Fund. The bar chart shows the Fund’s performance for calendar years ended December 31. The table shows how the Fund’s average annual returns for the one year and since inception periods compare with those of the Index and a broad measure of market performance. The Fund’s past performance, before and after taxes, is not necessarily an indication of how the Fund will perform in the future. Updated performance information is available on the Fund’s website at www.paceretfs.com or by calling the Fund toll-free at 1-877-337-0500 .
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The following information provides some indication of the risks of investing in the Fund.
Performance Availability Phone [Text] rr_PerformanceAvailabilityPhone 1-877-337-0500
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.paceretfs.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 how the Fund will perform in the future.
Bar Chart [Heading] rr_BarChartHeading Calendar Year Total Return as of December 31
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock

For the year-to-date period ended June 30, 2018, the Fund’s total return was 2.35%. During the period of time shown in the bar chart, the Fund’s highest return for a calendar quarter was 6.44% (quarter ended December 31, 2017) and the Fund’s lowest return for a calendar quarter was -5.44% (quarter ended March 31, 2016).

Year to Date Return, Label rr_YearToDateReturnLabel year-to-date period ended
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Jun. 30, 2018
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn 2.35%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel highest return for a calendar quarter
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Dec. 31, 2017
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 6.44%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel lowest return for a calendar quarter
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2016
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (5.44%)
Performance Table Market Index Changed rr_PerformanceTableMarketIndexChanged Effective November 1, 2017, the S&P 500 replaced the Wilshire US Large-Cap as the equity exposure component of the Fund’s Index.
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses, or taxes)
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate After-tax returns are calculated using the historical highest individual federal marginal income tax rates during the period covered by the table above 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 Shares through tax-deferred arrangements such as an individual retirement account (“IRA”) or other tax-advantaged accounts.
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock

After-tax returns are calculated using the historical highest individual federal marginal income tax rates during the period covered by the table above 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 Shares through tax-deferred arrangements such as an individual retirement account (“IRA”) or other tax-advantaged accounts.

Caption rr_AverageAnnualReturnCaption Average Annual Total Returns (for the period ended December 31, 2017)
Pacer Trendpilot® US Large Cap ETF | Pacer Trendpilot US Large Cap Index (reflects no deduction for fees, expenses, or taxes)  
Risk/Return: rr_RiskReturnAbstract  
Label rr_AverageAnnualReturnLabel Pacer Trendpilot US Large Cap Index (reflects no deduction for fees, expenses, or taxes)
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 21.75% [1]
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 7.05% [1]
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Jun. 11, 2015
Pacer Trendpilot® US Large Cap ETF | S&P 500 Index (reflects no deduction for fees, expenses, or taxes)  
Risk/Return: rr_RiskReturnAbstract  
Label rr_AverageAnnualReturnLabel S&P 500 Index (reflects no deduction for fees, expenses, or taxes)
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 21.83% [1]
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 12.06% [1]
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Jun. 11, 2015
Pacer Trendpilot® US Large Cap ETF | Wilshire US Large-Cap Index (reflects no deduction for fees, expenses, or taxes)  
Risk/Return: rr_RiskReturnAbstract  
Label rr_AverageAnnualReturnLabel Wilshire US Large-Cap Index (reflects no deduction for fees, expenses, or taxes)
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 21.84% [1]
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 12.16% [1]
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Jun. 11, 2015
Pacer Trendpilot® US Large Cap ETF | Pacer Trendpilot US Large Cap ETF  
Risk/Return: rr_RiskReturnAbstract  
Management Fees rr_ManagementFeesOverAssets 0.60%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets none
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.60%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 61
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 192
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 335
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 750
Annual Return 2016 rr_AnnualReturn2016 4.57%
Annual Return 2017 rr_AnnualReturn2017 21.01%
Label rr_AverageAnnualReturnLabel Return Before Taxes
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 21.01%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 6.38%
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Jun. 11, 2015
Pacer Trendpilot® US Large Cap ETF | Pacer Trendpilot US Large Cap ETF | After Taxes on Distributions  
Risk/Return: rr_RiskReturnAbstract  
Label rr_AverageAnnualReturnLabel Return After Taxes on Distributions
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 20.73%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 6.14%
Pacer Trendpilot® US Large Cap ETF | Pacer Trendpilot US Large Cap ETF | After Taxes on Distributions and Sale of Fund Shares  
Risk/Return: rr_RiskReturnAbstract  
Label rr_AverageAnnualReturnLabel Return After Taxes on Distributions and Sale of Fund Shares
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 12.12%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 4.89%
[1] Effective November 1, 2017, the S&P 500 replaced the Wilshire US Large-Cap as the equity exposure component of the Fund's Index.