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Label Element Value
Pacer Swan SOS Conservative (October) ETF  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading Pacer Swan SOS Conservative (October) ETF
Supplement to Prospectus [Text Block] rr_SupplementToProspectusTextBlock
Pacer Swan SOS Conservative (October) ETF (PSCQ)
(the “Fund”)

Supplement dated October 1, 2021 to the
Prospectus dated December 23, 2020, as previously supplemented
Objective [Heading] rr_ObjectiveHeading Effective immediately, the Fund’s “Investment Objective” in the Summary Section of the Prospectus is deleted and replaced with the following:
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The Pacer Swan SOS Conservative (October) ETF (the “Fund”) seeks to provide investors with returns that, before fees and expenses of the Fund, match those of the SPDR® S&P 500® ETF Trust (the “Underlying ETF”) up to a predetermined upside cap of 7.56% (before fees and expenses of the Fund) and 6.81% (after fees and expenses of the Fund), while providing a buffer against Underlying ETF losses between 5% and 30% over the period from October 1, 2021 to September 30, 2022.
Strategy [Heading] rr_StrategyHeading Effective immediately, the following table replaces the table located in “Principal Investment Strategies of the Fund” in the Fund’s Summary Section of the Prospectus:
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
Investment
Period Start		Investment
Period End		BufferCap (before Fund
fees and expenses)		Cap (after Fund
fees and expenses)
October 1, 2021September 30, 20225% to 30%7.56%6.81%
Supplement Closing [Text Block] ck0001616668_SupplementClosingTextBlock Please retain this Supplement with your Prospectus for future reference.
Pacer Swan SOS Conservative (October) ETF | Pacer Swan SOS Conservative (October) ETF  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PSCQ
Pacer Swan SOS Moderate (October) ETF  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading Pacer Swan SOS Moderate (October) ETF
Supplement to Prospectus [Text Block] rr_SupplementToProspectusTextBlock
Pacer Swan SOS Moderate (October) ETF (PSMO)
(the “Fund”)

Supplement dated October 1, 2021 to the
Prospectus dated December 23, 2020, as previously supplemented
Objective [Heading] rr_ObjectiveHeading Effective immediately, the Fund’s “Investment Objective” in the Summary Section of the Prospectus is deleted and replaced with the following:
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The Pacer Swan SOS Moderate (October) ETF (the “Fund”) seeks to provide investors with returns that, before fees and expenses of the Fund, match those of the SPDR® S&P 500® ETF Trust (“the Underlying ETF”) up to a predetermined upside cap of 9.07% (before fees and expenses of the Fund) and 8.32% (after fees and expenses of the Fund), while providing a buffer against the first 15% of Underlying ETF losses, over the period from October 1, 2021 to September 30, 2022.
Strategy [Heading] rr_StrategyHeading Effective immediately, the following table replaces the table located in “Principal Investment Strategies of the Fund” in the Fund’s Summary Section of the Prospectus:
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
Investment
Period Start		Investment
Period End		BufferCap (before Fund
fees and expenses)		Cap (after Fund
fees and expenses)
October 1, 2021September 30, 202215%9.07%8.32%
Supplement Closing [Text Block] ck0001616668_SupplementClosingTextBlock Please retain this Supplement with your Prospectus for future reference.
Pacer Swan SOS Moderate (October) ETF | Pacer Swan SOS Moderate (October) ETF  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PSMO
Pacer Swan SOS Flex (October) ETF  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading Pacer Swan SOS Flex (October) ETF
Supplement to Prospectus [Text Block] rr_SupplementToProspectusTextBlock
Pacer Swan SOS Flex (October) ETF (PSFO)
(the “Fund”)

Supplement dated October 1, 2021 to the
Prospectus dated December 23, 2020, as previously supplemented
Objective [Heading] rr_ObjectiveHeading Effective immediately, the Fund’s “Investment Objective” in the Summary Section of the Prospectus is deleted and replaced with the following:
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The Pacer Swan SOS Flex (October) ETF (the “Fund”) seeks to provide investors with returns that match those of the SPDR® S&P 500® ETF Trust (the “Underlying ETF”) up to a predetermined upside cap of 12.98% (before fees and expenses of the Fund) and 12.23% (after fees and expenses of the Fund), while providing a buffer against the first 20% of Underlying ETF losses with the benefits of such buffer declining from 20% to 0% for Underlying ETF losses between 20% and 40%, over the period from October 1, 2021 to September 30, 2022.
Strategy [Heading] rr_StrategyHeading Effective immediately, the following table replaces the table located in “Principal Investment Strategies of the Fund” in the Fund’s Summary Section of the Prospectus:
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
Investment
Period Start		Investment
Period End		Full
Buffer		Fading
Buffer		Cap (before Fund
fees and expenses)		Cap (after Fund
fees and expenses)
October 1, 2021September 30, 202220%20% to 40%12.98%12.23%
Supplement Closing [Text Block] ck0001616668_SupplementClosingTextBlock Please retain this Supplement with your Prospectus for future reference.
Pacer Swan SOS Flex (October) ETF | Pacer Swan SOS Flex (October) ETF  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PSFO