Document and Entity Information - shares
6 Months Ended
Jul. 30, 2017
Aug. 28, 2017
Document Document And Entity Information [Abstract]    
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Jul. 30, 2017  
Document Fiscal Year Focus 2017  
Document Fiscal Period Focus Q2  
Trading Symbol LULU  
Entity Registrant Name lululemon athletica inc.  
Entity Central Index Key 0001397187  
Current Fiscal Year End Date --01-28  
Entity Filer Category Large Accelerated Filer  
Entity Common Stock, Shares Outstanding   125,601,122