Quarterly report pursuant to Section 13 or 15(d)

Document and Entity Information

Document and Entity Information - shares
6 Months Ended
Aug. 04, 2018
Aug. 28, 2018
Document And Entity Information    
Entity Registrant Name Ulta Beauty, Inc.  
Entity Central Index Key 0001403568  
Document Type 10-Q  
Document Period End Date Aug. 04, 2018  
Amendment Flag false  
Current Fiscal Year End Date --02-02  
Entity Current Reporting Status Yes  
Entity Filer Category Large Accelerated Filer  
Entity Common Stock, Shares Outstanding   59,770,399
Document Fiscal Year Focus 2018  
Document Fiscal Period Focus Q2  
Trading Symbol ULTA