Quarterly report pursuant to Section 13 or 15(d)

Document and Entity Information

Document and Entity Information - shares
9 Months Ended
Oct. 31, 2020
Nov. 30, 2020
Cover [Abstract]    
Entity Registrant Name Ulta Beauty, Inc.  
Document Quarterly Report true  
Document Transition Report false  
Entity Central Index Key 0001403568  
Document Type 10-Q  
Document Period End Date Oct. 31, 2020  
Amendment Flag false  
Current Fiscal Year End Date --01-30  
Entity File Number 001-33764  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 38-4022268  
Entity Address, Address Line One 1000 Remington Blvd.  
Entity Address, Address Line Two Suite 120  
Entity Address, City or Town Bolingbrook  
Entity Address, State or Province IL  
Entity Address, Postal Zip Code 60440  
City Area Code 630  
Local Phone Number 410-4800  
Title of 12(b) Security Common Stock  
Security Exchange Name NASDAQ  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Large Accelerated Filer  
Entity Common Stock, Shares Outstanding   56,338,639
Entity Small Business false  
Entity Emerging Growth Company false  
Entity Shell Company false  
Document Fiscal Year Focus 2020  
Document Fiscal Period Focus Q3  
Trading Symbol ULTA