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First Trust Nasdaq Semiconductor ETF Annual Total Returns
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
First Trust Nasdaq Semiconductor ETF | First Trust Nasdaq Semiconductor ETF                
Prospectus [Line Items]                
Annual Return [Percent] 7.66% 54.27% (33.52%) 35.07% 46.25% 61.34% (13.50%) 31.86%