v2.4.0.8
Document and Entity Information
9 Months Ended
Sep. 30, 2015
Entity Information [Line Items]  
Document Type 10-Q
Amendment Flag false
Document Period End Date Sep. 30, 2015
Document Fiscal Year Focus 2015
Document Fiscal Period Focus Q3
Trading Symbol UA
Entity Registrant Name UNDER ARMOUR, INC.
Entity Central Index Key 0001336917
Current Fiscal Year End Date --12-31
Entity Filer Category Large Accelerated Filer
Class A Common Stock [Member]
 
Entity Information [Line Items]  
Entity Common Stock, Shares Outstanding 180,115,884
Class B Convertible Common Stock [Member]
 
Entity Information [Line Items]  
Entity Common Stock, Shares Outstanding 35,700,000
Common Class C [Member]
 
Entity Information [Line Items]  
Entity Common Stock, Shares Outstanding 0