Annual report pursuant to Section 13 and 15(d)

Document and Entity Information

Document and Entity Information (USD $)
12 Months Ended
Jan. 31, 2015
Mar. 26, 2015
Aug. 02, 2014
Document And Entity Information [Abstract]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Jan. 31, 2015    
Document Fiscal Year Focus 2015    
Document Fiscal Period Focus FY    
Trading Symbol ULTA    
Entity Registrant Name Ulta Salon, Cosmetics & Fragrance, Inc.    
Entity Central Index Key 0001403568    
Current Fiscal Year End Date --01-31    
Entity Well-known Seasoned Issuer Yes    
Entity Current Reporting Status Yes    
Entity Voluntary Filers No    
Entity Filer Category Large Accelerated Filer    
Entity Common Stock, Shares Outstanding   64,230,316dei_EntityCommonStockSharesOutstanding  
Entity Public Float     $ 4,117,508,000dei_EntityPublicFloat