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Label Element Value
Prospectus [Line Items] rr_ProspectusLineItems  
Document Type dei_DocumentType 497
Document Period End Date dei_DocumentPeriodEndDate Sep. 30, 2024
Entity Registrant Name dei_EntityRegistrantName First Trust Exchange-Traded Fund II
Entity Central Index Key dei_EntityCentralIndexKey 0001364608
Entity Inv Company Type dei_EntityInvCompanyType N-1A
Amendment Flag dei_AmendmentFlag false
Document Creation Date dei_DocumentCreationDate Apr. 22, 2025
Document Effective Date dei_DocumentEffectiveDate Apr. 22, 2025
First Trust Indxx Metaverse ETF  
Prospectus [Line Items] rr_ProspectusLineItems  
Supplement to Prospectus [Text Block] rr_SupplementToProspectusTextBlock

 

1.Notwithstanding anything to the contrary in the Fund’s prospectus, effective as of the date set forth above, the final paragraph of the section entitled “Principal Investment Strategies” is hereby deleted in its entirety.
2.Notwithstanding anything to the contrary in the Fund’s prospectus, effective as of the date set forth above, the risk factor “Non-Diversification Risk” set forth in the section entitled “Principal Risks” is hereby deleted in its entirety.