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Label Element Value
Written Communications dei_WrittenCommunications false
Document Period End Date dei_DocumentPeriodEndDate Aug. 03, 2021
Local Phone Number dei_LocalPhoneNumber 454-6428
City Area Code dei_CityAreaCode 410
Amendment Flag dei_AmendmentFlag false
Pre-commencement Tender Offer dei_PreCommencementTenderOffer false
Entity Emerging Growth Company dei_EntityEmergingGrowthCompany false
Entity Central Index Key dei_EntityCentralIndexKey 0001336917
Entity Incorporation, State or Country Code dei_EntityIncorporationStateCountryCode MD
Entity Tax Identification Number dei_EntityTaxIdentificationNumber 52-1990078
Entity Address, City or Town dei_EntityAddressCityOrTown Baltimore
Entity Address, Address Line One dei_EntityAddressAddressLine1 1020 Hull Street
Entity Address, State or Province dei_EntityAddressStateOrProvince MD
Entity Registrant Name dei_EntityRegistrantName UNDER ARMOUR, INC.
Soliciting Material dei_SolicitingMaterial false
Pre-commencement Issuer Tender Offer dei_PreCommencementIssuerTenderOffer false
Document Type dei_DocumentType 8-K
Entity File Number dei_EntityFileNumber 001-33202
Entity Address, Postal Zip Code dei_EntityAddressPostalZipCode 21230