v3.25.2
First Trust Indxx Medical Devices ETF Investment Objectives and Goals - First Trust Indxx Medical Devices ETF
Mar. 31, 2025
Prospectus [Line Items]  
Risk/Return [Heading] <span style="font-family:Arial;font-size:12.60pt;font-weight:bold;">First Trust Indxx Medical Devices ETF (MDEV)</span>
Objective [Heading] <span style="color:#000000;font-family:Arial;font-size:9.90pt;font-weight:bold;">Investment Objective</span>
Objective, Primary [Text Block] The First Trust Indxx Medical Devices ETF (the “Fund”) seeks investment results that correspond generally to the price and yield (before the Fund’s fees and expenses) of an index called the Indxx Medical Devices Index (the “Index”).