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Label Element Value
Prospectus [Line Items] rr_ProspectusLineItems  
Document Type dei_DocumentType 497
Document Period End Date dei_DocumentPeriodEndDate Jul. 31, 2019
Entity Registrant Name dei_EntityRegistrantName TrimTabs ETF Trust
Entity Central Index Key dei_EntityCentralIndexKey 0001604813
Amendment Flag dei_AmendmentFlag false
Document Creation Date dei_DocumentCreationDate May 29, 2020
Document Effective Date dei_DocumentEffectiveDate May 29, 2020
Prospectus Date rr_ProspectusDate Nov. 29, 2019
Entity Inv Company Type dei_EntityInvCompanyType N-1A
Supplement to Prospectus [Text Block] rr_SupplementToProspectusTextBlock
SUPPLEMENT DATED MAY 29, 2020
TO THE PROSPECTUS DATED NOVEMBER 29, 2019
OF
TRIMTABS ALL CAP INTERNATIONAL FREE-CASH-FLOW ETF (TTAI)
TRIMTABS ALL CAP U.S. FREE-CASH-FLOW ETF (TTAC)
(each a series of TrimTabs ETF Trust)

The following replaces the information appearing under the heading “Decile Rankings of Index Stocks” on page 2 and page 9 of the prospectus in the section titled “Principal Investment Strategies”:
Supplement Closing [Text Block] ck0001604813_SupplementClosingTextBlock
Please keep this supplement with your prospectus for future reference.
TrimTabs All Cap International Free-Cash-Flow ETF  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading TRIMTABS ALL CAP INTERNATIONAL FREE-CASH-FLOW ETF
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
Decile Rankings of Index Stocks.
The Adviser employs a quantamental process using proprietary quantitative models to generate decile rankings (i.e., top 10%, top 20%, top 30%, etc.) for stocks included in the Index, which is based on the following criteria:
 
(1) Strong Free Cash Flow: based on proprietary measures of Free Cash Flow profitability and growth (Free Cash Flow (FCF) represents the cash that a company is able to generate after accounting for capital expenditures);
 
(2) High-Quality Balance Sheet: based on proprietary measures of quality, leverage and underlying trends;
 
(3) Actual Share Reduction: based on the relative decrease and trend in their outstanding shares over different periods in real-time.
 
The top decile of stocks ranked represent the companies with (1) the strongest proprietary Free Cash Flow rankings, (2) strongest proprietary balance sheet rankings, and (3) the largest share reduction rankings, respectively, based on the Adviser’s sequential layering process.
TrimTabs All Cap International Free-Cash-Flow ETF | TrimTabs All Cap International Free-Cash-Flow ETF  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol TTAI
TrimTabs All Cap U.S. Free-Cash-Flow ETF  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading TRIMTABS ALL CAP U.S. FREE-CASH-FLOW ETF
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
Decile Rankings of Index Stocks.
The Adviser employs a quantamental process using proprietary quantitative models to generate decile rankings (i.e., top 10%, top 20%, top 30%, etc.) for stocks included in the Index, which is based on the following criteria:
 
(1) Strong Free Cash Flow: based on proprietary measures of Free Cash Flow profitability and growth (Free Cash Flow (FCF) represents the cash that a company is able to generate after accounting for capital expenditures);
 
(2) High-Quality Balance Sheet: based on proprietary measures of quality, leverage and underlying trends;
 
(3) Actual Share Reduction: based on the relative decrease and trend in their outstanding shares over different periods in real-time.
 
The top decile of stocks ranked represent the companies with (1) the strongest proprietary Free Cash Flow rankings, (2) strongest proprietary balance sheet rankings, and (3) the largest share reduction rankings, respectively, based on the Adviser’s sequential layering process.
TrimTabs All Cap U.S. Free-Cash-Flow ETF | TrimTabs All Cap U.S. Free-Cash-Flow ETF  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol TTAC