v3.19.1
Document and Entity Information - USD ($)
12 Months Ended
Feb. 02, 2019
Mar. 26, 2019
Aug. 04, 2018
Document Information [Line Items]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Feb. 02, 2019    
Document Fiscal Year Focus 2018    
Document Fiscal Period Focus FY    
Trading Symbol TLYS    
Entity Registrant Name TILLY'S, INC.    
Entity Central Index Key 0001524025    
Current Fiscal Year End Date --02-02    
Entity Well-known Seasoned Issuer No    
Entity Current Reporting Status Yes    
Entity Voluntary Filers No    
Entity Filer Category Accelerated Filer    
Entity Public Float     $ 227,376,751
Class A Common Stock      
Document Information [Line Items]      
Entity Common Stock, Shares Outstanding   21,757,948  
Class B Common Stock      
Document Information [Line Items]      
Entity Common Stock, Shares Outstanding   7,746,108