First Trust Bloomberg Space Economy ETF S000106047 [Member] C000276874 [Member] Aerospace And Defense Companies Risk [Member] Artificial Intelligence Companies Risk [Member] Authorized Participant Concentration Risk [Member] Communication Services Companies Risk [Member] Currency Risk [Member] Current Market Conditions Risk [Member] Cyber Security Risk [Member] Depositary Receipts Risk [Member] Emerging Markets Risk [Member] Equity Securities Risk [Member] Index Concentration Risk [Member] Index Or Model Constituent Risk [Member] Index Provider Risk [Member] Industrials Companies Risk [Member] Information Technology Companies Risk [Member] International Closed Market Trading Risk [Member] Large Capitalization Companies Risk [Member] Liquidity Risk [Member] Market Maker Risk [Member] Market Risk [Member] Mid Capitalization Companies Risk [Member] New Fund Risk [Member] Non Correlation Risk [Member] Risk Nondiversified [Member] Non US Securities Risk [Member] Operational Risk [Member] Passive Investment Risk [Member] Premium Discount Risk [Member] Space Economy Companies Risk [Member] Trading Issues Risk [Member] Valuation Risk [Member]