Document and Entity Information - shares
3 Months Ended
Apr. 29, 2018
May 28, 2018
Document Document And Entity Information [Abstract]    
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Apr. 29, 2018  
Document Fiscal Year Focus 2018  
Document Fiscal Period Focus Q1  
Trading Symbol LULU  
Entity Registrant Name lululemon athletica inc.  
Entity Central Index Key 0001397187  
Current Fiscal Year End Date --02-03  
Entity Filer Category Large Accelerated Filer  
Entity Common Stock, Shares Outstanding   125,914,467