v3.19.1
Document and Entity Information
12 Months Ended
Dec. 31, 2018
shares
Document Information [Line Items]  
Document Type 20-F
Amendment Flag false
Document Period End Date Dec. 31, 2018
Document Fiscal Year Focus 2018
Document Fiscal Period Focus FY
Trading Symbol ARCE
Entity Registrant Name ARCO PLATFORM LTD.
Entity Central Index Key 0001740594
Current Fiscal Year End Date --12-31
Entity Well-known Seasoned Issuer No
Entity Current Reporting Status Yes
Entity Filer Category Non-accelerated Filer
Entity Emerging Growth Company true
Entity Ex Transition Period false
Entity Shell Company false
Entity Voluntary Filers No
Entity Common Stock, Shares Outstanding 50,261,027
Class A [member]  
Document Information [Line Items]  
Entity Common Stock, Shares Outstanding 22,602,737
Class B [member]  
Document Information [Line Items]  
Entity Common Stock, Shares Outstanding 27,658,290