• Entity registrant name: GERDAU S.A. (CIK: 0001073404)
  • SEC filing page: http://www.sec.gov/Archives/edgar/data/1073404/000110465918022121/0001104659-18-022121-index.htm
  • XBRL Instance: http://www.sec.gov/Archives/edgar/data/1073404/000110465918022121/ggb-20171231.xml
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  • EDGAR Dashboard: https://edgardashboard.xbrlcloud.com/edgar-dashboard/?cik=0001073404
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    Component: (Network and Table)
    Network
    00090 - Document - Document and Entity Information
    (http://www.gerdau.com/role/DocumentDocumentAndEntityInformation)
    Table (Implied)
    Slicers (applies to each fact value in each table cell)
    Reporting Entity [Axis] 0001073404 (http://www.sec.gov/CIK)
    Document and Entity Information [Abstract] Period [Axis]
    2017-01-01 - 2017-12-31
    Document and Entity Information [Abstract]
     
    Entity Registrant Name
    GERDAU S.A.  
    Entity Central Index Key
    0001073404  
    Document Type
    20-F  
    Document Period End Date
    2017-12-31  
    Amendment Flag
    false  
    Current Fiscal Year End Date
    --12-31  
    Entity Well-known Seasoned Issuer
    Yes  
    Entity Voluntary Filers
    No  
    Entity Current Reporting Status
    Yes  
    Entity Filer Category
    Large Accelerated Filer  
    Entity Common Stock, Shares Outstanding
    573,627,483  
    Document Fiscal Year Focus
    2017  
    Document Fiscal Period Focus
    FY