v3.10.0.1
Document and Entity Information - shares
9 Months Ended
Nov. 03, 2018
Nov. 30, 2018
Document Information [Line Items]    
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Nov. 03, 2018  
Document Fiscal Year Focus 2018  
Document Fiscal Period Focus Q3  
Trading Symbol TLYS  
Entity Registrant Name TILLY'S, INC.  
Entity Central Index Key 0001524025  
Current Fiscal Year End Date --02-02  
Entity Filer Category Accelerated Filer  
Class A common stock    
Document Information [Line Items]    
Entity Common Stock, Shares Outstanding   21,536,199
Common Stock (Class B)    
Document Information [Line Items]    
Entity Common Stock, Shares Outstanding   7,944,108