Quarterly report pursuant to Section 13 or 15(d)

Document and Entity Information

Document and Entity Information - shares
9 Months Ended
Oct. 28, 2017
Nov. 27, 2017
Document And Entity Information    
Entity Registrant Name Ulta Beauty, Inc.  
Entity Central Index Key 0001403568  
Document Type 10-Q  
Document Period End Date Oct. 28, 2017  
Amendment Flag false  
Current Fiscal Year End Date --02-03  
Entity Current Reporting Status Yes  
Entity Filer Category Large Accelerated Filer  
Entity Common Stock, Shares Outstanding   60,992,388
Document Fiscal Year Focus 2017  
Document Fiscal Period Focus Q3